BuiltinAtomImpl.java revision 38
/*
* Created on Dec 28, 2004
*/
package impl.swrl;
import java.util.HashSet;
import java.util.Set;
import org.mindswap.exceptions.NotImplementedException;
import org.mindswap.owl.OWLIndividual;
import org.mindswap.owl.OWLValue;
import org.mindswap.owl.list.RDFList;
import org.mindswap.owl.vocabulary.RDF;
import org.mindswap.owl.vocabulary.SWRL;
import org.mindswap.owl.vocabulary.SWRLB;
import org.mindswap.query.ValueMap;
import org.mindswap.swrl.BuiltinAtom;
import org.mindswap.swrl.SWRLDataObject;
import org.mindswap.swrl.SWRLObject;
/**
* @author Evren Sirin
*
*/
public class BuiltinAtomImpl extends AtomImpl implements BuiltinAtom {
private final static Set THREE_ARGS = new HashSet();
static {
THREE_ARGS.add( SWRLB.add );
THREE_ARGS.add( SWRLB.subtract );
THREE_ARGS.add( SWRLB.multiply );
THREE_ARGS.add( SWRLB.divide );
}
public BuiltinAtomImpl(OWLIndividual ind) {
super(ind);
}
public OWLIndividual getBuiltin() {
return getProperty(SWRL.builtin);
}
public void setBuiltin(OWLIndividual builtin) {
setProperty(SWRL.builtin, builtin);
}
public int getArgumentCount() {
if( THREE_ARGS.contains( getBuiltin() ) )
return 3;
return 2;
}
private RDFList getArguments() {
OWLIndividual args = getProperty(SWRL.arguments);
return (args == null) ? null : (RDFList) args.castTo( RDFList.class );
}
public SWRLObject getArgument( int index ) {
RDFList args = getArguments();
if( args == null ) return null;
OWLValue arg = args.getValue( index );
if( arg == null ) return null;
return (SWRLDataObject) arg.castTo( SWRLDataObject.class );
}
public void addArgument( SWRLObject arg ) {
if(!(arg instanceof SWRLDataObject))
throw new IllegalArgumentException("BuiltinAtom argument should be a SWRLDataObject");
RDFList args = getArguments();
if( args == null ) {
RDFList nil = getOntology().createList( RDF.ListVocabulary );
args = nil.insert( arg );
setProperty(SWRL.arguments, args);
}
else
args.add( arg );
}
public void setArgument(int index, SWRLObject arg) {
if(!(arg instanceof SWRLDataObject))
throw new IllegalArgumentException("BuiltinAtom argument should be a SWRLDataObject");
RDFList args = getArguments();
if( args == null ) {
if( index == 0 ) {
RDFList nil = getOntology().createList( RDF.ListVocabulary );
args = nil.insert( arg );
setProperty(SWRL.arguments, args);
}
else
throw new IndexOutOfBoundsException();
}
else {
args.set( index, arg );
}
}
public String toString() {
OWLIndividual builtin = getBuiltin();
if(builtin == null)
return "Missing_class_predicate";
StringBuffer str = new StringBuffer();
if( builtin.equals( SWRLB.equal ) ) {
str.append( "(" );
str.append( getArgument(0) );
str.append( " = " );
str.append( getArgument(1) );
str.append( ")" );
}
else if( builtin.equals( SWRLB.lessThan ) ) {
str.append( "(" );
str.append( getArgument(0) );
str.append( " < " );
str.append( getArgument(1) );
str.append( ")" );
}
else if( builtin.equals( SWRLB.greaterThan ) ) {
str.append( "(" );
str.append( getArgument(0) );
str.append( " > " );
str.append( getArgument(1) );
str.append( ")" );
}
else if( builtin.equals( SWRLB.add ) ) {
str.append( "(" );
str.append( getArgument(0) );
str.append( " = " );
str.append( getArgument(1) );
str.append( " + " );
str.append( getArgument(2) );
str.append( ")" );
}
else if( builtin.equals( SWRLB.subtract ) ) {
str.append( "(" );
str.append( getArgument(0) );
str.append( " = " );
str.append( getArgument(1) );
str.append( " - " );
str.append( getArgument(2) );
str.append( ")" );
}
else {
str.append( builtin.getLocalName() ).append( "(" );
for(int i = 0; i < getArgumentCount(); i++) {
SWRLObject arg = getArgument( i );
if( i > 0 )
str.append( ", " );
str.append( arg );
}
str.append(")");
}
return str.toString();
}
public void evaluate(ValueMap values) {
OWLIndividual builtin = getBuiltin();
if (! (builtin.equals(SWRLB.add) || builtin.equals(SWRLB.subtract) ||
builtin.equals(SWRLB.multiply) || builtin.equals(SWRLB.divide)))
return;
throw new NotImplementedException("Builtin SWRL atoms cannot be evaluated");
}
}