/*
 *  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.mina.core.service;

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

/**
 * An 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);

    /**
     * {@inheritDoc}
     */
    @Override
    public void sessionCreated(IoSession session) throws Exception {
        // Empty handler
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void sessionOpened(IoSession session) throws Exception {
        // Empty handler
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void sessionClosed(IoSession session) throws Exception {
        // Empty handler
    }

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

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

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

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

    /**
     * {@inheritDoc}
     */
    @Override
    public void inputClosed(IoSession session) throws Exception {
        session.closeNow();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void event(IoSession session, FilterEvent event) throws Exception {
        // Empty handler
    }
}