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CSHARP-2509: Support Dictionary.ContainsValue in LINQ queries.
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115 changes: 115 additions & 0 deletions
115
...sionTranslators/MethodTranslators/ContainsValueMethodToAggregationExpressionTranslator.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* Copyright 2010-present MongoDB Inc. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| using System.Linq.Expressions; | ||
| using System.Reflection; | ||
| using MongoDB.Bson.Serialization; | ||
| using MongoDB.Bson.Serialization.Options; | ||
| using MongoDB.Bson.Serialization.Serializers; | ||
| using MongoDB.Driver.Linq.Linq3Implementation.Ast.Expressions; | ||
|
|
||
| namespace MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.MethodTranslators | ||
| { | ||
| internal static class ContainsValueMethodToAggregationExpressionTranslator | ||
| { | ||
| // public methods | ||
| public static AggregationExpression Translate(TranslationContext context, MethodCallExpression expression) | ||
| { | ||
| var method = expression.Method; | ||
| var arguments = expression.Arguments; | ||
|
|
||
| if (IsContainsValueMethod(method)) | ||
| { | ||
| var dictionaryExpression = expression.Object; | ||
| var valueExpression = arguments[0]; | ||
|
|
||
| var dictionaryTranslation = ExpressionToAggregationExpressionTranslator.Translate(context, dictionaryExpression); | ||
| var dictionarySerializer = GetDictionarySerializer(expression, dictionaryTranslation); | ||
| var dictionaryRepresentation = dictionarySerializer.DictionaryRepresentation; | ||
|
|
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| var valueTranslation = ExpressionToAggregationExpressionTranslator.Translate(context, valueExpression); | ||
| var (valueBinding, valueAst) = AstExpression.UseVarIfNotSimple("value", valueTranslation.Ast); | ||
|
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||
| AstExpression ast; | ||
| switch (dictionaryRepresentation) | ||
| { | ||
| case DictionaryRepresentation.Document: | ||
| ast = AstExpression.Let( | ||
| var: valueBinding, | ||
| @in: AstExpression.Reduce( | ||
| input: AstExpression.ObjectToArray(dictionaryTranslation.Ast), | ||
| initialValue: false, | ||
| @in: AstExpression.Cond( | ||
| @if: AstExpression.Var("value"), | ||
| @then: true, | ||
| @else: AstExpression.Eq(AstExpression.GetField(AstExpression.Var("this"), "v"), valueAst)))); | ||
| break; | ||
|
|
||
| case DictionaryRepresentation.ArrayOfArrays: | ||
| ast = AstExpression.Let( | ||
| var: valueBinding, | ||
| @in: AstExpression.Reduce( | ||
| input: dictionaryTranslation.Ast, | ||
| initialValue: false, | ||
| @in: AstExpression.Cond( | ||
| @if: AstExpression.Var("value"), | ||
| @then: true, | ||
| @else: AstExpression.Eq(AstExpression.ArrayElemAt(AstExpression.Var("this"), 1), valueAst)))); | ||
| break; | ||
|
|
||
| case DictionaryRepresentation.ArrayOfDocuments: | ||
| ast = AstExpression.Let( | ||
| var: valueBinding, | ||
| @in: AstExpression.Reduce( | ||
| input: dictionaryTranslation.Ast, | ||
| initialValue: false, | ||
| @in: AstExpression.Cond( | ||
| @if: AstExpression.Var("value"), | ||
| @then: true, | ||
| @else: AstExpression.Eq(AstExpression.GetField(AstExpression.Var("this"), "v"), valueAst)))); | ||
| break; | ||
|
|
||
| default: | ||
| throw new ExpressionNotSupportedException(expression, because: $"ContainsValue is not supported when DictionaryRepresentation is: {dictionaryRepresentation}"); | ||
| } | ||
|
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| return new AggregationExpression(expression, ast, BooleanSerializer.Instance); | ||
| } | ||
|
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| throw new ExpressionNotSupportedException(expression); | ||
| } | ||
|
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| private static IBsonDictionarySerializer GetDictionarySerializer(Expression expression, AggregationExpression dictionaryTranslation) | ||
| { | ||
| if (dictionaryTranslation.Serializer is IBsonDictionarySerializer dictionarySerializer) | ||
| { | ||
| return dictionarySerializer; | ||
| } | ||
|
|
