AggregationFunction.java

/***********************************************************************************************************************
 *
 * 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.aggregation;


/**
 * @param <R> The type of the running aggregate.
 * @param <T> The type to be aggregated.
 */
public abstract class AggregationFunction<T> implements java.io.Serializable {
	private static final long serialVersionUID = 1L;

	public abstract void initializeAggregate();
	
	public abstract void aggregate(T value);
	
	public abstract T getAggregate();
}