/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2010  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see http://www.gnu.org/licenses/. */
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq.Expressions;

namespace Db4objects.Db4o.Linq.Expressions
{
	internal class ExpressionEnumeration : ExpressionVisitor, IEnumerable<Expression>
	{
		private List<Expression> _expressions = new List<Expression>();

		public ExpressionEnumeration(Expression expression)
		{
			Visit(expression);
		}

		protected override void Visit(Expression expression)
		{
			if (expression == null) return;

			_expressions.Add(expression);
			base.Visit(expression);
		}

		public IEnumerator<Expression> GetEnumerator()
		{
			return _expressions.GetEnumerator();
		}

		IEnumerator IEnumerable.GetEnumerator()
		{
			return GetEnumerator();
		}
	}
}
