/* * 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; } }