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incremental development

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This commit is contained in:
stellamit 2012-05-22 21:08:21 +00:00
parent 9e210249b9
commit e21bd9e170
4 changed files with 74 additions and 67 deletions
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10
webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/ChangeListener.java
View file

@ -14,20 +14,18 @@ public interface ChangeListener {
/**
* Override this to listen to all statements added to the RDF store.
*
* @param String serializedTriple - the added statement
* @param RDFService.ModelSerializationFormat format - RDF format of serializedTriple
* @param String serializedTriple - the added statement in n3 format
* @param String graphURI - the graph to which the statement was added
*/
public void addedStatement(String serializedTriple, RDFService.ModelSerializationFormat format, String graphURI);
public void addedStatement(String serializedTriple, String graphURI);
/**
* Override this to listen to all statements removed from the RDF store.
*
* @param String serializedTriple - the removed statement
* @param RDFService.ModelSerializationFormat format - RDF format of serializedTriple
* @param String serializedTriple - the removed statement in n3 format
* @param String graphURI - the graph from which the statement was removed
*/
public void removedStatement(String serializedTriple, RDFService.ModelSerializationFormat format, String graphURI);
public void removedStatement(String serializedTriple, String graphURI);
/**
* Override this to listen to events pertaining to the given graphURI.

8
webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/RDFService.java
View file

@ -3,7 +3,6 @@
package edu.cornell.mannlib.vitro.webapp.rdfservice;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
/*
@ -125,13 +124,6 @@ public interface RDFService {
*/
public String getDefaultWriteGraphURI() throws RDFServiceException;
/**
* Get the URI of the default read graph
*
* @return String URI of default read graph
*/
public String getDefaultReadGraphURI() throws RDFServiceException;
/**
* Register a listener to listen to changes in any graph in
* the RDF store.

115
webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/RDFServiceImpl.java
View file

