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.xpath.XPathExpressionException;
  15 import org.opendaylight.mdsal.dom.api.DOMNotification;
  16 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  17 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  18 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  19
  20 final class XMLNotificationFormatter extends NotificationFormatter {
  21     private static final XMLNotificationFormatter INSTANCE = new XMLNotificationFormatter();
  22
  23     static final NotificationFormatterFactory FACTORY = new NotificationFormatterFactory() {
  24         @Override
  25         public XMLNotificationFormatter getFormatter(final String xpathFilter) throws XPathExpressionException {
  26             return new XMLNotificationFormatter(xpathFilter);
  27         }
  28
  29         @Override
  30         public XMLNotificationFormatter getFormatter() {
  31             return INSTANCE;
  32         }
  33     };
  34
  35     XMLNotificationFormatter() {
  36
  37     }
  38
  39     XMLNotificationFormatter(final String xpathFilter) throws XPathExpressionException {
  40         super(xpathFilter);
  41     }
  42
  43     @Override
  44     String createText(final EffectiveModelContext schemaContext, final DOMNotification input, final Instant now,
  45                       final boolean leafNodesOnly, final boolean skipData, final boolean changedLeafNodesOnly)
  46             throws IOException {
  47         final var writer = new StringWriter();
  48
  49         try {
  50             final var xmlStreamWriter = NotificationFormatter.createStreamWriterWithNotification(writer, now);
  51             final var nnStreamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlStreamWriter, schemaContext,
  52                 input.getType());
  53
  54             try (var nnWriter = NormalizedNodeWriter.forStreamWriter(nnStreamWriter)) {
  55                 nnWriter.write(input.getBody());
  56                 nnWriter.flush();
  57
  58                 xmlStreamWriter.writeEndElement();
  59                 xmlStreamWriter.writeEndDocument();
  60                 xmlStreamWriter.flush();
  61             }
  62         } catch (XMLStreamException e) {
  63             throw new IOException("Failed to write notification content", e);
  64         }
  65
  66         return writer.toString();
  67     }
  68 }