source: tags/3.3.13/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/TypeSystem/Implementation/SimpleConstantValue.cs

// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
// 
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// 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
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using System;
using ICSharpCode.NRefactory.Semantics;

namespace ICSharpCode.NRefactory.TypeSystem.Implementation
{
  /// <summary>
  /// A simple constant value that is independent of the resolve context.
  /// </summary>
  [Serializable]
  public sealed class SimpleConstantValue : IConstantValue, ISupportsInterning
  {
    readonly ITypeReference type;
    readonly object value;
    
    public SimpleConstantValue(ITypeReference type, object value)
    {
      if (type == null)
        throw new ArgumentNullException("type");
      this.type = type;
      this.value = value;
    }
    
    public ResolveResult Resolve(ITypeResolveContext context)
    {
      return new ConstantResolveResult(type.Resolve(context), value);
    }
    
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase",
                                                     Justification = "The C# keyword is lower case")]
    public override string ToString()
    {
      if (value == null)
        return "null";
      else if (value is bool)
        return value.ToString().ToLowerInvariant();
      else
        return value.ToString();
    }
    
    int ISupportsInterning.GetHashCodeForInterning()
    {
      return type.GetHashCode() ^ (value != null ? value.GetHashCode() : 0);
    }
    
    bool ISupportsInterning.EqualsForInterning(ISupportsInterning other)
    {
      SimpleConstantValue scv = other as SimpleConstantValue;
      return scv != null && type == scv.type && value == scv.value;
    }
  }
}