opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/impl/NormalizedNodeXmlBodyWriter.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 com.google.common.base.Throwables;
  11 import java.io.IOException;
  12 import java.io.OutputStream;
  13 import java.lang.annotation.Annotation;
  14 import java.lang.reflect.Type;
  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.stream.FactoryConfigurationError;
  23 import javax.xml.stream.XMLOutputFactory;
  24 import javax.xml.stream.XMLStreamException;
  25 import javax.xml.stream.XMLStreamWriter;
  26 import org.opendaylight.controller.sal.rest.api.Draft02;
  27 import org.opendaylight.controller.sal.rest.api.RestconfService;
  28 import org.opendaylight.controller.sal.restconf.impl.InstanceIdentifierContext;
  29 import org.opendaylight.controller.sal.restconf.impl.NormalizedNodeContext;
  30 import org.opendaylight.controller.sal.restconf.impl.RestconfDocumentedException;
  31 import org.opendaylight.yangtools.yang.common.QName;
  32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  33 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  34 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  35 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  36 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  37 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  38 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  39 import org.opendaylight.yangtools.yang.data.impl.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  40 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  41 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  42 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  43
  44 @Provider
  45 @Produces({ Draft02.MediaTypes.API + RestconfService.XML, Draft02.MediaTypes.DATA + RestconfService.XML,
  46         Draft02.MediaTypes.OPERATION + RestconfService.XML, MediaType.APPLICATION_XML, MediaType.TEXT_XML })
  47 public class NormalizedNodeXmlBodyWriter implements MessageBodyWriter<NormalizedNodeContext> {
  48
  49     private static final XMLOutputFactory XML_FACTORY;
  50
  51     static {
  52         XML_FACTORY = XMLOutputFactory.newFactory();
  53         XML_FACTORY.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
  54     }
  55
  56     @Override
  57     public boolean isWriteable(final Class<?> type, final Type genericType, final Annotation[] annotations,
  58             final MediaType mediaType) {
  59         return type.equals(NormalizedNodeContext.class);
  60     }
  61
  62     @Override
  63     public long getSize(final NormalizedNodeContext t, final Class<?> type, final Type genericType,
  64             final Annotation[] annotations, final MediaType mediaType) {
  65         return -1;
  66     }
  67
  68     @Override
  69     public void writeTo(final NormalizedNodeContext t, final Class<?> type, final Type genericType,
  70             final Annotation[] annotations, final MediaType mediaType,
  71             final MultivaluedMap<String, Object> httpHeaders, final OutputStream entityStream) throws IOException,
  72             WebApplicationException {
  73         InstanceIdentifierContext pathContext = t.getInstanceIdentifierContext();
  74         if (t.getData() == null) {
  75             throw new RestconfDocumentedException(Response.Status.NOT_FOUND);
  76         }
  77
  78         XMLStreamWriter xmlWriter;
  79         try {
  80             xmlWriter = XML_FACTORY.createXMLStreamWriter(entityStream);
  81         } catch (XMLStreamException e) {
  82             throw new IllegalStateException(e);
  83         } catch (FactoryConfigurationError e) {
  84             throw new IllegalStateException(e);
  85         }
  86         NormalizedNode<?, ?> data = t.getData();
  87         SchemaPath schemaPath = pathContext.getSchemaNode().getPath();
  88
  89         boolean isDataRoot = false;
  90         if (SchemaPath.ROOT.equals(schemaPath)) {
  91             isDataRoot = true;
  92         } else {
  93             schemaPath = schemaPath.getParent();
  94         }
  95
  96         NormalizedNodeStreamWriter jsonWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter,
  97                 pathContext.getSchemaContext(), schemaPath);
  98         NormalizedNodeWriter nnWriter = NormalizedNodeWriter.forStreamWriter(jsonWriter);
  99         if (isDataRoot) {
 100             writeRootElement(xmlWriter, nnWriter, (ContainerNode) data);
 101         } else {
 102             if (data instanceof MapEntryNode) {
 103                 // Restconf allows returning one list item. We need to wrap it
 104                 // in map node in order to serialize it properly
 105                 data = ImmutableNodes.mapNodeBuilder(data.getNodeType()).addChild((MapEntryNode) data).build();
 106             }
 107             nnWriter.write(data);
 108             nnWriter.flush();
 109         }
 110     }
 111
 112     private void writeRootElement(XMLStreamWriter xmlWriter, NormalizedNodeWriter nnWriter, ContainerNode data)
 113             throws IOException {
 114         try {
 115             QName name = SchemaContext.NAME;
 116             xmlWriter.writeStartElement(name.getNamespace().toString(), name.getLocalName());
 117             for (DataContainerChild<? extends PathArgument, ?> child : data.getValue()) {
 118                 nnWriter.write(child);
 119             }
 120             nnWriter.flush();
 121             xmlWriter.writeEndElement();
 122             xmlWriter.flush();
 123         } catch (XMLStreamException e) {
 124             Throwables.propagate(e);
 125         }
 126     }
 127 }