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collection handling.

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and auto null checking if enabled.
This commit is contained in:
David 2018-02-12 21:27:09 -06:00
parent babce13871
commit e3660877ef
5 changed files with 148 additions and 31 deletions
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86
PoweredSoft.DynamicLinq.Test/ComplexQueryTest.cs
View File

@ -99,6 +99,81 @@ namespace PoweredSoft.DynamicLinq.Test
Assert.IsTrue(second.Id == 1);
}
[TestMethod]
public void TestCreateFilterExpressionCheckNull()
{
var authors = new List<Author>()
{
new Author
{
Id = 1,
FirstName = "David",
LastName = "Lebee",
Posts = new List<Post>
{
new Post
{
Id = 1,
AuthorId = 1,
Title = "Match",
Content = "ABC",
Comments = new List<Comment>()
{
new Comment()
{
Id = 1,
DisplayName = "John Doe",
CommentText = "!@#$!@#!@#",
Email = "john.doe@me.com"
}
}
},
new Post
{
Id = 2,
AuthorId = 1,
Title = "Match",
Content = "ABC"
}
}
},
new Author
{
Id = 2,
FirstName = "Chuck",
LastName = "Norris",
Posts = new List<Post>
{
new Post
{
Id = 3,
AuthorId = 2,
Title = "Match",
Content = "ASD"
},
new Post
{
Id = 4,
AuthorId = 2,
Title = "DontMatch",
Content = "ASD"
}
}
}
};
// the query.
var query = authors.AsQueryable();
query = query.Query(qb =>
{
qb.NullChecking();
qb.And("Posts.Comments.Email", ConditionOperators.Equal, "john.doe@me.com", collectionHandling: QueryCollectionHandling.Any);
});
Assert.AreEqual(1, query.Count());
}
[TestMethod]
public void TestCreateFilterExpression()
{
@ -133,7 +208,8 @@ namespace PoweredSoft.DynamicLinq.Test
Id = 2,
AuthorId = 1,
Title = "Match",
Content = "ABC"
Content = "ABC",
Comments = new List<Comment>()
}
}
},
@ -150,6 +226,7 @@ namespace PoweredSoft.DynamicLinq.Test
AuthorId = 2,
Title = "Match",
Content = "ASD",
Comments = new List<Comment>()
},
new Post
{
@ -157,6 +234,7 @@ namespace PoweredSoft.DynamicLinq.Test
AuthorId = 2,
Title = "DontMatch",
Content = "ASD",
Comments = new List<Comment>()
}
}
}
@ -165,10 +243,12 @@ namespace PoweredSoft.DynamicLinq.Test
// the query.
var query = authors.AsQueryable();
var allExpression = QueryableHelpers.CreateFilterExpression<Author>("Posts.Title", ConditionOperators.Equal, "Match", QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionCondition.All);
var anyExpression = QueryableHelpers.CreateFilterExpression<Author>("Posts.Title", ConditionOperators.Equal, "Match", QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionCondition.Any);
var allExpression = QueryableHelpers.CreateFilterExpression<Author>("Posts.Title", ConditionOperators.Equal, "Match", QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling.All);
var anyExpression = QueryableHelpers.CreateFilterExpression<Author>("Posts.Title", ConditionOperators.Equal, "Match", QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling.Any);
var anyExpression2 = QueryableHelpers.CreateFilterExpression<Author>("Posts.Comments.Email", ConditionOperators.Equal, "John.doe@me.com", QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling.Any);
Assert.AreEqual(1, query.Count(allExpression));
Assert.AreEqual(2, query.Count(anyExpression));
Assert.AreEqual(1, query.Count(anyExpression2));
}
}
}

3
PoweredSoft.DynamicLinq/Constants.cs
View File

@ -10,6 +10,7 @@ namespace PoweredSoft.DynamicLinq
public enum ConditionOperators
{
Equal,
NotEqual,
GreaterThan,
GreaterThanOrEqual,
LessThan,
@ -25,7 +26,7 @@ namespace PoweredSoft.DynamicLinq
ConvertConstantToComparedPropertyOrField
}
public enum QueryCollectionCondition
public enum QueryCollectionHandling
{
Any,
All

