// 
// PropertyDeclaration.cs
//
// Author:
//       Mike Krüger <mkrueger@novell.com>
// 
// Copyright (c) 2010 Novell, Inc (http://www.novell.com)
// 
// 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 ICSharpCode.NRefactory.TypeSystem;

namespace ICSharpCode.NRefactory.CSharp
{
	/// <summary>
	/// get/set/add/remove
	/// </summary>
	public class Accessor : EntityDeclaration
	{
		public static readonly new Accessor Null = new NullAccessor ();
		sealed class NullAccessor : Accessor
		{
			public override bool IsNull {
				get {
					return true;
				}
			}
			
			public override void AcceptVisitor (IAstVisitor visitor)
			{
			}
			
			public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
			{
				return default (T);
			}
			
			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
			{
				return default (S);
			}
			
			protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
			{
				return other == null || other.IsNull;
			}
		}
		
		public override NodeType NodeType {
			get { return NodeType.Unknown; }
		}
		
		public override SymbolKind SymbolKind {
			get { return SymbolKind.Method; }
		}
		
		/// <summary>
		/// Gets the 'get'/'set'/'add'/'remove' keyword
		/// </summary>
		public CSharpTokenNode Keyword {
			get {
				for (AstNode child = this.FirstChild; child != null; child = child.NextSibling) {
					if (child.Role == PropertyDeclaration.GetKeywordRole || child.Role == PropertyDeclaration.SetKeywordRole
					    || child.Role == CustomEventDeclaration.AddKeywordRole || child.Role == CustomEventDeclaration.RemoveKeywordRole)
					{
						return (CSharpTokenNode)child;
					}
				}
				return CSharpTokenNode.Null;
			}
		}
		
		public BlockStatement Body {
			get { return GetChildByRole (Roles.Body); }
			set { SetChildByRole (Roles.Body, value); }
		}
		
		public override void AcceptVisitor (IAstVisitor visitor)
		{
			visitor.VisitAccessor (this);
		}
		
		public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
		{
			return visitor.VisitAccessor (this);
		}
		
		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitAccessor (this, data);
		}
		
		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
		{
			Accessor o = other as Accessor;
			return o != null && !o.IsNull && this.MatchAttributesAndModifiers(o, match) && this.Body.DoMatch(o.Body, match);
		}
	}
}
