annis.provider.GraphMLProvider Maven / Gradle / Ivy
/*
* Copyright 2015 SFB 632.
*
* 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.
*/
package annis.provider;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.LinkedList;
import java.util.List;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import org.corpus_tools.salt.common.SCorpusGraph;
import org.corpus_tools.salt.common.SDocument;
import org.corpus_tools.salt.common.SaltProject;
import org.corpus_tools.salt.util.internal.persistence.GraphMLWriter;
/**
*
* @author Thomas Krause {@literal }
*/
@Provider
public class GraphMLProvider implements MessageBodyWriter
{
public static final MediaType APPLICATION_GRAPHML = new MediaType(
"application",
"graphml+xml");
@Override
public boolean isWriteable(
Class type, Type genericType, Annotation[] annotations,
MediaType mediaType)
{
return (APPLICATION_GRAPHML.isCompatible(mediaType))
&& SaltProject.class.isAssignableFrom(type);
}
@Override
public long getSize(SaltProject t,
Class type, Type genericType, Annotation[] annotations,
MediaType mediaType)
{
return -1;
}
@Override
public void writeTo(SaltProject t,
Class type, Type genericType, Annotation[] annotations,
MediaType mediaType, MultivaluedMap httpHeaders,
OutputStream entityStream) throws IOException, WebApplicationException
{
// collect document graphs from the salt project
List docs = new LinkedList<>();
List corpusGraphs = t.getCorpusGraphs();
if(corpusGraphs != null)
{
for(SCorpusGraph c : corpusGraphs)
{
if(c.getDocuments() != null)
{
docs.addAll(c.getDocuments());
}
}
}
GraphMLWriter.writeDocuments(entityStream, docs);
}
}