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osrm-backend/third_party/flatbuffers/src/idl_gen_java.cpp
Siarhei Fedartsou 825132eec7
Bump flatbuffers to v24.3.25 version (#6968)
2024-07-10 20:44:36 +02:00

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/*
* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// independent from idl_parser, since this code is not needed for most clients
#include "idl_gen_java.h"
#include "flatbuffers/code_generators.h"
#include "flatbuffers/flatbuffers.h"
#include "flatbuffers/idl.h"
#include "flatbuffers/util.h"
#include "idl_namer.h"
namespace flatbuffers {
namespace java {
namespace {
static Namer::Config JavaDefaultConfig() {
return {
/*types=*/Case::kKeep,
/*constants=*/Case::kScreamingSnake,
/*methods=*/Case::kLowerCamel,
/*functions=*/Case::kLowerCamel,
/*fields=*/Case::kLowerCamel,
/*variables=*/Case::kLowerCamel,
/*variants=*/Case::kKeep,
/*enum_variant_seperator=*/".",
/*escape_keywords=*/Namer::Config::Escape::AfterConvertingCase,
/*namespaces=*/Case::kKeep,
/*namespace_seperator=*/".",
/*object_prefix=*/"",
/*object_suffix=*/"T",
/*keyword_prefix=*/"",
/*keyword_suffix=*/"_",
/*filenames=*/Case::kKeep,
/*directories=*/Case::kKeep,
/*output_path=*/"",
/*filename_suffix=*/"_generated",
/*filename_extension=*/".java",
};
}
static std::set<std::string> JavaKeywords() {
return {
"abstract", "continue", "for", "new", "switch",
"assert", "default", "goto", "package", "synchronized",
"boolean", "do", "if", "private", "this",
"break", "double", "implements", "protected", "throw",
"byte", "else", "import", "public", "throws",
"case", "enum", "instanceof", "return", "transient",
"catch", "extends", "int", "short", "try",
"char", "final", "interface", "static", "void",
"class", "finally", "long", "strictfp", "volatile",
"const", "float", "native", "super", "while",
};
}
static const TypedFloatConstantGenerator JavaFloatGen("Double.", "Float.",
"NaN",
"POSITIVE_INFINITY",
"NEGATIVE_INFINITY");
static const CommentConfig comment_config = {
"/**",
" *",
" */",
};
} // namespace
class JavaGenerator : public BaseGenerator {
struct FieldArrayLength {
std::string name;
int length;
};
public:
JavaGenerator(const Parser &parser, const std::string &path,
const std::string &file_name, const std::string &package_prefix)
: BaseGenerator(parser, path, file_name, "", ".", "java"),
cur_name_space_(nullptr),
namer_(WithFlagOptions(JavaDefaultConfig(), parser.opts, path),
JavaKeywords()) {
if (!package_prefix.empty()) {
std::istringstream iss(package_prefix);
std::string component;
while (std::getline(iss, component, '.')) {
package_prefix_ns_.components.push_back(component);
}
package_prefix_ = package_prefix_ns_.GetFullyQualifiedName("") + ".";
}
}
JavaGenerator &operator=(const JavaGenerator &);
bool generate() {
std::string one_file_code;
cur_name_space_ = parser_.current_namespace_;
for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();
++it) {
std::string enumcode;
auto &enum_def = **it;
if (!parser_.opts.one_file) cur_name_space_ = enum_def.defined_namespace;
GenEnum(enum_def, enumcode);
if (parser_.opts.one_file) {
one_file_code += enumcode;
} else {
if (!SaveType(enum_def.name, *enum_def.defined_namespace, enumcode,
/* needs_includes= */ false))
return false;
}
if (parser_.opts.generate_object_based_api && enum_def.is_union) {
enumcode = "";
GenEnum_ObjectAPI(enum_def, enumcode);
auto class_name = namer_.Type(enum_def) + "Union";
if (parser_.opts.one_file) {
one_file_code += enumcode;
} else {
if (!SaveType(class_name, *enum_def.defined_namespace, enumcode,
/* needs_includes= */ false))
return false;
}
}
}
for (auto it = parser_.structs_.vec.begin();
it != parser_.structs_.vec.end(); ++it) {
std::string declcode;
auto &struct_def = **it;
if (!parser_.opts.one_file)
cur_name_space_ = struct_def.defined_namespace;
GenStruct(struct_def, declcode, parser_.opts);
if (parser_.opts.one_file) {
one_file_code += declcode;
} else {
if (!SaveType(struct_def.name, *struct_def.defined_namespace, declcode,
/* needs_includes= */ true))
return false;
}
if (parser_.opts.generate_object_based_api) {
declcode = "";
GenStruct_ObjectAPI(struct_def, declcode);
auto class_name = namer_.ObjectType(struct_def);
if (parser_.opts.one_file) {
one_file_code += declcode;
} else {
if (!SaveType(class_name, *struct_def.defined_namespace, declcode,
/* needs_includes= */ true))
return false;
}
}
}
if (parser_.opts.one_file) {
return SaveType(file_name_, *parser_.current_namespace_, one_file_code,
/* needs_includes= */ true);
}
return true;
}
// Save out the generated code for a single class while adding
// declaration boilerplate.
bool SaveType(const std::string &defname, const Namespace &ns,
const std::string &classcode, bool needs_includes) const {
if (!classcode.length()) return true;
std::string code;
code = "// " + std::string(FlatBuffersGeneratedWarning()) + "\n\n";
Namespace combined_ns = package_prefix_ns_;
std::copy(ns.components.begin(), ns.components.end(),
std::back_inserter(combined_ns.components));
const std::string namespace_name = FullNamespace(".", combined_ns);
if (!namespace_name.empty()) {
code += "package " + namespace_name + ";";
code += "\n\n";
}
if (needs_includes) {
code +=
"import com.google.flatbuffers.BaseVector;\n"
"import com.google.flatbuffers.BooleanVector;\n"
"import com.google.flatbuffers.ByteVector;\n"
"import com.google.flatbuffers.Constants;\n"
"import com.google.flatbuffers.DoubleVector;\n"
"import com.google.flatbuffers.FlatBufferBuilder;\n"
"import com.google.flatbuffers.FloatVector;\n"
"import com.google.flatbuffers.IntVector;\n"
"import com.google.flatbuffers.LongVector;\n"
"import com.google.flatbuffers.ShortVector;\n"
"import com.google.flatbuffers.StringVector;\n"
"import com.google.flatbuffers.Struct;\n"
"import com.google.flatbuffers.Table;\n"
"import com.google.flatbuffers.UnionVector;\n"
"import java.nio.ByteBuffer;\n"
"import java.nio.ByteOrder;\n";
if (parser_.opts.gen_nullable) {
code += "\nimport javax.annotation.Nullable;\n";
}
if (parser_.opts.java_checkerframework) {
code += "\nimport org.checkerframework.dataflow.qual.Pure;\n";
}
code += "\n";
}
code += classcode;
if (!namespace_name.empty()) code += "";
const std::string dirs = namer_.Directories(combined_ns);
EnsureDirExists(dirs);
const std::string filename =
dirs + namer_.File(defname, /*skips=*/SkipFile::Suffix);
return SaveFile(filename.c_str(), code, false);
}
const Namespace *CurrentNameSpace() const { return cur_name_space_; }
std::string GenNullableAnnotation(const Type &t) const {
return parser_.opts.gen_nullable &&
!IsScalar(DestinationType(t, true).base_type) &&
t.base_type != BASE_TYPE_VECTOR
? " @Nullable "
: "";
}
std::string GenPureAnnotation(const Type &t) const {
return parser_.opts.java_checkerframework &&
!IsScalar(DestinationType(t, true).base_type)
? " @Pure "
: "";
}
std::string GenTypeBasic(const Type &type) const {
// clang-format off
static const char * const java_typename[] = {
#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, ...) \
#JTYPE,
FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
#undef FLATBUFFERS_TD
};
// clang-format on
return java_typename[type.base_type];
}
std::string GenTypePointer(const Type &type) const {
switch (type.base_type) {
case BASE_TYPE_STRING: return "String";
case BASE_TYPE_VECTOR: return GenTypeGet(type.VectorType());
case BASE_TYPE_STRUCT:
return Prefixed(namer_.NamespacedType(*type.struct_def));
case BASE_TYPE_UNION: FLATBUFFERS_FALLTHROUGH(); // else fall thru
default: return "Table";
}
}
std::string GenTypeGet(const Type &type) const {
return IsScalar(type.base_type)
? GenTypeBasic(type)
: (IsArray(type) ? GenTypeGet(type.VectorType())
: GenTypePointer(type));
}
// Find the destination type the user wants to receive the value in (e.g.
// one size higher signed types for unsigned serialized values in Java).