31
PoweredSoft.DynamicLinq/Fluent/QueryBuilder.cs
View File

@ -15,6 +15,8 @@ namespace PoweredSoft.DynamicLinq.Fluent
public Type QueryableType { get; set; }
public bool IsNullCheckingEnabled { get; protected set; } = false;
public List<QueryBuilderFilter> Filters { get; protected set; } = new List<QueryBuilderFilter>();
public List<QueryBuilderSort> Sorts { get; protected set; } = new List<QueryBuilderSort>();
@ -24,9 +26,15 @@ namespace PoweredSoft.DynamicLinq.Fluent
Query = query;
}
public QueryBuilder<T> NullChecking(bool check = true)
{
IsNullCheckingEnabled = check;
return this;
}
public virtual QueryBuilder<T> Compare(string path, ConditionOperators conditionOperators, object value,
QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField,
bool and = true)
bool and = true, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
{
Filters.Add(new QueryBuilderFilter
{
@ -34,7 +42,8 @@ namespace PoweredSoft.DynamicLinq.Fluent
ConditionOperator = conditionOperators,
Path = path,
Value = value,
ConvertStrategy = convertStrategy
ConvertStrategy = convertStrategy,
CollectionHandling = collectionHandling
});
return this;
@ -55,6 +64,7 @@ namespace PoweredSoft.DynamicLinq.Fluent
{
// create query builder for same type.
var qb = new QueryBuilder<T>(Query);
qb.NullChecking(IsNullCheckingEnabled);
// callback.
subQuery(qb);
@ -69,11 +79,13 @@ namespace PoweredSoft.DynamicLinq.Fluent
return this;
}
public QueryBuilder<T> And(string path, ConditionOperators conditionOperator, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField)
=> Compare(path, conditionOperator, value, convertStrategy: convertStrategy, and: true);
public QueryBuilder<T> And(string path, ConditionOperators conditionOperator, object value,
QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
=> Compare(path, conditionOperator, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, and: true);
public QueryBuilder<T> Or(string path, ConditionOperators conditionOperator, object value, QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField)
=> Compare(path, conditionOperator, value, convertStrategy: convertStrategy, and: false);
public QueryBuilder<T> Or(string path, ConditionOperators conditionOperator, object value,
QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
=> Compare(path, conditionOperator, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, and: false);
public QueryBuilder<T> And(Action<QueryBuilder<T>> subQuery)
=> SubQuery(subQuery, true);
@ -189,9 +201,9 @@ namespace PoweredSoft.DynamicLinq.Fluent
else
{
if (filter.And)
temp = Expression.Lambda<Func<T, bool>>(Expression.And(temp.Body, innerExpression.Body), parameter);
temp = Expression.Lambda<Func<T, bool>>(Expression.AndAlso(temp.Body, innerExpression.Body), parameter);
else
temp = Expression.Lambda<Func<T, bool>>(Expression.Or(temp.Body, innerExpression.Body), parameter);
temp = Expression.Lambda<Func<T, bool>>(Expression.OrElse(temp.Body, innerExpression.Body), parameter);
}
});
@ -207,7 +219,8 @@ namespace PoweredSoft.DynamicLinq.Fluent
filter.Value,
filter.ConvertStrategy,
filter.CollectionHandling,
parameter: parameter
parameter: parameter,
nullChecking: IsNullCheckingEnabled
);
return ret;

2
PoweredSoft.DynamicLinq/Fluent/QueryBuilderFilter.cs
View File

@ -14,6 +14,6 @@ namespace PoweredSoft.DynamicLinq.Fluent
public bool And { get; set; }
public QueryConvertStrategy ConvertStrategy { get; set; }
public List<QueryBuilderFilter> Filters { get; set; } = new List<QueryBuilderFilter>();
public QueryCollectionCondition CollectionHandling { get; set; }
public QueryCollectionHandling CollectionHandling { get; set; }
}
}

