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The Core Camel Java DSL based router
/**
* 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.processor;
import org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.impl.DefaultMessage;
import org.apache.camel.spi.IdAware;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.AsyncProcessorHelper;
import org.apache.camel.util.ExchangeHelper;
import org.apache.camel.util.IOHelper;
import org.apache.camel.util.ObjectHelper;
/**
* A processor which converts the payload of the input message to be of the given type
*
* If the conversion fails an {@link org.apache.camel.InvalidPayloadException} is thrown.
*
* @version
*/
public class ConvertBodyProcessor extends ServiceSupport implements AsyncProcessor, IdAware {
private String id;
private final Class type;
private final String charset;
public ConvertBodyProcessor(Class type) {
ObjectHelper.notNull(type, "type", this);
this.type = type;
this.charset = null;
}
public ConvertBodyProcessor(Class type, String charset) {
ObjectHelper.notNull(type, "type", this);
this.type = type;
this.charset = IOHelper.normalizeCharset(charset);
}
@Override
public String toString() {
return "convertBodyTo[" + type.getCanonicalName() + "]";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public void process(Exchange exchange) throws Exception {
AsyncProcessorHelper.process(this, exchange);
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
boolean out = exchange.hasOut();
Message old = out ? exchange.getOut() : exchange.getIn();
if (old.getBody() == null) {
// only convert if the is a body
callback.done(true);
return true;
}
if (charset != null) {
// override existing charset with configured charset as that is what the user
// have explicit configured and expects to be used
exchange.setProperty(Exchange.CHARSET_NAME, charset);
}
// use mandatory conversion
Object value;
try {
value = old.getMandatoryBody(type);
} catch (Throwable e) {
exchange.setException(e);
callback.done(true);
return true;
}
// create a new message container so we do not drag specialized message objects along
// but that is only needed if the old message is a specialized message
boolean copyNeeded = !(old.getClass().equals(DefaultMessage.class));
if (copyNeeded) {
Message msg = new DefaultMessage();
msg.copyFromWithNewBody(old, value);
// replace message on exchange
ExchangeHelper.replaceMessage(exchange, msg, false);
} else {
// no copy needed so set replace value directly
old.setBody(value);
}
// remove charset when we are done as we should not propagate that,
// as that can lead to double converting later on
if (charset != null) {
exchange.removeProperty(Exchange.CHARSET_NAME);
}
callback.done(true);
return true;
}
public Class getType() {
return type;
}
public String getCharset() {
return charset;
}
@Override
protected void doStart() throws Exception {
// noop
}
@Override
protected void doStop() throws Exception {
// noop
}
}