/* $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.etch.compiler.ast;

/**
 * An implementation of tree walker that does nothing. Useful for
 * instances where you want to look at a few things during a tree
 * walk but don't want to look at everything.
 */
public class AbstractTreeWalker implements TreeWalker
{
	public void doExtern( Extern extern )
	{
		// ignore.
	}

	public void doItem( Item item )
	{
		// ignore.
	}

	public void doMixin( Mixin mixin )
	{
		// ignore.
	}

	public void doThrown( Thrown thrown )
	{
		// ignore.
	}

	public void doTypeRef( TypeRef ref )
	{
		// ignore.
	}

	public void postConstant( Constant constant )
	{
		// ignore.
	}

	public void postEnum( Enumx enumx )
	{
		// ignore.
	}

	public void postExcept( Except except )
	{
		// ignore.
	}

	public void postMessage( Message message )
	{
		// ignore.
	}

	public void postModule( Module module )
	{
		// ignore.
	}

	public void postParameter( Parameter parameter )
	{
		// ignore.
	}

	public void postService( Service service )
	{
		// ignore.
	}

	public void postStruct( Struct struct )
	{
		// ignore.
	}

	public void preConstant( Constant constant )
	{
		// ignore.
	}

	public void preEnum( Enumx enumx )
	{
		// ignore.
	}

	public void preExcept( Except except )
	{
		// ignore.
	}

	public void preMessage( Message message )
	{
		// ignore.
	}

	public void preModule( Module module )
	{
		// ignore.
	}

	public void preParameter( Parameter parameter )
	{
		// ignore.
	}

	public void preService( Service service )
	{
		// ignore.
	}

	public void preStruct( Struct struct )
	{
		// ignore.
	}
}