Type DestinationType(const Type &type, bool vectorelem) const {
switch (type.base_type) {
// We use int for both uchar/ushort, since that generally means less
// casting than using short for uchar.
case BASE_TYPE_UCHAR: return Type(BASE_TYPE_INT);
case BASE_TYPE_USHORT: return Type(BASE_TYPE_INT);
case BASE_TYPE_UINT: return Type(BASE_TYPE_LONG);
case BASE_TYPE_ARRAY:
case BASE_TYPE_VECTOR:
if (vectorelem) return DestinationType(type.VectorType(), vectorelem);
FLATBUFFERS_FALLTHROUGH(); // else fall thru
default: return type;
}
}
std::string GenOffsetType() const { return "int"; }
std::string GenOffsetConstruct(const std::string &variable_name) const {
return variable_name;
}
std::string GenVectorOffsetType() const { return "int"; }
// Generate destination type name
std::string GenTypeNameDest(const Type &type) const {
return GenTypeGet(DestinationType(type, true));
}
// Mask to turn serialized value into destination type value.
std::string DestinationMask(const Type &type, bool vectorelem) const {
switch (type.base_type) {
case BASE_TYPE_UCHAR: return " & 0xFF";
case BASE_TYPE_USHORT: return " & 0xFFFF";
case BASE_TYPE_UINT: return " & 0xFFFFFFFFL";
case BASE_TYPE_VECTOR:
if (vectorelem) return DestinationMask(type.VectorType(), vectorelem);
FLATBUFFERS_FALLTHROUGH(); // else fall thru
default: return "";
}
}
// Casts necessary to correctly read serialized data
std::string DestinationCast(const Type &type) const {
if (IsSeries(type)) {
return DestinationCast(type.VectorType());
} else {
// Cast necessary to correctly read serialized unsigned values.
if (type.base_type == BASE_TYPE_UINT) return "(long)";
}
return "";
}
// Cast statements for mutator method parameters.
// In Java, parameters representing unsigned numbers need to be cast down to
// their respective type. For example, a long holding an unsigned int value
// would be cast down to int before being put onto the buffer.
std::string SourceCast(const Type &type, bool castFromDest) const {
if (IsSeries(type)) {
return SourceCast(type.VectorType(), castFromDest);
} else {
if (castFromDest) {
if (type.base_type == BASE_TYPE_UINT)
return "(int) ";
else if (type.base_type == BASE_TYPE_USHORT)
return "(short) ";
else if (type.base_type == BASE_TYPE_UCHAR)
return "(byte) ";
}
}
return "";
}
std::string SourceCast(const Type &type) const {
return SourceCast(type, true);
}
std::string SourceCastBasic(const Type &type, bool castFromDest) const {
return IsScalar(type.base_type) ? SourceCast(type, castFromDest) : "";
}
std::string SourceCastBasic(const Type &type) const {
return SourceCastBasic(type, true);
}
std::string GenEnumDefaultValue(const FieldDef &field) const {
auto &value = field.value;
FLATBUFFERS_ASSERT(value.type.enum_def);
auto &enum_def = *value.type.enum_def;
auto enum_val = enum_def.FindByValue(value.constant);
return enum_val
? Prefixed(namer_.NamespacedEnumVariant(enum_def, *enum_val))
: value.constant;
}
std::string GenDefaultValue(const FieldDef &field) const {
auto &value = field.value;
auto constant = field.IsScalarOptional() ? "0" : value.constant;
auto longSuffix = "L";
switch (value.type.base_type) {
case BASE_TYPE_BOOL: return constant == "0" ? "false" : "true";
case BASE_TYPE_ULONG: {
// Converts the ulong into its bits signed equivalent
uint64_t defaultValue = StringToUInt(constant.c_str());
return NumToString(static_cast<int64_t>(defaultValue)) + longSuffix;
}
case BASE_TYPE_UINT:
case BASE_TYPE_LONG: return constant + longSuffix;
default:
if (IsFloat(value.type.base_type)) {
if (field.IsScalarOptional()) {
return value.type.base_type == BASE_TYPE_DOUBLE ? "0.0" : "0f";
}
return JavaFloatGen.GenFloatConstant(field);
} else {
return constant;
}
}
}
std::string GenDefaultValueBasic(const FieldDef &field) const {
auto &value = field.value;
if (!IsScalar(value.type.base_type)) { return "0"; }
return GenDefaultValue(field);
}
void GenEnum(EnumDef &enum_def, std::string &code) const {
if (enum_def.generated) return;
// Generate enum definitions of the form:
// public static (final) int name = value;
// In Java, we use ints rather than the Enum feature, because we want them
// to map directly to how they're used in C/C++ and file formats.
// That, and Java Enums are expensive, and not universally liked.
GenComment(enum_def.doc_comment, &code, &comment_config);
code += "@SuppressWarnings(\"unused\")\n";
if (enum_def.attributes.Lookup("private")) {
// For Java, we leave the enum unmarked to indicate package-private
} else {
code += "public ";
}
code += "final class " + namer_.Type(enum_def);
code += " {\n";
code += " private " + namer_.Type(enum_def) + "() { }\n";
for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
auto &ev = **it;
GenComment(ev.doc_comment, &code, &comment_config, " ");
code += " public static final ";
code += GenTypeBasic(DestinationType(enum_def.underlying_type, false));
code += " ";
code += namer_.Variant(ev) + " = ";
code += enum_def.ToString(ev);
if (enum_def.underlying_type.base_type == BASE_TYPE_LONG ||
enum_def.underlying_type.base_type == BASE_TYPE_ULONG) {
code += "L";
}
code += ";\n";
}
// Generate a string table for enum values.
// Problem is, if values are very sparse that could generate really big
// tables. Ideally in that case we generate a map lookup instead, but for
// the moment we simply don't output a table at all.
auto range = enum_def.Distance();
// Average distance between values above which we consider a table
// "too sparse". Change at will.
static const uint64_t kMaxSparseness = 5;
if (range / static_cast<uint64_t>(enum_def.size()) < kMaxSparseness &&
GenTypeBasic(DestinationType(enum_def.underlying_type, false)) !=
"long") {
code += "\n public static final String";
code += "[] names = { ";
const EnumVal *prev = enum_def.Vals().front();
for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end();
++it) {
const EnumVal &ev = **it;
for (auto k = enum_def.Distance(prev, &ev); k > 1; --k)
code += "\"\", ";
prev = &ev;
code += "\"" + namer_.Variant(ev) + "\", ";
}
code += "};\n\n";
code += " public static ";
code += "String";
code += " name";
code += "(int e) { return names[e";
if (enum_def.MinValue()->IsNonZero())
code += " - " + namer_.Variant(enum_def.MinValue()->name);
code += "]; }\n";
}
// Close the class
code += "}\n\n";
}
// Returns the function name that is able to read a value of the given type.
std::string GenGetter(const Type &type) const {
switch (type.base_type) {
case BASE_TYPE_STRING: return "__string";
case BASE_TYPE_STRUCT: return "__struct";
case BASE_TYPE_UNION: return "__union";
case BASE_TYPE_VECTOR: return GenGetter(type.VectorType());
case BASE_TYPE_ARRAY: return GenGetter(type.VectorType());
default: {
std::string getter = "bb.get";
if (type.base_type == BASE_TYPE_BOOL) {
getter = "0!=" + getter;
} else if (GenTypeBasic(type) != "byte") {
getter += ConvertCase(GenTypeBasic(type), Case::kUpperCamel);
}
return getter;
}
}
}
// Returns the function name that is able to read a value of the given type.
std::string GenGetterForLookupByKey(flatbuffers::FieldDef *key_field,
const std::string &data_buffer,
const char *num = nullptr) const {
auto type = key_field->value.type;
auto dest_mask = DestinationMask(type, true);
auto dest_cast = DestinationCast(type);
auto getter = data_buffer + ".get";
if (GenTypeBasic(type) != "byte") {
getter += ConvertCase(GenTypeBasic(type), Case::kUpperCamel);
}
getter = dest_cast + getter + "(" + GenOffsetGetter(key_field, num) + ")" +
dest_mask;
return getter;
}
// Direct mutation is only allowed for scalar fields.
// Hence a setter method will only be generated for such fields.
std::string GenSetter(const Type &type) const {
if (IsScalar(type.base_type)) {
std::string setter = "bb.put";
if (GenTypeBasic(type) != "byte" && type.base_type != BASE_TYPE_BOOL) {
setter += ConvertCase(GenTypeBasic(type), Case::kUpperCamel);
}
return setter;
} else {
return "";
}
}
// Returns the method name for use with add/put calls.
std::string GenMethod(const Type &type) const {
return IsScalar(type.base_type)
? ConvertCase(GenTypeBasic(type), Case::kUpperCamel)
: (IsStruct(type) ? "Struct" : "Offset");
}
// Recursively generate arguments for a constructor, to deal with nested
// structs.
void GenStructArgs(const StructDef &struct_def, std::string &code,
const char *nameprefix, size_t array_count = 0) const {
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
const auto &field_type = field.value.type;
const auto array_field = IsArray(field_type);
const auto &type = array_field ? field_type.VectorType()
: DestinationType(field_type, false);
const auto array_cnt = array_field ? (array_count + 1) : array_count;
if (IsStruct(type)) {
// Generate arguments for a struct inside a struct. To ensure names
// don't clash, and to make it obvious these arguments are constructing
// a nested struct, prefix the name with the field name.
