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.Draft02;
  30 import org.opendaylight.controller.sal.rest.api.RestconfService;
  31 import org.opendaylight.controller.sal.restconf.impl.RestconfDocumentedException;
  32 import org.opendaylight.controller.sal.restconf.impl.RestconfError.ErrorTag;
  33 import org.opendaylight.controller.sal.restconf.impl.RestconfError.ErrorType;
  34 import org.opendaylight.controller.sal.restconf.impl.StructuredData;
  35 import org.opendaylight.yangtools.yang.data.api.CompositeNode;
  36 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39 import org.w3c.dom.Document;
  40
  41 @Provider
  42 @Produces({ Draft02.MediaTypes.API + RestconfService.XML, Draft02.MediaTypes.DATA + RestconfService.XML,
  43         Draft02.MediaTypes.OPERATION + RestconfService.XML, MediaType.APPLICATION_XML, MediaType.TEXT_XML })
  44 public enum StructuredDataToXmlProvider implements MessageBodyWriter<StructuredData> {
  45     INSTANCE;
  46
  47     private final static Logger logger = LoggerFactory.getLogger(StructuredDataToXmlProvider.class);
  48
  49     @Override
  50     public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
  51         return type.equals( StructuredData.class );
  52     }
  53
  54     @Override
  55     public long getSize(StructuredData t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
  56         return -1;
  57     }
  58
  59     @Override
  60     public void writeTo(StructuredData t, Class<?> type, Type genericType, Annotation[] annotations,
  61             MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
  62             throws IOException, WebApplicationException {
  63         CompositeNode data = t.getData();
  64         if (data == null) {
  65             throw new RestconfDocumentedException(Response.Status.NOT_FOUND);
  66         }
  67
  68         XmlMapper xmlMapper = new XmlMapper();
  69         Document domTree = xmlMapper.write(data, (DataNodeContainer) t.getSchema());
  70         try {
  71             TransformerFactory tf = TransformerFactory.newInstance();
  72             Transformer transformer = tf.newTransformer();
  73             transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
  74             transformer.setOutputProperty(OutputKeys.METHOD, "xml");
  75             transformer.setOutputProperty(OutputKeys.INDENT, "yes");
  76             transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
  77             transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
  78             transformer.transform(new DOMSource(domTree), new StreamResult(entityStream));
  79         } catch (TransformerException e) {
  80             logger.error("Error during translation of Document to OutputStream", e);
  81             throw new RestconfDocumentedException( e.getMessage(), ErrorType.TRANSPORT,
  82                                                    ErrorTag.OPERATION_FAILED );
  83         }
  84     }
  85
  86 }