opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/impl/StructuredDataToXmlProvider.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.sal.rest.impl;
   9
  10 import java.io.IOException;
  11 import java.io.OutputStream;
  12 import java.lang.annotation.Annotation;
  13 import java.lang.reflect.Type;
  14
  15 import javax.ws.rs.Produces;
  16 import javax.ws.rs.WebApplicationException;
  17 import javax.ws.rs.core.MediaType;
  18 import javax.ws.rs.core.MultivaluedMap;
  19 import javax.ws.rs.core.Response;
  20 import javax.ws.rs.ext.MessageBodyWriter;
  21 import javax.ws.rs.ext.Provider;
  22 import javax.xml.transform.OutputKeys;
  23 import javax.xml.transform.Transformer;
  24 import javax.xml.transform.TransformerException;
  25 import javax.xml.transform.TransformerFactory;
  26 import javax.xml.transform.dom.DOMSource;
  27 import javax.xml.transform.stream.StreamResult;
  28
  29 import org.opendaylight.controller.sal.rest.api.Draft01;
  30 import org.opendaylight.controller.sal.rest.api.Draft02;
  31 import org.opendaylight.controller.sal.rest.api.RestconfService;
  32 import org.opendaylight.controller.sal.restconf.impl.ResponseException;
  33 import org.opendaylight.controller.sal.restconf.impl.StructuredData;
  34 import org.opendaylight.yangtools.yang.data.api.CompositeNode;
  35 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38 import org.w3c.dom.Document;
  39
  40 @Provider
  41 @Produces({ Draft01.MediaTypes.DATA + RestconfService.XML, Draft02.MediaTypes.DATA + RestconfService.XML,
  42         MediaType.APPLICATION_XML, MediaType.TEXT_XML })
  43 public enum StructuredDataToXmlProvider implements MessageBodyWriter<StructuredData> {
  44     INSTANCE;
  45
  46     private final static Logger logger = LoggerFactory.getLogger(StructuredDataToXmlProvider.class);
  47
  48     @Override
  49     public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
  50         return true;
  51     }
  52
  53     @Override
  54     public long getSize(StructuredData t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
  55         return -1;
  56     }
  57
  58     @Override
  59     public void writeTo(StructuredData t, Class<?> type, Type genericType, Annotation[] annotations,
  60             MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
  61             throws IOException, WebApplicationException {
  62         CompositeNode data = t.getData();
  63         if (data == null) {
  64             throw new ResponseException(Response.Status.NOT_FOUND, "No data exists.");
  65         }
  66
  67         XmlMapper xmlMapper = new XmlMapper();
  68         Document domTree = xmlMapper.write(data, (DataNodeContainer) t.getSchema());
  69         try {
  70             TransformerFactory tf = TransformerFactory.newInstance();
  71             Transformer transformer = tf.newTransformer();
  72             transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
  73             transformer.setOutputProperty(OutputKeys.METHOD, "xml");
  74             transformer.setOutputProperty(OutputKeys.INDENT, "yes");
  75             transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
  76             transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
  77             transformer.transform(new DOMSource(domTree), new StreamResult(entityStream));
  78         } catch (TransformerException e) {
  79             logger.error("Error during translation of Document to OutputStream", e);
  80             throw new ResponseException(Response.Status.INTERNAL_SERVER_ERROR, e.getMessage());
  81         }
  82     }
  83
  84 }