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Java Source Code / Java Documentation » Rule Engine » Mandarax » org.mandarax.reference   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.mandarax.kernel.LObject       org.mandarax.reference.Complex          org.mandarax.reference.FactImpl All known Subclasses:   org.mandarax.reference.PrerequisiteImpl, FactImpl public class FactImpl extends Complex implements Fact,Query(Code) Reference implementation for (simple) facts. In older versions (prior to 1.9) there was no separate Query interface/class - facts were used instead. In order to facilitate maintanance of older applications, this class still implements Query. Some newer features, in particular DerivationEventListeners, are not supported. For queries, QueryImpl should be used instead. See Also:   QueryImpl author:    Jens Dietrich version:    3.4 <7 March 05> since:    1.1 since:    Prova re-integration modifications author:    Alex Kozlenkov version:    3.4 <7 March 05> Constructor Summary public   FactImpl()      Constructor.   FactImpl(org.mandarax.kernel.Predicate p)      Constructor.   FactImpl(org.mandarax.kernel.Predicate p, Term[] t)      Constructor. Method Summary public  void addClauseSetChangeListener(ClauseSetChangeListener l)      Add a clause set listener. public  Clause apply(java.util.Collection r)      Apply a set of replacements to a clause. public  Clause apply(Replacement r)      Apply a single replacement to a fact. 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  org.mandarax.util.ClauseIterator clauses()      Get an iterator for clauses. public  org.mandarax.util.ClauseIterator clauses(Clause query, Object additionalParameter)      Get an iterator for clauses. protected  void copyStructure(FactImpl f)      Copy the structure, i.e. public  boolean equals(Object obj)      Check whether objects are equal. protected  void fireClauseSetChangeEvent(ClauseSetChangeEvent e)      protected  org.mandarax.kernel.Constructor getConstructor()      Get the object constructing the complex. public  ClauseSet getContainer()      Get the clause set containing the clause. public  DerivationEventListener[] getDerivationEventListeners()      Get the registered derivation event listeners. public  Fact[] getFacts()      Get the facts. public  Object getKey()      Get a key for fast access. public  String getName()      Get the common name of this query, i.e., something like "Find the oncle of a person". public  java.util.List getNegativeLiterals()      Get the negative literals. public  java.util.List getPositiveLiterals()      Get the positive literals. public  org.mandarax.kernel.Predicate getPredicate()      Get the predicate. public  Properties getProperties()      Get the properties as one "properties" instance. public  String getProperty(String key)      Get a property. Parameters:   key - the property key the respective value. public  int hashCode()      Get the hash code of a fact. public  boolean isAtomic()      Indicates whether the clause is atomic. public  boolean isBound()      public  boolean isEmpty()      Indicates whether the clause is the empty clause. public  boolean isExecutable()      Indicates whether the object (usually a term or a clause set) can be performed using the java semantics. public  boolean isGround()      Indicates whether the clause is ground (= does not have variables). public  boolean isNegatedAF()      public  Iterator predicates()      Get an iterator iterating over the predicates contained in this clause set. public  Enumeration propertyNames()      Returns an enumeration of all the keys in this property list, including distinct keys in the default property list if a key of the same name has not already been found from the main properties list. public  void removeClauseSetChangeListener(ClauseSetChangeListener l)      Remove a clause set listener. public  Object removeProperty(String key)      Remove a property. public  Object resolve(Session session)      Resolve a fact: if supported, the predicate should be performed using its semantic. public  void setContainer(ClauseSet aContainer)      Set a container. public  void setDerivationEventListeners(DerivationEventListener[] listeners)      Set the derivation event listeners. public  void setFacts(Fact[] facts)      Set the facts. public  void setName(String queryName)      Set the common name of this query. public  void setPredicate(org.mandarax.kernel.Predicate p)      Set a new predicate. public  void setProperties(Properties properties)      Set the properties. public  Object setProperty(String key, String value)      Set a property. Constructor Detail FactImpl public FactImpl()(Code) Constructor. FactImpl FactImpl(org.mandarax.kernel.Predicate p)(Code) Constructor. Parameters:   p - the predicate FactImpl FactImpl(org.mandarax.kernel.Predicate p, Term[] t)(Code) Constructor. Parameters:   p - the predicate Parameters:   t - the terms Method Detail addClauseSetChangeListener public void addClauseSetChangeListener(ClauseSetChangeListener l)(Code) Add a clause set listener. Parameters:   l - a listener apply public Clause apply(java.util.Collection r)(Code) Apply a set of replacements to a clause. Returns a new clause! the fact (clause) resulting from the application of the replacements Parameters:   r - a collection of replacements apply public Clause apply(Replacement r)(Code) Apply a single replacement to a fact. Returns a new clause! the fact (clause) resulting from the application of the replacemen Parameters:   r - the replacement applyToFact public Fact applyToFact(java.util.Collection r)(Code) Apply a set of replacements to a fact. Returns a new fact! the fact resulting from the application of the replacement Parameters:   r - a collection of replacement applyToFact public Fact applyToFact(Replacement r)(Code) Apply a single replacement to a fact. Returns a new fact! the fact (clause) resulting from the application of the replacement Parameters:   r - a replacement clauses public org.mandarax.util.ClauseIterator clauses()(Code) Get an iterator for clauses. a clause iterator clauses public org.mandarax.util.ClauseIterator clauses(Clause query, Object additionalParameter)(Code) Get an iterator for