/** * 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 booleans.  */public class BooleanWritable implements WritableComparable {    private boolean value;    /**      */    public BooleanWritable() {};    /**      */    public BooleanWritable(boolean value) {        set(value);    }    /**      * Set the value of the BooleanWritable     */        public void set(boolean value) {        this.value = value;    }    /**     * Returns the value of the BooleanWritable     */    public boolean get() {        return value;    }    /**     */    public void readFields(DataInput in) throws IOException {        value = in.readBoolean();    }    /**     */    public void write(DataOutput out) throws IOException {        out.writeBoolean(value);    }    /**     */    public boolean equals(Object o) {        if (!(o instanceof BooleanWritable)) {            return false;        }        BooleanWritable other = (BooleanWritable) o;        return this.value == other.value;    }    public int hashCode() {      return value ? 0 : 1;    }    /**     */    public int compareTo(Object o) {        boolean a = this.value;        boolean b = ((BooleanWritable) o).value;        return ((a == b) ? 0 : (a == false) ? -1 : 1);    }    /**      * A Comparator optimized for BooleanWritable.      */     public static class Comparator extends WritableComparator {        public Comparator() {            super(BooleanWritable.class);        }        public int compare(byte[] b1, int s1, int l1,                           byte[] b2, int s2, int l2) {            boolean a = (readInt(b1, s1) == 1) ? true : false;            boolean b = (readInt(b2, s2) == 1) ? true : false;            return ((a == b) ? 0 : (a == false) ? -1 : 1);        }    }    static {      WritableComparator.define(BooleanWritable.class, new Comparator());    }}