/** * 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 java.io.DataInput;import org.apache.hadoop.io.Writable;/** Reads key/value pairs from an input file {@link FileSplit}. * Implemented by {@link InputFormat} implementations. */public interface RecordReader {  /** Reads the next key/value pair.   *   * @param key the key to read data into   * @param value the value to read data into   * @return true iff a key/value was read, false if at EOF   *   * @see Writable#readFields(DataInput)   */        boolean next(Writable key, Writable value) throws IOException;  /** Returns the current position in the input. */  long getPos() throws IOException;  /** Close this to future operations.*/   public void close() throws IOException;}