Source Code Cross Referenced for ExProg1.java in  » RSS-RDF » Jena-2.5.5 » arq » examples » 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 » arq.examples 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * (c) Copyright 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
003:         * All rights reserved.
004:         * [See end of file]
005:         */
006:
007:        package arq.examples;
008:
009:        // The ARQ application API.
010:        import com.hp.hpl.jena.graph.Triple;
011:        import com.hp.hpl.jena.query.*;
012:        import com.hp.hpl.jena.rdf.model.*;
013:        import com.hp.hpl.jena.sparql.core.Var;
014:        import com.hp.hpl.jena.sparql.syntax.ElementGroup;
015:        import com.hp.hpl.jena.sparql.util.IndentedWriter;
016:        import com.hp.hpl.jena.vocabulary.DC;
017:
018:        /** Example : Build a query synatx programmatically.
019:         *  Note: it may be better to build and execute an algebra expression.  See other examples.
020:         * 
021:         * @author Andy Seaborne
022:         */
023:
024:        public class ExProg1 {
025:            static public final String NL = System
026:                    .getProperty("line.separator");
027:
028:            public static void main(String[] args) {
029:                Model model = createModel();
030:
031:                Query query = QueryFactory.make();
032:
033:                query.setQueryType(Query.QueryTypeSelect);
034:
035:                // Build pattern
036:
037:                ElementGroup elg = new ElementGroup();
038:
039:                Var varTitle = Var.alloc("title");
040:                Var varX = Var.alloc("x");
041:
042:                Triple t1 = new Triple(varX, DC.title.asNode(), varTitle);
043:                elg.addTriplePattern(t1);
044:
045:                // Don't use bNodes for anon variables.  The conversion is done in parsing.
046:                // BNodes here are assumed to be values from the target graph.
047:                Triple t2 = new Triple(varX, DC.description.asNode(), Var
048:                        .alloc("desc"));
049:                elg.addTriplePattern(t2);
050:
051:                // Attach the group to query.  
052:                query.setQueryPattern(elg);
053:
054:                // Choose what we want - SELECT *
055:                //query.setQueryResultStar(true) ;
056:                query.addResultVar(varTitle);
057:
058:                // Print query with line numbers
059:                // Prefix mapping just helps serialization
060:                query.getPrefixMapping().setNsPrefix("dc", DC.getURI());
061:                query.serialize(new IndentedWriter(System.out, true));
062:                System.out.println();
063:
064:                QueryExecution qexec = QueryExecutionFactory.create(query,
065:                        model);
066:
067:                try {
068:                    // Assumption: it's a SELECT query.
069:                    ResultSet rs = qexec.execSelect();
070:
071:                    // The order of results is undefined.
072:                    System.out.println("Titles: ");
073:                    for (; rs.hasNext();) {
074:                        QuerySolution rb = rs.nextSolution();
075:
076:                        // Get title - variable names do not include the '?' (or '$')
077:                        RDFNode x = rb.get("title");
078:
079:                        // Check the type of the result value
080:                        if (x instanceof  Literal) {
081:                            Literal titleStr = (Literal) x;
082:                            System.out.println("    " + titleStr);
083:                        } else
084:                            System.out.println("Strange - not a literal: " + x);
085:
086:                    }
087:                } finally {
088:                    // QueryExecution objects should be closed to free any system resources 
089:                    qexec.close();
090:                }
091:            }
092:
093:            public static Model createModel() {
094:                Model model = ModelFactory.createDefaultModel();
095:
096:                Resource r1 = model.createResource("http://example.org/book#1");
097:                Resource r2 = model.createResource("http://example.org/book#2");
098:                Resource r3 = model.createResource("http://example.org/book#3");
099:
100:                r1.addProperty(DC.title, "SPARQL - the book").addProperty(
101:                        DC.description, "A book about SPARQL");
102:
103:                r2.addProperty(DC.title, "Advanced techniques for SPARQL");
104:
105:                r3.addProperty(DC.title, "Jena - an RDF framework for Java")
106:                        .addProperty(DC.description, "A book about Jena");
107:
108:                return model;
109:            }
110:        }
111:
112:        /*
113:         * (c) Copyright 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
114:         * All rights reserved.
115:         *
116:         * Redistribution and use in source and binary forms, with or without
117:         * modification, are permitted provided that the following conditions
118:         * are met:
119:         * 1. Redistributions of source code must retain the above copyright
120:         *    notice, this list of conditions and the following disclaimer.
121:         * 2. Redistributions in binary form must reproduce the above copyright
122:         *    notice, this list of conditions and the following disclaimer in the
123:         *    documentation and/or other materials provided with the distribution.
124:         * 3. The name of the author may not be used to endorse or promote products
125:         *    derived from this software without specific prior written permission.
126:         *
127:         * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
128:         * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
129:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
130:         * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
131:         * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
132:         * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
133:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
134:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
135:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
136:         * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
137:         */
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