restconf/restconf-nb-bierman02/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 java.io.IOException;
  11 import java.io.OutputStream;
  12 import java.lang.annotation.Annotation;
  13 import java.lang.reflect.Type;
  14 import java.net.URISyntaxException;
  15 import java.nio.charset.StandardCharsets;
  16 import java.util.Map.Entry;
  17 import javanet.staxutils.IndentingXMLStreamWriter;
  18 import javax.ws.rs.Produces;
  19 import javax.ws.rs.WebApplicationException;
  20 import javax.ws.rs.core.MediaType;
  21 import javax.ws.rs.core.MultivaluedMap;
  22 import javax.ws.rs.ext.MessageBodyWriter;
  23 import javax.ws.rs.ext.Provider;
  24 import javax.xml.XMLConstants;
  25 import javax.xml.stream.FactoryConfigurationError;
  26 import javax.xml.stream.XMLOutputFactory;
  27 import javax.xml.stream.XMLStreamException;
  28 import javax.xml.stream.XMLStreamWriter;
  29 import org.eclipse.jdt.annotation.Nullable;
  30 import org.opendaylight.netconf.sal.rest.api.Draft02;
  31 import org.opendaylight.netconf.sal.rest.api.RestconfNormalizedNodeWriter;
  32 import org.opendaylight.netconf.sal.rest.api.RestconfService;
  33 import org.opendaylight.netconf.util.NetconfUtil;
  34 import org.opendaylight.restconf.common.context.InstanceIdentifierContext;
  35 import org.opendaylight.yangtools.yang.common.QName;
  36 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  37 import org.opendaylight.yangtools.yang.data.api.schema.DOMSourceAnyxmlNode;
  38 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  39 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  40 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  41 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  42 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  43 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  44 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  45 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  46 import org.xml.sax.SAXException;
  47
  48 /**
  49  * Normalized node writer for XML.
  50  *
  51  * @deprecated This class will be replaced by NormalizedNodeXmlBodyWriter from restconf-nb-rfc8040
  52  */
  53 @Deprecated
  54 @Provider
  55 @Produces({
  56     Draft02.MediaTypes.API + RestconfService.XML,
  57     Draft02.MediaTypes.DATA + RestconfService.XML,
  58     Draft02.MediaTypes.OPERATION + RestconfService.XML,
  59     MediaType.APPLICATION_XML,
  60     MediaType.TEXT_XML
  61 })
  62 public class NormalizedNodeXmlBodyWriter implements MessageBodyWriter<NormalizedNodeContext> {
  63
  64     private static final XMLOutputFactory XML_FACTORY;
  65
  66     static {
  67         XML_FACTORY = XMLOutputFactory.newFactory();
  68         XML_FACTORY.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
  69     }
  70
  71     @Override
  72     public boolean isWriteable(final Class<?> type, final Type genericType, final Annotation[] annotations,
  73             final MediaType mediaType) {
  74         return type.equals(NormalizedNodeContext.class);
  75     }
  76
  77     @Override
  78     public long getSize(final NormalizedNodeContext context, final Class<?> type, final Type genericType,
  79             final Annotation[] annotations, final MediaType mediaType) {
  80         return -1;
  81     }
  82
  83     @Override
  84     public void writeTo(final NormalizedNodeContext context, final Class<?> type, final Type genericType,
  85             final Annotation[] annotations, final MediaType mediaType,
  86             final MultivaluedMap<String, Object> httpHeaders, final OutputStream entityStream) throws IOException,
  87             WebApplicationException {
  88         for (final Entry<String, Object> entry : context.getNewHeaders().entrySet()) {
  89             httpHeaders.add(entry.getKey(), entry.getValue());
  90         }
  91         final InstanceIdentifierContext<?> pathContext = context.getInstanceIdentifierContext();
  92         if (context.getData() == null) {
  93             return;
  94         }
  95
  96         XMLStreamWriter xmlWriter;
  97         try {
  98             xmlWriter = XML_FACTORY.createXMLStreamWriter(entityStream, StandardCharsets.UTF_8.name());
  99             if (context.getWriterParameters().isPrettyPrint()) {
