I am preparing to port our software to use castor 1.1.1 and I have
one Castor customization that I think may be useful for the main
release. It allows you to specify an object in your application (a
delegate) that listens to attributes as they are being unmarshalled.
I have created an interface called AttributeListener that defines a
single method:
public interface AttributeListener {
public void processAttribute(String attName, String attValue)
}
Simply implement this on a class in your application and tell the
unmarshaller to use your object as the attribute listener. When
objects are unmarshalled, your method gets called and gives you a
chance to monitor the attributes being loaded in. In the example
below, the "ID" attribute and it's value are stored in a map. After
the object has been fully unmarshalled, a substitution is performed
on the object. This is useful in an application which has a master
document that imports template documents.
public MyClass implements AttributeListener {
...
public void processAttribute(String attName, String attValue) {
if (attName.equals("ID") == true) {
String newValue;
newValue = org.myproject.ObjectType.newObjectID();
// key = old ID, value = new ID
oldIDtoNewIDMap.put(attValue, newValue);
}
}
...
}
I am not aware of a way to do this without a customized Castor. If
there is enough interest, I will submit a patch.
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