package org.apache.pig.backend.hadoop.executionengine.mapReduceLayer;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.WritableComparator;
import org.apache.hadoop.mapred.JobConf;
import org.apache.pig.backend.hadoop.BigDecimalWritable;
import org.apache.pig.impl.io.NullableBigDecimalWritable;
import org.apache.pig.impl.util.ObjectSerializer;
public class PigBigDecimalRawComparator extends WritableComparator implements Configurable {
private static final Log mLog = LogFactory.getLog(PigBigDecimalRawComparator.class);
private boolean[] mAsc;
private final BigDecimalWritable.Comparator mWrappedComp;
public PigBigDecimalRawComparator() {
super(NullableBigDecimalWritable.class);
mWrappedComp = new BigDecimalWritable.Comparator();
}
@Override
public Configuration getConf() {
return null;
}
@Override
public void setConf(Configuration conf) {
if (!(conf instanceof JobConf)) {
mLog.warn("Expected jobconf in setConf, got "
+ conf.getClass().getName());
return;
}
JobConf jconf = (JobConf)conf;
try {
mAsc = (boolean[])ObjectSerializer.deserialize(jconf.get(
"pig.sortOrder"));
} catch (IOException ioe) {
mLog.error("Unable to deserialize pig.sortOrder "
+ ioe.getMessage());
throw new RuntimeException(ioe);
}
if (mAsc == null) {
mAsc = new boolean[1];
mAsc[0] = true;
}
}
/**
* Compare two NullableBigDecimalWritables as raw bytes. If neither are null,
* then BigDecimalWritable.compare() is used. If both are null then the indices
* are compared. Otherwise the null one is defined to be less.
*/
@Override
public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
int rc = 0;
// If either are null, handle differently.
if (b1[s1] == 0 && b2[s2] == 0) {
rc = mWrappedComp.compare(b1, s1 + 1, l1 - 2, b2, s2 + 1, l2 - 2);
} else {
// For sorting purposes two nulls are equal.
if (b1[s1] != 0 && b2[s2] != 0) rc = 0;
else if (b1[s1] != 0) rc = -1;
else rc = 1;
}
if (!mAsc[0]) rc *= -1;
return rc;
}
@Override
public int compare(Object o1, Object o2) {
NullableBigDecimalWritable ndw1 = (NullableBigDecimalWritable)o1;
NullableBigDecimalWritable ndw2 = (NullableBigDecimalWritable)o2;
int rc = 0;
// If either are null, handle differently.
if (!ndw1.isNull() && !ndw2.isNull()) {
rc = ((Double)ndw1.getValueAsPigType()).compareTo((Double)ndw2.getValueAsPigType());
} else {
// For sorting purposes two nulls are equal.
if (ndw1.isNull() && ndw2.isNull()) rc = 0;
else if (ndw1.isNull()) rc = -1;
else rc = 1;
}
if (!mAsc[0]) rc *= -1;
return rc;
}
}