Java Code Examples for com.hp.hpl.jena.graph.Node#equals()

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Example 1
Source File: NeoGraph.java    From neo4jena with Apache License 2.0 4 votes vote down vote up 
/**
 * Find the given triple(s) from the graph. 
 */
@Override
public ExtendedIterator<Triple> find(Node subject, Node predicate, Node object) {
	//System.out.println("NeoGraph#find");
	try(Transaction tx = graphdb.beginTx()) {
		StringBuffer query = new StringBuffer("MATCH triple=");
		
		query.append("(subject");
		if(subject.equals(Node.ANY)) {
			query.append(":"+ LABEL_URI);
			//System.out.println("NeoGraph#find#Any:"+subject);
		} else if(subject.isURI()){
			query.append(":"+LABEL_URI+" {uri:'");
			query.append(subject.getURI());
			query.append("'}");
			//System.out.println("NeoGraph#find#URI:"+subject+subject.getURI());
		} else {
			query.append(":" + LABEL_BNODE);
			//System.out.println("NeoGraph#find#"+subject);
		}
		query.append(")-[predicate]->(object");
		
		//query.append("]->(object");
		if(object.equals(Node.ANY)) {
			//query.append(" ");
		} else if(object.isURI()){
			query.append(":"+LABEL_URI+" {uri:'");
			query.append(object.getURI());
			query.append("'}");
		} else {
			query.append(":"+LABEL_LITERAL+" {value:'");
			query.append(object.getLiteralValue());
			query.append("'}");
		}
		query.append(")");
		
		//System.out.println("Predicate in query: " +getPrefixMapping().shortForm(predicate.getURI()));
		if(predicate.isURI()) {
			query.append("WHERE type(predicate)='");
			query.append(getPrefixMapping().shortForm(predicate.getURI()));
			query.append("'");
		}
		
		query.append("\nRETURN subject, type(predicate), object");
		//System.out.println(query.toString());
		ExecutionEngine engine = new ExecutionEngine(graphdb);
		ExecutionResult results = engine.execute(query.toString());
		//System.out.println(results.dumpToString());
		//System.out.println("NeoGraph#find#"+predicate);
		//System.out.println("NeoGraph#find#"+object);
		//System.out.println("NeoGraph#find#DONE");
		return new ExecutionResultIterator(results, graphdb);
	}
}