|
Determining If View Attribute Is From Primary Entity
A customer asked if there is a way to determine whether a view object attribute is from the primary entity for its view object, or not. The three methods in this framework extension class illustrate a method that can get the job done:
package demo.fwkext;
import oracle.jbo.AttributeDef;
import oracle.jbo.server.EntityDefImpl;
import oracle.jbo.server.ViewAttributeDefImpl;
import oracle.jbo.server.ViewObjectImpl;
public class CustomViewObjectImpl extends ViewObjectImpl {
private boolean isAttributeFromPrimaryEntity(AttributeDef attrDef) {
EntityDefImpl[] defs = getEntityDefs();
return ((defs != null) && (defs.length > 0))
? (((ViewAttributeDefImpl) attrDef).getEntityDef() == defs[0]) : false;
}
public boolean isAttributeFromPrimaryEntity(int attrSlot) {
return isAttributeFromPrimaryEntity(getAttributeDef(attrSlot));
}
public boolean isAttributeFromPrimaryEntity(String attrName) {
return isAttributeFromPrimaryEntity(findAttributeDef(attrName));
}
}
You can use this method by passing it either an attribute name as a string, or an attribute integer index "slot number". It works by comparing the view attribute definitions EntityDefImpl object with the first EntityDefImpl object in the ViewObject definition (if there is one).
|
