eu.stratosphere.api.java.functions.GroupReduceIterator Maven / Gradle / Ivy

Go to download
/***********************************************************************************************************************
 *
 * 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.api.java.functions;

import java.util.Iterator;

import eu.stratosphere.util.Collector;


public abstract class GroupReduceIterator extends GroupReduceFunction {
	
	private static final long serialVersionUID = 1L;


	public abstract Iterator reduceGroup(Iterator values) throws Exception;
	
	
	// -------------------------------------------------------------------------------------------
	
	@Override
	public final void reduce(Iterator values, Collector out) throws Exception {
		for (Iterator iter = reduceGroup(values); iter.hasNext(); ) {
			out.collect(iter.next());
		}
	}
}