clauses. The parameters are ignored and clauses() is called! a clause iterator Parameters:   query - a query Parameters:   additionalParameter - an additional parameter copyStructure protected void copyStructure(FactImpl f)(Code) Copy the structure, i.e. length of the terms, types of the terms and methods, Parameters:   f - the fact that takes the structure from this object equals public boolean equals(Object obj)(Code) Check whether objects are equal. Parameters:   obj - the object to compare this object with true if the objects are equal, false otherwise fireClauseSetChangeEvent protected void fireClauseSetChangeEvent(ClauseSetChangeEvent e)(Code) Fire a clause set change event Parameters:   e - the event getConstructor protected org.mandarax.kernel.Constructor getConstructor()(Code) Get the object constructing the complex. the predicate of this fact getContainer public ClauseSet getContainer()(Code) Get the clause set containing the clause. This method is in particular useful for analyzing derivations, since derivations show only the clauses used, not the clause set generating this clauses (e.g., AutoFacts). On the other hand, knowledge bases contain often clause sets. So it could be hard to find the clause sets in the knowledge base that caused a certain result. For some clauses such as facts, the container is just the fact itself. a clause set getDerivationEventListeners public DerivationEventListener[] getDerivationEventListeners()(Code) Get the registered derivation event listeners. an array of listeners getFacts public Fact[] getFacts()(Code) Get the facts. See Also:   org.mandarax.kernel.Query an array of facts 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! the key object getName public String getName()(Code) Get the common name of this query, i.e., something like "Find the oncle of a person". a string getNegativeLiterals public java.util.List getNegativeLiterals()(Code) Get the negative literals. the collection of negative literals, this is an empty collection! getPositiveLiterals public java.util.List getPositiveLiterals()(Code) Get the positive literals. the collection of positive literals, this is a singleton containing only this object getPredicate public org.mandarax.kernel.Predicate getPredicate()(Code) Get the predicate. the predicate getProperties public Properties getProperties()(Code) Get the properties as one "properties" instance. a properties instance getProperty public String getProperty(String key)(Code) Get a property. Parameters:   key - the property key the respective value. The method returns null if the property is not found. hashCode public int hashCode()(Code) Get the hash code of a fact. the hash value isAtomic public boolean isAtomic()(Code) Indicates whether the clause is atomic. a boolean isBound public boolean isBound()(Code) Whether the fact contains variables boolean isEmpty public boolean isEmpty()(Code) Indicates whether the clause is the empty clause. false isExecutable public boolean isExecutable()(Code) Indicates whether the object (usually a term or a clause set) can be performed using the java semantics. a boolean isGround public boolean isGround()(Code) Indicates whether the clause is ground (= does not have variables). a boolean isNegatedAF public boolean isNegatedAF()(Code) Indicates whether the fact is negated (negation as failure) always false See Also:   PrerequisiteImpl predicates public Iterator predicates()(Code) Get an iterator iterating over the predicates contained in this clause set. an iterator propertyNames public Enumeration propertyNames()(Code) Returns an enumeration of all the keys in this property list, including distinct keys in the default property list if a key of the same name has not already been found from the main properties list. an enumeration of all the keys in this property list, including the keys inthe default property list removeClauseSetChangeListener public void removeClauseSetChangeListener(ClauseSetChangeListener l)(Code) Remove a clause set listener. Parameters:   l - a listener removeProperty public Object removeProperty(String key)(Code) Remove a property. Parameters:   key - the property key the value to which the key had been mapped, or null if the key did not have a mapping. 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. Parameters:   session - a session object the result of resolving the term throws:   java.lang.UnsupportedOperationException - throws:   java.lang.IllegalArgumentException - setContainer public void setContainer(ClauseSet aContainer)(Code) Set a container. Parameters:   aContainerthe - new container setDerivationEventListeners public void setDerivationEventListeners(DerivationEventListener[] listeners)(Code) Set the derivation event listeners. Parameters:   listeners - listeners setFacts public void setFacts(Fact[] facts)(Code) Set the facts. Not supported by facts, throws an exception! Please use QueryImpl for queries! See Also:   org.mandarax.kernel.Query Parameters:   facts - an array of facts setName public void setName(String queryName)(Code) Set the common name of this query. Parameters:   a - name setPredicate public void setPredicate(org.mandarax.kernel.Predicate p)(Code) Set a new predicate. Parameters:   p - the predicate setProperties public void setProperties(Properties properties)(Code) Set the properties. Not required by the interface, but useful for bean (introspection-) based tools. Parameters:   properties - the properties setProperty public Object setProperty(String key, String value)(Code) Set a property. Parameters:   key - the key Parameters:   value - the value the previous value of the specified key in this property list, or null if it did not have one. Fields inherited from org.mandarax.reference.Complex protected Term[] terms(Code)(Java Doc) protected Class[] types(Code)(Java Doc) Methods inherited from org.mandarax.reference.Complex abstract protected Constructor getConstructor()(Code)(Java Doc) public Term[] getTerms()(Code)(Java Doc) public void setTerm(Term t, int i)(Code)(Java Doc) public void setTerms(Term[] t)(Code)(Java Doc) public TermIterator terms()(Code)(Java Doc) public String toString()(Code)(Java Doc) Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)