/** * Copyright 2005 The Apache Software Foundation * * 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 org.apache.hadoop.mapred;import java.io.IOException;import org.apache.hadoop.io.Writable;import org.apache.hadoop.io.WritableComparable;/** Passed to {@link Mapper} and {@link Reducer} implementations to collect * output data. */public interface OutputCollector {  /** Adds a key/value pair to the output.   *   * @param key the key to add   * @param value to value to add   */  void collect(WritableComparable key, Writable value) throws IOException;}