/*
* Copyright (c) 2012. The Genome Analysis Centre, Norwich, UK
* MISO project contacts: Robert Davey, Mario Caccamo @ TGAC
* *********************************************************************
*
* This file is part of MISO.
*
* MISO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MISO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MISO. If not, see <http://www.gnu.org/licenses/>.
*
* *********************************************************************
*/
package uk.ac.bbsrc.tgac.miso.notification.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.integration.Message;
import org.springframework.integration.MessagingException;
import org.springframework.integration.support.MessageBuilder;
import org.springframework.integration.transformer.HeaderEnricher;
import java.util.HashMap;
import java.util.Map;
/**
* uk.ac.bbsrc.tgac.miso.notification.util
* <p/>
* Info
*
* @author Rob Davey
* @date 09/02/12
* @since 0.1.6
*/
public class NotificationMessageEnricher extends HeaderEnricher {
protected static final Logger log = LoggerFactory.getLogger(NotificationMessageEnricher.class);
private final Map<String, ? extends HeaderValueMessageProcessor<?>> newHeadersToAdd;
public NotificationMessageEnricher(Map<String, ? extends HeaderValueMessageProcessor<?>> headersToAdd) {
this.newHeadersToAdd = (headersToAdd != null) ? headersToAdd
: new HashMap<String, HeaderValueMessageProcessor<Object>>();
}
@Override
public Message<?> transform(Message<?> message) {
try {
Map<String, Object> headerMap = new HashMap<String, Object>(message.getHeaders());
log.debug("CURRENT HEADERS: " + headerMap.toString());
for (Map.Entry<String, ? extends HeaderValueMessageProcessor<?>> entry : this.newHeadersToAdd.entrySet()) {
String key = entry.getKey();
HeaderValueMessageProcessor<?> valueProcessor = entry.getValue();
boolean headerDoesNotExist = headerMap.get(key) == null;
/**
* Only evaluate value expression if necessary
*/
if (headerDoesNotExist) {
Object value = valueProcessor.processMessage(message);
if (value != null) {
headerMap.put(key, value);
}
}
}
Message newMessage = MessageBuilder.withPayload(message.getPayload()).copyHeaders(headerMap).build();
log.debug("NEW HEADERS: " + newMessage.getHeaders().toString());
return super.transform(newMessage);
}
catch (Exception e) {
throw new MessagingException(message, "failed to transform message headers", e);
}
}
}