restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/streams/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;
   9
  10 import com.google.common.annotations.VisibleForTesting;
  11 import com.google.gson.stream.JsonWriter;
  12 import java.io.IOException;
  13 import java.io.StringWriter;
  14 import java.time.Instant;
  15 import javax.xml.xpath.XPathExpressionException;
  16 import org.eclipse.jdt.annotation.NonNull;
  17 import org.opendaylight.mdsal.dom.api.DOMNotification;
  18 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.restconf.rev170126.$YangModuleInfoImpl;
  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 static final @NonNull String NOTIFICATION_NAME =
  25         $YangModuleInfoImpl.getInstance().getName().getLocalName() + ":notification";
  26     @VisibleForTesting
  27     static final JSONNotificationFormatter EMPTY = new JSONNotificationFormatter(TextParameters.EMPTY);
  28
  29     static final NotificationFormatterFactory FACTORY = new NotificationFormatterFactory(EMPTY) {
  30         @Override
  31         public JSONNotificationFormatter getFormatter(final TextParameters textParams, final String xpathFilter)
  32                 throws XPathExpressionException {
  33             return new JSONNotificationFormatter(textParams, xpathFilter);
  34         }
  35
  36         @Override
  37         public JSONNotificationFormatter newFormatter(final TextParameters textParams) {
  38             return new JSONNotificationFormatter(textParams);
  39         }
  40     };
  41
  42     private JSONNotificationFormatter(final TextParameters textParams) {
  43         super(textParams);
  44     }
  45
  46     private JSONNotificationFormatter(final TextParameters textParams, final String xpathFilter)
  47             throws XPathExpressionException {
  48         super(textParams, xpathFilter);
  49     }
  50
  51     @Override
  52     String createText(final TextParameters params, final EffectiveModelContext schemaContext,
  53             final DOMNotification input, final Instant now) throws IOException {
  54         try (var writer = new StringWriter()) {
  55             try (var jsonWriter = new JsonWriter(writer)) {
  56                 jsonWriter.beginObject()
  57                     .name(NOTIFICATION_NAME).beginObject()
  58                         .name("event-time").value(toRFC3339(now));
  59                 writeBody(JSONNormalizedNodeStreamWriter.createNestedWriter(
  60                     JSONCodecFactorySupplier.RFC7951.getShared(schemaContext), input.getType(), null, jsonWriter),
  61                     input.getBody());
  62                 jsonWriter.endObject().endObject();
  63             }
  64             return writer.toString();
  65         }
  66     }
  67 }