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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 invoke member dynamic operation at the call site,
/// providing the binding semantic and the details about the operation.
/// </summary>
public abstract class InvokeMemberBinder : DynamicMetaObjectBinder {
private readonly string _name;
private readonly bool _ignoreCase;
private readonly CallInfo _callInfo;
/// <summary>
/// Initializes a new instance of the <see cref="InvokeMemberBinder" />.
/// </summary>
/// <param name="name">The name of the member to invoke.</param>
/// <param name="ignoreCase">true if the name should be matched ignoring case; false otherwise.</param>
/// <param name="callInfo">The signature of the arguments at the call site.</param>
protected InvokeMemberBinder(string name, bool ignoreCase, CallInfo callInfo) {
ContractUtils.RequiresNotNull(name, "name");
ContractUtils.RequiresNotNull(callInfo, "callInfo");
_name = name;
_ignoreCase = ignoreCase;
_callInfo = callInfo;
}
/// <summary>
/// The result type of the operation.
/// </summary>
public override sealed Type ReturnType {
get { return typeof(object); }
}
/// <summary>
/// Gets the name of the member to invoke.
/// </summary>
public string Name {
get {
return _name;
}
}
/// <summary>
/// Gets the value indicating if the string comparison should ignore the case of the member name.
/// </summary>
public bool IgnoreCase {
get {
return _ignoreCase;
}
}
/// <summary>
/// Gets the signature of the arguments at the call site.
/// </summary>
public CallInfo CallInfo {
get { return _callInfo; }
}
/// <summary>
/// Performs the binding of the dynamic invoke member operation.
/// </summary>
/// <param name="target">The target of the dynamic invoke member operation.</param>
/// <param name="args">An array of arguments of the dynamic invoke member 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.RequiresNotNullItems(args, "args");
return target.BindInvokeMember(this, args);
}
// this is a standard DynamicMetaObjectBinder
internal override sealed bool IsStandardBinder {
get {
return true;
}
}
/// <summary>
/// Performs the binding of the dynamic invoke member operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic invoke member operation.</param>
/// <param name="args">The arguments of the dynamic invoke member operation.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public DynamicMetaObject FallbackInvokeMember(DynamicMetaObject target, DynamicMetaObject[] args) {
return FallbackInvokeMember(target, args, null);
}
/// <summary>
/// When overridden in the derived class, performs the binding of the dynamic invoke member operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic invoke member operation.</param>
/// <param name="args">The arguments of the dynamic invoke member 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 FallbackInvokeMember(DynamicMetaObject target, DynamicMetaObject[] args, DynamicMetaObject errorSuggestion);
/// <summary>
/// When overridden in the derived class, performs the binding of the dynamic invoke operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic invoke operation.</param>
/// <param name="args">The arguments of the dynamic invoke 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>
/// <remarks>
/// This method is called by the target when the target implements the invoke member operation
/// as a sequence of get member, and invoke, to let the <see cref="DynamicMetaObject"/>
/// request the binding of the invoke operation only.
/// </remarks>
public abstract DynamicMetaObject FallbackInvoke(DynamicMetaObject target, DynamicMetaObject[] args, DynamicMetaObject errorSuggestion);
}
}
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