org.linkedin.zookeeper.client.WatcherChain.java Source code

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Here is the source code for org.linkedin.zookeeper.client.WatcherChain.java

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/*
 * Copyright 2010-2010 LinkedIn, Inc
 *
 * 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.linkedin.zookeeper.client;

import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.WatchedEvent;

import java.util.Collection;
import java.util.Arrays;
import java.util.ArrayList;

/**
 * @author ypujante@linkedin.com
 */
public class WatcherChain implements Watcher {
    private final Collection<Watcher> _watchers;

    /**
     * Constructor
     */
    public WatcherChain(Watcher... watchers) {
        this(Arrays.asList(watchers));
    }

    /**
     * Constructor
     */
    public WatcherChain(Collection<Watcher> watchers) {
        _watchers = watchers;
    }

    @Override
    public void process(WatchedEvent event) {
        for (Watcher watcher : _watchers) {
            watcher.process(event);
        }
    }

    public static Watcher createChain(Watcher... watchers) {
        if (watchers == null || watchers.length == 0)
            return null;

        ArrayList<Watcher> list = new ArrayList<Watcher>();

        for (Watcher watcher : watchers) {
            if (watcher != null)
                list.add(watcher);
        }

        if (list.size() == 1)
            return list.get(0);
        else
            return new WatcherChain(list);
    }
}