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Camel MINA support
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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.camel.component.mina;

import org.apache.camel.Exchange;
import org.apache.camel.impl.DefaultExchangeHolder;

/**
 * Helper to get and set the correct payload when transferring data using camel-mina.
 * Always use this helper instead of direct access on the exchange object.
 * 
 * This helper ensures that we can also transfer exchange objects over the wire using the
 * transferExchange=true option.
 *
 * @version 
 */
public final class MinaPayloadHelper {

    private MinaPayloadHelper() {
        //Utility Class
    }

    public static Object getIn(MinaEndpoint endpoint, Exchange exchange) {
        if (endpoint.getConfiguration().isTransferExchange()) {
            // we should transfer the entire exchange over the wire (includes in/out)
            return DefaultExchangeHolder.marshal(exchange);
        } else {
            // normal transfer using the body only
            return exchange.getIn().getBody();
        }
    }

    public static Object getOut(MinaEndpoint endpoint, Exchange exchange) {
        if (endpoint.getConfiguration().isTransferExchange()) {
            // we should transfer the entire exchange over the wire (includes in/out)
            return DefaultExchangeHolder.marshal(exchange);
        } else {
            // normal transfer using the body only
            return exchange.getOut().getBody();
        }
    }

    public static void setIn(Exchange exchange, Object payload) {
        if (payload instanceof DefaultExchangeHolder) {
            DefaultExchangeHolder.unmarshal(exchange, (DefaultExchangeHolder) payload);
        } else {
            // normal transfer using the body only
            exchange.getIn().setBody(payload);
        }
    }

    public static void setOut(Exchange exchange, Object payload) {
        if (payload instanceof DefaultExchangeHolder) {
            DefaultExchangeHolder.unmarshal(exchange, (DefaultExchangeHolder) payload);
        } else {
            // normal transfer using the body only and preserve the headers
            exchange.getOut().setHeaders(exchange.getIn().getHeaders());
            exchange.getOut().setBody(payload);
        }
    }
}