Re: [Info-gnuprologjava] Problem of Creating queries having a term involving function symbols

[Daniel Thomas]

Hello,

Yes it is possible, you create a compound term using "," as the functor.
A more detailed response will have to wait until I have more time.

Daniel

On Thu, 2012-04-19 at 10:31 +0530, Suman Roy wrote:
> Hi Daniel,
> 
> I have sent the following mail to you. Do you think will it be possible to 
> generate the following query using JAVA APIs, other can we use something else?
> 
> Regards,
> --Suman
> --------------------------------------------------------------------------------------------------
> 
> Hello,
> 
> Thanks a lot. It worked. 
> 
> However, we are finding it difficult to generate query which is a conjunction 
> of literals! For example, we are trying to generate the following query using 
> the JAVA API:
> 
> :- isSonOf(brother(Paul), John), hasGrandson(John, _). 
> 
> We shall appreciate any suggestion from you.
> 
> Regards,
> --Suman
> 
> Suman Roy, Ph.D.
> Infosys LABS, 
> Infosys Technologies Ltd.,
> Bangalore, India.     
> Mob. +91 98860 23203 
> 
> 
> 
> -----Original Message-----
> From: Daniel Thomas [mailto:address@hidden 
> Sent: Saturday, April 14, 2012 1:21 PM
> To: Suman Roy
> Cc: Jagadish Koneti
> Subject: RE: [Info-gnuprologjava] Problem of Creating queries having a term 
> involving function symbols
> 
> constructor
> CompoundTerm(gnu.prolog.term.CompoundTermTag,gnu.prolog.term.CompoundTerm,gnu.prolog.term.Term[])
> Note that you have a Term[] rather than a Term as the last argument because 
> t2 is a Term[] rather than a Term. If you don't create it as an array but 
> rather than just as a Term then this should work.
> 
> Daniel
> 
> On Fri, 2012-04-13 at 16:07 +0530, Suman Roy wrote:
> > Hi,
> > 
> > Thanks. 
> > 
> > We just tried. But still encountered the following problem.
> > 
> > Error : 
> > 
> > Cannot find symbol
> > Symbol : constructor 
> > CompoundTerm(gnu.prolog.term.CompoundTermTag,gnu.prolog.term.CompoundT
> > erm,gnu.prolog.term.Term[]) Location : class 
> > gnu.prolog.term.CompoundTerm
> > 
> > Is there any way out of it?
> > 
> > Regards,
> > --Suman
> > 
> > 
> > Suman Roy, Ph.D.
> > Infosys LABS,
> > Infosys Technologies Ltd.,
> > Bangalore, India.     
> > Mob. +91 98860 23203
> > 
> > 
> > -----Original Message-----
> > From: Daniel Thomas [mailto:address@hidden
> > Sent: Friday, April 13, 2012 4:01 PM
> > To: Suman Roy
> > Cc: Jagadish Koneti
> > Subject: RE: [Info-gnuprologjava] Problem of Creating queries having a 
> > term involving function symbols
> > 
> > Ahh ok,
> > 
> > > CompoundTerm goalTerm=new CompoundTerm("isSonOf",ct1,t2);
> > Which constructor are you trying to call? Your calling signature is 
> > (String, Term, Term) but there is no constructor with that signature, hence 
> > the compilation error.
> > Try something like:
> > CompoundTerm goalTerm=new 
> > CompoundTerm(CompoundTermTag.get("isSonOf",2),ct1,t2);
> > Which should work modulo any typos.
> > 
> > I hope that helps,
> > 
> > Daniel
> > 
> > On Fri, 2012-04-13 at 11:53 +0530, Suman Roy wrote:
> > > Hello,
> > > 
> > > Thanks a lot for your mail. However we are still facing some problem with 
> > > this.
> > > 
> > > 
> > > As I wrote to you earlier that we are trying to create query with a term 
> > > having function symbols inside a predicate. 
> > > 
> > > For example, consider generating  a query  predicate " 
> > > isSonOf(brother(Paul), John)" to the Prolog reasoner with the help 
> > > of the API ( “gnuprologjava-0.2.5 ” ) . For this we have constructed 
> > > a CompundTerm as " brother(paul )" by writing
> > > 
> > >   “”
> > > Term t1[]={AtomTerm.get("paul")};
> > >    CompoundTerm ct1 =new CompoundTerm("brother",t1);
> > > 
> > > “”
> > > After that we are trying to write compound term which will 
> > > encapsulate both “ brother(paul) ” and “ john ” by writing
> > >  
> > > “” 
> > >  CompoundTerm goalTerm=new CompoundTerm("isSonOf",ct1,t2);
> > > 
> > > “”
> > > 
> > > But this kind of compoundTerm object inside a compundTerm object is not 
> > > allowed by the API ( “gnuprologjava-0.2.5 ” ) . hence we are getting 
> > > compilation error .
> > > 
> > > Kindly suggest on how to use such compoundTerm object within a compound 
> > > term object with the help of  API .
> > > 
> > > Here is the code snippet.
> > > 
> > > ====================================================================
> > > ==
> > > ================
> > > import gnu.prolog.term.AtomTerm;
> > > import gnu.prolog.term.CompoundTerm; import 
> > > gnu.prolog.term.CompoundTermTag; import gnu.prolog.term.Term; import 
> > > gnu.prolog.vm.Environment; import gnu.prolog.vm.Interpreter; import 
> > > gnu.prolog.vm.PrologCode; import gnu.prolog.vm.PrologException; 
> > > import java.util.logging.Level; import java.util.logging.Logger; 
> > > import javax.swing.JOptionPane;
> > > 
> > > 
> > > public class settingupQuery {
> > > 
> > >     public static void main (String []args){
> > > 
> > >             try {
> > > 
> > >             gnu.prolog.vm.Environment gve = new Environment();
> > >             gve.ensureLoaded(AtomTerm.get("D:/jagadish 
