G'day all,
[snip]
>> RelationshipHelper.lazyLoad(this,"country");
[snip]
>This does sound quite interesting, it is code you would be
>able to share
>with the project. I think I can see places where it would be useful.
I can't submit the whole shebang, as it relies on parts of our
applicatication framework. Here, though, is the main method (The logging
stuff is part of our framework too).... Every one is free to use, abuse
and/or gut the following code, should it be of any use to them.
HTH,
Charles.
/**
* If the relationship specified is not null, load the the named
* relationship
* @param o instance of an object
* @param relationshipName the name of the relationship to load
*/
public void loadRelationship(Object o, String relationshipName) {
PersistenceBroker broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
// Get the metadata
ClassDescriptor classDescriptor =
broker.getClassDescriptor(o.getClass());
ObjectReferenceDescriptor refDescriptor =
classDescriptor.getObjectReferenceDescriptorByName(relationshipName);
if (refDescriptor == null) {
refDescriptor =
classDescriptor.getCollectionDescriptorByName(relationshipName);
}
if (refDescriptor == null) {
Log.error(this, "loadRelationship - couldn't find relationship '" +
relationshipName + "'");
} else {
// Get the current value of the relationship
PersistentField persistentField = refDescriptor.getPersistentField();
Object currentValue = persistentField.get(o);
boolean loadRelationship = (currentValue == null);
if (loadRelationship) {
// Use the broker to load the data, ensuring that we do a cascade
retrieve
boolean oldCascade = refDescriptor.getCascadeRetrieve();
refDescriptor.setCascadeRetrieve(true);
broker.retrieveReference(o, relationshipName);
refDescriptor.setCascadeRetrieve(oldCascade);
} else {
// the current value is a collection proxy, and the proxy isn't
loaded, access the iterator, which will
// force it to be loaded
if (currentValue instanceof CollectionProxy) {
CollectionProxy collectionProxy = (CollectionProxy) currentValue;
if (!collectionProxy.isLoaded()) {
Iterator it = collectionProxy.ojbIterator();
}
} else {
Log.debug(this, "loadRelationship - relationship '" +
relationshipName + "' already loaded on " + o);
}
}
}
broker.close();
}
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