/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * 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.mina.core.service;

import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * An abstract adapter class for {@link IoHandler}.  You can extend this
 * class and selectively override required event handler methods only.  All
 * methods do nothing by default.
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class IoHandlerAdapter implements IoHandler {
    private static final Logger LOGGER = LoggerFactory.getLogger(IoHandlerAdapter.class);

    public void sessionCreated(IoSession session) throws Exception {
        // Empty handler
    }

    public void sessionOpened(IoSession session) throws Exception {
        // Empty handler
    }

    public void sessionClosed(IoSession session) throws Exception {
        // Empty handler
    }

    public void sessionIdle(IoSession session, IdleStatus status)
            throws Exception {
        // Empty handler
    }

    public void exceptionCaught(IoSession session, Throwable cause)
            throws Exception {
        if (LOGGER.isWarnEnabled()) {
            LOGGER.warn("EXCEPTION, please implement "
                    + getClass().getName()
                    + ".exceptionCaught() for proper handling:", cause);
        }
    }

    public void messageReceived(IoSession session, Object message)
            throws Exception {
        // Empty handler
    }

    public void messageSent(IoSession session, Object message) throws Exception {
        // Empty handler
    }
}