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

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