netconf/netconf-util/src/main/java/org/opendaylight/netconf/util/NetconfUtil.java

   1 /*
   2  * Copyright (c) 2013 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.util;
   9
  10 import com.google.common.base.Preconditions;
  11 import java.io.IOException;
  12 import java.net.URISyntaxException;
  13 import java.util.Iterator;
  14 import javax.xml.parsers.ParserConfigurationException;
  15 import javax.xml.stream.XMLOutputFactory;
  16 import javax.xml.stream.XMLStreamException;
  17 import javax.xml.stream.XMLStreamWriter;
  18 import javax.xml.transform.dom.DOMResult;
  19 import javax.xml.transform.dom.DOMSource;
  20 import org.opendaylight.netconf.api.DocumentedException;
  21 import org.opendaylight.netconf.api.xml.XmlElement;
  22 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
  23 import org.opendaylight.netconf.api.xml.XmlUtil;
  24 import org.opendaylight.yangtools.yang.common.QName;
  25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  27 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  28 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  29 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  30 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  31 import org.opendaylight.yangtools.yang.data.codec.xml.XmlCodecFactory;
  32 import org.opendaylight.yangtools.yang.data.codec.xml.XmlParserStream;
  33 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  34 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  35 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  36 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  37 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  38 import org.slf4j.Logger;
  39 import org.slf4j.LoggerFactory;
  40 import org.w3c.dom.Document;
  41 import org.xml.sax.SAXException;
  42
  43 public final class NetconfUtil {
  44
  45     public static final QName NETCONF_QNAME =
  46             QName.create("urn:ietf:params:xml:ns:netconf:base:1.0", "2011-06-01", "netconf").intern();
  47     public static final QName NETCONF_DATA_QNAME = QName.create(NETCONF_QNAME, "data").intern();
  48     public static final XMLOutputFactory XML_FACTORY;
  49
  50     private static final Logger LOG = LoggerFactory.getLogger(NetconfUtil.class);
  51
  52     static {
  53         XML_FACTORY = XMLOutputFactory.newFactory();
  54         XML_FACTORY.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, false);
  55     }
  56
  57     private NetconfUtil() {
  58
  59     }
  60
  61     public static Document checkIsMessageOk(final Document response) throws DocumentedException {
  62         XmlElement element = XmlElement.fromDomDocument(response);
  63         Preconditions.checkState(element.getName().equals(XmlNetconfConstants.RPC_REPLY_KEY));
  64         element = element.getOnlyChildElement();
  65         if (element.getName().equals(XmlNetconfConstants.OK)) {
  66             return response;
  67         }
  68         LOG.warn("Can not load last configuration. Operation failed.");
  69         throw new IllegalStateException("Can not load last configuration. Operation failed: "
  70                 + XmlUtil.toString(response));
  71     }
  72
  73     @SuppressWarnings("checkstyle:IllegalCatch")
  74     public static void writeNormalizedNode(final NormalizedNode<?, ?> normalized, final DOMResult result,
  75                                            final SchemaPath schemaPath, final SchemaContext context)
  76             throws IOException, XMLStreamException {
  77         final XMLStreamWriter writer = XML_FACTORY.createXMLStreamWriter(result);
  78         try (
  79              NormalizedNodeStreamWriter normalizedNodeStreamWriter =
  80                      XMLStreamNormalizedNodeStreamWriter.create(writer, context, schemaPath);
  81              NormalizedNodeWriter normalizedNodeWriter =
  82                      NormalizedNodeWriter.forStreamWriter(normalizedNodeStreamWriter)
  83         ) {
  84             normalizedNodeWriter.write(normalized);
  85             normalizedNodeWriter.flush();
  86         } finally {
  87             try {
  88                 if (writer != null) {
  89                     writer.close();
  90                 }
  91             } catch (final Exception e) {
  92                 LOG.warn("Unable to close resource properly", e);
  93             }
  94         }
  95     }
  96
  97     public static void writeFilter(final YangInstanceIdentifier query, final DOMResult result,
  98             final SchemaPath schemaPath, final SchemaContext context) throws IOException, XMLStreamException {
  99         if (query.isEmpty()) {
 100             // No query at all
 101             return;
 102         }
 103
 104         final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
 105         try {
 106             try (NormalizedNodeStreamWriter writer =
 107                     XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, schemaPath)) {
 108                 final Iterator<PathArgument> it = query.getPathArguments().iterator();
 109                 final PathArgument first = it.next();
 110                 StreamingContext.fromSchemaAndQNameChecked(context, first.getNodeType()).streamToWriter(writer, first,
 111                     it);
 112             }
 113         } finally {
 114             xmlWriter.close();
 115         }
 116     }
 117
 118     public static NormalizedNodeResult transformDOMSourceToNormalizedNode(final SchemaContext schemaContext,
 119             final DOMSource value) throws XMLStreamException, URISyntaxException, IOException, SAXException,
 120             ParserConfigurationException {
 121         final NormalizedNodeResult resultHolder = new NormalizedNodeResult();
 122         final NormalizedNodeStreamWriter writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
 123         final XmlCodecFactory codecs = XmlCodecFactory.create(schemaContext);
 124         final ContainerSchemaNode dataRead = new NodeContainerProxy(NETCONF_DATA_QNAME, schemaContext.getChildNodes());
 125         try (XmlParserStream xmlParserStream = XmlParserStream.create(writer, codecs, dataRead)) {
 126             xmlParserStream.traverse(value);
 127         }
 128         return resultHolder;
 129     }
 130 }