57
PoweredSoft.DynamicLinq/Helpers/QueryableHelpers.cs
View File

@ -26,6 +26,8 @@ namespace PoweredSoft.DynamicLinq.Helpers
if (conditionOperator == ConditionOperators.Equal)
ret = Expression.Equal(member, constant);
else if (conditionOperator == ConditionOperators.NotEqual)
ret = Expression.NotEqual(member, constant);
else if (conditionOperator == ConditionOperators.GreaterThan)
ret = Expression.GreaterThan(member, constant);
else if (conditionOperator == ConditionOperators.GreaterThanOrEqual)
@ -119,8 +121,8 @@ namespace PoweredSoft.DynamicLinq.Helpers
return query;
}
internal static Expression InternalCreateFilterExpression(int recursionStep, Type type, ParameterExpression parameter, Expression current, List<string> parts,
ConditionOperators condition, object value, QueryConvertStrategy convertStrategy, QueryCollectionCondition collectionHandling)
internal static Expression InternalCreateFilterExpression(int recursionStep, Type type, ParameterExpression parameter, Expression current, List<string> parts,
ConditionOperators condition, object value, QueryConvertStrategy convertStrategy, QueryCollectionHandling collectionHandling, bool nullChecking)
{
var partStr = parts.First();
var isLast = parts.Count == 1;
@ -130,8 +132,9 @@ namespace PoweredSoft.DynamicLinq.Helpers
// TODO : maybe support that last part is collection but what do we do?
// not supported yet.
if (isLast && IsEnumerable(memberExpression))
throw new NotSupportedException("Last part must not be a collection");
if (isLast && IsEnumerable(memberExpression) && value != null)
throw new NotSupportedException("Can only compare collection to null");
// create the expression and return it.
if (isLast)
@ -141,30 +144,49 @@ namespace PoweredSoft.DynamicLinq.Helpers
var lambda = Expression.Lambda(filterExpression, parameter);
return lambda;
}
// null check.
Expression nullCheckExpression = null;
if (nullChecking)
nullCheckExpression = Expression.NotEqual(memberExpression, Expression.Constant(null));
if (IsEnumerable(memberExpression))
{
var listGenericArgumentType = memberExpression.Type.GetGenericArguments().First();
var innerParameter = Expression.Parameter(listGenericArgumentType, $"t{++recursionStep}");
var innerLambda = InternalCreateFilterExpression(recursionStep, listGenericArgumentType, innerParameter, innerParameter, parts.Skip(1).ToList(), condition, value, convertStrategy, collectionHandling);
var innerLambda = InternalCreateFilterExpression(recursionStep, listGenericArgumentType, innerParameter, innerParameter, parts.Skip(1).ToList(), condition, value, convertStrategy, collectionHandling, nullChecking);
// the collection method.
var collectionMethod = GetCollectionMethod(collectionHandling);
var genericMethod = collectionMethod.MakeGenericMethod(listGenericArgumentType);
var callResult = Expression.Call(genericMethod, memberExpression, innerLambda);
var expressionResult = Expression.Lambda(callResult, parameter);
return expressionResult;
}
// standard property or field.
return InternalCreateFilterExpression(recursionStep, type, parameter, memberExpression, parts.Skip(1).ToList(), condition, value, convertStrategy, collectionHandling);
if (nullCheckExpression != null)
{
var nullCheckResult = Expression.AndAlso(nullCheckExpression, callResult);
return Expression.Lambda(nullCheckResult, parameter);
}
return Expression.Lambda(callResult, parameter);
}
else
{
if (nullCheckExpression != null)
{
var pathExpr = InternalCreateFilterExpression(recursionStep, type, parameter, memberExpression, parts.Skip(1).ToList(), condition, value, convertStrategy, collectionHandling, nullChecking);
var nullCheckResult = Expression.AndAlso(nullCheckExpression, pathExpr);
return nullCheckResult;
}
return InternalCreateFilterExpression(recursionStep, type, parameter, memberExpression, parts.Skip(1).ToList(), condition, value, convertStrategy, collectionHandling, nullChecking);
}
}
public static MethodInfo GetCollectionMethod(QueryCollectionCondition collectionHandling)
public static MethodInfo GetCollectionMethod(QueryCollectionHandling collectionHandling)
{
if (collectionHandling == QueryCollectionCondition.All)
if (collectionHandling == QueryCollectionHandling.All)
return Constants.AllMethod;
else if (collectionHandling == QueryCollectionCondition.Any)
else if (collectionHandling == QueryCollectionHandling.Any)
return Constants.AnyMethod;
throw new NotSupportedException($"{collectionHandling} is not supported");
@ -174,14 +196,15 @@ namespace PoweredSoft.DynamicLinq.Helpers
ConditionOperators condition,
object value,
QueryConvertStrategy convertStrategy,
QueryCollectionCondition collectionHandling = QueryCollectionCondition.Any,
ParameterExpression parameter = null)
QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any,
ParameterExpression parameter = null,
bool nullChecking = false)
{
if (parameter == null)
parameter = Expression.Parameter(typeof(T), "t");
var parts = path.Split('.').ToList();
var result = InternalCreateFilterExpression(1, typeof(T), parameter, parameter, parts, condition, value, convertStrategy, collectionHandling);
var result = InternalCreateFilterExpression(1, typeof(T), parameter, parameter, parts, condition, value, convertStrategy, collectionHandling, nullChecking);
var ret = result as Expression<Func<T, bool>>;
return ret;
}