/*
 * Copyright 2013-2015 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.data.redis.connection.jedis;

import java.io.IOException;
import java.net.UnknownHostException;

import org.springframework.core.convert.converter.Converter;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.data.redis.ClusterRedirectException;
import org.springframework.data.redis.RedisConnectionFailureException;
import org.springframework.data.redis.TooManyClusterRedirectionsException;

import redis.clients.jedis.exceptions.JedisClusterMaxRedirectionsException;
import redis.clients.jedis.exceptions.JedisConnectionException;
import redis.clients.jedis.exceptions.JedisDataException;
import redis.clients.jedis.exceptions.JedisException;
import redis.clients.jedis.exceptions.JedisRedirectionException;

/**
 * Converts Exceptions thrown from Jedis to {@link DataAccessException}s
 * 
 * @author Jennifer Hickey
 * @author Thomas Darimont
 * @author Christoph Strobl
 */
public class JedisExceptionConverter implements Converter<Exception, DataAccessException> {

	/*
	 * (non-Javadoc)
	 * @see org.springframework.core.convert.converter.Converter#convert(java.lang.Object)
	 */
	public DataAccessException convert(Exception ex) {

		if (ex instanceof DataAccessException) {
			return (DataAccessException) ex;
		}
		if (ex instanceof JedisDataException) {

			if (ex instanceof JedisRedirectionException) {
				JedisRedirectionException re = (JedisRedirectionException) ex;
				return new ClusterRedirectException(re.getSlot(), re.getTargetNode().getHost(), re.getTargetNode().getPort(),
						ex);
			}

			if (ex instanceof JedisClusterMaxRedirectionsException) {
				return new TooManyClusterRedirectionsException(ex.getMessage(), ex);
			}

			return new InvalidDataAccessApiUsageException(ex.getMessage(), ex);
		}
		if (ex instanceof JedisConnectionException) {
			return new RedisConnectionFailureException(ex.getMessage(), ex);
		}
		if (ex instanceof JedisException) {
			return new InvalidDataAccessApiUsageException(ex.getMessage(), ex);
		}
		if (ex instanceof UnknownHostException) {
			return new RedisConnectionFailureException("Unknown host " + ex.getMessage(), ex);
		}
		if (ex instanceof IOException) {
			return new RedisConnectionFailureException("Could not connect to Redis server", ex);
		}

		return null;
	}
}