activeio-core/src/main/java/org/apache/activeio/packet/sync/FilterSyncChannel.java

/**
 *
 * Copyright 2005-2006 The Apache Software Foundation
 *
 * 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.apache.activeio.packet.sync;

import java.io.IOException;

import org.apache.activeio.packet.Packet;


/**
 * A SynchChannelFilter can be used as a filter another {@see org.apache.activeio.SynchChannel}
 * Most {@see org.apache.activeio.SynchChannel} that are not directly accessing the network will 
 * extends the SynchChannelFilter since they act as a filter between the client and the network.
 *    
 * @version $Revision$
 */
public class FilterSyncChannel implements SyncChannel {

    private final SyncChannel next;

    public FilterSyncChannel(SyncChannel next) {
        this.next = next;
    }

    /**
     * @see org.apache.activeio.Channel#write(org.apache.activeio.packet.Packet)
     */
    public void write(Packet packet) throws IOException {
        next.write(packet);
    }

    /**
     * @see org.apache.activeio.Channel#flush()
     */
    public void flush() throws IOException {
        next.flush();
    }

    /**
     * @see org.apache.activeio.Disposable#dispose()
     */
    public void dispose() {
        next.dispose();
    }

    /**
     * @see org.apache.activeio.Service#start()
     */
    public void start() throws IOException {
        next.start();
    }

    /**
     * @see org.apache.activeio.Service#stop()
     */
    public void stop() throws IOException {
        next.stop();
    }

    /**
     * @return Returns the next.
     */
    public SyncChannel getNext() {
        return next;
    }

    /**
     * @see org.apache.activeio.packet.sync.SyncChannel#read(long)
     */
    public Packet read(long timeout) throws IOException {
        return next.read(timeout);
    }
    
    public Object getAdapter(Class target) {
        if( target.isAssignableFrom(getClass()) ) {
            return this;
        }
        return next.getAdapter(target);
    }    
    
    public String toString() {
        return next.toString();
    }
}