NodeWriter.java

/*
 *    Constellation - An open source and standard compliant SDI
 *    http://www.constellation-sdi.org
 *
 * Copyright 2014 Geomatys.
 *
 * 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 org.constellation.metadata.ws.rs.provider;

import org.w3c.dom.Node;

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 javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

/**
 *
 * @author Guilhem Legal (Geomatys)
 */
@Provider
public class NodeWriter implements MessageBodyWriter<Node> {

    @Override
    public boolean isWriteable(Class type, Type type1, Annotation[] antns, MediaType mt) {
        return Node.class.isAssignableFrom(type);
    }

    @Override
    public long getSize(Node t, Class type, Type type1, Annotation[] antns, MediaType mt) {
        return -1;
    }

    @Override
    public void writeTo(Node t, Class type, Type type1, Annotation[] antns, MediaType mt, MultivaluedMap mm, OutputStream out) throws IOException, WebApplicationException {
        try {
            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer transformer = tf.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.transform(new DOMSource(t), new StreamResult(out));
        } catch (TransformerException ex) {
            throw new IOException(ex);
        }
    }

}