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Cosmos: translate string Contains, StartsWith, and EndsWith (dotnet#1…
…9563) Summary of changes - Adds initial StringMethodTranslator for Cosmos provider. - Translates Contains, StartsWith, and EndsWith Addresses part of dotnet#16143
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81
src/EFCore.Cosmos/Query/Internal/StringMethodTranslator.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| // Copyright (c) .NET Foundation. All rights reserved. | ||
| // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. | ||
|
|
||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Reflection; | ||
| using JetBrains.Annotations; | ||
| using Microsoft.EntityFrameworkCore.Utilities; | ||
|
|
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| namespace Microsoft.EntityFrameworkCore.Cosmos.Query.Internal | ||
| { | ||
| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public class StringMethodTranslator : IMethodCallTranslator | ||
| { | ||
| private static readonly MethodInfo _containsMethodInfo | ||
| = typeof(string).GetRuntimeMethod(nameof(string.Contains), new[] { typeof(string) }); | ||
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| private static readonly MethodInfo _startsWithMethodInfo | ||
| = typeof(string).GetRuntimeMethod(nameof(string.StartsWith), new[] { typeof(string) }); | ||
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| private static readonly MethodInfo _endsWithMethodInfo | ||
| = typeof(string).GetRuntimeMethod(nameof(string.EndsWith), new[] { typeof(string) }); | ||
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| private readonly ISqlExpressionFactory _sqlExpressionFactory; | ||
|
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| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public StringMethodTranslator([NotNull] ISqlExpressionFactory sqlExpressionFactory) | ||
| { | ||
| _sqlExpressionFactory = sqlExpressionFactory; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList<SqlExpression> arguments) | ||
| { | ||
| Check.NotNull(method, nameof(method)); | ||
| Check.NotNull(arguments, nameof(arguments)); | ||
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| if (_containsMethodInfo.Equals(method)) | ||
| { | ||
| return TranslateSystemFunction("CONTAINS", instance, arguments[0], typeof(bool)); | ||
| } | ||
|
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| if (_startsWithMethodInfo.Equals(method)) | ||
| { | ||
| return TranslateSystemFunction("STARTSWITH", instance, arguments[0], typeof(bool)); | ||
| } | ||
|
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| if (_endsWithMethodInfo.Equals(method)) | ||
| { | ||
| return TranslateSystemFunction("ENDSWITH", instance, arguments[0], typeof(bool)); | ||
| } | ||
|
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| return null; | ||
| } | ||
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| private SqlExpression TranslateSystemFunction(string function, SqlExpression instance, SqlExpression pattern, Type returnType) | ||
| { | ||
| Check.NotNull(instance, nameof(instance)); | ||
| return _sqlExpressionFactory.ApplyDefaultTypeMapping( | ||
| _sqlExpressionFactory.Function( | ||
| function, | ||
| new[] { instance, pattern }, | ||
| returnType)); | ||
| } | ||
| } | ||
| } |
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