package edu.uci.ics.hivesterix.runtime.factory.comparator; | |
import org.apache.hadoop.io.WritableComparator; | |
import edu.uci.ics.hivesterix.serde.lazy.LazyUtils; | |
import edu.uci.ics.hivesterix.serde.lazy.LazyUtils.VInt; | |
import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator; | |
import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory; | |
public class HiveStringBinaryDescComparatorFactory implements IBinaryComparatorFactory { | |
private static final long serialVersionUID = 1L; | |
public static HiveStringBinaryDescComparatorFactory INSTANCE = new HiveStringBinaryDescComparatorFactory(); | |
private HiveStringBinaryDescComparatorFactory() { | |
} | |
@Override | |
public IBinaryComparator createBinaryComparator() { | |
return new IBinaryComparator() { | |
private VInt leftLen = new VInt(); | |
private VInt rightLen = new VInt(); | |
@Override | |
public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { | |
LazyUtils.readVInt(b1, s1, leftLen); | |
LazyUtils.readVInt(b2, s2, rightLen); | |
if (leftLen.value + leftLen.length != l1 || rightLen.value + rightLen.length != l2) | |
throw new IllegalStateException("parse string: length mismatch, expected " | |
+ (leftLen.value + leftLen.length) + ", " + (rightLen.value + rightLen.length) | |
+ " but get " + l1 + ", " + l2); | |
return -WritableComparator.compareBytes(b1, s1 + leftLen.length, l1 - leftLen.length, b2, s2 | |
+ rightLen.length, l2 - rightLen.length); | |
} | |
}; | |
} | |
} |