 100                 xmlWriter = new IndentingXMLStreamWriter(xmlWriter);
 101             }
 102         } catch (final XMLStreamException | FactoryConfigurationError e) {
 103             throw new IllegalStateException(e);
 104         }
 105         final NormalizedNode data = context.getData();
 106         final SchemaPath schemaPath = pathContext.getSchemaNode().getPath();
 107
 108         writeNormalizedNode(xmlWriter, schemaPath, pathContext, data, context.getWriterParameters().getDepth());
 109     }
 110
 111     private static void writeNormalizedNode(final XMLStreamWriter xmlWriter, final SchemaPath schemaPath,
 112             final InstanceIdentifierContext<?> pathContext, NormalizedNode data, final @Nullable Integer depth)
 113             throws IOException {
 114         final RestconfNormalizedNodeWriter nnWriter;
 115         final EffectiveModelContext schemaCtx = pathContext.getSchemaContext();
 116         if (SchemaPath.ROOT.equals(schemaPath)) {
 117             nnWriter = createNormalizedNodeWriter(xmlWriter, schemaCtx, schemaPath, depth);
 118             if (data instanceof DOMSourceAnyxmlNode) {
 119                 try {
 120                     writeElements(xmlWriter, nnWriter,
 121                             (ContainerNode) NetconfUtil.transformDOMSourceToNormalizedNode(schemaCtx,
 122                                     ((DOMSourceAnyxmlNode)data).body()).getResult());
 123                 } catch (XMLStreamException | URISyntaxException | SAXException e) {
 124                     throw new IOException("Cannot write anyxml", e);
 125                 }
 126             } else {
 127                 writeElements(xmlWriter, nnWriter, (ContainerNode) data);
 128             }
 129         }  else if (pathContext.getSchemaNode() instanceof RpcDefinition) {
 130             nnWriter = createNormalizedNodeWriter(xmlWriter, schemaCtx,
 131                     ((RpcDefinition) pathContext.getSchemaNode()).getOutput().getPath(), depth);
 132             writeElements(xmlWriter, nnWriter, (ContainerNode) data);
 133         } else {
 134             nnWriter = createNormalizedNodeWriter(xmlWriter, schemaCtx, schemaPath.getParent(), depth);
 135             if (data instanceof MapEntryNode) {
 136                 // Restconf allows returning one list item. We need to wrap it
 137                 // in map node in order to serialize it properly
 138                 data = ImmutableNodes.mapNodeBuilder(data.getIdentifier().getNodeType())
 139                     .addChild((MapEntryNode) data)
 140                     .build();
 141             }
 142             nnWriter.write(data);
 143         }
 144         nnWriter.flush();
 145     }
 146
 147     private static RestconfNormalizedNodeWriter createNormalizedNodeWriter(final XMLStreamWriter xmlWriter,
 148             final EffectiveModelContext schemaContext, final SchemaPath schemaPath, final @Nullable Integer depth) {
 149         final NormalizedNodeStreamWriter xmlStreamWriter =
 150                 XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, schemaContext, schemaPath);
 151         if (depth != null) {
 152             return DepthAwareNormalizedNodeWriter.forStreamWriter(xmlStreamWriter, depth);
 153         }
 154
 155         return RestconfDelegatingNormalizedNodeWriter.forStreamWriter(xmlStreamWriter);
 156     }
 157
 158     private static void writeElements(final XMLStreamWriter xmlWriter, final RestconfNormalizedNodeWriter nnWriter,
 159             final ContainerNode data) throws IOException {
 160         final QName name = data.getIdentifier().getNodeType();
 161         try {
 162             xmlWriter.writeStartElement(XMLConstants.DEFAULT_NS_PREFIX, name.getLocalName(),
 163                     name.getNamespace().toString());
 164             xmlWriter.writeDefaultNamespace(name.getNamespace().toString());
 165             for (final NormalizedNode child : data.body()) {
 166                 nnWriter.write(child);
 167             }
 168             nnWriter.flush();
 169             xmlWriter.writeEndElement();
 170             xmlWriter.flush();
 171         } catch (final XMLStreamException e) {
 172             throw new IOException("Failed to write elements", e);
 173         }
 174     }
 175 }