org.projog.core.predicate.builtin.clp

Class AddExpressionFactory

java.lang.Object

org.projog.core.predicate.AbstractSingleResultPredicate

org.projog.core.predicate.builtin.clp.AddExpressionFactory

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class AddExpressionFactory
extends AbstractSingleResultPredicate

pj_add_clp_expression(X,Y) - defines a Java class as an CLP expression.

X represents the name and arity of the expression. Y represents the full class name of an implementation of org.projog.core.predicate.builtin.clp.ExpressionFactory.

Constructor Summary

Constructors

Constructor and Description
AddExpressionFactory()

Method Summary

Modifier and Type	Method and Description
protected boolean	evaluate(Term functionNameAndArity, Term javaClass)
protected void	init() This method is called by AbstractSingleResultPredicate.setKnowledgeBase(KnowledgeBase).

Methods inherited from class org.projog.core.predicate.AbstractSingleResultPredicate

evaluate, evaluate, evaluate, evaluate, evaluate, getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, getPredicate, getPredicates, getProjogListeners, getSpyPoints, getTermFormatter, isRetryable, setKnowledgeBase

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.projog.core.predicate.PredicateFactory

isAlwaysCutOnBacktrack

Constructor Detail

AddExpressionFactory

public AddExpressionFactory()

Method Detail

evaluate

protected boolean evaluate(Term functionNameAndArity,
                           Term javaClass)

Overrides:

evaluate in class AbstractSingleResultPredicate

init

protected void init()

Description copied from class: AbstractSingleResultPredicate

This method is called by AbstractSingleResultPredicate.setKnowledgeBase(KnowledgeBase).

Can be overridden by subclasses to perform initialisation before any calls to AbstractSingleResultPredicate.evaluate(Term...) are made. As AbstractSingleResultPredicate.setKnowledgeBase(KnowledgeBase) will have already been called before this method is invoked, overridden versions will be able to access the KnowledgeBase using AbstractSingleResultPredicate.getKnowledgeBase().

Overrides:

init in class AbstractSingleResultPredicate