/**
* INTERNAL Return true if it uses a cast class and query is downcasting. It will look into
* inheritance hierarchy of the root descriptor.
*/
public boolean isDowncast(ClassDescriptor rootDescriptor, AbstractSession session) {
if (castClass == null) {
return false;
}
if (rootDescriptor.getJavaClass() == castClass) {
return false;
}
ClassDescriptor castDescriptor = session.getClassDescriptor(castClass);
if (castDescriptor == null) {
throw QueryException.couldNotFindCastDescriptor(castClass, getBaseExpression());
}
if (castDescriptor.getInheritancePolicy() == null) {
throw QueryException.castMustUseInheritance(getBaseExpression());
}
ClassDescriptor parentDescriptor = castDescriptor.getInheritancePolicy().getParentDescriptor();
while (parentDescriptor != null) {
if (parentDescriptor == rootDescriptor) {
return true;
}
parentDescriptor = parentDescriptor.getInheritancePolicy().getParentDescriptor();
}
throw QueryException.couldNotFindCastDescriptor(castClass, getBaseExpression());
}
/**
* INTERNAL Return the descriptor which contains this query key, look in the inheritance hierarchy
* of rootDescriptor for the descriptor.
*/
public ClassDescriptor convertToCastDescriptor(
ClassDescriptor rootDescriptor, AbstractSession session) {
if (castClass == null || rootDescriptor == null || rootDescriptor.getJavaClass() == castClass) {
return rootDescriptor;
}
ClassDescriptor castDescriptor = session.getClassDescriptor(castClass);
if (castDescriptor == null) {
throw QueryException.couldNotFindCastDescriptor(castClass, getBaseExpression());
}
if (!castDescriptor.hasInheritance()) {
throw QueryException.castMustUseInheritance(getBaseExpression());
}
ClassDescriptor parentDescriptor = castDescriptor.getInheritancePolicy().getParentDescriptor();
while (parentDescriptor != null) {
if (parentDescriptor == rootDescriptor) {
return castDescriptor;
}
parentDescriptor = parentDescriptor.getInheritancePolicy().getParentDescriptor();
}
ClassDescriptor childDescriptor = rootDescriptor;
while (childDescriptor != null) {
if (childDescriptor == castDescriptor) {
return rootDescriptor;
}
childDescriptor = childDescriptor.getInheritancePolicy().getParentDescriptor();
}
throw QueryException.couldNotFindCastDescriptor(castClass, getBaseExpression());
}
/**
* INTERNAL - Return the descriptor which contains this query key, look in the inheritance
* hierarchy of rootDescriptor for the descriptor. Does not set the descriptor, only returns it.
*/
public ClassDescriptor convertToCastDescriptor(
ClassDescriptor rootDescriptor, AbstractSession session) {
isDowncast = Boolean.FALSE;
if (castClass == null || rootDescriptor == null || rootDescriptor.getJavaClass() == castClass) {
return rootDescriptor;
}
ClassDescriptor castDescriptor = session.getClassDescriptor(castClass);
if (castDescriptor == null) {
throw QueryException.couldNotFindCastDescriptor(castClass, getBaseExpression());
}
if (!castDescriptor.hasInheritance()) {
throw QueryException.castMustUseInheritance(getBaseExpression());
}
ClassDescriptor parentDescriptor = castDescriptor.getInheritancePolicy().getParentDescriptor();
while (parentDescriptor != null) {
if (parentDescriptor == rootDescriptor) {
isDowncast = Boolean.TRUE;
return castDescriptor;
}
parentDescriptor = parentDescriptor.getInheritancePolicy().getParentDescriptor();
}
// is there value casting an emp to person in a query?
ClassDescriptor childDescriptor = rootDescriptor;
while (childDescriptor != null) {
if (childDescriptor == castDescriptor) {
return rootDescriptor;
}
childDescriptor = childDescriptor.getInheritancePolicy().getParentDescriptor();
}
throw QueryException.couldNotFindCastDescriptor(castClass, getBaseExpression());
}