001/**
002 *
003 * Copyright 2003-2007 Jive Software, 2015 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.packet.id;
018
019import java.util.concurrent.atomic.AtomicLong;
020
021import org.jivesoftware.smack.util.StringUtils;
022
023public class StanzaIdUtil {
024
025    /**
026     * A prefix helps to make sure that ID's are unique across multiple instances.
027     */
028    private static final String PREFIX = StringUtils.randomString(5) + "-";
029
030    /**
031     * Keeps track of the current increment, which is appended to the prefix to
032     * forum a unique ID.
033     */
034    private static final AtomicLong ID = new AtomicLong();
035
036    public static String newStanzaId() {
037        return PREFIX + Long.toString(ID.incrementAndGet());
038    }
039}