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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.Dynamic.Utils;
namespace System.Dynamic {
/// <summary>
/// Represents the convert dynamic operation at the call site, providing the binding semantic and the details about the operation.
/// </summary>
public abstract class ConvertBinder : DynamicMetaObjectBinder {
private readonly Type _type;
private readonly bool _explicit;
/// <summary>
/// Initializes a new intsance of the <see cref="ConvertBinder" />.
/// </summary>
/// <param name="type">The type to convert to.</param>
/// <param name="explicit">true if the conversion should consider explicit conversions; otherwise, false.</param>
protected ConvertBinder(Type type, bool @explicit) {
ContractUtils.RequiresNotNull(type, "type");
_type = type;
_explicit = @explicit;
}
/// <summary>
/// The type to convert to.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1721:PropertyNamesShouldNotMatchGetMethods")]
public Type Type {
get {
return _type;
}
}
/// <summary>
/// Gets the value indicating if the conversion should consider explicit conversions.
/// </summary>
public bool Explicit {
get {
return _explicit;
}
}
/// <summary>
/// Performs the binding of the dynamic convert operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic convert operation.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public DynamicMetaObject FallbackConvert(DynamicMetaObject target) {
return FallbackConvert(target, null);
}
/// <summary>
/// When overridden in the derived class, performs the binding of the dynamic convert operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic convert operation.</param>
/// <param name="errorSuggestion">The binding result to use if binding fails, or null.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public abstract DynamicMetaObject FallbackConvert(DynamicMetaObject target, DynamicMetaObject errorSuggestion);
/// <summary>
/// Performs the binding of the dynamic convert operation.
/// </summary>
/// <param name="target">The target of the dynamic convert operation.</param>
/// <param name="args">An array of arguments of the dynamic convert operation.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public sealed override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args) {
ContractUtils.RequiresNotNull(target, "target");
ContractUtils.Requires(args == null || args.Length == 0, "args");
return target.BindConvert(this);
}
// this is a standard DynamicMetaObjectBinder
internal override sealed bool IsStandardBinder {
get {
return true;
}
}
/// <summary>
/// The result type of the operation.
/// </summary>
public override sealed Type ReturnType {
get { return _type; }
}
}
}
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