/*
* 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.uima.internal.util;
import java.rmi.dgc.VMID;
import java.rmi.server.UID;
/**
* Utility class for generating UUIDs. This implementation currently uses RMI's VMID and UID
* objects.
*
*
*/
public abstract class UUIDGenerator {
/**
* Generates a UUID.
*
* @return the UUID
*/
public static String generate() {
String uuid = mHostId + new UID().toString();
// System.out.println("UUID: " + uuid);
return uuid;
}
private static String mHostId;
// static initializer
static {
String vmid = new VMID().toString();
// System.out.println("VMID = " + vmid);
// host ID appears to be first part of VMID - the rest of the VMID is
// repeated in each UID
int colonOffset = vmid.indexOf(':');
if (colonOffset > 0) {
mHostId = vmid.substring(0, colonOffset + 1);
} else {
mHostId = vmid;
}
}
}