/** * 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.io;import java.io.*;/** A WritableComparable for ints. */public class IntWritable implements WritableComparable {  private int value;  public IntWritable() {}  public IntWritable(int value) { set(value); }  /** Set the value of this IntWritable. */  public void set(int value) { this.value = value; }  /** Return the value of this IntWritable. */  public int get() { return value; }  public void readFields(DataInput in) throws IOException {    value = in.readInt();  }  public void write(DataOutput out) throws IOException {    out.writeInt(value);  }  /** Returns true iff <code>o</code> is a IntWritable with the same value. */  public boolean equals(Object o) {    if (!(o instanceof IntWritable))      return false;    IntWritable other = (IntWritable)o;    return this.value == other.value;  }  public int hashCode() {    return (int)value;  }  /** Compares two IntWritables. */  public int compareTo(Object o) {    int thisValue = this.value;    int thatValue = ((IntWritable)o).value;    return thisValue - thatValue;  }  public String toString() {    return Integer.toString(value);  }  /** A Comparator optimized for IntWritable. */   public static class Comparator extends WritableComparator {    public Comparator() {      super(IntWritable.class);    }    public int compare(byte[] b1, int s1, int l1,                       byte[] b2, int s2, int l2) {      int thisValue = readInt(b1, s1);      int thatValue = readInt(b2, s2);      return thisValue - thatValue;    }  }  static {                                        // register this comparator    WritableComparator.define(IntWritable.class, new Comparator());  }}