GenStructArgs(*field_type.struct_def, code,
(nameprefix + (field.name + "_")).c_str(), array_cnt);
} else {
code += ", ";
code += GenTypeNameDest(field.value.type);
for (size_t i = 0; i < array_cnt; i++) code += "[]";
code += " ";
code += nameprefix;
code += namer_.Field(field);
}
}
}
// Recusively generate struct construction statements of the form:
// builder.putType(name);
// and insert manual padding.
void GenStructBody(const StructDef &struct_def, std::string &code,
const char *nameprefix, size_t index = 0,
bool in_array = false) const {
std::string indent((index + 1) * 2, ' ');
code += indent + " builder.prep(";
code += NumToString(struct_def.minalign) + ", ";
code += NumToString(struct_def.bytesize) + ");\n";
for (auto it = struct_def.fields.vec.rbegin();
it != struct_def.fields.vec.rend(); ++it) {
auto &field = **it;
const auto &field_type = field.value.type;
if (field.padding) {
code += indent + " builder.pad(";
code += NumToString(field.padding) + ");\n";
}
if (IsStruct(field_type)) {
GenStructBody(*field_type.struct_def, code,
(nameprefix + (field.name + "_")).c_str(), index,
in_array);
} else {
const auto &type =
IsArray(field_type) ? field_type.VectorType() : field_type;
const auto index_var = "_idx" + NumToString(index);
if (IsArray(field_type)) {
code += indent + " for (int " + index_var + " = ";
code += NumToString(field_type.fixed_length);
code += "; " + index_var + " > 0; " + index_var + "--) {\n";
in_array = true;
}
if (IsStruct(type)) {
GenStructBody(*field_type.struct_def, code,
(nameprefix + (field.name + "_")).c_str(), index + 1,
in_array);
} else {
code += IsArray(field_type) ? " " : "";
code += indent + " builder.put";
code += GenMethod(type) + "(";
code += SourceCast(type);
auto argname = nameprefix + namer_.Variable(field);
code += argname;
size_t array_cnt = index + (IsArray(field_type) ? 1 : 0);
for (size_t i = 0; in_array && i < array_cnt; i++) {
code += "[_idx" + NumToString(i) + "-1]";
}
code += ");\n";
}
if (IsArray(field_type)) { code += indent + " }\n"; }
}
}
}
std::string GenOffsetGetter(flatbuffers::FieldDef *key_field,
const char *num = nullptr) const {
std::string key_offset = "";
key_offset += "__offset(" + NumToString(key_field->value.offset) + ", ";
if (num) {
key_offset += num;
key_offset += ", _bb)";
} else {
key_offset += "bb.capacity()";
key_offset += " - tableOffset, bb)";
}
return key_offset;
}
std::string GenLookupKeyGetter(flatbuffers::FieldDef *key_field) const {
std::string key_getter = " ";
key_getter += "int tableOffset = ";
key_getter += "__indirect(vectorLocation + 4 * (start + middle)";
key_getter += ", bb);\n ";
if (IsString(key_field->value.type)) {
key_getter += "int comp = ";
key_getter += "compareStrings(";
key_getter += GenOffsetGetter(key_field);
key_getter += ", byteKey, bb);\n";
} else {
auto get_val = GenGetterForLookupByKey(key_field, "bb");
key_getter += GenTypeNameDest(key_field->value.type) + " val = ";
key_getter += get_val + ";\n";
key_getter += " int comp = val > key ? 1 : val < key ? -1 : 0;\n";
}
return key_getter;
}
std::string GenKeyGetter(flatbuffers::FieldDef *key_field) const {
std::string key_getter = "";
auto data_buffer = "_bb";
if (IsString(key_field->value.type)) {
key_getter += " return ";
key_getter += "";
key_getter += "compareStrings(";
key_getter += GenOffsetGetter(key_field, "o1") + ", ";
key_getter += GenOffsetGetter(key_field, "o2") + ", " + data_buffer + ")";
key_getter += ";";
} else {
auto field_getter = GenGetterForLookupByKey(key_field, data_buffer, "o1");
key_getter +=
"\n " + GenTypeNameDest(key_field->value.type) + " val_1 = ";
key_getter +=
field_getter + ";\n " + GenTypeNameDest(key_field->value.type);
key_getter += " val_2 = ";
field_getter = GenGetterForLookupByKey(key_field, data_buffer, "o2");
key_getter += field_getter + ";\n";
key_getter += " return val_1 > val_2 ? 1 : val_1 < val_2 ? -1 : 0;\n ";
}
return key_getter;
}
void GenStruct(StructDef &struct_def, std::string &code,
const IDLOptions &opts) const {
if (struct_def.generated) return;
// Generate a struct accessor class, with methods of the form:
// public type name() { return bb.getType(i + offset); }
// or for tables of the form:
// public type name() {
// int o = __offset(offset); return o != 0 ? bb.getType(o + i) : default;
// }
GenComment(struct_def.doc_comment, &code, &comment_config);
if (parser_.opts.gen_generated) {
code += "@javax.annotation.Generated(value=\"flatc\")\n";
}
code += "@SuppressWarnings(\"unused\")\n";
if (struct_def.attributes.Lookup("private")) {
// For Java, we leave the struct unmarked to indicate package-private
} else {
code += "public ";
}
const auto struct_class = namer_.Type(struct_def);
code += "final class " + struct_class;
code += " extends ";
code += struct_def.fixed ? "Struct" : "Table";
code += " {\n";
if (!struct_def.fixed) {
// Generate version check method.
// Force compile time error if not using the same version runtime.
code += " public static void ValidateVersion() {";
code += " Constants.";
code += "FLATBUFFERS_24_3_25(); ";
code += "}\n";
// Generate a special accessor for the table that when used as the root
// of a FlatBuffer
const std::string method_name =
namer_.LegacyJavaMethod2("getRootAs", struct_def, "");
const std::string method_signature =
" public static " + struct_class + " " + method_name;
// create convenience method that doesn't require an existing object
code += method_signature + "(ByteBuffer _bb) ";
code +=
"{ return " + method_name + "(_bb, new " + struct_class + "()); }\n";
// create method that allows object reuse
code +=
method_signature + "(ByteBuffer _bb, " + struct_class + " obj) { ";
code += "_bb.order(ByteOrder.LITTLE_ENDIAN); ";
code += "return (obj.__assign(_bb.getInt(_bb.";
code += "position()";
code += ") + _bb.";
code += "position()";
code += ", _bb)); }\n";
if (parser_.root_struct_def_ == &struct_def) {
if (parser_.file_identifier_.length()) {
// Check if a buffer has the identifier.
code += " public static ";
code += "boolean " +
namer_.LegacyJavaMethod2(
"", struct_def, "BufferHasIdentifier(ByteBuffer _bb)") +
" { return ";
code += "__has_identifier(_bb, \"";
code += parser_.file_identifier_;
code += "\"); }\n";
}
}
}
// Generate the __init method that sets the field in a pre-existing
// accessor object. This is to allow object reuse.
code += " public void __init(int _i, ByteBuffer _bb) ";
code += "{ ";
code += "__reset(_i, _bb); ";
code += "}\n";
code += " public " + struct_class + " __assign(int _i, ByteBuffer _bb) ";
code += "{ __init(_i, _bb); return this; }\n\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
if (field.deprecated) continue;
GenComment(field.doc_comment, &code, &comment_config, " ");
const std::string type_name = GenTypeGet(field.value.type);
const std::string type_name_dest = GenTypeNameDest(field.value.type);
const std::string dest_mask = DestinationMask(field.value.type, true);
const std::string dest_cast = DestinationCast(field.value.type);
const std::string src_cast = SourceCast(field.value.type);
const std::string method_start =
" public " +
(field.IsRequired() ? "" : GenNullableAnnotation(field.value.type)) +
GenPureAnnotation(field.value.type) + type_name_dest + " " +
namer_.Field(field);
const std::string obj = "obj";
// Most field accessors need to retrieve and test the field offset first,
// this is the prefix code for that:
auto offset_prefix =
IsArray(field.value.type)
? " { return "
: (" { int o = __offset(" + NumToString(field.value.offset) +
"); return o != 0 ? ");
// Generate the accessors that don't do object reuse.
if (field.value.type.base_type == BASE_TYPE_STRUCT) {
// Calls the accessor that takes an accessor object with a new object.
code += method_start + "() { return ";
code += namer_.Field(field);
code += "(new ";
code += type_name + "()); }\n";
} else if (IsSeries(field.value.type) &&
field.value.type.element == BASE_TYPE_STRUCT) {
// Accessors for vectors of structs also take accessor objects, this
// generates a variant without that argument.
code += method_start + "(int j) { return ";
code += namer_.Field(field);
code += "(new " + type_name + "(), j); }\n";
}
if (field.IsScalarOptional()) { code += GenOptionalScalarCheck(field); }
std::string getter = dest_cast + GenGetter(field.value.type);
code += method_start;
std::string member_suffix = "; ";
if (IsScalar(field.value.type.base_type)) {
code += "()";
member_suffix += "";
if (struct_def.fixed) {
code += " { return " + getter;
code += "(bb_pos + ";
code += NumToString(field.value.offset) + ")";
code += dest_mask;
} else {
code += offset_prefix + getter;
code += "(o + bb_pos)" + dest_mask;
code += " : ";
code += GenDefaultValue(field);
}
} else {
switch (field.value.type.base_type) {
case BASE_TYPE_STRUCT:
code += "(" + type_name + " obj)";
if (struct_def.fixed) {
code += " { return " + obj + ".__assign(";
code += "bb_pos + " + NumToString(field.value.offset) + ", ";
code += "bb)";
} else {
code += offset_prefix;
code += obj + ".__assign(";
code += field.value.type.struct_def->fixed
? "o + bb_pos"
: "__indirect(o + bb_pos)";
code += ", bb) : null";
}
break;
case BASE_TYPE_STRING:
code += "()";
member_suffix += "";
code += offset_prefix + getter + "(o + ";
code += "bb_pos) : null";
break;
case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_VECTOR: {
auto vectortype = field.value.type.VectorType();
code += "(";
if (vectortype.base_type == BASE_TYPE_STRUCT) {
code += type_name + " obj, ";
getter = obj + ".__assign";
} else if (vectortype.base_type == BASE_TYPE_UNION) {
code += type_name + " obj, ";
}
code += "int j)";
const auto body = offset_prefix + getter + "(";
if (vectortype.base_type == BASE_TYPE_UNION) {
code += body + "obj, ";
} else {
code += body;
}
std::string index;
if (IsArray(field.value.type)) {
index += "bb_pos + " + NumToString(field.value.offset) + " + ";
} else {
index += "__vector(o) + ";
}
index += "j * " + NumToString(InlineSize(vectortype));
if (vectortype.base_type == BASE_TYPE_STRUCT) {
code += vectortype.struct_def->fixed
? index
: "__indirect(" + index + ")";
code += ", bb";
} else {
code += index;
}
code += ")" + dest_mask;
if (!IsArray(field.value.type)) {
code += " : ";
code += field.value.type.element == BASE_TYPE_BOOL
? "false"
: (IsScalar(field.value.type.element) ? "0" : "null");
}
break;
}
case BASE_TYPE_UNION:
code += "(" + type_name + " obj)" + offset_prefix + getter;
code += "(obj, o + bb_pos) : null";
break;
default: FLATBUFFERS_ASSERT(0);
}
}
code += member_suffix;
code += "}\n";
if (IsVector(field.value.type)) {
code += " public int " + namer_.Field(field);
code += "Length";
code += "()";
code += offset_prefix;
code += "__vector_len(o) : 0; ";
code += "";
code += "}\n";
// See if we should generate a by-key accessor.
