it.tidalwave.semantic.io.impl.GraphMarshallerImpl Maven / Gradle / Ivy
/***********************************************************************************************************************
*
* blueBill Mobile - open source birdwatching
* ==========================================
*
* Copyright (C) 2009, 2010 by Tidalwave s.a.s. (http://www.tidalwave.it)
* http://bluebill.tidalwave.it/mobile/
*
***********************************************************************************************************************
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
***********************************************************************************************************************
*
* $Id: GraphMarshallerImpl.java,v 012efc9c7b75 2010/07/11 12:34:22 fabrizio $
*
**********************************************************************************************************************/
package it.tidalwave.semantic.io.impl;
import javax.annotation.concurrent.NotThreadSafe;
import java.util.Collection;
import java.util.IdentityHashMap;
import it.tidalwave.netbeans.util.Locator;
import it.tidalwave.semantic.io.spi.StatementMarshallerFactory;
import it.tidalwave.semantic.io.spi.AsStatementMarshaller;
import java.util.ArrayList;
import java.util.List;
import org.openrdf.model.Statement;
import it.tidalwave.semantic.io.spi.StatementMarshaller;
import org.openrdf.model.impl.StatementImpl;
import it.tidalwave.mobile.media.Media;
import it.tidalwave.semantic.io.GraphMarshaller;
import it.tidalwave.util.As;
import it.tidalwave.util.AsException;
import it.tidalwave.util.Id;
import it.tidalwave.util.Identifiable;
import it.tidalwave.util.NotFoundException;
import java.util.Date;
import java.util.GregorianCalendar;
import javax.annotation.Nonnull;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import org.openrdf.model.Graph;
import org.openrdf.model.Resource;
import org.openrdf.model.Value;
import org.openrdf.model.ValueFactory;
import org.openrdf.model.impl.GraphImpl;
import org.openrdf.model.vocabulary.XMLSchema;
/***********************************************************************************************************************
*
* @author Fabrizio Giudici
* @version $Id: $
*
**********************************************************************************************************************/
@NotThreadSafe
public class GraphMarshallerImpl implements GraphMarshaller, StatementMarshaller.Context
{
private List pendingEntities = new ArrayList();
private IdentityHashMap idMapByObject = new IdentityHashMap();
private Graph graph = new GraphImpl();
private int idSequence;
private final ValueFactory valueFactory = graph.getValueFactory();
/*******************************************************************************************************************
*
*
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@Nonnull
public Graph marshal (final @Nonnull As entity)
{
visitEntity(entity);
for (final As as : pendingEntities)
{
findStatementMarshallerFor(as).marshal(as, this);
}
return graph;
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
@Nonnull
public Id idFor (final @Nonnull Object oo)
{
return idFor(((UriWithAs)oo).getAs());
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
@Nonnull
public Id idFor (final @Nonnull As as)
{
if (as instanceof Media)
{
try
{
return ((Media)as).get(Media.ID); // FIXME: refactor as as(Identifiable).getId()
}
catch (NotFoundException e)
{
throw new RuntimeException(e);
}
}
try
{
return as.as(Identifiable.class).getId();
}
catch (AsException e)
{
Id id = idMapByObject.get(as);
if (id == null)
{
id = new Id("_:x" + (idSequence++));
idMapByObject.put(as, id);
}
return id;
}
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
@Nonnull
private static StatementMarshaller findStatementMarshallerFor (final @Nonnull As object)
{
try
{
return Locator.find(StatementMarshallerFactory.class).findStatementMarshallerFor(object);
}
catch (NotFoundException ex)
{
return new AsStatementMarshaller();
}
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
private void visitEntity (final @Nonnull As entity)
{
enqueueEntity(entity);
final Graph graphSave = graph;
graph = new GraphImpl();
findStatementMarshallerFor(entity).marshal(entity, this);
final Collection statements = graph;
graphSave.addAll(graph);
graph = graphSave;
for (final Statement statement : statements)
{
final Object object = statement.getObject();
if (object instanceof UriWithAs)
{
final As as = ((UriWithAs)object).getAs();
if (!visited(as))
{
visitEntity(as);
}
}
final Resource subject = statement.getSubject();
if (subject instanceof UriWithAs)
{
final As as = ((UriWithAs)subject).getAs();
if (!visited(as))
{
visitEntity(as);
}
}
}
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
private boolean visited (final @Nonnull Object object)
{
// don't use pendingEntities.contains(object) because we don't want to call equals()
for (final Object o : pendingEntities)
{
if (o == object)
{
return true;
}
}
return false;
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
private void enqueueEntity (final @Nonnull As object)
{
if (!pendingEntities.contains(object))
{
pendingEntities.add(object);
}
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
@Nonnull
public void addStatement (final @Nonnull As subject,
final @Nonnull Id predicate,
final @Nonnull Object object)
{
// FIXME: use the factory
graph.add(new StatementImpl(objectToResource(subject),
Converter.idToUri(predicate),
objectToValue(object)));
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
@Nonnull
public Resource objectToResource (final @Nonnull Object object)
{
if (object instanceof Media) // FIXME: Media must be As Identifiable
{
try
{
return new UriImplWithAs(((Media)object).get(Media.ID).stringValue(), (As)object);
}
catch (NotFoundException e)
{
throw new RuntimeException(e);
}
}
if (object instanceof As)
{
try
{
return new UriImplWithAs(((As)object).as(Identifiable.class).getId().stringValue(), (As)object);
}
catch (AsException e)
{
return new UriImplWithAs(idFor((As)object).stringValue(), (As)object);
}
}
throw new RuntimeException("Cannot convert to resource: " + object);
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
@Nonnull
public Value objectToValue (final @Nonnull Object object)
{
if (object instanceof Media) // FIXME: Media must be As Identifiable
{
try
{
return new UriImplWithAs(((Media)object).get(Media.ID).stringValue(), (As)object);
}
catch (NotFoundException e)
{
throw new RuntimeException(e);
}
}
if (object instanceof As)
{
try
{
return new UriImplWithAs(((As)object).as(Identifiable.class).getId().stringValue(), (As)object);
}
catch (AsException e)
{
return new UriImplWithAs(idFor((As)object).stringValue(), (As)object);
}
}
if (object instanceof Id)
{
return valueFactory.createURI(((Id)object).stringValue());
}
if (object instanceof String)
{
return valueFactory.createLiteral((String)object);
// return valueFactory.createLiteral((String)object, XMLSchema.STRING);
}
if (object instanceof Date)
{
final GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime((Date)object);
try
{
return valueFactory. createLiteral(DatatypeFactory.newInstance().newXMLGregorianCalendar(calendar));
}
catch (DatatypeConfigurationException e)
{
throw new RuntimeException(e);
}
}
throw new RuntimeException("Cannot convert to value: " + object);
}
}
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