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