# MessageHandlerProvider.java

    /*
     *  Copyright (c) 2022, 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.apache.synapse.transport.util;

    import org.apache.axis2.context.MessageContext;
    import org.apache.synapse.transport.netty.BridgeConstants;

    import java.util.Objects;

    /**
     * Provider class for the {@code MessageHandler}.
     */
    public class MessageHandlerProvider {

        /**
         * Provides the suitable MessageHandler class based on the underline transport implementation, which invokes
         * this method.
         *
         * @param messageContext axis2 message context
         * @return instance of a {@code MessageHandler} that is assigned to "transport.message.handler" axis2 property.
         * Default is {@code PassThroughMessageHandler}.
         */
        public static MessageHandler getMessageHandler(MessageContext messageContext) {

            MessageHandler messageHandler =
                    (MessageHandler) messageContext.getProperty(BridgeConstants.TRANSPORT_MESSAGE_HANDLER);
            return Objects.nonNull(messageHandler) ? messageHandler : new PassThroughMessageHandler();

        }

    }