/*
* Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.inbound.endpoint.protocol.websocket;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelInboundHandlerAdapter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.SynapseException;
import java.lang.reflect.Constructor;
/**
* This class builds a ChannelHandler instance from the pipeline handler String
* given in the configuration file
*/
public class PipelineHandlerBuilderUtil {
private static final Log log = LogFactory.getLog(PipelineHandlerBuilderUtil.class);
/**
* build a ChannelHandler instance from a String
*
* @param handlerClass the pipeline handler class given in the configuration
* @return ChannelHandler instance of the pipeline handler
*/
public static ChannelHandler stringToPipelineHandlers(String handlerClass) {
ChannelInboundHandlerAdapter hand = null;
if (handlerClass != null) {
try {
Class c = Class.forName(handlerClass);
Constructor cons = c.getConstructor();
ChannelHandler handlerInstance = (ChannelHandler) cons.newInstance();
return handlerInstance;
} catch (ClassNotFoundException e) {
String msg = "Class " + handlerClass +
" not found. Please check the required class is added to the classpath.";
log.error(msg, e);
throw new SynapseException(e);
} catch (NoSuchMethodException e) {
String msg = "Required constructor is not implemented.";
log.error(msg, e);
throw new SynapseException(e);
} catch (InstantiationException |
IllegalAccessException |
java.lang.reflect.InvocationTargetException e) {
String msg = "Couldn't create the class instance.";
log.error(msg, e);
throw new SynapseException(e);
}
}
return hand;
}
}