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