dotnet-dynamic-query/PoweredSoft.DynamicQuery/QueryHandlerBase.cs

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using PoweredSoft.DynamicQuery.Core;
using PoweredSoft.DynamicLinq;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Text;
using System.Threading.Tasks;
using PoweredSoft.DynamicLinq.Fluent;
using PoweredSoft.DynamicQuery.Extensions;
namespace PoweredSoft.DynamicQuery
{
public abstract class QueryHandlerBase : IInterceptableQueryHandler
{
protected List<IQueryInterceptor> Interceptors { get; } = new List<IQueryInterceptor>();
protected IQueryCriteria Criteria { get; set; }
protected IQueryable QueryableAtStart { get; private set; }
protected IQueryable CurrentQueryable { get; set; }
protected Type QueryableUnderlyingType => QueryableAtStart.ElementType;
protected bool HasGrouping => Criteria.Groups?.Any() == true;
protected bool HasPaging => Criteria.PageSize.HasValue && Criteria.PageSize > 0;
protected virtual void Reset(IQueryable queryable, IQueryCriteria criteria)
{
Criteria = criteria ?? throw new ArgumentNullException("criteria");
QueryableAtStart = queryable ?? throw new ArgumentNullException("queryable");
CurrentQueryable = QueryableAtStart;
}
protected virtual void CommonBeforeExecute<TSource>()
{
ApplyIncludeStrategyInterceptors<TSource>();
ApplyBeforeFilterInterceptors<TSource>();
ApplyFilters<TSource>();
}
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public virtual void AddInterceptor(IQueryInterceptor interceptor)
{
if (interceptor == null) throw new ArgumentNullException("interceptor");
if (!Interceptors.Contains(interceptor))
Interceptors.Add(interceptor);
}
protected virtual IGroup InterceptGroup<TSource>(IGroup group)
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{
var ret = Interceptors
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.Where(t => t is IGroupInterceptor)
.Cast<IGroupInterceptor>()
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.Aggregate(group, (prev, inter) => inter.InterceptGroup(prev));
return ret;
}
protected virtual void ApplyPaging<TSource>()
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{
if (!HasPaging)
return;
var q = (IQueryable<TSource>) CurrentQueryable;
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var skip = ((Criteria.Page ?? 1) - 1) * Criteria.PageSize.Value;
CurrentQueryable = q.Skip(skip).Take(Criteria.PageSize.Value);
}
protected virtual void ApplySorting<TSource>()
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{
if (Criteria.Sorts?.Any() != true)
{
ApplyNoSortInterceptor<TSource>();
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return;
}
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bool isAppending = false;
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Criteria.Sorts.ForEach(sort =>
{
var transformedSort = InterceptSort<TSource>(sort);
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if (transformedSort.Count == 0)
return;
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transformedSort.ForEach(ts =>
{
CurrentQueryable = CurrentQueryable.OrderBy(ts.Path, ts.Ascending == false ? QueryOrderByDirection.Descending : QueryOrderByDirection.Ascending, isAppending);
isAppending = true;
});
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});
}
protected DynamicClass FindMatchingAggregateResult<TRecord>(List<List<DynamicClass>> aggregateResults, List<IGroup> groups, List<IGroupQueryResult<TRecord>> groupResults)
{
var groupIndex = groupResults.Count - 1;
var aggregateLevel = aggregateResults[groupIndex];
var ret = aggregateLevel.FirstOrDefault(al =>
{
for (var i = 0; i < groups.Count; i++)
{
if (!al.GetDynamicPropertyValue($"Key_{i}").Equals(groupResults[i].GroupValue))
return false;
}
return true;
});
return ret;
}
protected virtual IQueryable CreateFetchAggregateSelectExpression<TSource>(IGroup finalGroup, List<IGroup> previousGroups)
{
var groupExpression = CurrentQueryable.GroupBy(QueryableUnderlyingType, gb =>
{
var groupKeyIndex = -1;
previousGroups.ForEach(pg => gb.Path(pg.Path, $"Key_{++groupKeyIndex}"));
gb.Path(finalGroup.Path, $"Key_{++groupKeyIndex}");
});
var selectExpression = groupExpression.Select(sb =>
{
var groupKeyIndex = -1;
previousGroups.ForEach(pg => sb.Key($"Key_{++groupKeyIndex}", $"Key_{groupKeyIndex}"));
sb.Key($"Key_{++groupKeyIndex}", $"Key_{groupKeyIndex}");
