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lazy compute the hash and actually use it...

This commit is contained in:
Shay Banon 2013-05-10 11:51:42 +02:00
parent 4d66575abe
commit c5e177dc56
1 changed files with 9 additions and 6 deletions
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15
src/main/java/org/elasticsearch/common/bytes/HashedBytesArray.java
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@ -30,21 +30,21 @@ import org.jboss.netty.buffer.ChannelBuffers;
import java.io.IOException; import java.io.IOException;
import java.io.OutputStream; import java.io.OutputStream;
import java.util.Arrays;
/** /**
* * A bytes array reference that caches the hash code.
*/ */
public class HashedBytesArray implements BytesReference { public class HashedBytesArray implements BytesReference {
private final byte[] bytes; private final byte[] bytes;
// we pre-compute the hashCode for better performance (especially in IdCache) /**
private final int hashCode; * Cache the hash code for the string
*/
private int hash; // Defaults to 0
public HashedBytesArray(byte[] bytes) { public HashedBytesArray(byte[] bytes) {
this.bytes = bytes; this.bytes = bytes;
this.hashCode = Arrays.hashCode(bytes);
} }
public HashedBytesArray(String str) { public HashedBytesArray(String str) {
@ -138,7 +138,10 @@ public class HashedBytesArray implements BytesReference {
@Override @Override
public int hashCode() { public int hashCode() {
return Helper.bytesHashCode(this); if (hash == 0) {
hash = Helper.bytesHashCode(this);
}
return hash;
} }
@Override @Override