if (field.value.type.element == BASE_TYPE_STRUCT &&
!field.value.type.struct_def->fixed) {
auto &sd = *field.value.type.struct_def;
auto &fields = sd.fields.vec;
for (auto kit = fields.begin(); kit != fields.end(); ++kit) {
auto &key_field = **kit;
if (key_field.key) {
auto qualified_name = Prefixed(namer_.NamespacedType(sd));
code += " public " + qualified_name + " ";
code += namer_.Method(field) + "ByKey(";
code += GenTypeNameDest(key_field.value.type) + " key)";
code += offset_prefix;
code += qualified_name + ".__lookup_by_key(";
code += "null, ";
code += "__vector(o), key, ";
code += "bb) : null; ";
code += "}\n";
code += " public " + qualified_name + " ";
code += namer_.Method(field) + "ByKey(";
code += qualified_name + " obj, ";
code += GenTypeNameDest(key_field.value.type) + " key)";
code += offset_prefix;
code += qualified_name + ".__lookup_by_key(obj, ";
code += "__vector(o), key, ";
code += "bb) : null; ";
code += "}\n";
break;
}
}
}
}
// Generate the accessors for vector of structs with vector access object
if (IsVector(field.value.type)) {
std::string vector_type_name;
const auto &element_base_type = field.value.type.VectorType().base_type;
if (IsScalar(element_base_type)) {
vector_type_name =
ConvertCase(type_name, Case::kUpperCamel) + "Vector";
} else if (element_base_type == BASE_TYPE_STRING) {
vector_type_name = "StringVector";
} else if (element_base_type == BASE_TYPE_UNION) {
vector_type_name = "UnionVector";
} else {
vector_type_name = type_name + ".Vector";
}
auto vector_method_start = GenNullableAnnotation(field.value.type) +
" public " + vector_type_name + " " +
namer_.Field(field, "vector");
code += vector_method_start + "() { return ";
code += namer_.Field(field, "vector");
code += "(new " + vector_type_name + "()); }\n";
code += vector_method_start + "(" + vector_type_name + " obj)";
code += offset_prefix + obj + ".__assign(";
code += "__vector(o), ";
if (!IsScalar(element_base_type)) {
auto vectortype = field.value.type.VectorType();
code += NumToString(InlineSize(vectortype)) + ", ";
}
code += "bb) : null" + member_suffix + "}\n";
}
// Generate a ByteBuffer accessor for strings & vectors of scalars.
if ((IsVector(field.value.type) &&
IsScalar(field.value.type.VectorType().base_type)) ||
IsString(field.value.type)) {
code += " public ByteBuffer ";
code += namer_.Field(field);
code += "AsByteBuffer() { return ";
code += "__vector_as_bytebuffer(";
code += NumToString(field.value.offset) + ", ";
code += NumToString(IsString(field.value.type)
? 1
: InlineSize(field.value.type.VectorType()));
code += "); }\n";
code += " public ByteBuffer ";
code += namer_.Field(field);
code += "InByteBuffer(ByteBuffer _bb) { return ";
code += "__vector_in_bytebuffer(_bb, ";
code += NumToString(field.value.offset) + ", ";
code += NumToString(IsString(field.value.type)
? 1
: InlineSize(field.value.type.VectorType()));
code += "); }\n";
}
// generate object accessors if is nested_flatbuffer
if (field.nested_flatbuffer) {
auto nested_type_name =
Prefixed(namer_.NamespacedType(*field.nested_flatbuffer));
auto nested_method_name =
namer_.Field(field) + "As" + field.nested_flatbuffer->name;
auto get_nested_method_name = nested_method_name;
code += " public " + nested_type_name + " ";
code += nested_method_name + "() { return ";
code +=
get_nested_method_name + "(new " + nested_type_name + "()); }\n";
code += " public " + nested_type_name + " ";
code += get_nested_method_name + "(";
code += nested_type_name + " obj";
code += ") { int o = __offset(";
code += NumToString(field.value.offset) + "); ";
code += "return o != 0 ? " + obj + ".__assign(";
code += "";
code += "__indirect(__vector(o)), ";
code += "bb) : null; }\n";
}
// Generate mutators for scalar fields or vectors of scalars.
if (parser_.opts.mutable_buffer) {
auto is_series = (IsSeries(field.value.type));
const auto &underlying_type =
is_series ? field.value.type.VectorType() : field.value.type;
// Boolean parameters have to be explicitly converted to byte
// representation.
auto setter_parameter = underlying_type.base_type == BASE_TYPE_BOOL
? "(byte)(" + field.name + " ? 1 : 0)"
: field.name;
// A vector mutator also needs the index of the vector element it should
// mutate.
auto mutator_params = (is_series ? "(int j, " : "(") +
GenTypeNameDest(underlying_type) + " " +
field.name + ") { ";
auto setter_index =
is_series
? (IsArray(field.value.type)
? "bb_pos + " + NumToString(field.value.offset)
: "__vector(o)") +
+" + j * " + NumToString(InlineSize(underlying_type))
: (struct_def.fixed
? "bb_pos + " + NumToString(field.value.offset)
: "o + bb_pos");
if (IsScalar(underlying_type.base_type) && !IsUnion(field.value.type)) {
code += " public ";
code += struct_def.fixed ? "void " : "boolean ";
code += namer_.Method("mutate", field);
code += mutator_params;
if (struct_def.fixed) {
code += GenSetter(underlying_type) + "(" + setter_index + ", ";
code += src_cast + setter_parameter + "); }\n";
} else {
code += "int o = __offset(";
code += NumToString(field.value.offset) + ");";
code += " if (o != 0) { " + GenSetter(underlying_type);
code += "(" + setter_index + ", " + src_cast + setter_parameter +
"); return true; } else { return false; } }\n";
}
}
}
if (parser_.opts.java_primitive_has_method &&
IsScalar(field.value.type.base_type) && !struct_def.fixed) {
auto vt_offset_constant = " public static final int VT_" +
namer_.Constant(field) + " = " +
NumToString(field.value.offset) + ";";
code += vt_offset_constant;
code += "\n";
}
}
code += "\n";
auto struct_has_create = false;
std::set<flatbuffers::FieldDef *> field_has_create_set;
flatbuffers::FieldDef *key_field = nullptr;
if (struct_def.fixed) {
struct_has_create = true;
// create a struct constructor function
code += " public static " + GenOffsetType() + " ";
code += "create";
code += struct_class + "(FlatBufferBuilder builder";
GenStructArgs(struct_def, code, "");
code += ") {\n";
GenStructBody(struct_def, code, "");
code += " return ";
code += GenOffsetConstruct("builder." + std::string("offset()"));
code += ";\n }\n";
} else {
// Generate a method that creates a table in one go. This is only possible
// when the table has no struct fields, since those have to be created
// inline, and there's no way to do so in Java.
bool has_no_struct_fields = true;
int num_fields = 0;
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
if (field.deprecated) continue;
if (IsStruct(field.value.type)) {
has_no_struct_fields = false;
} else {
num_fields++;
}
}
// JVM specifications restrict default constructor params to be < 255.
