/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.accumulo.core.client.lexicoder;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.UUID;
import org.apache.accumulo.core.client.lexicoder.impl.FixedByteArrayOutputStream;
import org.apache.accumulo.core.iterators.ValueFormatException;
/**
* A lexicoder for a UUID that maintains its lexicographic sorting order.
*
* @since 1.6.0
*/
public class UUIDLexicoder implements Lexicoder<UUID> {
/**
* @see <a href="http://www.ietf.org/rfc/rfc4122.txt"> RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace, "Rules for Lexical Equivalence" in
* Section 3.</a>
*/
@Override
public byte[] encode(UUID uuid) {
try {
byte ret[] = new byte[16];
DataOutputStream out = new DataOutputStream(new FixedByteArrayOutputStream(ret));
out.writeLong(uuid.getMostSignificantBits() ^ 0x8000000000000000l);
out.writeLong(uuid.getLeastSignificantBits() ^ 0x8000000000000000l);
out.close();
return ret;
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public UUID decode(byte[] b) throws ValueFormatException {
try {
DataInputStream in = new DataInputStream(new ByteArrayInputStream(b));
return new UUID(in.readLong() ^ 0x8000000000000000l, in.readLong() ^ 0x8000000000000000l);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}