Source Code Cross Referenced for DescribeClass.java in  » RSS-RDF » Jena-2.5.5 » jena » examples » ontology » describeClass » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » jena.examples.ontology.describeClass 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*****************************************************************************
002:         * Source code information
003:         * -----------------------
004:         * Original author    Ian Dickinson, HP Labs Bristol
005:         * Author email       ian.dickinson@hp.com
006:         * Package            Jena 2
007:         * Web                http://sourceforge.net/projects/jena/
008:         * Created            25-Jul-2003
009:         * Filename           $RCSfile: DescribeClass.java,v $
010:         * Revision           $Revision: 1.1 $
011:         * Release status     $State: Exp $
012:         *
013:         * Last modified on   $Date: 2005/10/06 17:49:06 $
014:         *               by   $Author: andy_seaborne $
015:         *
016:         * (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
017:         * (see footer for full conditions)
018:         *****************************************************************************/package jena.examples.ontology.describeClass;
019:
020:        // Imports
021:        ///////////////
022:        import java.io.PrintStream;
023:        import java.util.*;
024:
025:        import com.hp.hpl.jena.ontology.*;
026:        import com.hp.hpl.jena.rdf.model.*;
027:        import com.hp.hpl.jena.shared.PrefixMapping;
028:
029:        /**
030:         * <p>
031:         * Simple example of describing the basic attributes of a OWL, DAML or RDFS class
032:         * using the ontology API.  This is not meant as a definitive solution to the problem,
033:         * but as an illustration of one approach to solving the problem. This example should
034:         * be adapted as necessary to provide a given application with the means to render
035:         * a class description in a readable form.
036:         * </p>
037:         *
038:         * @author Ian Dickinson, HP Labs
039:         *         (<a  href="mailto:Ian.Dickinson@hp.com" >email</a>)
040:         * @version CVS $Id: DescribeClass.java,v 1.1 2005/10/06 17:49:06 andy_seaborne Exp $
041:         */
042:        public class DescribeClass {
043:            // Constants
044:            //////////////////////////////////
045:
046:            // Static variables
047:            //////////////////////////////////
048:
049:            // Instance variables
050:            //////////////////////////////////
051:
052:            private Map m_anonIDs = new HashMap();
053:            private int m_anonCount = 0;
054:
055:            // Constructors
056:            //////////////////////////////////
057:
058:            // External signature methods
059:            //////////////////////////////////
060:
061:            /**
062:             * <p>Describe the given ontology class in texttual form. The description
063:             * produced has the following form (approximately):
064:             * <pre>
065:             * Class foo:Bar
066:             *    is a sub-class of foo:A, ex:B
067:             *    is a super-class of ex:C
068:             * </pre>
069:             * </p>
070:             *
071:             * @param out The print stream to write the description to
072:             * @param cls The ontology class to describe
073:             */
074:            public void describeClass(PrintStream out, OntClass cls) {
075:                renderClassDescription(out, cls);
076:                out.println();
077:
078:                // sub-classes
079:                for (Iterator i = cls.listSuperClasses(true); i.hasNext();) {
080:                    out.print("  is a sub-class of ");
081:                    renderClassDescription(out, (OntClass) i.next());
082:                    out.println();
083:                }
084:
085:                // super-classes
086:                for (Iterator i = cls.listSubClasses(true); i.hasNext();) {
087:                    out.print("  is a super-class of ");
088:                    renderClassDescription(out, (OntClass) i.next());
089:                    out.println();
090:                }
091:            }
092:
093:            /**
094:             * <p>Render a description of the given class to the given output stream.</p>
095:             * @param out A print stream to write to
096:             * @param c The class to render
097:             */
098:            public void renderClassDescription(PrintStream out, OntClass c) {
099:                if (c.isUnionClass()) {
100:                    renderBooleanClass(out, "union", c.asUnionClass());
101:                } else if (c.isIntersectionClass()) {
102:                    renderBooleanClass(out, "intersection", c
103:                            .asIntersectionClass());
104:                } else if (c.isComplementClass()) {
105:                    renderBooleanClass(out, "complement", c.asComplementClass());
106:                } else if (c.isRestriction()) {
107:                    renderRestriction(out, c.asRestriction());
108:                } else {
109:                    if (!c.isAnon()) {
110:                        out.print("Class ");
111:                        renderURI(out, prefixesFor(c), c.getURI());
112:                        out.print(' ');
113:                    } else {
114:                        renderAnonymous(out, c, "class");
115:                    }
116:                }
117:            }
118:
119:            // Internal implementation methods
120:            //////////////////////////////////
121:
122:            /**
123:             * <p>Handle the case of rendering a restriction.</p>
