p1b

textpair.java

package net.sacred;

import java.io.*;
import org.apache.hadoop.io.*;

// Create a pair of Text objects that we can emit from a map function.
// From example 4.7 in Hadoop, The Definitive Guide. O'Reilly 2010

public class TextPair implements WritableComparable<TextPair> {
    private Text first;
    private Text second;

    public TextPair() {
	set(new Text(), new Text());
    }

    public TextPair(String first, String second) {
	set(new Text(first), new Text(second));
    }

    public TextPair(Text first, Text second) {
	set(first, second);
    }

    public void set(Text first, Text second) { 
	this.first = first;
	this.second = second;
    }

    public Text getFirst() {
	return first;
    }
    
    public Text getSecond() {
	return second;
    }

    @Override 
    public void write(DataOutput out) throws IOException {
	first.write(out);
	second.write(out);
    }

    @Override 
    public void readFields(DataInput in) throws IOException {
	first.readFields(in);
	second.readFields(in);
    }

    @Override 
    public int hashCode() {
	return first.hashCode() * 163 + second.hashCode();
    }

    @Override 
    public boolean equals(Object o) {
	if (o instanceof TextPair) {
	    TextPair tp = (TextPair) o;
	    return first.equals(tp.first) && second.equals(tp.second);
	}
	return false;
    }

    @Override
    public String toString() {
	return  first + " " + second;
    }

    @Override 
    public int compareTo(TextPair tp) {
	int cmp = first.compareTo(tp.first); 
	if (cmp != 0) {
	    return cmp; 
	}
	return second.compareTo(tp.second);
    }
}