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