Class ExpressionFactories

java.lang.Object

org.projog.core.predicate.builtin.clp.ExpressionFactories

public final class ExpressionFactories
extends Object

Maintains a collection of ExpressionFactory instances.

This class provides a mechanism for "plugging in" or "injecting" implementations of org.projog.clp.Expression at runtime. This mechanism provides an easy way to configure and extend the CLP expressions supported by Projog.

Each KnowledgeBase has at most one unique ClpExpressions instance.

Constructor Summary

Constructors

Constructor	Description
ExpressionFactories(KnowledgeBase kb)

Method Summary

Modifier and Type	Method	Description
void	addExpressionFactory(PredicateKey key, String operatorClassName)	Associates a ExpressionFactory with this KnowledgeBase.
org.projog.clp.Expression	toExpression(Term t, Set<org.projog.core.predicate.builtin.clp.ClpVariable> vars)

Methods inherited from class Object

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

Constructor Details

ExpressionFactories

public ExpressionFactories(KnowledgeBase kb)

Method Details

addExpressionFactory

public void addExpressionFactory(PredicateKey key,
 String operatorClassName)

Associates a ExpressionFactory with this KnowledgeBase.

Parameters:

key - The name and arity to associate the ExpressionFactory with.

operatorClassName - The class name of the ExpressionFactory to be associated with key.

Throws:

ProjogException - if there is already a ExpressionFactory associated with the PredicateKey

toExpression

public org.projog.clp.Expression toExpression(Term t,
 Set<org.projog.core.predicate.builtin.clp.ClpVariable> vars)