// Longs and doubles take up 2 units, so we set the limit to be < 127.
if (has_no_struct_fields && num_fields && num_fields < 127) {
struct_has_create = true;
// Generate a table constructor of the form:
// public static int createName(FlatBufferBuilder builder, args...)
code += " public static " + GenOffsetType() + " ";
code += namer_.LegacyJavaMethod2("create", struct_def, "");
code += "(FlatBufferBuilder builder";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
auto field_name = namer_.Field(field);
if (field.deprecated) continue;
code += ",\n ";
code += GenTypeBasic(DestinationType(field.value.type, false));
code += " ";
code += field_name;
if (!IsScalar(field.value.type.base_type)) code += "Offset";
}
code += ") {\n builder.";
code += "startTable(";
code += NumToString(struct_def.fields.vec.size()) + ");\n";
for (size_t size = struct_def.sortbysize ? sizeof(largest_scalar_t) : 1;
size; size /= 2) {
for (auto it = struct_def.fields.vec.rbegin();
it != struct_def.fields.vec.rend(); ++it) {
auto &field = **it;
auto field_name = namer_.Field(field);
if (!field.deprecated &&
(!struct_def.sortbysize ||
size == SizeOf(field.value.type.base_type))) {
code += " " + struct_class + ".";
code += namer_.Method("add", field) + "(builder, " + field_name;
if (!IsScalar(field.value.type.base_type)) code += "Offset";
code += ");\n";
}
}
}
code += " return " + struct_class + ".";
code += namer_.LegacyJavaMethod2("end", struct_def, "");
code += "(builder);\n }\n\n";
}
// Generate a set of static methods that allow table construction,
// of the form:
// public static void addName(FlatBufferBuilder builder, short name)
// { builder.addShort(id, name, default); }
// Unlike the Create function, these always work.
code += " public static void start";
code += struct_class;
code += "(FlatBufferBuilder builder) { builder.";
code += "startTable(";
code += NumToString(struct_def.fields.vec.size()) + "); }\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
if (field.deprecated) continue;
code += " public static void " + namer_.Method("add", field);
code += "(FlatBufferBuilder builder, ";
code += GenTypeBasic(DestinationType(field.value.type, false));
auto argname = namer_.Field(field);
if (!IsScalar(field.value.type.base_type)) argname += "Offset";
code += " " + argname + ") { builder.add";
code += GenMethod(field.value.type) + "(";
if (field.key) {
// field has key attribute, so always need to exist
// even if its value is equal to default.
// Generated code will bypass default checking
// resulting in { builder.addShort(name); slot(id); }
key_field = &field;
code += SourceCastBasic(field.value.type);
code += argname;
code += "); builder.slot(" +
NumToString(it - struct_def.fields.vec.begin()) + "); }\n";
} else {
code += NumToString(it - struct_def.fields.vec.begin()) + ", ";
code += SourceCastBasic(field.value.type);
code += argname;
code += ", ";
code += SourceCastBasic(field.value.type);
code += GenDefaultValue(field);
code += "); }\n";
}
if (IsVector(field.value.type)) {
auto vector_type = field.value.type.VectorType();
auto alignment = InlineAlignment(vector_type);
auto elem_size = InlineSize(vector_type);
if (!IsStruct(vector_type)) {
field_has_create_set.insert(&field);
// generate a method to create a vector from a java array.
if ((vector_type.base_type == BASE_TYPE_CHAR ||
vector_type.base_type == BASE_TYPE_UCHAR)) {
// Handle byte[] and ByteBuffers separately for Java
code += " public static " + GenVectorOffsetType() + " ";
code += namer_.Method("create", field);
code += "Vector(FlatBufferBuilder builder, byte[] data) ";
code += "{ return builder.createByteVector(data); }\n";
code += " public static " + GenVectorOffsetType() + " ";
code += namer_.Method("create", field);
code += "Vector(FlatBufferBuilder builder, ByteBuffer data) ";
code += "{ return builder.createByteVector(data); }\n";
} else {
code += " public static " + GenVectorOffsetType() + " ";
code += namer_.Method("create", field);
code += "Vector(FlatBufferBuilder builder, ";
code += GenTypeBasic(DestinationType(vector_type, false)) +
"[] data) ";
code += "{ builder.startVector(";
code += NumToString(elem_size);
code += ", data.length, ";
code += NumToString(alignment);
code += "); for (int i = data.";
code += "length - 1; i >= 0; i--) builder.";
code += "add";
code += GenMethod(vector_type);
code += "(";
code += SourceCastBasic(vector_type);
code += "data[i]";
code += "); return ";
code += "builder.endVector(); }\n";
}
}
// Generate a method to start a vector, data to be added manually
// after.
code += " public static void " + namer_.Method("start", field);
code += "Vector(FlatBufferBuilder builder, int numElems) ";
code += "{ builder.startVector(";
code += NumToString(elem_size);
code += ", numElems, " + NumToString(alignment);
code += "); }\n";
}
}
code += " public static " + GenOffsetType() + " ";
code += namer_.LegacyJavaMethod2("end", struct_def, "");
code += "(FlatBufferBuilder builder) {\n int o = builder.";
code += "endTable();\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
if (!field.deprecated && field.IsRequired()) {
code += " builder.required(o, ";
code += NumToString(field.value.offset);
code += "); // " + field.name + "\n";
}
}
code += " return " + GenOffsetConstruct("o") + ";\n }\n";
if (parser_.root_struct_def_ == &struct_def) {
std::string size_prefix[] = { "", "SizePrefixed" };
for (int i = 0; i < 2; ++i) {
code += " public static void ";
code += namer_.LegacyJavaMethod2("finish" + size_prefix[i],
struct_def, "Buffer");
code += "(FlatBufferBuilder builder, " + GenOffsetType();
code += " offset) {";
code += " builder.finish" + size_prefix[i] + "(offset";
if (parser_.file_identifier_.length())
code += ", \"" + parser_.file_identifier_ + "\"";
code += "); }\n";
}
}
}
// Only generate key compare function for table,
// because `key_field` is not set for struct
if (struct_def.has_key && !struct_def.fixed) {
FLATBUFFERS_ASSERT(key_field);
code += "\n @Override\n protected int keysCompare(";
code += "Integer o1, Integer o2, ByteBuffer _bb) {";
code += GenKeyGetter(key_field);
code += " }\n";
code += "\n public static " + struct_class;
code += " __lookup_by_key(";
code += struct_class + " obj, ";
code += "int vectorLocation, ";
code += GenTypeNameDest(key_field->value.type);
code += " key, ByteBuffer bb) {\n";
if (IsString(key_field->value.type)) {
code += " byte[] byteKey = ";
code += "key.getBytes(java.nio.charset.StandardCharsets.UTF_8);\n";
}
code += " int span = ";
code += "bb.getInt(vectorLocation - 4);\n";
code += " int start = 0;\n";
code += " while (span != 0) {\n";
code += " int middle = span / 2;\n";
code += GenLookupKeyGetter(key_field);
code += " if (comp > 0) {\n";
code += " span = middle;\n";
code += " } else if (comp < 0) {\n";
code += " middle++;\n";
code += " start += middle;\n";
code += " span -= middle;\n";
code += " } else {\n";
code += " return ";
code += "(obj == null ? new " + struct_class + "() : obj)";
code += ".__assign(tableOffset, bb);\n";
code += " }\n }\n";
code += " return null;\n";
code += " }\n";
}
GenVectorAccessObject(struct_def, code);
if (opts.generate_object_based_api) {
GenPackUnPack_ObjectAPI(struct_def, code, opts, struct_has_create,
field_has_create_set);
}
code += "}\n\n";
}
std::string GenOptionalScalarCheck(FieldDef &field) const {
if (!field.IsScalarOptional()) return "";
return " public boolean " + namer_.Method("has", field) +
"() { return 0 != __offset(" + NumToString(field.value.offset) +
"); }\n";
}
void GenVectorAccessObject(StructDef &struct_def, std::string &code) const {
// Generate a vector of structs accessor class.
code += "\n";
code += " ";
if (!struct_def.attributes.Lookup("private")) code += "public ";
code += "static ";
code += "final ";
code += "class Vector extends ";
code += "BaseVector {\n";
// Generate the __assign method that sets the field in a pre-existing
// accessor object. This is to allow object reuse.
std::string method_indent = " ";
code += method_indent + "public Vector ";
code += "__assign(int _vector, int _element_size, ByteBuffer _bb) { ";
code += "__reset(_vector, _element_size, _bb); return this; }\n\n";
auto type_name = namer_.Type(struct_def);
auto method_start = method_indent + "public " + type_name + " get";
// Generate the accessors that don't do object reuse.
code += method_start + "(int j) { return get";
code += "(new " + type_name + "(), j); }\n";
code += method_start + "(" + type_name + " obj, int j) { ";
code += " return obj.__assign(";
std::string index = "__element(j)";
code += struct_def.fixed ? index : "__indirect(" + index + ", bb)";
code += ", bb); }\n";
// See if we should generate a by-key accessor.