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| throw new ExpressionNotSupportedException(expression, because: $"class {dictionaryTranslation.Serializer.GetType().FullName} does not implement the IBsonDictionarySerializer interface"); | ||
| } | ||
|
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| private static bool IsContainsValueMethod(MethodInfo method) | ||
| { | ||
| return | ||
| !method.IsStatic && | ||
| method.IsPublic && | ||
| method.ReturnType == typeof(bool) && | ||
| method.Name == "ContainsValue" && | ||
| method.GetParameters() is var parameters && | ||
| parameters.Length == 1; | ||
| } | ||
| } | ||
| } |
84 changes: 84 additions & 0 deletions
84
.../ExpressionToFilterTranslators/MethodTranslators/ContainsValueMethodToFilterTranslator.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* Copyright 2010-present MongoDB Inc. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| using System.Linq.Expressions; | ||
| using System.Reflection; | ||
| using MongoDB.Bson.Serialization; | ||
| using MongoDB.Bson.Serialization.Options; | ||
| using MongoDB.Driver.Linq.Linq3Implementation.Ast.Filters; | ||
| using MongoDB.Driver.Linq.Linq3Implementation.Misc; | ||
| using MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToFilterTranslators.ToFilterFieldTranslators; | ||
|
|
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| namespace MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToFilterTranslators.MethodTranslators | ||
| { | ||
| internal static class ContainsValueMethodToFilterTranslator | ||
| { | ||
| public static AstFilter Translate(TranslationContext context, MethodCallExpression expression) | ||
| { | ||
| var method = expression.Method; | ||
| var arguments = expression.Arguments; | ||
|
|
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| if (IsContainsValueMethod(method)) | ||
| { | ||
| var dictionaryExpression = expression.Object; | ||
| var valueExpression = arguments[0]; | ||
|
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| var dictionaryField = ExpressionToFilterFieldTranslator.Translate(context, dictionaryExpression); | ||
| var dictionarySerializer = GetDictionarySerializer(expression, dictionaryField); | ||
| var dictionaryRepresentation = dictionarySerializer.DictionaryRepresentation; | ||
| var valueSerializer = dictionarySerializer.ValueSerializer; | ||
|
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| if (valueExpression is ConstantExpression constantValueExpression) | ||
| { | ||
| var valueField = AstFilter.Field("v", valueSerializer); | ||
| var value = constantValueExpression.Value; | ||
| var serializedValue = SerializationHelper.SerializeValue(valueSerializer, value); | ||
|
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| switch (dictionaryRepresentation) | ||
| { | ||
| case DictionaryRepresentation.ArrayOfDocuments: | ||
| return AstFilter.ElemMatch(dictionaryField, AstFilter.Eq(valueField, serializedValue)); | ||
|
|
||
| default: | ||
| throw new ExpressionNotSupportedException(expression, because: $"ContainsValue is not supported when DictionaryRepresentation is: {dictionaryRepresentation}"); | ||
| } | ||
| } | ||
| } | ||
|
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| throw new ExpressionNotSupportedException(expression); | ||
| } | ||
|
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| private static IBsonDictionarySerializer GetDictionarySerializer(Expression expression, AstFilterField field) | ||
| { | ||
| if (field.Serializer is IBsonDictionarySerializer dictionarySerializer) | ||
| { | ||
| return dictionarySerializer; | ||
| } | ||
|
|
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| throw new ExpressionNotSupportedException(expression, because: $"class {field.Serializer.GetType().FullName} does not implement the IBsonDictionarySerializer interface"); | ||
| } | ||
|
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| private static bool IsContainsValueMethod(MethodInfo method) | ||
| { | ||
| return | ||
| !method.IsStatic && | ||
| method.IsPublic && | ||
| method.ReturnType == typeof(bool) && | ||
| method.Name == "ContainsValue" && | ||
| method.GetParameters() is var parameters && | ||
| parameters.Length == 1; | ||
| } | ||
| } | ||
| } |
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