128 lines
3.5 KiB
C#
128 lines
3.5 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="Emitter.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner Microsoft
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// @backupOwner Microsoft
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//---------------------------------------------------------------------
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using System;
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using System.CodeDom;
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using System.Diagnostics;
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using System.Data.EntityModel.SchemaObjectModel;
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namespace System.Data.EntityModel.Emitters
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{
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/// <summary>
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///
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/// </summary>
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internal abstract class Emitter
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{
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#region Instance Fields
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private ClientApiGenerator _generator = null;
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#endregion
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#region Static Fields
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private static CodeExpression _nullExpression = null;
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private static CodeExpression _thisRef = null;
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/// <summary>Name of property used to get StorageContext from an Entity</summary>
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private const string EntityGetContextPropertyName = "Context";
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/// <summary>Name of property used to get StorageContext from a StorageSearcher</summary>
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protected const string SearcherGetContextPropertyName = "Context";
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#endregion
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#region Protected Methods
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/// <summary>
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///
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/// </summary>
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/// <param name="generator"></param>
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protected Emitter(ClientApiGenerator generator)
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{
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Generator = generator;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="expression"></param>
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/// <returns></returns>
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protected static CodeBinaryOperatorExpression EmitExpressionEqualsNull(CodeExpression expression)
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{
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return new CodeBinaryOperatorExpression(expression, CodeBinaryOperatorType.IdentityEquality, NullExpression);
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}
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protected static CodeBinaryOperatorExpression EmitExpressionDoesNotEqualNull(CodeExpression expression)
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{
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return new CodeBinaryOperatorExpression(expression, CodeBinaryOperatorType.IdentityInequality, NullExpression);
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}
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internal static CodeExpression EmitEnumMemberExpression(CodeTypeReference type, string member)
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{
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CodeTypeReferenceExpression typeref = new CodeTypeReferenceExpression(type);
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return new CodeFieldReferenceExpression(typeref, member);
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}
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#endregion
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#region Protected Properties
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/// <summary>
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///
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/// </summary>
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protected static CodeExpression ThisRef
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{
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get
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{
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if (_thisRef == null)
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_thisRef = new CodeThisReferenceExpression();
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return _thisRef;
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}
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}
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/// <summary>
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///
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/// </summary>
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internal ClientApiGenerator Generator
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{
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get
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{
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return _generator;
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}
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private set
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{
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_generator = value;
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}
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}
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protected TypeReference TypeReference
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{
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get
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{
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return _generator.TypeReference;
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}
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}
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protected AttributeEmitter AttributeEmitter
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{
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get { return _generator.AttributeEmitter; }
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}
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protected static CodeExpression NullExpression
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{
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get
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{
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if (_nullExpression == null)
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_nullExpression = new CodePrimitiveExpression(null);
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return _nullExpression;
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}
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}
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#endregion
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}
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}
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