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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Dynamic.Utils;
#if CLR2
namespace Microsoft.Scripting.Ast {
#else
namespace System.Linq.Expressions {
#endif
/// <summary>
/// Represents one case of a <see cref="SwitchExpression"/>.
/// </summary>
#if !SILVERLIGHT
[DebuggerTypeProxy(typeof(Expression.SwitchCaseProxy))]
#endif
public sealed class SwitchCase {
private readonly ReadOnlyCollection<Expression> _testValues;
private readonly Expression _body;
internal SwitchCase(Expression body, ReadOnlyCollection<Expression> testValues) {
_body = body;
_testValues = testValues;
}
/// <summary>
/// Gets the values of this case. This case is selected for execution when the <see cref="SwitchExpression.SwitchValue"/> matches any of these values.
/// </summary>
public ReadOnlyCollection<Expression> TestValues {
get { return _testValues; }
}
/// <summary>
/// Gets the body of this case.
/// </summary>
public Expression Body {
get { return _body; }
}
/// <summary>
/// Returns a <see cref="String"/> that represents the current <see cref="Object"/>.
/// </summary>
/// <returns>A <see cref="String"/> that represents the current <see cref="Object"/>. </returns>
public override string ToString() {
return ExpressionStringBuilder.SwitchCaseToString(this);
}
/// <summary>
/// Creates a new expression that is like this one, but using the
/// supplied children. If all of the children are the same, it will
/// return this expression.
/// </summary>
/// <param name="testValues">The <see cref="TestValues" /> property of the result.</param>
/// <param name="body">The <see cref="Body" /> property of the result.</param>
/// <returns>This expression if no children changed, or an expression with the updated children.</returns>
public SwitchCase Update(IEnumerable<Expression> testValues, Expression body) {
if (testValues == TestValues && body == Body) {
return this;
}
return Expression.SwitchCase(body, testValues);
}
}
public partial class Expression {
/// <summary>
/// Creates a <see cref="T:SwitchCase">SwitchCase</see> for use in a <see cref="SwitchExpression"/>.
/// </summary>
/// <param name="body">The body of the case.</param>
/// <param name="testValues">The test values of the case.</param>
/// <returns>The created <see cref="T:SwitchCase">SwitchCase</see>.</returns>
public static SwitchCase SwitchCase(Expression body, params Expression[] testValues) {
return SwitchCase(body, (IEnumerable<Expression>)testValues);
}
/// <summary>
/// Creates a <see cref="T:SwitchCase">SwitchCase</see> for use in a <see cref="SwitchExpression"/>.
/// </summary>
/// <param name="body">The body of the case.</param>
/// <param name="testValues">The test values of the case.</param>
/// <returns>The created <see cref="T:SwitchCase">SwitchCase</see>.</returns>
public static SwitchCase SwitchCase(Expression body, IEnumerable<Expression> testValues) {
RequiresCanRead(body, "body");
var values = testValues.ToReadOnly();
RequiresCanRead(values, "testValues");
ContractUtils.RequiresNotEmpty(values, "testValues");
return new SwitchCase(body, values);
}
}
}
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