if (!struct_def.fixed) {
auto &fields = struct_def.fields.vec;
for (auto kit = fields.begin(); kit != fields.end(); ++kit) {
auto &key_field = **kit;
if (key_field.key) {
auto nullable_annotation =
parser_.opts.gen_nullable ? "@Nullable " : "";
code += method_indent + nullable_annotation;
code += "public " + type_name + " ";
code += "getByKey(";
code += GenTypeNameDest(key_field.value.type) + " key) { ";
code += " return __lookup_by_key(null, ";
code += "__vector(), key, ";
code += "bb); ";
code += "}\n";
code += method_indent + nullable_annotation;
code += "public " + type_name + " ";
code += "getByKey(";
code += type_name + " obj, ";
code += GenTypeNameDest(key_field.value.type) + " key) { ";
code += " return __lookup_by_key(obj, ";
code += "__vector(), key, ";
code += "bb); ";
code += "}\n";
break;
}
}
}
code += " }\n";
}
void GenEnum_ObjectAPI(EnumDef &enum_def, std::string &code) const {
if (enum_def.generated) return;
code += "import com.google.flatbuffers.FlatBufferBuilder;\n\n";
if (!enum_def.attributes.Lookup("private")) { code += "public "; }
auto union_name = namer_.Type(enum_def) + "Union";
auto union_type =
GenTypeBasic(DestinationType(enum_def.underlying_type, false));
code += "class " + union_name + " {\n";
// Type
code += " private " + union_type + " type;\n";
// Value
code += " private Object value;\n";
code += "\n";
// getters and setters
code += " public " + union_type + " getType() { return type; }\n\n";
code += " public void setType(" + union_type +
" type) { this.type = type; }\n\n";
code += " public Object getValue() { return value; }\n\n";
code += " public void setValue(Object value) { this.value = value; }\n\n";
// Constructor
code += " public " + union_name + "() {\n";
code +=
" this.type = " + namer_.EnumVariant(enum_def, *enum_def.Vals()[0]) +
";\n";
code += " this.value = null;\n";
code += " }\n\n";
// As
for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
auto &ev = **it;
if (ev.union_type.base_type == BASE_TYPE_NONE) continue;
auto type_name = GenTypeGet_ObjectAPI(ev.union_type, false, true);
if (ev.union_type.base_type == BASE_TYPE_STRUCT &&
ev.union_type.struct_def->attributes.Lookup("private")) {
code += " ";
} else {
code += " public ";
}
code += type_name + " as" + ev.name + "() { return (" + type_name +
") value; }\n";
}
code += "\n";
// pack()
code += " public static int pack(FlatBufferBuilder builder, " +
union_name + " _o) {\n";
code += " switch (_o.type) {\n";
for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
auto &ev = **it;
if (ev.union_type.base_type == BASE_TYPE_NONE) {
continue;
} else {
code += " case " + namer_.EnumVariant(enum_def, ev) + ": return ";
if (IsString(ev.union_type)) {
code += "builder.createString(_o.as" + ev.name + "());\n";
} else {
code += GenTypeGet(ev.union_type) + ".pack(builder, _o.as" + ev.name +
"());\n";
}
}
}
code += " default: return 0;\n";
code += " }\n";
code += " }\n";
code += "}\n\n";
}
void GenUnionUnPack_ObjectAPI(const EnumDef &enum_def, std::string &code,
const std::string &type_name,
const std::string &field_name,
bool is_vector) const {
const std::string variable_type =
is_vector ? type_name.substr(0, type_name.length() - 2) : type_name;
const std::string variable_name =
"_" + namer_.Variable("o", field_name) + (is_vector ? "Element" : "");
const std::string type_params = is_vector ? "_j" : "";
const std::string value_params = is_vector ? ", _j" : "";
const std::string indent = (is_vector ? " " : " ");
code += indent + variable_type + " " + variable_name + " = new " +
variable_type + "();\n";
code += indent +
GenTypeBasic(DestinationType(enum_def.underlying_type, false)) +
" " + variable_name + "Type = " + field_name + "Type(" +
type_params + ");\n";
code += indent + variable_name + ".setType(" + variable_name + "Type);\n";
code += indent + "Table " + variable_name + "Value;\n";
code += indent + "switch (" + variable_name + "Type) {\n";
for (auto eit = enum_def.Vals().begin(); eit != enum_def.Vals().end();
++eit) {
auto &ev = **eit;
if (ev.union_type.base_type == BASE_TYPE_NONE) {
continue;
} else {
if (ev.union_type.base_type == BASE_TYPE_STRING ||
(ev.union_type.base_type == BASE_TYPE_STRUCT &&
ev.union_type.struct_def->fixed)) {
continue; // This branch is due to bad implemantation of Unions in
// Java which doesn't handle non Table types. Should be
// deleted when issue #6561 is fixed.
}
code += indent + " case " +
Prefixed(namer_.NamespacedEnumVariant(enum_def, ev)) + ":\n";
auto actual_type = GenTypeGet(ev.union_type);
code += indent + " " + variable_name + "Value = " + field_name +
"(new " + actual_type + "()" + value_params + ");\n";
code += indent + " " + variable_name + ".setValue(" + variable_name +
"Value != null ? ((" + actual_type + ") " + variable_name +
"Value).unpack() : null);\n";
code += indent + " break;\n";
}
}
code += indent + " default: break;\n";
code += indent + "}\n";
if (is_vector) {
code += indent + "_" + namer_.Variable("o", field_name) +
"[_j] = " + variable_name + ";\n";
}
}
void GenPackUnPack_ObjectAPI(
StructDef &struct_def, std::string &code, const IDLOptions &opts,
bool struct_has_create,
const std::set<FieldDef *> &field_has_create) const {
auto struct_name = namer_.ObjectType(struct_def);
// unpack()
code += " public " + struct_name + " unpack() {\n";
code += " " + struct_name + " _o = new " + struct_name + "();\n";
code += " unpackTo(_o);\n";
code += " return _o;\n";
code += " }\n";
// unpackTo()
code += " public void unpackTo(" + struct_name + " _o) {\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
const auto &field = **it;
if (field.deprecated) continue;
if (field.value.type.base_type == BASE_TYPE_UTYPE) continue;
if (field.value.type.element == BASE_TYPE_UTYPE) continue;
const auto accessor = namer_.Method(field);
const auto variable = "_" + namer_.Variable("o", field);
const auto get_field = namer_.Method("get", field);
const auto set_field = namer_.Method("set", field);
auto type_name = GenTypeGet_ObjectAPI(field.value.type, false, true);
if (field.IsScalarOptional())
type_name = ConvertPrimitiveTypeToObjectWrapper_ObjectAPI(type_name);
auto start = " " + type_name + " " + variable + " = ";
auto call_setter = true;
switch (field.value.type.base_type) {
case BASE_TYPE_STRUCT: {
auto fixed = struct_def.fixed && field.value.type.struct_def->fixed;
if (fixed) {
code +=
" " + accessor + "().unpackTo(_o." + get_field + "());\n";
} else {
code += " if (" + accessor + "() != null) ";
if (field.value.type.struct_def->fixed) {
code += accessor + "().unpackTo(_o." + get_field + "());\n";
} else {
code += "_o." + set_field + "(" + accessor + "().unpack());\n";
}
code += " else _o." + set_field + "(null);\n";
}
call_setter = false;
break;
}
case BASE_TYPE_ARRAY: {
auto length_str = NumToString(field.value.type.fixed_length);
auto unpack_method =
field.value.type.struct_def == nullptr ? "" : ".unpack()";
code += start + "_o." + get_field + "();\n";
code += " for (int _j = 0; _j < " + length_str + "; ++_j) { " +
variable + "[_j] = " + accessor + "(_j)" + unpack_method +
"; }\n";
call_setter = false;
break;
}
case BASE_TYPE_VECTOR:
if (field.value.type.element == BASE_TYPE_UNION) {
code += start + "new " +
GenConcreteTypeGet_ObjectAPI(field.value.type)
.substr(0, type_name.length() - 1) +
accessor + "Length()];\n";
code +=
" for (int _j = 0; _j < " + accessor + "Length(); ++_j) {\n";
GenUnionUnPack_ObjectAPI(*field.value.type.enum_def, code,
type_name, accessor, true);
code += " }\n";
} else if (field.value.type.element != BASE_TYPE_UTYPE) {
auto fixed = field.value.type.struct_def == nullptr;
const auto length_accessor = namer_.Method(field, "length");
code += start + "new " +
GenConcreteTypeGet_ObjectAPI(field.value.type)
.substr(0, type_name.length() - 1) +
length_accessor + "()];\n";
code +=
" for (int _j = 0; _j < " + length_accessor + "(); ++_j) {";
code += variable + "[_j] = ";
if (fixed) {
code += accessor + "(_j)";
} else {
code += "(" + accessor + "(_j) != null ? " + accessor +
"(_j).unpack() : null)";
}
code += ";}\n";
}
break;
case BASE_TYPE_UTYPE: break;
case BASE_TYPE_UNION: {
GenUnionUnPack_ObjectAPI(*field.value.type.enum_def, code, type_name,
accessor, false);
break;
}
default: {
if (field.IsScalarOptional()) {
code += start + namer_.Method("has", field) + "() ? " + accessor +
"() : null;\n";
} else {
code += start + accessor + "();\n";
}
break;
}
}
if (call_setter) {
code += " _o." + set_field + "(" + variable + ");\n";
}
}
code += " }\n";
// pack()
code += " public static " + GenOffsetType() +
" pack(FlatBufferBuilder builder, " + struct_name + " _o) {\n";
code += " if (_o == null) return 0;\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
if (field.deprecated) continue;
const auto field_name = namer_.Field(field);
const auto variable = "_" + namer_.Variable("o", field);
const auto get_field = namer_.Method("get", field);
// pre
switch (field.value.type.base_type) {
case BASE_TYPE_STRUCT: {
if (!field.value.type.struct_def->fixed) {
code += " " + GenOffsetType() + " _" + namer_.Variable(field) +
" = _o." + get_field +
"() == null ? 0 : " + GenTypeGet(field.value.type) +
".pack(builder, _o." + get_field + "());\n";
} else if (struct_def.fixed && struct_has_create) {
std::vector<FieldArrayLength> array_lengths;
FieldArrayLength tmp_array_length = {
field.name,
field.value.type.fixed_length,
};
array_lengths.push_back(tmp_array_length);
GenStructPackDecl_ObjectAPI(*field.value.type.struct_def,
array_lengths, code);
}
break;
}
case BASE_TYPE_STRING: {
code += " int _" + field_name + " = _o." + get_field +
"() == null ? 0 : "
"builder.createString(_o." +
get_field + "());\n";
break;
}
case BASE_TYPE_VECTOR: {
if (field_has_create.find(&field) != field_has_create.end()) {
auto property_name = field_name;
auto gen_for_loop = true;
std::string array_name = "__" + field_name;
std::string array_type = "";
std::string element_type = "";
std::string to_array = "";
switch (field.value.type.element) {
case BASE_TYPE_STRING: {
array_type = "int";
element_type = "String";
to_array = "builder.createString(_e)";
break;
}
case BASE_TYPE_STRUCT:
array_type = "int";
element_type =
GenTypeGet_ObjectAPI(field.value.type, true, true);
;
to_array = GenTypeGet(field.value.type) + ".pack(builder, _e)";
break;
case BASE_TYPE_UTYPE:
property_name = field_name.substr(0, field_name.size() - 4);
array_type = GenTypeBasic(DestinationType(
field.value.type.enum_def->underlying_type, false));
element_type = field.value.type.enum_def->name + "Union";
to_array = "_o." + namer_.Method("get", property_name) +
"()[_j].getType()";
break;
case BASE_TYPE_UNION:
array_type = "int";
element_type = Prefixed(namer_.NamespacedType(
*field.value.type.enum_def)) +
"Union";
to_array = element_type + ".pack(builder, _o." +
namer_.Method("get", property_name) + "()[_j])";
break;
case BASE_TYPE_UCHAR: // TODO this branch of the switch is due to
// inconsistent behavior in unsigned byte.
