eu.stratosphere.util.Visitor Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of stratosphere-core Show documentation

There is a newer version: 0.5.2-hadoop2

/***********************************************************************************************************************
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * Licensed 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 eu.stratosphere.util;

/**
 * A visitor encapsulates functionality that is applied to each node in the process of a traversal of a tree or DAD. 
 */
public interface Visitor> {
	
	/**
	 * 
	 * @param visitable
	 * 
	 * @return True, if the traversal should continue, false otherwise.
	 */
	boolean preVisit(T visitable);

	/**
	 * @param visitable
	 */
	void postVisit(T visitable);
}