@ -5,12 +5,13 @@ package edu.cornell.mannlib.vitro.webapp.rdfservice.impl;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.HashSet;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openrdf.model.Resource;
import org.openrdf.query.MalformedQueryException;
import org.openrdf.query.QueryLanguage;
import org.openrdf.query.Update;
@ -18,6 +19,7 @@ import org.openrdf.query.UpdateExecutionException;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.repository.RepositoryException;
import org.openrdf.repository.RepositoryResult;
import org.openrdf.repository.http.HTTPRepository;
import com.hp.hpl.jena.graph.Node;
@ -49,17 +51,19 @@ public class RDFServiceImpl implements RDFService {
private static final Log log = LogFactory.getLog(RDFServiceImpl.class);
private String endpointURI;
private String defaultWriteGraphURI;
private Repository repository;
private HashSet<ChangeListener> registeredListeners;
private ArrayList<ChangeListener> registeredListeners;
/**
* Returns an RDFService for a remote repository
* @param endpointURI
*/
public RDFServiceImpl(String endpointURI) {
public RDFServiceImpl(String endpointURI, String defaultWriteGraphURI) {
this.endpointURI = endpointURI;
this.defaultWriteGraphURI = defaultWriteGraphURI;
this.repository = new HTTPRepository(endpointURI);
this.registeredListeners = new HashSet<ChangeListener>();
this.registeredListeners = new ArrayList<ChangeListener>();
}
/**
@ -110,7 +114,7 @@ public class RDFServiceImpl implements RDFService {
public void newIndividual(String individualURI,
String individualTypeURI) throws RDFServiceException {
newIndividual(individualURI, individualTypeURI, null);
newIndividual(individualURI, individualTypeURI, defaultWriteGraphURI);
}
/**
@ -277,11 +281,30 @@ public class RDFServiceImpl implements RDFService {
*
* @return List<String> - list of all the graph URIs in the RDF store
*/
//TODO - need to verify that the sesame getContextIDs method is implemented
// in such a way that it works with all triple stores that support the
// graph update API
@Override
public List<String> getGraphURIs() throws RDFServiceException {
List<String> list = null;
return list;
List<String> graphNodeList = new ArrayList<String>();
try {
RepositoryConnection conn = getConnection();
try {
RepositoryResult<Resource> conResult = conn.getContextIDs();
while (conResult.hasNext()) {
Resource res = conResult.next();
graphNodeList.add(res.stringValue());
}
} finally {
conn.close();
}
} catch (RepositoryException re) {
throw new RuntimeException(re);
}
return graphNodeList;
}
/**
@ -300,21 +323,7 @@ public class RDFServiceImpl implements RDFService {
*/
@Override
public String getDefaultWriteGraphURI() throws RDFServiceException {
String graphURI = null;
return graphURI;
}
/**
* Get the URI of the default read graph
*
* @return String URI of default read graph
*/
@Override
public String getDefaultReadGraphURI() throws RDFServiceException {
String graphURI = null;
return graphURI;
return defaultWriteGraphURI;
}
/**
@ -324,7 +333,10 @@ public class RDFServiceImpl implements RDFService {
*/
@Override
public synchronized void registerListener(ChangeListener changeListener) throws RDFServiceException {
registeredListeners.add(changeListener);
if (!registeredListeners.contains(changeListener)) {
registeredListeners.add(changeListener);
}
}
/**
@ -384,51 +396,56 @@ public class RDFServiceImpl implements RDFService {
protected void addTriple(Triple t, String graphURI) {
String updateString = "INSERT DATA { " + ((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "" )
+ sparqlNodeUpdate(t.getSubject(), "") + " "
+ sparqlNodeUpdate(t.getPredicate(), "") + " "
+ sparqlNodeUpdate(t.getObject(), "") + " } "
+ ((graphURI != null) ? " } " : "");
StringBuffer updateString = new StringBuffer();
updateString.append("INSERT DATA { ");
updateString.append((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "" );
updateString.append(sparqlNodeUpdate(t.getSubject(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getPredicate(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getObject(), ""));
updateString.append(" }");
updateString.append((graphURI != null) ? " } " : "");
executeUpdate(updateString);
executeUpdate(updateString.toString());
notifyListeners(t, ModelChange.Operation.ADD, graphURI);
}
protected void removeTriple(Triple t, String graphURI) {
String updateString = "DELETE DATA { " + ((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "" )
+ sparqlNodeUpdate(t.getSubject(), "") + " "
+ sparqlNodeUpdate(t.getPredicate(), "") + " "
+ sparqlNodeUpdate(t.getObject(), "") + " } "
+ ((graphURI != null) ? " } " : "");
StringBuffer updateString = new StringBuffer();
updateString.append("DELETE DATA { ");
updateString.append((graphURI != null) ? "GRAPH <" + graphURI + "> { " : "" );
updateString.append(sparqlNodeUpdate(t.getSubject(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getPredicate(), ""));
updateString.append(" ");
updateString.append(sparqlNodeUpdate(t.getObject(), ""));
updateString.append(" }");
updateString.append((graphURI != null) ? " } " : "");
executeUpdate(updateString);
executeUpdate(updateString.toString());
notifyListeners(t, ModelChange.Operation.REMOVE, graphURI);
}
protected synchronized void notifyListeners(Triple triple, ModelChange.Operation operation, String graphURI) {
if (!(triple.getSubject().isURI() && triple.getPredicate().isURI() && triple.getObject().isURI())) {
return;
}
Model model = ModelFactory.createDefaultModel();
Statement statement = model.createStatement(model.createResource(triple.getSubject().getURI()),
model.createProperty(triple.getPredicate().getURI()),
model.createResource(triple.getObject().getURI()));
model.add(statement);
ByteArrayOutputStream serializedModel = new ByteArrayOutputStream();
model.write(serializedModel,getSerializationFormatString(RDFService.ModelSerializationFormat.N3));
String serializedTriple = serializedModel.toString();
StringBuffer serializedTriple = new StringBuffer();
serializedTriple.append(sparqlNodeUpdate(triple.getSubject(), ""));
serializedTriple.append(" ");
serializedTriple.append(sparqlNodeUpdate(triple.getPredicate(), ""));
serializedTriple.append(" ");
serializedTriple.append(sparqlNodeUpdate(triple.getObject(), ""));
serializedTriple.append(" .");
Iterator<ChangeListener> iter = registeredListeners.iterator();
while (iter.hasNext()) {
ChangeListener listener = iter.next();
if (operation == ModelChange.Operation.ADD) {
listener.addedStatement(serializedTriple, RDFService.ModelSerializationFormat.N3, graphURI);
listener.addedStatement(serializedTriple.toString(), graphURI);
} else {
listener.addedStatement(serializedTriple, RDFService.ModelSerializationFormat.N3, graphURI);
listener.removedStatement(serializedTriple.toString(), graphURI);
}
}
}