// 
// UsingDeclaration.cs
//
// Author:
//       Mike Krüger <mkrueger@novell.com>
// 
// Copyright (c) 2009 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 System.Linq;
using System.Text;

namespace ICSharpCode.NRefactory.CSharp
{
	public class UsingDeclaration : DomNode
	{
		public const int ImportRole = 100;
		
		public override NodeType NodeType {
			get {
				return NodeType.Unknown;
			}
		}
		
		public string Namespace {
			get {
				StringBuilder b = new StringBuilder();
				if (AppendName(b, this.Import))
					return b.ToString();
				else
					return null;
			}
		}
		
		static bool AppendName(StringBuilder b, DomNode import)
		{
			MemberType m = import as MemberType;
			if (m != null && !m.TypeArguments.Any()) {
				AppendName(b, m.Target);
				b.Append('.');
				b.Append(m.Identifier);
				return true;
			}
			SimpleType t = import as SimpleType;
			if (t != null && !t.TypeArguments.Any()) {
				if (t.IsQualifiedWithAlias) {
					b.Append(t.AliasIdentifier.Name);
					b.Append("::");
				}
				b.Append(t.Identifier);
				return true;
			}
			return false;
		}
		
		public DomNode Import {
			get {
				return GetChildByRole (ImportRole) ?? DomNode.Null;
			}
		}
		
		public override S AcceptVisitor<T, S> (DomVisitor<T, S> visitor, T data)
		{
			return visitor.VisitUsingDeclaration (this, data);
		}
	}
}