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improved removeAll(g, s, p, o) implementation in RDFServiceBulkUpdateHandler NIHVIVO-3873

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brianjlowe 2012-07-05 15:37:53 +00:00
parent 809ff432b6
commit 37b237b813
1 changed files with 107 additions and 0 deletions
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107
webapp/src/edu/cornell/mannlib/vitro/webapp/dao/jena/RDFServiceGraphBulkUpdater.java
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@ -19,6 +19,7 @@ import com.hp.hpl.jena.graph.GraphUtil;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.graph.impl.SimpleBulkUpdateHandler;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.Statement;
@ -29,6 +30,7 @@ import com.hp.hpl.jena.util.iterator.ExtendedIterator;
import edu.cornell.mannlib.vitro.webapp.rdfservice.ChangeSet;
import edu.cornell.mannlib.vitro.webapp.rdfservice.RDFService;
import edu.cornell.mannlib.vitro.webapp.rdfservice.RDFServiceException;
import edu.cornell.mannlib.vitro.webapp.rdfservice.impl.RDFServiceUtils;
public class RDFServiceGraphBulkUpdater extends SimpleBulkUpdateHandler {
@ -163,6 +165,111 @@ public class RDFServiceGraphBulkUpdater extends SimpleBulkUpdateHandler {
}
public static void removeAll(Graph g, Node s, Node p, Node o)
{
if (!(g instanceof RDFServiceGraph)) {
removeAllTripleByTriple(g, s, p, o);
return;
}
RDFServiceGraph graph = (RDFServiceGraph) g;
String graphURI = graph.getGraphURI();
StringBuffer findPattern = new StringBuffer()
.append(sparqlNode(s, "?s"))
.append(" ")
.append(sparqlNode(p, "?p"))
.append(" ")
.append(sparqlNode(o, "?o"));
StringBuffer findQuery = new StringBuffer("CONSTRUCT { ")
.append(findPattern)
.append("} WHERE { \n");
if (graphURI != null) {
findQuery.append(" GRAPH <" + graphURI + "> { ");
}
findQuery.append(findPattern);
if (graphURI != null) {
findQuery.append(" } ");
}
findQuery.append("\n}");
String queryString = findQuery.toString();
try {
ChangeSet cs = graph.getRDFService().manufactureChangeSet();
cs.addRemoval(graph.getRDFService().sparqlConstructQuery(
queryString, RDFService.ModelSerializationFormat.N3),
RDFService.ModelSerializationFormat.N3, graphURI);
graph.getRDFService().changeSetUpdate(cs);
} catch (RDFServiceException e) {
throw new RuntimeException(e);
}
}
private static String sparqlNode(Node node, String varName) {
if (node == null || node.isVariable() || node.isBlank()) {
return varName;
} else if (node.isURI()) {
StringBuffer uriBuff = new StringBuffer();
return uriBuff.append("<").append(node.getURI()).append(">").toString();
} else if (node.isLiteral()) {
StringBuffer literalBuff = new StringBuffer();
literalBuff.append("\"");
pyString(literalBuff, node.getLiteralLexicalForm());
literalBuff.append("\"");
if (node.getLiteralDatatypeURI() != null) {
literalBuff.append("^^<").append(node.getLiteralDatatypeURI()).append(">");
} else if (node.getLiteralLanguage() != null && node.getLiteralLanguage() != "") {
literalBuff.append("@").append(node.getLiteralLanguage());
}
return literalBuff.toString();
} else {
return varName;
}
}
/*
*
* see http://www.python.org/doc/2.5.2/ref/strings.html
* or see jena's n3 grammar jena/src/com/hp/hpl/jena/n3/n3.g
*/
protected static void pyString(StringBuffer sbuff, String s)
{
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
// Escape escapes and quotes
if (c == '\\' || c == '"' )
{
sbuff.append('\\') ;
sbuff.append(c) ;
continue ;
}
// Whitespace
if (c == '\n'){ sbuff.append("\\n");continue; }
if (c == '\t'){ sbuff.append("\\t");continue; }
if (c == '\r'){ sbuff.append("\\r");continue; }
if (c == '\f'){ sbuff.append("\\f");continue; }
if (c == '\b'){ sbuff.append("\\b");continue; }
if( c == 7 ) { sbuff.append("\\a");continue; }
// Output as is (subject to UTF-8 encoding on output that is)
sbuff.append(c) ;
// // Unicode escapes
// // c < 32, c >= 127, not whitespace or other specials
// String hexstr = Integer.toHexString(c).toUpperCase();
// int pad = 4 - hexstr.length();
// sbuff.append("\\u");
// for (; pad > 0; pad--)
// sbuff.append("0");
// sbuff.append(hexstr);
}
}
public static void removeAllTripleByTriple(Graph g, Node s, Node p, Node o)
{
ExtendedIterator<Triple> it = g.find( s, p, o );
try {