124:             * @param out The print stream to write to
125:             * @param r The restriction to render
126:             */
127:            protected void renderRestriction(PrintStream out, Restriction r) {
128:                if (!r.isAnon()) {
129:                    out.print("Restriction ");
130:                    renderURI(out, prefixesFor(r), r.getURI());
131:                } else {
132:                    renderAnonymous(out, r, "restriction");
133:                }
134:
135:                out.println();
136:
137:                renderRestrictionElem(out, "    on property", r.getOnProperty());
138:                out.println();
139:
140:                if (r.isAllValuesFromRestriction()) {
141:                    renderRestrictionElem(out, "    all values from", r
142:                            .asAllValuesFromRestriction().getAllValuesFrom());
143:                }
144:                if (r.isSomeValuesFromRestriction()) {
145:                    renderRestrictionElem(out, "    some values from", r
146:                            .asSomeValuesFromRestriction().getSomeValuesFrom());
147:                }
148:                if (r.isHasValueRestriction()) {
149:                    renderRestrictionElem(out, "    has value", r
150:                            .asHasValueRestriction().getHasValue());
151:                }
152:            }
153:
154:            protected void renderRestrictionElem(PrintStream out, String desc,
155:                    RDFNode value) {
156:                out.print(desc);
157:                out.print(" ");
158:                renderValue(out, value);
159:            }
160:
161:            protected void renderValue(PrintStream out, RDFNode value) {
162:                if (value.canAs(OntClass.class)) {
163:                    renderClassDescription(out, (OntClass) value
164:                            .as(OntClass.class));
165:                } else if (value instanceof  Resource) {
166:                    Resource r = (Resource) value;
167:                    if (r.isAnon()) {
168:                        renderAnonymous(out, r, "resource");
169:                    } else {
170:                        renderURI(out, r.getModel(), r.getURI());
171:                    }
172:                } else if (value instanceof  Literal) {
173:                    out.print(((Literal) value).getLexicalForm());
174:                } else {
175:                    out.print(value);
176:                }
177:            }
178:
179:            protected void renderURI(PrintStream out, PrefixMapping prefixes,
180:                    String uri) {
181:                out.print(prefixes.shortForm(uri));
182:            }
183:
184:            protected PrefixMapping prefixesFor(Resource n) {
185:                return n.getModel().getGraph().getPrefixMapping();
186:            }
187:
188:            protected void renderAnonymous(PrintStream out, Resource anon,
189:                    String name) {
190:                String anonID = (String) m_anonIDs.get(anon.getId());
191:                if (anonID == null) {
192:                    anonID = "a-" + m_anonCount++;
193:                    m_anonIDs.put(anon.getId(), anonID);
194:                }
195:
196:                out.print("Anonymous ");
197:                out.print(name);
198:                out.print(" with ID ");
199:                out.print(anonID);
200:            }
201:
202:            protected void renderBooleanClass(PrintStream out, String op,
203:                    BooleanClassDescription boolClass) {
204:                out.print(op);
205:                out.println(" of {");
206:
207:                for (Iterator i = boolClass.listOperands(); i.hasNext();) {
208:                    out.print("      ");
209:                    renderClassDescription(out, (OntClass) i.next());
210:                    out.println();
211:                }
212:                out.print("  } ");
213:            }
214:
215:            //==============================================================================
216:            // Inner class definitions
217:            //==============================================================================
218:
219:        }
220:
221:        /*
222:         (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
223:         All rights reserved.
224:
225:         Redistribution and use in source and binary forms, with or without
226:         modification, are permitted provided that the following conditions
227:         are met:
228:
229:         1. Redistributions of source code must retain the above copyright
230:         notice, this list of conditions and the following disclaimer.
231:
232:         2. Redistributions in binary form must reproduce the above copyright
233:         notice, this list of conditions and the following disclaimer in the
234:         documentation and/or other materials provided with the distribution.
235:
236:         3. The name of the author may not be used to endorse or promote products
237:         derived from this software without specific prior written permission.
238:
239:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
240:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
241:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
242:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
243:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
244:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
245:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
246:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
247:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
248:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
249:         */
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