private static final QName HEADER_Q = new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "header");
private static final QName ATT_ACTION = new QName("action");
public Mediator createMediator(OMElement elem) {
HeaderMediator headerMediator = new HeaderMediator();
OMAttribute name = elem.getAttribute(ATT_NAME);
OMAttribute value = elem.getAttribute(ATT_VALUE);
OMAttribute exprn = elem.getAttribute(ATT_EXPRN);
OMAttribute action = elem.getAttribute(ATT_ACTION);
if (name == null || name.getAttributeValue() == null) {
String msg = "A valid name attribute is required for the header mediator";
log.error(msg);
throw new SynapseException(msg);
} else {
String nameAtt = name.getAttributeValue();
int colonPos = nameAtt.indexOf(":");
if (colonPos != -1) {
// has a NS prefix.. find it and the NS it maps into
String prefix = nameAtt.substring(0, colonPos);
String namespaceURI = OMElementUtils.getNameSpaceWithPrefix(prefix, elem);
if (namespaceURI == null) {
String msg = "Invalid namespace prefix '" + prefix + "' in name attribute";
log.error(msg);
throw new SynapseException(msg);
} else {
headerMediator.setQName(new QName(namespaceURI, nameAtt.substring(colonPos+1), prefix));
}
} else {
// no prefix
headerMediator.setQName(new QName(nameAtt));
}
}
// after successfully creating the mediator
// set its common attributes such as tracing etc
processTraceState(headerMediator,elem);
// The action attribute is optional, if provided and equals to 'remove' the
// header mediator will act as a header remove mediator
if (action != null && "remove".equals(action.getAttributeValue())) {
headerMediator.setAction(HeaderMediator.ACTION_REMOVE);
}
if (headerMediator.getAction() == HeaderMediator.ACTION_SET &&
value == null && exprn == null) {
String msg = "A 'value' or 'expression' attribute is required for a [set] header mediator";
log.error(msg);
throw new SynapseException(msg);
}
if (value != null && value.getAttributeValue() != null) {
headerMediator.setValue(value.getAttributeValue());
} else if (exprn != null && exprn.getAttributeValue() != null) {
try {
AXIOMXPath xp = new AXIOMXPath(exprn.getAttributeValue());
OMElementUtils.addNameSpaces(xp, elem, log);
headerMediator.setExpression(xp);
} catch (JaxenException je) {
String msg = "Invalid XPath expression : " + exprn.getAttributeValue();
log.error(msg);
throw new SynapseException(msg, je);
}