/*
* Cloud9: A MapReduce Library for Hadoop
*
* 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 edu.umd.cloud9.io.triple;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableComparator;
/**
* <p>
* WritableComparable representing a pair of integers. The elements in the pair
* are referred to as the left and right elements. The natural sort order is:
* first by the left element, and then by the right element.
* </p>
*
* @author Jimmy Lin
*/
public class TripleOfIntsString implements WritableComparable<TripleOfIntsString> {
private int leftElement, middleElement;
private String rightElement;
/**
* Creates a ThreeInts instance.
*/
public TripleOfIntsString() {
}
/**
* Creates a pair.
*
* @param left
* the left element
* @param middle
* the middle element
* @param right
* the right element
*/
public TripleOfIntsString(int left, int middle, String right) {
set(left, middle, right);
}
/**
* Deserializes this ThreeInts instance.
*
* @param in
* source for raw byte representation
*/
public void readFields(DataInput in) throws IOException {
leftElement = in.readInt();
middleElement = in.readInt();
rightElement = in.readUTF();
}
/**
* Serializes this ThreeInts instance.
*
* @param out
* where to write the raw byte representation
*/
public void write(DataOutput out) throws IOException {
out.writeInt(leftElement);
out.writeInt(middleElement);
out.writeUTF(rightElement);
}
/**
* Returns the left element.
*
* @return the left element
*/
public int getLeftElement() {
return leftElement;
}
/**
* Returns the middle element.
*
* @return the middle element
*/
public int getMiddleElement() {
return middleElement;
}
/**
* Returns the right element.
*
* @return the right element
*/
public String getRightElement() {
return rightElement;
}
/**
* Sets the right and left elements of this pair.
*
* @param left
* the left element
* @param middle
* the middle element
* @param right
* the right element
*/
public void set(int left, int middle, String right) {
leftElement = left;
middleElement = middle;
rightElement = right;
}
/**
* Checks two ThreeInts for equality.
*
* @param obj
* object for comparison
* @return <code>true</code> if <code>obj</code> is equal to this object,
* <code>false</code> otherwise
*/
public boolean equals(Object obj) {
TripleOfIntsString threeInts = (TripleOfIntsString) obj;
return leftElement == threeInts.getLeftElement()
&& middleElement == threeInts.getMiddleElement()
&& rightElement.equals(threeInts.getRightElement());
}
/**
* Defines a natural sort order for pairs. Pairs are sorted first by the
* left element, and then by the right element.
*
* @return a value less than zero, a value greater than zero, or zero if
* this pair should be sorted before, sorted after, or is equal to
* <code>obj</code>.
*/
public int compareTo(TripleOfIntsString obj) {
TripleOfIntsString threeInts = (TripleOfIntsString) obj;
int pl = threeInts.getLeftElement();
int pm = threeInts.getMiddleElement();
String pr = threeInts.getRightElement();
if (leftElement < pl) {
return -1;
} else if (leftElement > pl) {
return 1;
} else {
if (middleElement < pm) {
return -1;
} else if (middleElement > pm) {
return 1;
} else {
return rightElement.compareTo(pr);
}
}
}
/**
* Returns a hash code value for this ThreeInts instance.
*
* @return hash code for this ThreeInts instance
*/
public int hashCode() {
return leftElement + middleElement + rightElement.hashCode();
}
/**
* Generates human-readable String representation of this pair.
*
* @return human-readable String representation of this pair
*/
public String toString() {
return "(" + leftElement + ", " + middleElement + ", " + rightElement + ")";
}
/**
* Clones this object.
*
* @return clone of this object
*/
public TripleOfIntsString clone() {
return new TripleOfIntsString(this.leftElement, this.middleElement, this.rightElement);
}
/** Comparator optimized for <code>PairOfInts</code>. */
public static class Comparator extends WritableComparator {
/**
* Creates a new Comparator optimized for <code>PairOfInts</code>.
*/
public Comparator() {
super(TripleOfIntsString.class);
}
/**
* Optimization hook.
*/
public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
int thisLeftValue = readInt(b1, s1);
int thatLeftValue = readInt(b2, s2);
if (thisLeftValue < thatLeftValue) {
return -1;
} else if (thisLeftValue > thatLeftValue) {
return 1;
} else {
int thisMiddleValue = readInt(b1, s1 + 4);
int thatMiddleValue = readInt(b2, s2 + 4);
if (thisMiddleValue < thatMiddleValue) {
return -1;
} else if (thisMiddleValue > thatMiddleValue) {
return 1;
} else {
int thisRightValue = readInt(b1, s1 + 8);
int thatRightValue = readInt(b2, s2 + 8);
if (thisRightValue < thatRightValue) {
return -1;
} else if (thisRightValue > thatRightValue) {
return 1;
} else {
return 0;
}
}
}
}
}
static { // register this comparator
WritableComparator.define(TripleOfIntsString.class, new Comparator());
}
}