restconf/restconf-common/src/main/java/org/opendaylight/restconf/common/formatters/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.common.formatters;
   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 public 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     public static final NotificationFormatterFactory FACTORY = new NotificationFormatterFactory() {
  29         @Override
  30         public XMLNotificationFormatter getFormatter(final String xpathFilter) throws XPathExpressionException {
  31             return new XMLNotificationFormatter(xpathFilter);
  32         }
  33
  34         @Override
  35         public XMLNotificationFormatter getFormatter() {
  36             return INSTANCE;
  37         }
  38     };
  39
  40     public XMLNotificationFormatter() {
  41     }
  42
  43     public XMLNotificationFormatter(String xpathFilter) throws XPathExpressionException {
  44         super(xpathFilter);
  45     }
  46
  47     @Override
  48     String createText(EffectiveModelContext schemaContext, DOMNotification input, Instant now,
  49                       boolean leafNodesOnly, boolean skipData)
  50             throws IOException {
  51         final StringWriter writer = new StringWriter();
  52         try {
  53             final XMLStreamWriter xmlStreamWriter = XML_OUTPUT_FACTORY.createXMLStreamWriter(writer);
  54             xmlStreamWriter.setDefaultNamespace(NOTIFICATION_NAMESPACE);
  55
  56             xmlStreamWriter.writeStartElement(NOTIFICATION_NAMESPACE, NOTIFICATION_ELEMENT);
  57             xmlStreamWriter.writeDefaultNamespace(NOTIFICATION_NAMESPACE);
  58
  59             xmlStreamWriter.writeStartElement("eventTime");
  60             xmlStreamWriter.writeCharacters(toRFC3339(now));
  61             xmlStreamWriter.writeEndElement();
  62
  63             final NormalizedNodeStreamWriter nnStreamWriter =
  64                     XMLStreamNormalizedNodeStreamWriter.create(xmlStreamWriter, schemaContext, input.getType());
  65
  66             final NormalizedNodeWriter nnWriter = NormalizedNodeWriter.forStreamWriter(nnStreamWriter);
  67             nnWriter.write(input.getBody());
  68             nnWriter.flush();
  69
  70             xmlStreamWriter.writeEndElement();
  71             xmlStreamWriter.writeEndDocument();
  72             xmlStreamWriter.flush();
  73
  74             nnWriter.close();
  75
  76             return writer.toString();
  77         } catch (XMLStreamException e) {
  78             throw new IOException("Failed to write notification content", e);
  79         }
  80     }
  81 }