it.tidalwave.semantic.io.impl.DefaultGraphDeserializer Maven / Gradle / Ivy
/***********************************************************************************************************************
*
* blueBill Core - open source birding
* Copyright (C) 2009-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
*
***********************************************************************************************************************
*
* 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.
*
***********************************************************************************************************************
*
* WWW: http://bluebill.tidalwave.it
* SCM: https://kenai.com/hg/bluebill~core-src
*
**********************************************************************************************************************/
package it.tidalwave.semantic.io.impl;
import it.tidalwave.semantic.io.GraphDeserializer;
import it.tidalwave.semantic.io.json.RdfJsonParser;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import javax.annotation.Nonnull;
import org.openrdf.model.Graph;
import org.openrdf.model.impl.GraphImpl;
import org.openrdf.rio.RDFHandlerException;
import org.openrdf.rio.RDFParseException;
import org.openrdf.rio.RDFParser;
import org.openrdf.rio.helpers.StatementCollector;
import org.openrdf.rio.n3.N3ParserFactory;
import org.openrdf.rio.rdfxml.RDFXMLParser;
/***********************************************************************************************************************
*
* @author Fabrizio Giudici
* @version $Id$
*
**********************************************************************************************************************/
public class DefaultGraphDeserializer implements GraphDeserializer
{
@Nonnull
private String contextUri = "";
/*******************************************************************************************************************
*
* {@inheritDoc}
*
******************************************************************************************************************/
@Nonnull
public Graph read (final @Nonnull InputStream is, final @Nonnull String mimeType)
throws IOException, RDFHandlerException, RDFParseException
{
return read(new InputStreamReader(is, "UTF-8"), mimeType);
}
/*******************************************************************************************************************
*
* {@inheritDoc}
*
******************************************************************************************************************/
@Nonnull
public Graph read (final @Nonnull Reader r, final @Nonnull String mimeType)
throws IOException, RDFHandlerException, RDFParseException
{
RDFParser rdfParser = null;
// We're not using yet the registry since we don't know whether it works with Android
if (MIME_RDF_JSON.equals(mimeType))
{
rdfParser = new RdfJsonParser();
}
else if (MIME_RDF_XML.equals(mimeType))
{
rdfParser = new RDFXMLParser();
}
else if (MIME_N3.equals(mimeType))
{
rdfParser = new N3ParserFactory().getParser();
}
else
{
throw new RDFHandlerException("No parser for MIME type: " + mimeType);
}
final StatementCollector statementCollector = new StatementCollector();
rdfParser.setRDFHandler(statementCollector);
rdfParser.parse(r, contextUri);
return new GraphImpl(statementCollector.getStatements());
}
/*******************************************************************************************************************
*
* {@inheritDoc}
*
******************************************************************************************************************/
public void setContextUri (final @Nonnull String contextUri)
{
this.contextUri = contextUri;
}
}