use of org.drools.core.rule.PredicateConstraint.PredicateContextEntry in project drools by kiegroup.
the class FieldConstraintTest method testPredicateConstraint.
/**
* <pre>
*
* (Cheese (price ?price1 )
* (Cheese (price ?price2&:(= ?price2 (* 2 ?price1) )
*
* </pre>
*/
@Test
public void testPredicateConstraint() {
InternalKnowledgeBase kBase = (InternalKnowledgeBase) KnowledgeBaseFactory.newKnowledgeBase();
StatefulKnowledgeSessionImpl ksession = (StatefulKnowledgeSessionImpl) kBase.newKieSession();
final InternalReadAccessor priceExtractor = store.getReader(Cheese.class, "price");
Pattern pattern = new Pattern(0, new ClassObjectType(Cheese.class));
// Bind the extractor to a decleration
// Declarations know the pattern they derive their value form
final Declaration price1Declaration = new Declaration("price1", priceExtractor, pattern);
pattern = new Pattern(1, new ClassObjectType(Cheese.class));
// Bind the extractor to a decleration
// Declarations know the pattern they derive their value form
final Declaration price2Declaration = new Declaration("price2", priceExtractor, pattern);
final PredicateExpression evaluator = new PredicateExpression() {
private static final long serialVersionUID = 510l;
public boolean evaluate(InternalFactHandle handle, Tuple tuple, Declaration[] previousDeclarations, Declaration[] localDeclarations, WorkingMemory workingMemory, Object context) {
int price1 = previousDeclarations[0].getIntValue((InternalWorkingMemory) workingMemory, tuple.getObject(previousDeclarations[0]));
int price2 = localDeclarations[0].getIntValue((InternalWorkingMemory) workingMemory, handle.getObject());
return (price2 == (price1 * 2));
}
public Object createContext() {
return null;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
}
public void writeExternal(ObjectOutput out) throws IOException {
}
};
final PredicateConstraint constraint1 = new PredicateConstraint(evaluator, new Declaration[] { price1Declaration }, new Declaration[] { price2Declaration });
final Cheese cheddar0 = new Cheese("cheddar", 5);
final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(cheddar0);
LeftTupleImpl tuple = new LeftTupleImpl(f0, null, true);
final Cheese cheddar1 = new Cheese("cheddar", 10);
final InternalFactHandle f1 = (InternalFactHandle) ksession.insert(cheddar1);
tuple = new LeftTupleImpl(tuple, new RightTupleImpl(f1, null), null, true);
final PredicateContextEntry context = (PredicateContextEntry) constraint1.createContextEntry();
context.updateFromTuple(ksession, tuple);
assertTrue(constraint1.isAllowedCachedLeft(context, f1));
}
use of org.drools.core.rule.PredicateConstraint.PredicateContextEntry in project drools by kiegroup.
the class FieldConstraintTest method testPredicateConstraint.
/**
* <pre>
*
* (Cheese (price ?price1 )
* (Cheese (price ?price2&:(= ?price2 (* 2 ?price1) )
*
* </pre>
*/
@Test
public void testPredicateConstraint() {
InternalKnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase();
;
StatefulKnowledgeSessionImpl ksession = (StatefulKnowledgeSessionImpl) kBase.newKieSession();
final InternalReadAccessor priceExtractor = store.getReader(Cheese.class, "price");
Pattern pattern = new Pattern(0, new ClassObjectType(Cheese.class));
// Bind the extractor to a decleration
// Declarations know the pattern they derive their value form
final Declaration price1Declaration = new Declaration("price1", priceExtractor, pattern);
pattern = new Pattern(1, new ClassObjectType(Cheese.class));
// Bind the extractor to a decleration
// Declarations know the pattern they derive their value form
final Declaration price2Declaration = new Declaration("price2", priceExtractor, pattern);
final PredicateExpression evaluator = new PredicateExpression() {
private static final long serialVersionUID = 510l;
public boolean evaluate(InternalFactHandle handle, Tuple tuple, Declaration[] previousDeclarations, Declaration[] localDeclarations, ReteEvaluator reteEvaluator, Object context) {
int price1 = previousDeclarations[0].getIntValue(reteEvaluator, tuple.getObject(previousDeclarations[0]));
int price2 = localDeclarations[0].getIntValue(reteEvaluator, handle.getObject());
return (price2 == (price1 * 2));
}
public Object createContext() {
return null;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
}
public void writeExternal(ObjectOutput out) throws IOException {
}
};
final PredicateConstraint constraint1 = new PredicateConstraint(evaluator, new Declaration[] { price1Declaration }, new Declaration[] { price2Declaration });
final Cheese cheddar0 = new Cheese("cheddar", 5);
final InternalFactHandle f0 = (InternalFactHandle) ksession.insert(cheddar0);
LeftTupleImpl tuple = new LeftTupleImpl(f0, null, true);
final Cheese cheddar1 = new Cheese("cheddar", 10);
final InternalFactHandle f1 = (InternalFactHandle) ksession.insert(cheddar1);
tuple = new LeftTupleImpl(tuple, new RightTupleImpl(f1, null), null, true);
final PredicateContextEntry context = (PredicateContextEntry) constraint1.createContextEntry();
context.updateFromTuple(ksession, tuple);
assertTrue(constraint1.isAllowedCachedLeft(context, f1));
}
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