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Java Source Code / Java Documentation » Rule Engine » Mandarax » org.mandarax.kernel

Source Cross Reference

Class Diagram

Java Document (Java Doc)

org.mandarax.kernel .Fact

All known Subclasses:   org.mandarax.reference .FactImpl,
Fact
public interface Fact extends Clause,TermContainer(Code)
Interface representing facts. Instances are usually created using a factory. Note that we use facts also as prerequisites and conclusion(s) in rules.
See Also:   org.mandarax.kernel.Rule
See Also:   org.mandarax.kernel.LogicFactory
author:
   Jens Dietrich
version:
   3.4 <7 March 05>
since:
   1.0

Method Summary
public Fact applyToFact(java.util.Collection r)
     Apply a set of replacements to a fact.
public Fact applyToFact(Replacement r)
     Apply a single replacement to a fact.
public Object getKey()
     Get a key for fast access.
public org.mandarax.kernel.Predicate getPredicate()
     Get the predicate.
boolean isNegatedAF()

public Object resolve(Session session)
     Resolve a fact: if supported, the predicate should be performed using its semantic.
public void setPredicate(org.mandarax.kernel.Predicate p)
     Set a new predicate.

Method Detail
applyToFact
public Fact applyToFact(java.util.Collection r)(Code)
Apply a set of replacements to a fact. Returns a new fact!
See Also:   org.mandarax.kernel.Replacement the fact that is the result of the application of replacements
Parameters:
  r - the collection of replacements

applyToFact
public Fact applyToFact(Replacement r)(Code)
Apply a single replacement to a fact. Return a new fact! the fact that is the result of the application of the replacement
Parameters:
  r - the replacement applied

getKey
public Object getKey()(Code)
Get a key for fast access. The key is usually the predicate, but subclasses might want to use different keys. Note that keys are mainly used by inference engines and knowledge bases to improve performance and inference engine and knowledge bases must know about the semantics of keys to use them correctly!
See Also:   org.mandarax.kernel.KnowledgeBase
See Also:   org.mandarax.kernel.Clause.getKey the key object

getPredicate
public org.mandarax.kernel.Predicate getPredicate()(Code)
Get the predicate. the predicate

isNegatedAF
boolean isNegatedAF()(Code)
Indicates whether the fact is negated (negation as failure) true if the fact is negated, false otherwise

resolve
public Object resolve(Session session) throws UnsupportedOperationException, IllegalArgumentException(Code)
Resolve a fact: if supported, the predicate should be performed using its semantic. E.g., for a fact like isFather(Max,Jens) the function isFather is performed for the objects (constant terms) Max and Jens and the result (e.g., true) is returned. Note that not all predicates support this (since not all predicates have a semantic), and the operation can also fail in case one term is variable. In these cases we throw appropriate exceptions.
See Also:   org.mandarax.kernel.Constructor.perform
Parameters:
  session - a session object the resulting object, usually true or false
throws:
  java.lang.UnsupportedOperationException - - thrown if not supported
throws:
  java.lang.IllegalArgumentException -

setPredicate
public void setPredicate(org.mandarax.kernel.Predicate p)(Code)
Set a new predicate.
Parameters:
  p - the new predicate

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