source: trunk/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Resolver/AwaitResolveResult.cs @ 17578

// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;

namespace ICSharpCode.NRefactory.CSharp.Resolver
{
  /// <summary>
  /// Represents the result of an await expression.
  /// </summary>
  public class AwaitResolveResult : ResolveResult
  {
    /// <summary>
    /// The method representing the GetAwaiter() call. Can be an <see cref="InvocationResolveResult"/> or a <see cref="DynamicInvocationResolveResult"/>.
    /// </summary>
    public readonly ResolveResult GetAwaiterInvocation;

    /// <summary>
    /// Awaiter type. Will not be null (but can be UnknownType).
    /// </summary>
    public readonly IType AwaiterType;

    /// <summary>
    /// Property representing the IsCompleted property on the awaiter type. Can be null if the awaiter type or the property was not found, or when awaiting a dynamic expression.
    /// </summary>
    public readonly IProperty IsCompletedProperty;

    /// <summary>
    /// Method representing the OnCompleted method on the awaiter type. Can be null if the awaiter type or the method was not found, or when awaiting a dynamic expression.
    /// This can also refer to an UnsafeOnCompleted method, if the awaiter type implements <c>System.Runtime.CompilerServices.ICriticalNotifyCompletion</c>.
    /// </summary>
    public readonly IMethod OnCompletedMethod;
    
    /// <summary>
    /// Method representing the GetResult method on the awaiter type. Can be null if the awaiter type or the method was not found, or when awaiting a dynamic expression.
    /// </summary>
    public readonly IMethod GetResultMethod;

    public AwaitResolveResult(IType resultType, ResolveResult getAwaiterInvocation, IType awaiterType, IProperty isCompletedProperty, IMethod onCompletedMethod, IMethod getResultMethod)
      : base(resultType)
    {
      if (awaiterType == null)
        throw new ArgumentNullException("awaiterType");
      if (getAwaiterInvocation == null)
        throw new ArgumentNullException("getAwaiterInvocation");
      this.GetAwaiterInvocation = getAwaiterInvocation;
      this.AwaiterType = awaiterType;
      this.IsCompletedProperty = isCompletedProperty;
      this.OnCompletedMethod = onCompletedMethod;
      this.GetResultMethod = getResultMethod;
    }
    
    public override bool IsError {
      get { return this.GetAwaiterInvocation.IsError || (AwaiterType.Kind != TypeKind.Dynamic && (this.IsCompletedProperty == null || this.OnCompletedMethod == null || this.GetResultMethod == null)); }
    }

    public override IEnumerable<ResolveResult> GetChildResults() {
      return new[] { GetAwaiterInvocation };
    }
  }
}