Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.mrql; import java.io.IOException; import java.io.DataInput; import java.io.DataOutput; import org.apache.hadoop.io.*; import org.apache.hadoop.fs.*; /** a container for short values */ final public class MR_short extends MRData { private short value; public MR_short() { } public MR_short(short i) { value = i; } public void materializeAll() { }; public short get() { return value; } public void set(short v) { value = v; } final public void write(DataOutput out) throws IOException { out.writeByte(MRContainer.SHORT); out.writeShort(value); } final public static MR_short read(DataInput in) throws IOException { return new MR_short(in.readShort()); } public void readFields(DataInput in) throws IOException { value = in.readShort(); } public int compareTo(MRData x) { assert (x instanceof MR_short); return value - ((MR_short) x).value; } final public static int compare(byte[] x, int xs, int xl, byte[] y, int ys, int yl, int[] size) { size[0] = (Short.SIZE >> 3) + 1; return WritableComparator.readUnsignedShort(x, xs) - WritableComparator.readUnsignedShort(y, ys); } public boolean equals(Object x) { return x instanceof MR_short && ((MR_short) x).value == value; } public int hashCode() { return Math.abs((int) value); } public String toString() { return Short.toString(value); } }