Criteria.Aggregates.ForEach((a, ai) =>
{
var fa = InterceptAggregate<TSource>(a);
var selectType = ResolveSelectFrom(fa.Type);
sb.Aggregate(fa.Path, selectType, $"Agg_{ai}");
});
});
return selectExpression;
}
protected virtual List<IAggregateResult> MaterializeCalculateTotalAggregateResult(DynamicClass aggregateResult)
{
var ret = new List<IAggregateResult>();
Criteria.Aggregates.ForEach((a, index) =>
{
ret.Add(new AggregateResult()
{
Path = a.Path,
Type = a.Type,
Value = aggregateResult?.GetDynamicPropertyValue($"Agg_{index}")
});
});
return ret;
}
protected virtual IQueryable CreateTotalAggregateSelectExpression<TSource>(IQueryable queryableAfterFilters)
{
var groupExpression = queryableAfterFilters.EmptyGroupBy(QueryableUnderlyingType);
var selectExpression = groupExpression.Select(sb =>
{
Criteria.Aggregates.ForEach((a, index) =>
{
var fa = InterceptAggregate<TSource>(a);
var selectType = ResolveSelectFrom(fa.Type);
sb.Aggregate(fa.Path, selectType, $"Agg_{index}");
});
});
return selectExpression;
}
protected virtual void CalculatePageCount(IQueryExecutionResultPaging result)
{
if (!HasPaging)
return;
if (result.TotalRecords < Criteria.PageSize)
result.NumberOfPages = 1;
else
result.NumberOfPages = result.TotalRecords / Criteria.PageSize + (result.TotalRecords % Criteria.PageSize != 0 ? 1 : 0);
}
protected virtual IAggregate InterceptAggregate<TSource>(IAggregate aggregate)
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{
var ret = Interceptors
.Where(t => t is IAggregateInterceptor)
.Cast<IAggregateInterceptor>()
.Aggregate(aggregate, (prev, inter) => inter.InterceptAggregate(prev));
return ret;
}
protected virtual async Task<List<TRecord>> InterceptConvertTo<TSource, TRecord>(List<TSource> entities)
{
await AfterEntityReadInterceptors(entities);
var ret = new List<TRecord>();
for (var i = 0; i < entities.Count; i++)
ret.Add(InterceptConvertToObject<TSource, TRecord>(entities[i]));
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var pairs = entities.Select((t, index) => Tuple.Create(t, ret[index])).ToList();
await AfterReadInterceptors<TSource, TRecord>(pairs);
return ret;
}
protected virtual async Task AfterEntityReadInterceptors<TSource>(List<TSource> entities)
{
Interceptors
.Where(t => t is IAfterReadEntityInterceptor<TSource>)
.Cast<IAfterReadEntityInterceptor<TSource>>()
.ToList()
.ForEach(t => t.AfterReadEntity(entities));
var asyncInterceptors = Interceptors.Where(t => t is IAfterReadEntityInterceptorAsync<TSource>).Cast<IAfterReadEntityInterceptorAsync<TSource>>();
foreach (var interceptor in asyncInterceptors)
await interceptor.AfterReadEntityAsync(entities);
}
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protected virtual async Task AfterReadInterceptors<TSource, TRecord>(List<Tuple<TSource, TRecord>> pairs)
{
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var objPair = pairs.Select(t => Tuple.Create(t.Item1, (object)t.Item2)).ToList();
Interceptors
.Where(t => t is IAfterReadInterceptor<TSource>)
.Cast<IAfterReadInterceptor<TSource>>()
.ToList()
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.ForEach(t => t.AfterRead(objPair));
var asyncInterceptors = Interceptors.Where(t => t is IAfterReadInterceptorAsync<TSource>).Cast<IAfterReadInterceptorAsync<TSource>>();
foreach (var interceptor in asyncInterceptors)
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await interceptor.AfterReadAsync(objPair);
var asyncInterceptors2 = Interceptors.Where(t => t is IAfterReadInterceptorAsync<TSource, TRecord>).Cast<IAfterReadInterceptorAsync<TSource, TRecord>>();
foreach (var interceptor in asyncInterceptors2)
await interceptor.AfterReadAsync(pairs);
}
protected virtual TRecord InterceptConvertToObject<TSource, TRecord>(object o)
{
o = Interceptors
.Where(t => t is IQueryConvertInterceptor)
.Cast<IQueryConvertInterceptor>()
.Aggregate(o, (prev, interceptor) => interceptor.InterceptResultTo(prev));
o = Interceptors
.Where(t => t is IQueryConvertInterceptor<TSource>)
.Cast<IQueryConvertInterceptor<TSource>>()
.Aggregate(o, (prev, interceptor) =>
{
if (prev is TSource)
return interceptor.InterceptResultTo((TSource)prev);
return o;
});
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o = Interceptors
.Where(t => t is IQueryConvertInterceptor<TSource, TRecord>)
.Cast<IQueryConvertInterceptor<TSource, TRecord>>()
