diff options
Diffstat (limited to 'qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java')
-rw-r--r-- | qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java b/qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java new file mode 100644 index 0000000000..e764c8536b --- /dev/null +++ b/qpid/java/common/src/main/java/org/apache/qpid/util/NameUUIDGen.java @@ -0,0 +1,59 @@ +/* + * + * 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.qpid.util; + +import java.nio.ByteBuffer; +import java.util.UUID; + + +/** + * NameUUIDGen + * + */ + +public final class NameUUIDGen implements UUIDGen +{ + + private static final int WIDTH = 8; + + final private byte[] seed; + final private ByteBuffer seedBuf; + private long counter; + + public NameUUIDGen() + { + String namespace = UUID.randomUUID().toString(); + this.seed = new byte[namespace.length() + WIDTH]; + for (int i = WIDTH; i < seed.length; i++) + { + seed[i] = (byte) namespace.charAt(i - WIDTH); + } + this.seedBuf = ByteBuffer.wrap(seed); + this.counter = 0; + } + + public UUID generate() + { + seedBuf.putLong(0, counter++); + return UUID.nameUUIDFromBytes(seed); + } + +} |