restconf/restconf-nb-rfc8040/src/main/java/org/opendaylight/restconf/nb/rfc8040/streams/listeners/JSONNotificationFormatter.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 static java.util.Objects.requireNonNull;
  11
  12 import com.google.gson.stream.JsonWriter;
  13 import java.io.IOException;
  14 import java.io.StringWriter;
  15 import java.io.Writer;
  16 import java.time.Instant;
  17 import javax.xml.xpath.XPathExpressionException;
  18 import org.opendaylight.mdsal.dom.api.DOMNotification;
  19 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  20 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
  21 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  22
  23 final class JSONNotificationFormatter extends NotificationFormatter {
  24     private final JSONCodecFactorySupplier codecSupplier;
  25
  26     private JSONNotificationFormatter(final JSONCodecFactorySupplier codecSupplier) {
  27         this.codecSupplier = requireNonNull(codecSupplier);
  28     }
  29
  30     private JSONNotificationFormatter(final String xpathFilter, final JSONCodecFactorySupplier codecSupplier)
  31             throws XPathExpressionException {
  32         super(xpathFilter);
  33         this.codecSupplier = requireNonNull(codecSupplier);
  34     }
  35
  36     static NotificationFormatterFactory createFactory(final JSONCodecFactorySupplier codecSupplier) {
  37         requireNonNull(codecSupplier);
  38         return new NotificationFormatterFactory() {
  39             @Override
  40             public JSONNotificationFormatter getFormatter(final String xpathFilter)
  41                     throws XPathExpressionException {
  42                 return new JSONNotificationFormatter(xpathFilter, codecSupplier);
  43             }
  44
  45             @Override
  46             public JSONNotificationFormatter getFormatter() {
  47                 return new JSONNotificationFormatter(codecSupplier);
  48             }
  49         };
  50     }
  51
  52     @Override
  53     String createText(final EffectiveModelContext schemaContext, final DOMNotification input, final Instant now,
  54                       final boolean leafNodesOnly, final boolean skipData)
  55             throws IOException {
  56         final Writer writer = new StringWriter();
  57         final JsonWriter jsonWriter = new JsonWriter(writer).beginObject();
  58         jsonWriter.name("ietf-restconf:notification").beginObject();
  59         writeNotificationBody(JSONNormalizedNodeStreamWriter.createNestedWriter(
  60                 codecSupplier.getShared(schemaContext), input.getType(), null, jsonWriter), input.getBody());
  61         jsonWriter.endObject();
  62         jsonWriter.name("event-time").value(toRFC3339(now)).endObject();
  63         jsonWriter.close();
  64         return writer.toString();
  65     }
  66 }