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//---------------------------------------------------------------------
// <copyright file="CaseExpr.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
namespace System.Data.Common.EntitySql.AST
{
using System;
using System.Globalization;
using System.Collections;
using System.Collections.Generic;
/// <summary>
/// Represents the Seached Case Expression - CASE WHEN THEN [ELSE] END.
/// </summary>
internal sealed class CaseExpr : Node
{
private readonly NodeList<WhenThenExpr> _whenThenExpr;
private readonly Node _elseExpr;
/// <summary>
/// Initializes case expression without else sub-expression.
/// </summary>
/// <param name="whenThenExpr">whenThen expression list</param>
internal CaseExpr(NodeList<WhenThenExpr> whenThenExpr)
: this(whenThenExpr, null)
{
}
/// <summary>
/// Initializes case expression with else sub-expression.
/// </summary>
/// <param name="whenThenExpr">whenThen expression list</param>
/// <param name="elseExpr">else expression</param>
internal CaseExpr(NodeList<WhenThenExpr> whenThenExpr, Node elseExpr)
{
_whenThenExpr = whenThenExpr;
_elseExpr = elseExpr;
}
/// <summary>
/// Returns the list of WhenThen expressions.
/// </summary>
internal NodeList<WhenThenExpr> WhenThenExprList
{
get { return _whenThenExpr; }
}
/// <summary>
/// Returns the optional Else expression.
/// </summary>
internal Node ElseExpr
{
get { return _elseExpr; }
}
}
/// <summary>
/// Represents the when then sub expression.
/// </summary>
internal class WhenThenExpr : Node
{
private readonly Node _whenExpr;
private readonly Node _thenExpr;
/// <summary>
/// Initializes WhenThen sub-expression.
/// </summary>
/// <param name="whenExpr">When expression</param>
/// <param name="thenExpr">Then expression</param>
internal WhenThenExpr(Node whenExpr, Node thenExpr)
{
_whenExpr = whenExpr;
_thenExpr = thenExpr;
}
/// <summary>
/// Returns When expression.
/// </summary>
internal Node WhenExpr
{
get { return _whenExpr; }
}
/// <summary>
/// Returns Then Expression.
/// </summary>
internal Node ThenExpr
{
get { return _thenExpr; }
}
}
}
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