// Read further at Issue #6574.
array_type = "byte";
element_type = "int";
to_array = "(byte) _e";
break;
default:
gen_for_loop = false;
array_name = "_o." + namer_.Method("get", property_name) + "()";
array_type = GenTypeNameDest(field.value.type);
element_type = array_type;
to_array = "_e";
break;
}
code += " int _" + field_name + " = 0;\n";
code += " if (_o." + namer_.Method("get", property_name) +
"() != null) {\n";
if (gen_for_loop) {
code += " " + array_type + "[] " + array_name + " = new " +
array_type + "[_o." +
namer_.Method("get", property_name) + "().length];\n";
code += " int _j = 0;\n";
code += " for (" + element_type + " _e : _o." +
namer_.Method("get", property_name) + "()) { ";
code += array_name + "[_j] = " + to_array + "; _j++;}\n";
}
code += " _" + field_name + " = " +
namer_.Method("create", field) + "Vector(builder, " +
array_name + ");\n";
code += " }\n";
} else {
auto type_name = GenTypeGet(field.value.type);
auto element_type_name =
GenTypeGet_ObjectAPI(field.value.type, true, true);
auto pack_method =
field.value.type.struct_def == nullptr
? "builder.add" + GenMethod(field.value.type.VectorType()) +
"(" + variable + "[_j]);"
: "_unused_offset = " + type_name + ".pack(builder, " +
variable + "[_j]);";
code += " int _" + field_name + " = 0;\n";
code += " " + element_type_name + "[] " + variable + " = _o." +
get_field + "();\n";
code += " if (" + variable + " != null) {\n";
if (field.value.type.struct_def != nullptr) {
code += " int _unused_offset = 0;\n";
}
code += " " + namer_.Method("start", field) +
"Vector(builder, " + variable + ".length);\n";
code += " for (int _j = " + variable +
".length - 1; _j >=0; _j--) { ";
code += pack_method + "}\n";
code += " _" + field_name + " = builder.endVector();\n";
code += " }\n";
}
break;
}
case BASE_TYPE_ARRAY: {
if (field.value.type.struct_def != nullptr) {
std::vector<FieldArrayLength> array_lengths;
FieldArrayLength tmp_array_length = {
field.name,
field.value.type.fixed_length,
};
array_lengths.push_back(tmp_array_length);
GenStructPackDecl_ObjectAPI(*field.value.type.struct_def,
array_lengths, code);
} else {
code += " " +
GenTypeGet_ObjectAPI(field.value.type, false, true) + " _" +
field_name + " = _o." + get_field + "();\n";
}
break;
}
case BASE_TYPE_UNION: {
code += " " +
GenTypeBasic(DestinationType(
field.value.type.enum_def->underlying_type, false)) +
" _" + field_name + "Type = _o." + get_field +
"() == null ? " +
Prefixed(namer_.NamespacedType(*field.value.type.enum_def)) +
".NONE : " + "_o." + get_field + "().getType();\n";
code += " " + GenOffsetType() + " _" + field_name + " = _o." +
get_field + "() == null ? 0 : " +
Prefixed(namer_.NamespacedType(*field.value.type.enum_def)) +
"Union.pack(builder, _o." + get_field + "());\n";
break;
}
default: break;
}
}
if (struct_has_create) {
// Create
code += " return " +
namer_.LegacyJavaMethod2("create", struct_def, "") + "(\n";
code += " builder";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
if (field.deprecated) continue;
const auto field_name = namer_.Field(field);
const auto get_field = namer_.Method("get", field);
switch (field.value.type.base_type) {
case BASE_TYPE_STRUCT: {
if (struct_def.fixed) {
GenStructPackCall_ObjectAPI(*field.value.type.struct_def, code,
" _" + field_name + "_");
} else {
code += ",\n";
if (field.value.type.struct_def->fixed) {
if (opts.generate_object_based_api)
code += " _o." + field_name;
else
// Seems like unreachable code
code += " " + GenTypeGet(field.value.type) +
".Pack(builder, _o." + field_name + ")";
} else {
code += " _" + field_name;
}
}
break;
}
case BASE_TYPE_ARRAY: {
if (field.value.type.struct_def != nullptr) {
GenStructPackCall_ObjectAPI(*field.value.type.struct_def, code,
" _" + field_name + "_");
} else {
code += ",\n";
code += " _" + field_name;
}
break;
}
case BASE_TYPE_UNION: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_UTYPE: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_STRING: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_VECTOR: {
code += ",\n";
code += " _" + field_name;
break;
}
default: // scalar
code += ",\n";
code += " _o." + get_field + "()";
break;
}
}
code += ");\n";
} else {
// Start, End
code += " " + namer_.LegacyJavaMethod2("start", struct_def, "") +
"(builder);\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
if (field.deprecated) continue;
const auto arg = "_" + namer_.Variable(field);
const auto get_field = namer_.Method("get", field);
const auto add_field = namer_.Method("add", field);
switch (field.value.type.base_type) {
case BASE_TYPE_STRUCT: {
if (field.value.type.struct_def->fixed) {
code += " " + add_field + "(builder, " +
GenTypeGet(field.value.type) + ".pack(builder, _o." +
get_field + "()));\n";
} else {
code += " " + add_field + "(builder, " + arg + ");\n";
}
break;
}
case BASE_TYPE_STRING: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_VECTOR: {
code += " " + add_field + "(builder, " + arg + ");\n";
break;
}
case BASE_TYPE_UTYPE: break;
case BASE_TYPE_UNION: {
code += " " + add_field + "Type(builder, " + arg + "Type);\n";
code += " " + add_field + "(builder, " + arg + ");\n";
break;
}
// scalar
default: {
if (field.IsScalarOptional()) {
code += " if (_o." + get_field + "() != null) { " + add_field +
"(builder, _o." + get_field + "()); }\n";
} else {
code +=
" " + add_field + "(builder, _o." + get_field + "());\n";
}
break;
}
}
}
code += " return " + namer_.LegacyJavaMethod2("end", struct_def, "") +
"(builder);\n";
}
code += " }\n";
}
void GenStructPackDecl_ObjectAPI(const StructDef &struct_def,
std::vector<FieldArrayLength> &array_lengths,
std::string &code) const {
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
const FieldDef &field = **it;
const bool is_array = IsArray(field.value.type);
const Type &field_type =
is_array ? field.value.type.VectorType() : field.value.type;
FieldArrayLength tmp_array_length = {
field.name,
field_type.fixed_length,
};
array_lengths.push_back(tmp_array_length);
if (field_type.struct_def != nullptr) {
GenStructPackDecl_ObjectAPI(*field_type.struct_def, array_lengths,
code);
} else {
std::vector<FieldArrayLength> array_only_lengths;
for (size_t i = 0; i < array_lengths.size(); ++i) {
if (array_lengths[i].length > 0) {
array_only_lengths.push_back(array_lengths[i]);
}
}
std::string name;
for (size_t i = 0; i < array_lengths.size(); ++i) {
name += "_" + namer_.Variable(array_lengths[i].name);
}
code += " " + GenTypeBasic(field_type);
if (array_only_lengths.size() > 0) {
for (size_t i = 0; i < array_only_lengths.size(); ++i) {
code += "[]";
}
code += " " + name + " = ";
code += "new " + GenTypeBasic(field_type) + "[";
for (size_t i = 0; i < array_only_lengths.size(); ++i) {
if (i != 0) { code += "]["; }
code += NumToString(array_only_lengths[i].length);
}
code += "];\n";
code += " ";
// initialize array
for (size_t i = 0; i < array_only_lengths.size(); ++i) {
auto idx = "idx" + NumToString(i);
code += "for (int " + idx + " = 0; " + idx + " < " +
NumToString(array_only_lengths[i].length) + "; ++" + idx +
") {";
}
for (size_t i = 0; i < array_only_lengths.size(); ++i) {
auto idx = "idx" + NumToString(i);
if (i == 0) {
code += name + "[" + idx;
} else {
code += "][" + idx;
}
}
code += "] = _o";
for (size_t i = 0, j = 0; i < array_lengths.size(); ++i) {
code += "." + namer_.Method("get", array_lengths[i].name) + "()";
if (array_lengths[i].length <= 0) continue;
code += "[idx" + NumToString(j++) + "]";
}
code += ";";
for (size_t i = 0; i < array_only_lengths.size(); ++i) {
code += "}";
}
} else {
code += " " + name + " = ";
code += SourceCast(field_type);
code += "_o";
for (size_t i = 0; i < array_lengths.size(); ++i) {
code += "." + namer_.Method("get", array_lengths[i].name) + "()";
}
code += ";";
}
code += "\n";
}
array_lengths.pop_back();
}
}
void GenStructPackCall_ObjectAPI(const StructDef &struct_def,
std::string &code,
std::string prefix) const {
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
auto &field = **it;
const auto &field_type = field.value.type;
if (field_type.struct_def != nullptr) {
GenStructPackCall_ObjectAPI(*field_type.struct_def, code,
prefix + namer_.Field(field) + "_");
} else {
code += ",\n";
code += prefix + namer_.Field(field);
}
}
}
std::string ConvertPrimitiveTypeToObjectWrapper_ObjectAPI(