.Aggregate(o, (prev, interceptor) =>
{
if (prev is TSource)
return interceptor.InterceptResultTo((TSource)prev);
return o;
});
return (TRecord)o;
}
protected virtual List<ISort> InterceptSort<TSource>(ISort sort)
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{
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var original = new List<ISort>()
{
sort
};
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var ret = Interceptors
.Where(t => t is ISortInterceptor)
.Cast<ISortInterceptor>()
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.Aggregate(original as IEnumerable<ISort>, (prev, inter) => inter.InterceptSort(prev))
.Distinct();
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return ret.ToList();
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}
protected virtual void ApplyNoSortInterceptor<TSource>()
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{
CurrentQueryable = Interceptors.Where(t => t is INoSortInterceptor)
.Cast<INoSortInterceptor>()
.Aggregate(CurrentQueryable, (prev, interceptor) => interceptor.InterceptNoSort(Criteria, prev));
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CurrentQueryable = Interceptors.Where(t => t is INoSortInterceptor<TSource>)
.Cast<INoSortInterceptor<TSource>>()
.Aggregate((IQueryable<TSource>)CurrentQueryable, (prev, interceptor) => interceptor.InterceptNoSort(Criteria, prev));
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}
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protected virtual SelectTypes? ResolveSelectFromOrDefault(AggregateType aggregateType) => aggregateType.SelectType();
protected virtual ConditionOperators? ResolveConditionOperatorFromOrDefault(FilterType filterType) => filterType.ConditionOperator();
protected virtual ConditionOperators ResolveConditionOperatorFrom(FilterType filterType)
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{
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var ret = ResolveConditionOperatorFromOrDefault(filterType);
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if (ret == null)
throw new NotSupportedException($"{filterType} is not supported");
return ret.Value;
}
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protected virtual SelectTypes ResolveSelectFrom(AggregateType aggregateType)
{
var ret = ResolveSelectFromOrDefault(aggregateType);
if (ret == null)
throw new NotSupportedException($"{aggregateType} is not supported");
return ret.Value;
}
protected virtual void ApplyFilters<TSource>()
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{
if (true != Criteria.Filters?.Any())
return;
CurrentQueryable = CurrentQueryable.Query(whereBuilder =>
{
Criteria.Filters.ForEach(filter => ApplyFilter<TSource>(whereBuilder, filter));
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});
}
protected virtual void ApplyFilter<TSource>(WhereBuilder whereBuilder, IFilter filter)
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{
var transformedFilter = InterceptFilter<TSource>(filter);
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if (transformedFilter is ISimpleFilter)
ApplySimpleFilter<TSource>(whereBuilder, transformedFilter as ISimpleFilter);
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else if (transformedFilter is ICompositeFilter)
AppleCompositeFilter<TSource>(whereBuilder, transformedFilter as ICompositeFilter);
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else
throw new NotSupportedException();
}
protected virtual void AppleCompositeFilter<TSource>(WhereBuilder whereBuilder, ICompositeFilter filter)
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{
whereBuilder.SubQuery(subWhereBuilder => filter.Filters.ForEach(subFilter => ApplyFilter<TSource>(subWhereBuilder, subFilter)), filter.And == true);
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}
protected virtual void ApplySimpleFilter<TSource>(WhereBuilder whereBuilder, ISimpleFilter filter)
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{
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var resolvedConditionOperator = ResolveConditionOperatorFrom(filter.Type);
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whereBuilder.Compare(filter.Path, resolvedConditionOperator, filter.Value, and: filter.And == true);
}
protected virtual IFilter InterceptFilter<TSource>(IFilter filter)
