source: branches/2893_BNLR/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Resolver/AwaitResolveResult.cs

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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 };
    }
  }
}