CompositeCloser.java

/**
 * 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.camel.guice.support;

import java.util.Collection;

import com.google.common.collect.Iterables;

/**
 * A Composite implementation of {@link Closer}
 * 
 * @version
 */
public class CompositeCloser implements Closer {
    private final Iterable<Closer> closers;
    
    public CompositeCloser(Iterable<Closer> closers) {
        this.closers = closers;
    }

    public void close(Object object) throws Throwable {
        for (Closer closer : closers) {
            closer.close(object);
        }
    }
    
    /**
     * Returns a {@link Closer} for the given lists of closer strategies or
     * returning null if the collection is empty
     */
    public static Closer newInstance(Collection<Closer> closers) {
        if (closers.isEmpty()) {
            return null;
        }
        if (closers.size() == 1) {
            return Iterables.getOnlyElement(closers);
        }
        return new CompositeCloser(closers);
    }

}