> > > java/usecase_editr/src/usecase_editr/rules_01.pl"));
> > >             Interpreter in = gve.createInterpreter();
> > >             gve.runInitialization(in);
> > > 
> > >           Term t1[]={AtomTerm.get("paul")};
> > >           Term t2[]={AtomTerm.get("John")};
> > >           Term t3[]={AtomTerm.get("brother")};
> > > 
> > > 
> > >             CompoundTerm ct1 =new CompoundTerm("brother",t1);
> > >          CompoundTerm goalTerm=new CompoundTerm("isSonOf",ct1,t2);
> > >           
> > >             int rc = in.runOnce(goalTerm);
> > > 
> > > 
> > >            if (rc == PrologCode.SUCCESS || rc == PrologCode.SUCCESS_LAST) 
> > > {
> > >                 System.out.println("Succesful execution ");
> > >             }
> > >            else {
> > >                 System.out.println("Failed execution ");
> > >            }
> > > 
> > > 
> > > 
> > >         } catch (PrologException ex) {
> > >             Logger.getLogger(RAE.class.getName()).log(Level.SEVERE, null, 
> > > ex);
> > >         }
> > > 
> > >     }
> > > 
> > > }
> > > 
> > > ====================================================================
> > > ==
> > > =======================
> > > 
> > > Regards,
> > > --Suman
> > > 
> > > Suman Roy, Ph.D.
> > > Infosys LABS,
> > > Infosys Technologies Ltd.,
> > > Bangalore, India.     
> > > Mob. +91 98860 23203
> > > 
> > > 
> > > 
> > > -----Original Message-----
> > > From: Daniel Thomas [mailto:address@hidden
> > > Sent: Thursday, April 12, 2012 5:55 PM
> > > To: Suman Roy
> > > Cc: address@hidden; Jagadish Koneti
> > > Subject: Re: [Info-gnuprologjava] Problem of Creating queries having 
> > > a term involving function symbols
> > > 
> > > Hello,
> > > 
> > > There shouldn't be any problem here, you construct brother(Paul) and then 
> > > use that when constructing isSonOf(brother(Paul), John). The relevant 
> > > documentation is:
> > > http://www.gnu.org/software/gnuprologjava/manual/Constructing-Terms.
> > > ht
> > > ml#Constructing-Terms
> > > and
> > > http://www.gnu.org/software/gnuprologjava/api/gnu/prolog/term/CompoundTerm.html#CompoundTerm(gnu.prolog.term.AtomTerm,
> > >  gnu.prolog.term.Term[]) (or one of the similar constructors).
> > > 
> > > If you are having problems it would be helpful to know what it is you are 
> > > trying to do. What is the code you have written that does not work?
> > > There should not be any problems as the API does support what you are 
> > > trying to do - just possibly not the way you are trying to do it.
> > > 
> > > I hope that helps,
> > > 
> > > Daniel
> > > 
> > > On Thu, 2012-04-12 at 16:59 +0530, Suman Roy wrote:
> > > > Hello,
> > > > 
> > > >  
> > > > 
> > > > We have created some rule base in Prolog for some industrial 
> > > > application. Now we want to create queries through Java APIs and 
> > > > subsequently fire them to Prolog interpreter on this rule base.
> > > > Specifically, we are using  “gnuprologjava-0.2.5 “ API .  However, 
> > > > we are having problem creating queries which has a term involving 
> > > > function symbol inside a query predicate by using this API. For 
> > > > example, consider the following query,
> > > > 
> > > > :- isSonOf(brother(Paul), John). 
> > > > 
> > > > We cannot create the term brother(Paul) using this API, where 
> > > > `brother’ is a function symbol in the vocabulary.
> > > > 
> > > > Can you please suggest us how to create such terms using the above 
> > > > API?
> > > > 
> > > >  
> > > > 
> > > > Regards,
> > > > 
> > > > --Suman
> > > > 
> > > > Suman Roy, Ph.D.
> > > > Infosys LABS,
> > > > 
> > > > Infosys Technologies Ltd.,
> > > > 
> > > > Bldg.-19, # 44 Electronics City, Hosur Road, Bangalore 560 100, India.
> > > > Tel. +91 80 2852 0261 x 50850
> > > >      +91 80 4116 3850 (D)
> > > >      +91 80 2351 2373 (R)
> > > >      +91 98860 23203 (M)
> > > > Fax. +91 80 2852 0362
> > > > E-mail address@hidden <mailto:address@hidden>
> > > >        address@hidden <mailto:address@hidden>
> > > > 
> > > > 
> > > > 
> > > >  
> > > > 
> > > > 
> > > > **************** CAUTION - Disclaimer ***************** This 
> > > > e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended 
> > > > solely for the use of the addressee(s). If you are not the 
> > > > intended recipient, please notify the sender by e-mail and delete the 
> > > > original message.
> > > > Further, you are not to copy, disclose, or distribute this e-mail 
> > > > or its contents to any other person and any such actions are unlawful.
> > > > This e-mail may contain viruses. Infosys has taken every 
> > > > reasonable precaution to minimize this risk, but is not liable for 
> > > > any damage you may sustain as a result of any virus in this 
> > > > e-mail. You should carry out your own virus checks before opening the 
> > > > e-mail or attachment.
> > > > Infosys reserves the right to monitor and review the content of 
> > > > all messages sent to or from this e-mail address. Messages sent to or 
> > > > from this e-mail address may be stored on the Infosys e-mail system.
> > > > ***INFOSYS******** End of Disclaimer ********INFOSYS***
> > > 
> > 
>