edu.sdsc.scigraph.services.jersey.writers.XgmmlWriter.java Source code

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Here is the source code for edu.sdsc.scigraph.services.jersey.writers.XgmmlWriter.java

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/**
 * Copyright (C) 2014 The SciGraph authors
 *
 * 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 edu.sdsc.scigraph.services.jersey.writers;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.Type;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.namespace.QName;

import jersey.repackaged.com.google.common.collect.Iterables;

import com.google.common.base.Optional;
import com.tinkerpop.blueprints.Direction;
import com.tinkerpop.blueprints.Edge;
import com.tinkerpop.blueprints.Element;
import com.tinkerpop.blueprints.Graph;
import com.tinkerpop.blueprints.Vertex;

import edu.sdsc.scigraph.frames.NodeProperties;
import edu.sdsc.scigraph.services.jersey.CustomMediaTypes;
import edu.sdsc.scigraph.services.xgmml.Att;
import edu.sdsc.scigraph.services.xgmml.ObjectFactory;
import edu.sdsc.scigraph.services.xgmml.SimpleEdge;
import edu.sdsc.scigraph.services.xgmml.SimpleGraph;
import edu.sdsc.scigraph.services.xgmml.SimpleNode;

@Produces(CustomMediaTypes.APPLICATION_XGMML)
@Provider
public class XgmmlWriter extends GraphWriter {

    private static final Logger logger = Logger.getLogger(XgmmlWriter.class.getName());

    private static final ObjectFactory factory = new ObjectFactory();
    private final JAXBContext context;

    public XgmmlWriter() throws JAXBException {
        context = JAXBContext.newInstance(SimpleGraph.class);
    }

    static Optional<String> getLabel(Vertex vertex) {
        Optional<String> label = Optional.absent();
        if (vertex.getPropertyKeys().contains(NodeProperties.LABEL)) {
            Object value = vertex.getProperty(NodeProperties.LABEL);
            if (value.getClass().isArray()) {
                label = Optional.of((String) Array.get(value, 0));
            } else if (value instanceof Iterable) {
                label = Optional.of((String) Iterables.getFirst((Iterable<?>) value, null));
            } else {
                label = Optional.of((String) value);
            }
        }
        return label;
    }

    List<Att> getAtts(Element elt) {
        List<Att> attList = new ArrayList<>();
        for (String key : elt.getPropertyKeys()) {
            Att att = factory.createAtt();
            att.setName(key);
            att.setValue(elt.getProperty(key).toString());
            attList.add(att);
        }
        return attList;
    }

    @Override
    public void writeTo(Graph data, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> headers, OutputStream out) throws IOException {
        SimpleGraph graph = factory.createSimpleGraph();
        graph.setDirected(BigInteger.ONE);
        for (Vertex vertex : data.getVertices()) {
            SimpleNode node = factory.createSimpleNode();
            node.setId(BigInteger.valueOf(Long.parseLong((String) vertex.getId())));
            Optional<String> label = getLabel(vertex);
            if (label.isPresent()) {
                node.setLabel(label.get());
            }
            node.getAtt().addAll(getAtts(vertex));
            graph.getNodeOrEdge().add(node);
        }
        for (Edge edge : data.getEdges()) {
            SimpleEdge e = factory.createSimpleEdge();
            Vertex subject = edge.getVertex(Direction.OUT);
            Vertex object = edge.getVertex(Direction.IN);
            e.setSource(BigInteger.valueOf(Long.parseLong((String) subject.getId())));
            e.setTarget(BigInteger.valueOf(Long.parseLong((String) object.getId())));
            e.setType(edge.getLabel());
            e.getAtt().addAll(getAtts(edge));
            graph.getNodeOrEdge().add(e);
        }
        try {
            Marshaller marshaller = context.createMarshaller();
            JAXBElement<SimpleGraph> root = new JAXBElement<SimpleGraph>(
                    new QName("http://www.cs.rpi.edu/XGMML", "graph"), SimpleGraph.class, graph);
            marshaller.marshal(root, out);
            out.flush();
        } catch (JAXBException e) {
            logger.log(Level.WARNING, e.getMessage(), e);
        }
    }

}