| DescribeClass.java |
/*****************************************************************************
* Source code information
* -----------------------
* Original author Ian Dickinson, HP Labs Bristol
* Author email [email protected]
* Package Jena 2
* Web http://sourceforge.net/projects/jena/
* Created 25-Jul-2003
* Filename $RCSfile: DescribeClass.java.html,v $
* Revision $Revision: 1.3 $
* Release status $State: Exp $
*
* Last modified on $Date: 2007/01/17 10:39:43 $
* by $Author: andy_seaborne $
*
* (c) Copyright 2002, 2003, 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
* (see footer for full conditions)
*****************************************************************************/
// Package
///////////////
package jena.examples.ontology.describeClass;
// Imports
///////////////
import java.io.PrintStream;
import java.util.*;
import com.hp.hpl.jena.ontology.*;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.shared.PrefixMapping;
/**
* <p>
* Simple example of describing the basic attributes of a OWL, DAML or RDFS class
* using the ontology API. This is not meant as a definitive solution to the problem,
* but as an illustration of one approach to solving the problem. This example should
* be adapted as necessary to provide a given application with the means to render
* a class description in a readable form.
* </p>
*
* @author Ian Dickinson, HP Labs
* (<a href="mailto:[email protected]" >email</a>)
* @version CVS $Id: DescribeClass.java.html,v 1.3 2007/01/17 10:39:43 andy_seaborne Exp $
*/
public class DescribeClass {
// Constants
//////////////////////////////////
// Static variables
//////////////////////////////////
// Instance variables
//////////////////////////////////
private Map m_anonIDs = new HashMap();
private int m_anonCount = 0;
// Constructors
//////////////////////////////////
// External signature methods
//////////////////////////////////
/**
* <p>Describe the given ontology class in texttual form. The description
* produced has the following form (approximately):
* <pre>
* Class foo:Bar
* is a sub-class of foo:A, ex:B
* is a super-class of ex:C
* </pre>
* </p>
*
* @param out The print stream to write the description to
* @param cls The ontology class to describe
*/
public void describeClass( PrintStream out, OntClass cls ) {
renderClassDescription( out, cls );
out.println();
// sub-classes
for (Iterator i = cls.listSuperClasses( true ); i.hasNext(); ) {
out.print( " is a sub-class of " );
renderClassDescription( out, (OntClass) i.next() );
out.println();
}
// super-classes
for (Iterator i = cls.listSubClasses( true ); i.hasNext(); ) {
out.print( " is a super-class of " );
renderClassDescription( out, (OntClass) i.next() );
out.println();
}
}
/**
* <p>Render a description of the given class to the given output stream.</p>
* @param out A print stream to write to
* @param c The class to render
*/
public void renderClassDescription( PrintStream out, OntClass c ) {
if (c.isUnionClass()) {
renderBooleanClass( out, "union", c.asUnionClass() );
}
else if (c.isIntersectionClass()) {
renderBooleanClass( out, "intersection", c.asIntersectionClass() );
}
else if (c.isComplementClass()) {
renderBooleanClass( out, "complement", c.asComplementClass() );
}
else if (c.isRestriction()) {
renderRestriction( out, c.asRestriction() );
}
else {
if (!c.isAnon()) {
out.print( "Class " );
renderURI( out, prefixesFor( c ), c.getURI() );
out.print( ' ' );
}
else {
renderAnonymous( out, c, "class" );
}
}
}
// Internal implementation methods
//////////////////////////////////
/**
* <p>Handle the case of rendering a restriction.</p>
* @param out The print stream to write to
* @param r The restriction to render
*/
protected void renderRestriction( PrintStream out, Restriction r ) {
if (!r.isAnon()) {
out.print( "Restriction " );
renderURI( out, prefixesFor( r ), r.getURI() );
}
else {
renderAnonymous( out, r, "restriction" );
}
out.println();
renderRestrictionElem( out, " on property", r.getOnProperty() );
out.println();
if (r.isAllValuesFromRestriction()) {
renderRestrictionElem( out, " all values from", r.asAllValuesFromRestriction().getAllValuesFrom() );
}
if (r.isSomeValuesFromRestriction()) {
renderRestrictionElem( out, " some values from", r.asSomeValuesFromRestriction().getSomeValuesFrom() );
}
if (r.isHasValueRestriction()) {
renderRestrictionElem( out, " has value", r.asHasValueRestriction().getHasValue() );
}
}
protected void renderRestrictionElem( PrintStream out, String desc, RDFNode value ) {
out.print( desc );
out.print( " " );
renderValue( out, value );
}
protected void renderValue( PrintStream out, RDFNode value ) {
if (value.canAs( OntClass.class )) {
renderClassDescription( out, (OntClass) value.as( OntClass.class ) );
}
else if (value instanceof Resource) {
Resource r = (Resource) value;
if (r.isAnon()) {
renderAnonymous( out, r, "resource" );
}
else {
renderURI( out, r.getModel(), r.getURI() );
}
}
else if (value instanceof Literal) {
out.print( ((Literal) value).getLexicalForm() );
}
else {
out.print( value );
}
}
protected void renderURI( PrintStream out, PrefixMapping prefixes, String uri ) {
out.print( prefixes.shortForm( uri ) );
}
protected PrefixMapping prefixesFor( Resource n ) {
return n.getModel().getGraph().getPrefixMapping();
}
protected void renderAnonymous( PrintStream out, Resource anon, String name ) {
String anonID = (String) m_anonIDs.get( anon.getId() );
if (anonID == null) {
anonID = "a-" + m_anonCount++;
m_anonIDs.put( anon.getId(), anonID );
}
out.print( "Anonymous ");
out.print( name );
out.print( " with ID " );
out.print( anonID );
}
protected void renderBooleanClass( PrintStream out, String op, BooleanClassDescription boolClass ) {
out.print( op );
out.println( " of {" );
for (Iterator i = boolClass.listOperands(); i.hasNext(); ) {
out.print( " " );
renderClassDescription( out, (OntClass) i.next() );
out.println();
}
out.print( " } " );
}
//==============================================================================
// Inner class definitions
//==============================================================================
}
/*
(c) Copyright 2002, 2003, 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
All rights reserved.
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modification, are permitted provided that the following conditions
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documentation and/or other materials provided with the distribution.
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derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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*/