source: branches/2839_HiveProjectManagement/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/TypeSystem/IntersectionType.cs @ 17347

// 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
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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 System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Text;

using ICSharpCode.NRefactory.TypeSystem.Implementation;

namespace ICSharpCode.NRefactory.TypeSystem
{
  /// <summary>
  /// Represents the intersection of several types.
  /// </summary>
  public class IntersectionType : AbstractType
  {
    readonly ReadOnlyCollection<IType> types;
    
    public ReadOnlyCollection<IType> Types {
      get { return types; }
    }
    
    private IntersectionType(IType[] types)
    {
      Debug.Assert(types.Length >= 2);
      this.types = Array.AsReadOnly(types);
    }
    
    public static IType Create(IEnumerable<IType> types)
    {
      IType[] arr = types.Distinct().ToArray();
      foreach (IType type in arr) {
        if (type == null)
          throw new ArgumentNullException();
      }
      if (arr.Length == 0)
        return SpecialType.UnknownType;
      else if (arr.Length == 1)
        return arr[0];
      else
        return new IntersectionType(arr);
    }
    
    public override TypeKind Kind {
      get { return TypeKind.Intersection; }
    }
    
    public override string Name {
      get {
        StringBuilder b = new StringBuilder();
        foreach (var t in types) {
          if (b.Length > 0)
            b.Append(" & ");
          b.Append(t.Name);
        }
        return b.ToString();
      }
    }
    
    public override string ReflectionName {
      get {
        StringBuilder b = new StringBuilder();
        foreach (var t in types) {
          if (b.Length > 0)
            b.Append(" & ");
          b.Append(t.ReflectionName);
        }
        return b.ToString();
      }
    }
    
    public override bool? IsReferenceType {
      get {
        foreach (var t in types) {
          bool? isReferenceType = t.IsReferenceType;
          if (isReferenceType.HasValue)
            return isReferenceType.Value;
        }
        return null;
      }
    }
    
    public override int GetHashCode()
    {
      int hashCode = 0;
      unchecked {
        foreach (var t in types) {
          hashCode *= 7137517;
          hashCode += t.GetHashCode();
        }
      }
      return hashCode;
    }
    
    public override bool Equals(IType other)
    {
      IntersectionType o = other as IntersectionType;
      if (o != null && types.Count == o.types.Count) {
        for (int i = 0; i < types.Count; i++) {
          if (!types[i].Equals(o.types[i]))
            return false;
        }
        return true;
      }
      return false;
    }
    
    public override IEnumerable<IType> DirectBaseTypes {
      get { return types; }
    }
    
    public override ITypeReference ToTypeReference()
    {
      throw new NotSupportedException();
    }
    
    public override IEnumerable<IMethod> GetMethods(Predicate<IUnresolvedMethod> filter, GetMemberOptions options)
    {
      return GetMembersHelper.GetMethods(this, FilterNonStatic(filter), options);
    }
    
    public override IEnumerable<IMethod> GetMethods(IList<IType> typeArguments, Predicate<IUnresolvedMethod> filter, GetMemberOptions options)
    {
      return GetMembersHelper.GetMethods(this, typeArguments, filter, options);
    }
    
    public override IEnumerable<IProperty> GetProperties(Predicate<IUnresolvedProperty> filter, GetMemberOptions options)
    {
      return GetMembersHelper.GetProperties(this, FilterNonStatic(filter), options);
    }
    
    public override IEnumerable<IField> GetFields(Predicate<IUnresolvedField> filter, GetMemberOptions options)
    {
      return GetMembersHelper.GetFields(this, FilterNonStatic(filter), options);
    }
    
    public override IEnumerable<IEvent> GetEvents(Predicate<IUnresolvedEvent> filter, GetMemberOptions options)
    {
      return GetMembersHelper.GetEvents(this, FilterNonStatic(filter), options);
    }
    
    public override IEnumerable<IMember> GetMembers(Predicate<IUnresolvedMember> filter, GetMemberOptions options)
    {
      return GetMembersHelper.GetMembers(this, FilterNonStatic(filter), options);
    }
    
    public override IEnumerable<IMethod> GetAccessors(Predicate<IUnresolvedMethod> filter, GetMemberOptions options)
    {
      return GetMembersHelper.GetAccessors(this, FilterNonStatic(filter), options);
    }
    
    static Predicate<T> FilterNonStatic<T>(Predicate<T> filter) where T : class, IUnresolvedMember
    {
      if (filter == null)
        return member => !member.IsStatic;
      else
        return member => !member.IsStatic && filter(member);
    }
  }
}