const std::string &type_name) const {
if (type_name == "boolean")
return "Boolean";
else if (type_name == "byte")
return "Byte";
else if (type_name == "char")
return "Character";
else if (type_name == "short")
return "Short";
else if (type_name == "int")
return "Integer";
else if (type_name == "long")
return "Long";
else if (type_name == "float")
return "Float";
else if (type_name == "double")
return "Double";
return type_name;
}
std::string GenTypeGet_ObjectAPI(const flatbuffers::Type &type,
bool vectorelem,
bool wrap_in_namespace) const {
auto type_name = GenTypeNameDest(type);
// Replace to ObjectBaseAPI Type Name
switch (type.base_type) {
case BASE_TYPE_STRUCT: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_VECTOR: {
if (type.struct_def != nullptr) {
auto type_name_length = type.struct_def->name.length();
auto new_type_name = namer_.ObjectType(*type.struct_def);
type_name.replace(type_name.length() - type_name_length,
type_name_length, new_type_name);
} else if (type.element == BASE_TYPE_UNION) {
if (wrap_in_namespace) {
type_name =
Prefixed(namer_.NamespacedType(*type.enum_def)) + "Union";
} else {
type_name = namer_.Type(*type.enum_def) + "Union";
}
}
break;
}
case BASE_TYPE_UNION: {
if (wrap_in_namespace) {
type_name = Prefixed(namer_.NamespacedType(*type.enum_def)) + "Union";
} else {
type_name = namer_.Type(*type.enum_def) + "Union";
}
break;
}
default: break;
}
if (vectorelem) { return type_name; }
switch (type.base_type) {
case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_VECTOR: {
type_name = type_name + "[]";
break;
}
default: break;
}
return type_name;
}
std::string GenConcreteTypeGet_ObjectAPI(
const flatbuffers::Type &type) const {
auto type_name = GenTypeNameDest(type);
// Replace to ObjectBaseAPI Type Name
switch (type.base_type) {
case BASE_TYPE_STRUCT: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_VECTOR: {
if (type.struct_def != nullptr) {
auto type_name_length = type.struct_def->name.length();
auto new_type_name = namer_.ObjectType(*type.struct_def);
type_name.replace(type_name.length() - type_name_length,
type_name_length, new_type_name);
} else if (type.element == BASE_TYPE_UNION) {
type_name = Prefixed(namer_.NamespacedType(*type.enum_def)) + "Union";
}
break;
}
case BASE_TYPE_UNION: {
type_name = Prefixed(namer_.NamespacedType(*type.enum_def)) + "Union";
break;
}
default: break;
}
switch (type.base_type) {
case BASE_TYPE_ARRAY: FLATBUFFERS_FALLTHROUGH(); // fall thru
case BASE_TYPE_VECTOR: {
type_name = type_name + "[]";
break;
}
default: break;
}
return type_name;
}
void GenStruct_ObjectAPI(const StructDef &struct_def,
std::string &code) const {
if (struct_def.generated) return;
if (struct_def.attributes.Lookup("private")) {
// For Java, we leave the enum unmarked to indicate package-private
} else {
code += "public ";
}
const auto class_name = namer_.ObjectType(struct_def);
code += "class " + class_name;
code += " {\n";
// Generate Properties
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
const auto &field = **it;
if (field.deprecated) continue;
if (field.value.type.base_type == BASE_TYPE_UTYPE) continue;
if (field.value.type.element == BASE_TYPE_UTYPE) continue;
auto type_name = GenTypeGet_ObjectAPI(field.value.type, false, true);
if (field.IsScalarOptional())
type_name = ConvertPrimitiveTypeToObjectWrapper_ObjectAPI(type_name);
const auto field_name = namer_.Field(field);
code += " private " + type_name + " " + field_name + ";\n";
}
// Generate Java getters and setters
code += "\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
const auto &field = **it;
if (field.deprecated) continue;
if (field.value.type.base_type == BASE_TYPE_UTYPE) continue;
if (field.value.type.element == BASE_TYPE_UTYPE) continue;
const auto field_name = namer_.Field(field);
const auto get_field = namer_.Method("get", field);
auto type_name = GenTypeGet_ObjectAPI(field.value.type, false, true);
if (field.IsScalarOptional())
type_name = ConvertPrimitiveTypeToObjectWrapper_ObjectAPI(type_name);
code += " public " + type_name + " " + get_field + "() { return " +
field_name + "; }\n\n";
std::string array_validation = "";
if (field.value.type.base_type == BASE_TYPE_ARRAY) {
array_validation =
"if (" + field_name + " != null && " + field_name +
".length == " + NumToString(field.value.type.fixed_length) + ") ";
}
code += " public void " + namer_.Method("set", field) + "(" + type_name +
" " + field_name + ") { " + array_validation + "this." +
field_name + " = " + field_name + "; }\n\n";
}
// Generate Constructor
code += "\n";
code += " public " + class_name + "() {\n";
for (auto it = struct_def.fields.vec.begin();
it != struct_def.fields.vec.end(); ++it) {
const auto &field = **it;
if (field.deprecated) continue;
if (field.value.type.base_type == BASE_TYPE_UTYPE) continue;
if (field.value.type.element == BASE_TYPE_UTYPE) continue;
const auto get_field = namer_.Method("get", field);
code += " this." + namer_.Field(field) + " = ";
const auto type_name =
GenTypeGet_ObjectAPI(field.value.type, false, true);
if (IsScalar(field.value.type.base_type)) {
if (field.IsScalarOptional()) {
code += "null;\n";
} else {
code += GenDefaultValue(field) + ";\n";
}
} else {
switch (field.value.type.base_type) {
case BASE_TYPE_STRUCT: {
if (IsStruct(field.value.type)) {
code += "new " + type_name + "();\n";
} else {
code += "null;\n";
}
break;
}
case BASE_TYPE_ARRAY: {
code += "new " + type_name.substr(0, type_name.length() - 1) +
NumToString(field.value.type.fixed_length) + "];\n";
break;
}
default: {
code += "null;\n";
break;
}
}
}
}
code += " }\n";
if (parser_.root_struct_def_ == &struct_def) {
const std::string struct_type = namer_.Type(struct_def);
code += " public static " + class_name +
" deserializeFromBinary(byte[] fbBuffer) {\n";
code += " return " + struct_type + "." +
namer_.LegacyJavaMethod2("getRootAs", struct_def, "") +
"(ByteBuffer.wrap(fbBuffer)).unpack();\n";
code += " }\n";
code += " public byte[] serializeToBinary() {\n";
code += " FlatBufferBuilder fbb = new FlatBufferBuilder();\n";
code += " " + struct_type + "." +
namer_.LegacyJavaMethod2("finish", struct_def, "Buffer") +
"(fbb, " + struct_type + ".pack(fbb, this));\n";
code += " return fbb.sizedByteArray();\n";
code += " }\n";
}
code += "}\n\n";
}
// This tracks the current namespace used to determine if a type need to be
// prefixed by its namespace
const Namespace *cur_name_space_;
const IdlNamer namer_;
private:
std::string Prefixed(const std::string &str) const {
return package_prefix_ + str;
}
std::string package_prefix_;
Namespace package_prefix_ns_;
};
} // namespace java
static bool GenerateJava(const Parser &parser, const std::string &path,
const std::string &file_name) {
java::JavaGenerator generator(parser, path, file_name,
parser.opts.java_package_prefix);
return generator.generate();
}
namespace {
class JavaCodeGenerator : public CodeGenerator {
public:
Status GenerateCode(const Parser &parser, const std::string &path,
const std::string &filename) override {
if (!GenerateJava(parser, path, filename)) { return Status::ERROR; }
return Status::OK;
}
Status GenerateCode(const uint8_t *, int64_t,
const CodeGenOptions &) override {
return Status::NOT_IMPLEMENTED;
}
Status GenerateMakeRule(const Parser &parser, const std::string &path,
const std::string &filename,
std::string &output) override {
output = JavaCSharpMakeRule(true, parser, path, filename);
return Status::OK;
}
Status GenerateGrpcCode(const Parser &parser, const std::string &path,
const std::string &filename) override {
if (!GenerateJavaGRPC(parser, path, filename)) { return Status::ERROR; }
return Status::OK;
}
Status GenerateRootFile(const Parser &parser,
const std::string &path) override {
(void)parser;
(void)path;
return Status::NOT_IMPLEMENTED;
}
bool IsSchemaOnly() const override { return true; }
bool SupportsBfbsGeneration() const override { return false; }
bool SupportsRootFileGeneration() const override { return false; }
IDLOptions::Language Language() const override { return IDLOptions::kJava; }
std::string LanguageName() const override { return "Java"; }
};
} // namespace
std::unique_ptr<CodeGenerator> NewJavaCodeGenerator() {
return std::unique_ptr<JavaCodeGenerator>(new JavaCodeGenerator());
}
} // namespace flatbuffers
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