restconf/sal-rest-connector/src/main/java/org/opendaylight/netconf/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.netconf.sal.rest.impl;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Throwables;
  12 import java.io.IOException;
  13 import java.io.OutputStream;
  14 import java.lang.annotation.Annotation;
  15 import java.lang.reflect.Type;
  16 import javax.ws.rs.Produces;
  17 import javax.ws.rs.WebApplicationException;
  18 import javax.ws.rs.core.MediaType;
  19 import javax.ws.rs.core.MultivaluedMap;
  20 import javax.ws.rs.ext.MessageBodyWriter;
  21 import javax.ws.rs.ext.Provider;
  22 import javax.xml.XMLConstants;
  23 import javax.xml.stream.FactoryConfigurationError;
  24 import javax.xml.stream.XMLOutputFactory;
  25 import javax.xml.stream.XMLStreamException;
  26 import javax.xml.stream.XMLStreamWriter;
  27 import org.opendaylight.netconf.sal.rest.api.Draft02;
  28 import org.opendaylight.netconf.sal.rest.api.RestconfNormalizedNodeWriter;
  29 import org.opendaylight.netconf.sal.rest.api.RestconfService;
  30 import org.opendaylight.netconf.sal.restconf.impl.InstanceIdentifierContext;
  31 import org.opendaylight.netconf.sal.restconf.impl.NormalizedNodeContext;
  32 import org.opendaylight.restconf.Draft17;
  33 import org.opendaylight.restconf.utils.RestconfConstants;
  34 import org.opendaylight.yangtools.yang.common.QName;
  35 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  36 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  37 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  38 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  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.RpcDefinition;
  42 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  43 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  44 import javanet.staxutils.IndentingXMLStreamWriter;
  45
  46 @Provider
  47 @Produces({ Draft02.MediaTypes.API + RestconfService.XML, Draft02.MediaTypes.DATA + RestconfService.XML,
  48         Draft02.MediaTypes.OPERATION + RestconfService.XML, Draft17.MediaTypes.DATA + RestconfConstants.XML_ORIG,
  49         MediaType.APPLICATION_XML, MediaType.TEXT_XML })
  50 public class NormalizedNodeXmlBodyWriter implements MessageBodyWriter<NormalizedNodeContext> {
  51
  52     private static final XMLOutputFactory XML_FACTORY;
  53
  54     static {
  55         XML_FACTORY = XMLOutputFactory.newFactory();
  56         XML_FACTORY.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
  57     }
  58
  59     @Override
  60     public boolean isWriteable(final Class<?> type, final Type genericType, final Annotation[] annotations,
  61             final MediaType mediaType) {
  62         return type.equals(NormalizedNodeContext.class);
  63     }
  64
  65     @Override
  66     public long getSize(final NormalizedNodeContext t, final Class<?> type, final Type genericType,
  67             final Annotation[] annotations, final MediaType mediaType) {
  68         return -1;
  69     }
  70
  71     @Override
  72     public void writeTo(final NormalizedNodeContext t, final Class<?> type, final Type genericType,
  73             final Annotation[] annotations, final MediaType mediaType,
  74             final MultivaluedMap<String, Object> httpHeaders, final OutputStream entityStream) throws IOException,
  75             WebApplicationException {
  76         final InstanceIdentifierContext<?> pathContext = t.getInstanceIdentifierContext();
  77         if (t.getData() == null) {
  78             return;
  79         }
  80
  81         XMLStreamWriter xmlWriter;
  82         try {
  83             xmlWriter = XML_FACTORY.createXMLStreamWriter(entityStream);
  84             if (t.getWriterParameters().isPrettyPrint()) {
  85                 xmlWriter = new IndentingXMLStreamWriter(xmlWriter);
  86             }
  87         } catch (final XMLStreamException e) {
  88             throw new IllegalStateException(e);
  89         } catch (final FactoryConfigurationError e) {
  90             throw new IllegalStateException(e);
  91         }
  92         final NormalizedNode<?, ?> data = t.getData();
  93         final SchemaPath schemaPath = pathContext.getSchemaNode().getPath();
  94
  95
  96
  97         writeNormalizedNode(xmlWriter, schemaPath, pathContext, data, t.getWriterParameters().getDepth());
  98
  99     }
 100
 101     private void writeNormalizedNode(final XMLStreamWriter xmlWriter, final SchemaPath schemaPath, final InstanceIdentifierContext<?>
 102             pathContext, NormalizedNode<?, ?> data, final Optional<Integer> depth) throws IOException {
 103         final RestconfNormalizedNodeWriter nnWriter;
 104         final SchemaContext schemaCtx = pathContext.getSchemaContext();
 105         if (SchemaPath.ROOT.equals(schemaPath)) {
 106             nnWriter = createNormalizedNodeWriter(xmlWriter, schemaCtx, schemaPath, depth);
 107             writeElements(xmlWriter, nnWriter, (ContainerNode) data);
 108         }  else if (pathContext.getSchemaNode() instanceof RpcDefinition) {
 109             nnWriter = createNormalizedNodeWriter(xmlWriter, schemaCtx,
 110                     ((RpcDefinition) pathContext.getSchemaNode()).getOutput().getPath(), depth);
 111             writeElements(xmlWriter, nnWriter, (ContainerNode) data);
 112         } else {
 113             nnWriter = createNormalizedNodeWriter(xmlWriter, schemaCtx, schemaPath.getParent(), depth);
 114             if (data instanceof MapEntryNode) {
 115                 // Restconf allows returning one list item. We need to wrap it
 116                 // in map node in order to serialize it properly
 117                 data = ImmutableNodes.mapNodeBuilder(data.getNodeType()).addChild((MapEntryNode) data).build();
 118             }
 119             nnWriter.write(data);
 120         }
 121         nnWriter.flush();
 122     }
 123
 124     private RestconfNormalizedNodeWriter createNormalizedNodeWriter(final XMLStreamWriter xmlWriter,
 125                                                                         final SchemaContext schemaContext, final SchemaPath schemaPath, final Optional<Integer> depth) {
 126         final NormalizedNodeStreamWriter xmlStreamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, schemaContext, schemaPath);
 127         if (depth.isPresent()) {
 128             return DepthAwareNormalizedNodeWriter.forStreamWriter(xmlStreamWriter, depth.get());
 129         } else {
 130             return RestconfDelegatingNormalizedNodeWriter.forStreamWriter(xmlStreamWriter);
 131         }
 132     }
 133
 134     private void writeElements(final XMLStreamWriter xmlWriter, final RestconfNormalizedNodeWriter nnWriter,
 135                                final ContainerNode data)
 136             throws IOException {
 137         try {
 138             final QName name = data.getNodeType();
 139             xmlWriter.writeStartElement(XMLConstants.DEFAULT_NS_PREFIX, name.getLocalName(), name.getNamespace().toString());
 140             xmlWriter.writeDefaultNamespace(name.getNamespace().toString());
 141             for(final NormalizedNode<?,?> child : data.getValue()) {
 142                 nnWriter.write(child);
 143             }
 144             nnWriter.flush();
 145             xmlWriter.writeEndElement();
 146             xmlWriter.flush();
 147         } catch (final XMLStreamException e) {
 148             Throwables.propagate(e);
 149         }
 150     }
 151 }