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Java Source Code / Java Documentation » ERP CRM Financial » SourceTap CRM » org.ofbiz.rules.engine 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.ofbiz.rules.engine.Structure
      org.ofbiz.rules.engine.Fact

All known Subclasses:   org.ofbiz.rules.engine.Atom,  org.ofbiz.rules.engine.EmptyList,
Fact
public class Fact extends Structure implements Axiom,DynamicAxiom(Code)

Title: Fact

Description: None

Copyright (c) 1999 Steven J. Metsker.

Copyright (c) 2001 The Open For Business Project - www.ofbiz.org

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

A Fact is a Structure that contains only other Facts.

For example,

 Fact s = new Fact(
 "starred",
 new Fact[]{
 new Fact("James Cagney"),
 new Fact("Yankee Doodle Dandy")});
 
The Fact class offers several convenience constructors. For example, you can create an identical fact with:
 Fact s = new Fact(
 "starred", "James Cagney", "Yankee Doodle Dandy");
 
or with:
 Fact s = new Fact(
 "starred",
 new Object[]{
 "James Cagney", "Yankee Doodle Dandy"});
 
Since they do not contain variables, Facts do not need to copy themselves when they provide a "copy" for a proof. They also avoid copying when then provide a dynamic axiom.
author:
   Steven J. Metsker
version:
   1.0


Field Summary
final protected static  DynamicRuleresolvent
     With facts, there is nothing beyond the fact itself to prove; there is nothing to resolve.

Constructor Summary
public  Fact(Object functor)
     Contructs a fact from the specified object.
public  Fact(Object functor, Object[] objects)
     Constructs a fact with the specified functor, and with terms that are atoms wrapped around the supplied objects.
public  Fact(Object functor, Fact[] terms)
     Constructs a fact with the specified functor and facts.
public  Fact(Object functor, Term[] objects)
     Although "public", this method is not for public use.

Without this constructor, or if this constructor were private,

 new Fact(
 "starred",
 new Term[]{new Fact("Cagney", "Yankee Doodle Dandy")})
 
would match the signature on Fact(Object, Object[]) , which is not what we want.
public  Fact(Object functor, Object o)
     A convenience, equivalent to new Fact(functor, new Object[]{o}).
public  Fact(Object functor, Object o1, Object o2)
     A convenience, equivalent to new Fact(functor, new Object[]{o1, o2}).

Method Summary
public  TermcopyForProof(AxiomSource ignored, Scope ignored2)
     Returns this fact.
public  DynamicAxiomdynamicAxiom(AxiomSource ignored)
     Returns this fact.
protected static  Fact[]facts(Object[] objects)
    
public  Structurehead()
     Returns this fact.
public  DynamicRuleresolvent()
    
public  Unificationunify(Fact f)
     A speedier version of unify(Structure s).

Field Detail
resolvent
final protected static DynamicRule resolvent(Code)
With facts, there is nothing beyond the fact itself to prove; there is nothing to resolve.




Constructor Detail
Fact
public Fact(Object functor)(Code)
Contructs a fact from the specified object.
Parameters:
  Object - the functor for this fact



Fact
public Fact(Object functor, Object[] objects)(Code)
Constructs a fact with the specified functor, and with terms that are atoms wrapped around the supplied objects.
Parameters:
  Object - the functor of the structure Object[] the objects to convert into atomsand use as the terms of this fact



Fact
public Fact(Object functor, Fact[] terms)(Code)
Constructs a fact with the specified functor and facts.
Parameters:
  Object - the functor of the structure Term[] the terms of this fact, which can onlybe other facts



Fact
public Fact(Object functor, Term[] objects)(Code)
Although "public", this method is not for public use.

Without this constructor, or if this constructor were private,

 new Fact(
 "starred",
 new Term[]{new Fact("Cagney", "Yankee Doodle Dandy")})
 
would match the signature on Fact(Object, Object[]) , which is not what we want. This would wrap each fact in another fact.

Allowing this constructor gives the appearance of allowing Facts with any kind of terms, including variables, which are verboten.
exception:
  RuntimeException - Cannot construct a fact fromgeneric terms;Use new Fact(functor, new Fact[]{...})




Fact
public Fact(Object functor, Object o)(Code)
A convenience, equivalent to new Fact(functor, new Object[]{o}).
Parameters:
  Object - the functor of the structure
Parameters:
  Object - the object to convert to an atomand use as the term of this fact



Fact
public Fact(Object functor, Object o1, Object o2)(Code)
A convenience, equivalent to new Fact(functor, new Object[]{o1, o2}).
Parameters:
  Object - the functor of the structure
Parameters:
  Object - an object to convert to an atomand use as the first term of this fact
Parameters:
  Object - an object to convert to an atomand use as the second term of this fact




Method Detail
copyForProof
public Term copyForProof(AxiomSource ignored, Scope ignored2)(Code)
Returns this fact. this fact



dynamicAxiom
public DynamicAxiom dynamicAxiom(AxiomSource ignored)(Code)
Returns this fact. this fact



facts
protected static Fact[] facts(Object[] objects)(Code)



head
public Structure head()(Code)
Returns this fact. this fact



resolvent
public DynamicRule resolvent()(Code)
Returns an empty resolvent a dynamic rule with nothing in it



unify
public Unification unify(Fact f)(Code)
A speedier version of unify(Structure s). either an empty Unification, indicating success,or null, indicating failure



Fields inherited from org.ofbiz.rules.engine.Structure
final public static EmptyList emptyList(Code)(Java Doc)
protected Object functor(Code)(Java Doc)
protected Term[] terms(Code)(Java Doc)

Methods inherited from org.ofbiz.rules.engine.Structure
public int arity()(Code)(Java Doc)
public boolean canFindNextProof()(Code)(Java Doc)
public Term copyForProof(AxiomSource as, Scope scope)(Code)(Java Doc)
public boolean equals(Object o)(Code)(Java Doc)
public Object eval()(Code)(Java Doc)
public boolean functorAndArityEquals(Structure s)(Code)(Java Doc)
protected static Term[] headAndTail(Term[] terms, Term tail)(Code)(Java Doc)
public boolean isList()(Code)(Java Doc)
public static Structure list(Object[] objects)(Code)(Java Doc)
public static Structure list(Term[] terms)(Code)(Java Doc)
public static Structure list(Term[] terms, Term tail)(Code)(Java Doc)
public String listTailString()(Code)(Java Doc)
protected String listTermsToString()(Code)(Java Doc)
public Term[] terms()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public Unification unify(Structure s)(Code)(Java Doc)
public Unification unify(Term t)(Code)(Java Doc)
public Unification unify(Variable v)(Code)(Java Doc)
public Unification variables()(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)

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