/**
* Loads any custom operators and annotation accessors into the ConstraintFactory.
*
* @throws ResourceInstantiationException
*/
protected void initCustomConstraints() throws ResourceInstantiationException {
// Load operators
if (operators != null) {
for (String opName : operators) {
Class<? extends ConstraintPredicate> clazz = null;
try {
clazz =
Class.forName(opName, true, Gate.getClassLoader())
.asSubclass(ConstraintPredicate.class);
} catch (ClassNotFoundException e) {
// if couldn't find it that way, try with current thread class loader
try {
clazz =
Class.forName(opName, true, Thread.currentThread().getContextClassLoader())
.asSubclass(ConstraintPredicate.class);
} catch (ClassNotFoundException e1) {
throw new ResourceInstantiationException(
"Cannot load class for operator: " + opName, e1);
}
} catch (ClassCastException cce) {
throw new ResourceInstantiationException(
"Operator class '" + opName + "' must implement ConstraintPredicate");
}
// instantiate an instance of the class so can get the operator string
try {
ConstraintPredicate predicate = clazz.newInstance();
String opSymbol = predicate.getOperator();
// now store it in ConstraintFactory
Factory.getConstraintFactory().addOperator(opSymbol, clazz);
} catch (Exception e) {
throw new ResourceInstantiationException(
"Cannot instantiate class for operator: " + opName, e);
}
}
}
// Load annotationAccessors
if (annotationAccessors != null) {
for (String accessorName : annotationAccessors) {
Class<? extends AnnotationAccessor> clazz = null;
try {
clazz =
Class.forName(accessorName, true, Gate.getClassLoader())
.asSubclass(AnnotationAccessor.class);
} catch (ClassNotFoundException e) {
// if couldn't find it that way, try with current thread class loader
try {
clazz =
Class.forName(accessorName, true, Thread.currentThread().getContextClassLoader())
.asSubclass(AnnotationAccessor.class);
} catch (ClassNotFoundException e1) {
throw new ResourceInstantiationException(
"Cannot load class for accessor: " + accessorName, e1);
}
} catch (ClassCastException cce) {
throw new ResourceInstantiationException(
"Operator class '" + accessorName + "' must implement AnnotationAccessor");
}
// instantiate an instance of the class so can get the meta-property name string
try {
AnnotationAccessor aa = clazz.newInstance();
String accSymbol = (String) aa.getKey();
// now store it in ConstraintFactory
Factory.getConstraintFactory().addMetaProperty(accSymbol, clazz);
} catch (Exception e) {
throw new ResourceInstantiationException(
"Cannot instantiate class for accessor: " + accessorName, e);
}
}
}
}
