/*
 * Copyright 2002-2016 the original author or authors.
 *
 * 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.springframework.integration.ip.tcp.connection;

import javax.net.ssl.SSLSession;

import org.springframework.context.ApplicationEventPublisher;
import org.springframework.core.serializer.Deserializer;
import org.springframework.core.serializer.Serializer;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.ErrorMessage;

/**
 * Base class for TcpConnectionIntercepters; passes all method calls through
 * to the underlying {@link TcpConnection}.
 *
 * @author Gary Russell
 * @since 2.0
 */
public abstract class TcpConnectionInterceptorSupport extends TcpConnectionSupport implements TcpConnectionInterceptor {

	private TcpConnectionSupport theConnection;

	private TcpListener tcpListener;

	private TcpSender tcpSender;

	private Boolean realSender;

	public TcpConnectionInterceptorSupport() {
		super();
	}

	public TcpConnectionInterceptorSupport(ApplicationEventPublisher applicationEventPublisher) {
		super(applicationEventPublisher);
	}

	@Override
	public void close() {
		this.theConnection.close();
	}

	@Override
	public boolean isOpen() {
		return this.theConnection.isOpen();
	}

	@Override
	public Object getPayload() throws Exception {
		return this.theConnection.getPayload();
	}

	@Override
	public String getHostName() {
		return this.theConnection.getHostName();
	}

	@Override
	public String getHostAddress() {
		return this.theConnection.getHostAddress();
	}

	@Override
	public int getPort() {
		return this.theConnection.getPort();
	}

	@Override
	public Object getDeserializerStateKey() {
		return this.theConnection.getDeserializerStateKey();
	}

	@Override
	public void registerListener(TcpListener listener) {
		this.tcpListener = listener;
		this.theConnection.registerListener(this);
	}

	@Override
	public void registerSender(TcpSender sender) {
		this.tcpSender = sender;
		this.theConnection.registerSender(this);
	}

	@Override
	public String getConnectionId() {
		return this.theConnection.getConnectionId();
	}

	@Override
	public SocketInfo getSocketInfo() {
		return this.theConnection.getSocketInfo();
	}

	@Override
	public void run() {
		this.theConnection.run();
	}

	@Override
	public void setMapper(TcpMessageMapper mapper) {
		this.theConnection.setMapper(mapper);
	}

	@Override
	public Deserializer<?> getDeserializer() {
		return this.theConnection.getDeserializer();
	}

	@Override
	public void setDeserializer(Deserializer<?> deserializer) {
		this.theConnection.setDeserializer(deserializer);
	}

	@Override
	public Serializer<?> getSerializer() {
		return this.theConnection.getSerializer();
	}

	@Override
	public void setSerializer(Serializer<?> serializer) {
		this.theConnection.setSerializer(serializer);
	}

	@Override
	public boolean isServer() {
		return this.theConnection.isServer();
	}

	@Override
	public SSLSession getSslSession() {
		return this.theConnection.getSslSession();
	}

	@Override
	public boolean onMessage(Message<?> message) {
		if (this.tcpListener == null) {
			if (message instanceof ErrorMessage) {
				return false;
			}
			else {
				throw new NoListenerException("No listener registered for message reception");
			}
		}
		return this.tcpListener.onMessage(message);
	}

	@Override
	public void send(Message<?> message) throws Exception {
		this.theConnection.send(message);
	}

	/**
	 * Returns the underlying connection (or next interceptor)
	 * @return the connection
	 */
	public TcpConnectionSupport getTheConnection() {
		return this.theConnection;
	}

	/**
	 * Sets the underlying connection (or next interceptor)
	 * @param theConnection the connection
	 */
	public void setTheConnection(TcpConnectionSupport theConnection) {
		this.theConnection = theConnection;
	}

	/**
	 * @return the listener
	 */
	@Override
	public TcpListener getListener() {
		return this.tcpListener;
	}

	@Override
	public void addNewConnection(TcpConnection connection) {
		if (this.tcpSender != null) {
			this.tcpSender.addNewConnection(this);
		}
	}

	@Override
	public void removeDeadConnection(TcpConnection connection) {
		if (this.tcpSender != null) {
			this.tcpSender.removeDeadConnection(this);
		}
	}

	@Override
	public long incrementAndGetConnectionSequence() {
		return this.theConnection.incrementAndGetConnectionSequence();
	}

	@Override
	public TcpSender getSender() {
		return this.tcpSender;
	}

	protected boolean hasRealSender() {
		if (this.realSender != null) {
			return this.realSender;
		}
		TcpSender sender = this.getSender();
		while (sender instanceof TcpConnectionInterceptorSupport) {
			sender = ((TcpConnectionInterceptorSupport) sender).getSender();
		}
		this.realSender = sender != null;
		return this.realSender;
	}

}