org.jcf.graphicMessage.IdFactory.java Source code

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Here is the source code for org.jcf.graphicMessage.IdFactory.java

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/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * Licensed 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.jcf.graphicMessage;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.springframework.util.Assert;

/**
 * Id factory creating Ids
 * @author FaKod
 *
 */
abstract class IdFactory {

    /**
     * id per room map
     */
    private static Map<String, Id> ids = Collections.synchronizedMap(new HashMap<String, Id>());

    /**
     * get new id (as a new Object) for an existing or new room
     * @param room string as a room id
     * @return new and incremented id
     */
    static Id getNextId(String room, String nikName) {
        Assert.hasLength(room);
        Assert.hasLength(nikName);

        Id id;
        synchronized (ids) {
            id = ids.get(room);
            if (id == null) {
                id = new Id(nikName);
                ids.put(room, id);
            }
        }
        return new Id(id.inc());
    }
}