restconf/restconf-nb-rfc8040/src/main/java/org/opendaylight/restconf/nb/rfc8040/streams/listeners/XMLNotificationFormatter.java

   1 /*
   2  * Copyright (c) 2020 PANTHEON.tech, s.r.o. 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.restconf.nb.rfc8040.streams.listeners;
   9
  10 import java.io.IOException;
  11 import java.io.StringWriter;
  12 import java.time.Instant;
  13 import javax.xml.stream.XMLStreamException;
  14 import javax.xml.stream.XMLStreamWriter;
  15 import javax.xml.xpath.XPathExpressionException;
  16 import org.opendaylight.mdsal.dom.api.DOMNotification;
  17 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  18 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  19 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  20 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  21
  22 final class XMLNotificationFormatter extends NotificationFormatter {
  23     private static final XMLNotificationFormatter INSTANCE = new XMLNotificationFormatter();
  24
  25     static final String NOTIFICATION_NAMESPACE = "urn:ietf:params:xml:ns:netconf:notification:1.0";
  26     static final String NOTIFICATION_ELEMENT = "notification";
  27
  28     static final String DATA_CHANGED_NAMESPACE = "urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote";
  29     static final String DATA_CHANGED_NOTIFICATION_ELEMENT = "data-changed-notification";
  30
  31     static final String DATA_CHANGE_EVENT_ELEMENT = "data-change-event";
  32
  33     static final NotificationFormatterFactory FACTORY = new NotificationFormatterFactory() {
  34         @Override
  35         public XMLNotificationFormatter getFormatter(final String xpathFilter) throws XPathExpressionException {
  36             return new XMLNotificationFormatter(xpathFilter);
  37         }
  38
  39         @Override
  40         public XMLNotificationFormatter getFormatter() {
  41             return INSTANCE;
  42         }
  43     };
  44
  45     XMLNotificationFormatter() {
  46
  47     }
  48
  49     XMLNotificationFormatter(final String xpathFilter) throws XPathExpressionException {
  50         super(xpathFilter);
  51     }
  52
  53     @Override
  54     String createText(final EffectiveModelContext schemaContext, final DOMNotification input, final Instant now,
  55                       final boolean leafNodesOnly, final boolean skipData)
  56             throws IOException {
  57         final StringWriter writer = new StringWriter();
  58         try {
  59             final XMLStreamWriter xmlStreamWriter = XML_OUTPUT_FACTORY.createXMLStreamWriter(writer);
  60             xmlStreamWriter.setDefaultNamespace(NOTIFICATION_NAMESPACE);
  61
  62             xmlStreamWriter.writeStartElement(NOTIFICATION_NAMESPACE, NOTIFICATION_ELEMENT);
  63             xmlStreamWriter.writeDefaultNamespace(NOTIFICATION_NAMESPACE);
  64
  65             xmlStreamWriter.writeStartElement("eventTime");
  66             xmlStreamWriter.writeCharacters(toRFC3339(now));
  67             xmlStreamWriter.writeEndElement();
  68
  69             final NormalizedNodeStreamWriter nnStreamWriter =
  70                     XMLStreamNormalizedNodeStreamWriter.create(xmlStreamWriter, schemaContext, input.getType());
  71
  72             final NormalizedNodeWriter nnWriter = NormalizedNodeWriter.forStreamWriter(nnStreamWriter);
  73             nnWriter.write(input.getBody());
  74             nnWriter.flush();
  75
  76             xmlStreamWriter.writeEndElement();
  77             xmlStreamWriter.writeEndDocument();
  78             xmlStreamWriter.flush();
  79
  80             nnWriter.close();
  81
  82             return writer.toString();
  83         } catch (XMLStreamException e) {
  84             throw new IOException("Failed to write notification content", e);
  85         }
  86     }
  87 }