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{
var ret = Interceptors.Where(t => t is IFilterInterceptor)
.Cast<IFilterInterceptor>()
.Aggregate(filter, (previousFilter, interceptor) => interceptor.InterceptFilter(previousFilter));
return ret;
}
protected virtual void ApplyIncludeStrategyInterceptors<TSource>()
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{
CurrentQueryable = Interceptors
.Where(t => t is IIncludeStrategyInterceptor)
.Cast<IIncludeStrategyInterceptor>()
.Aggregate(CurrentQueryable, (prev, interceptor) => interceptor.InterceptIncludeStrategy(Criteria, prev));
CurrentQueryable = Interceptors
.Where(t => t is IIncludeStrategyInterceptor<TSource>)
.Cast<IIncludeStrategyInterceptor<TSource>>()
.Aggregate((IQueryable<TSource>)CurrentQueryable, (prev, interceptor) => interceptor.InterceptIncludeStrategy(Criteria, prev));
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}
protected virtual void ApplyBeforeFilterInterceptors<TSource>()
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{
CurrentQueryable = Interceptors
.Where(t => t is IBeforeQueryFilterInterceptor)
.Cast<IBeforeQueryFilterInterceptor>()
.Aggregate(CurrentQueryable, (prev, interceptor) => interceptor.InterceptBeforeFiltering(Criteria, prev));
CurrentQueryable = Interceptors
.Where(t => t is IBeforeQueryFilterInterceptor<TSource>)
.Cast<IBeforeQueryFilterInterceptor<TSource>>()
.Aggregate((IQueryable<TSource>)CurrentQueryable, (prev, interceptor) => interceptor.InterceptBeforeFiltering(Criteria, prev));
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}
protected virtual List<IGroupQueryResult<TRecord>> RecursiveRegroup<TSource, TRecord>(List<DynamicClass> groupRecords, List<List<DynamicClass>> aggregateResults, IGroup group, List<(List<TSource> entities, IGroupQueryResult<TRecord> group)> lastLists, List<IGroupQueryResult<TRecord>> parentGroupResults = null)
{
var groupIndex = Criteria.Groups.IndexOf(group);
var isLast = Criteria.Groups.Last() == group;
var groups = Criteria.Groups.Take(groupIndex + 1).ToList();
var hasAggregates = Criteria.Aggregates.Any();
var ret = groupRecords
.GroupBy(gk => gk.GetDynamicPropertyValue($"Key_{groupIndex}"))
.Select(t =>
{
var groupResult = new GroupQueryResult<TRecord>();
// group results.
List<IGroupQueryResult<TRecord>> groupResults;
if (parentGroupResults == null)
groupResults = new List<IGroupQueryResult<TRecord>> { groupResult };
else
groupResults = parentGroupResults.Union(new[] { groupResult }).ToList();
groupResult.GroupPath = group.Path;
groupResult.GroupValue = t.Key;
if (hasAggregates)
{
var matchingAggregate = FindMatchingAggregateResult(aggregateResults, groups, groupResults);
if (matchingAggregate == null)
Debugger.Break();
groupResult.Aggregates = new List<IAggregateResult>();
Criteria.Aggregates.ForEach((a, ai) =>
{
var key = $"Agg_{ai}";
var aggregateResult = new AggregateResult
{
Path = a.Path,
Type = a.Type,
Value = matchingAggregate.GetDynamicPropertyValue(key)
};
groupResult.Aggregates.Add(aggregateResult);
});
}
if (isLast)
{
var entities = t.SelectMany(t2 => t2.GetDynamicPropertyValue<List<TSource>>("Records")).ToList();
var tuple = (entities, groupResult);
groupResult.Data = new List<TRecord>();
lastLists.Add(tuple);
}
else
{
groupResult.SubGroups = RecursiveRegroup<TSource, TRecord>(t.ToList(), aggregateResults, Criteria.Groups[groupIndex + 1], lastLists, groupResults);
}
return groupResult;
})
.AsEnumerable<IGroupQueryResult<TRecord>>()
.ToList();
return ret;
}
protected virtual async Task QueryInterceptToGrouped<TSource, TRecord>(List<(List<TSource> entities, IGroupQueryResult<TRecord> group)> lists)
{
var entities = lists.SelectMany(t => t.entities).ToList();
await AfterEntityReadInterceptors(entities);
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var pairs = new List<Tuple<TSource, TRecord>>();
lists.ForEach(innerList =>
{
for (var i = 0; i < innerList.entities.Count; i++)
{
var entity = innerList.entities[i];
var convertedObject = InterceptConvertToObject<TSource, TRecord>(entity);
innerList.group.Data.Add(convertedObject);
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pairs.Add(Tuple.Create(entity, convertedObject));
}
});
await AfterReadInterceptors<TSource, TRecord>(pairs);
}
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}
}