private static final QName KEY_Q = new QName(Constants.NULL_NAMESPACE, "key");
private static final QName SOURCE_Q = new QName(Constants.NULL_NAMESPACE, "source");
public Mediator createMediator(OMElement elem) {
ValidateMediator validateMediator = new ValidateMediator();
// process schema element definitions and create DynamicProperties
List schemaKeys = new ArrayList();
Iterator schemas = elem.getChildrenWithName(SCHEMA_Q);
while (schemas.hasNext()) {
Object o = schemas.next();
if (o instanceof OMElement) {
OMElement omElem = (OMElement) o;
OMAttribute keyAtt = omElem.getAttribute(KEY_Q);
if (keyAtt != null) {
schemaKeys.add(keyAtt.getAttributeValue());
} else {
handleException("A 'schema' definition must contain a local property 'key'");
}
} else {
handleException("Invalid 'schema' declaration for validate mediator");
}
}
if (schemaKeys.size() == 0) {
handleException("No schemas specified for the validate mediator");
} else {
validateMediator.setSchemaKeys(schemaKeys);
}
// process source XPath attribute if present
OMAttribute attSource = elem.getAttribute(SOURCE_Q);
if (attSource != null) {
try {
AXIOMXPath xp = new AXIOMXPath(attSource.getAttributeValue());
validateMediator.setSource(xp);
OMElementUtils.addNameSpaces(xp, elem, log);
} catch (JaxenException e) {
handleException("Invalid XPath expression specified for attribute 'source'", e);
}
}
// process on-fail
OMElement onFail = null;
Iterator iter = elem.getChildrenWithName(ON_FAIL_Q);
if (iter.hasNext()) {
onFail = (OMElement)iter.next();
}
if (onFail != null && onFail.getChildElements().hasNext()) {
addChildren(onFail, validateMediator);
} else {
handleException("A non-empty <on-fail> child element is required for " +
"the <validate> mediator");
}
// after successfully creating the mediator
// set its common attributes such as tracing etc
initMediator(validateMediator,elem);
// process properties
validateMediator.addAllProperties(
MediatorPropertyFactory.getMediatorProperties(elem));
return validateMediator;
}