restconf/restconf-nb/src/main/java/org/opendaylight/restconf/server/mdsal/streams/notif/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.server.mdsal.streams.notif;
   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.restconf.server.spi.TextParameters;
  19 import org.opendaylight.yang.svc.v1.urn.ietf.params.xml.ns.yang.ietf.restconf.rev170126.YangModuleInfoImpl;
  20 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  21 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
  22 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  23
  24 final class JSONNotificationFormatter extends NotificationFormatter {
  25     private static final @NonNull String NOTIFICATION_NAME =
  26         YangModuleInfoImpl.getInstance().getName().getLocalName() + ":notification";
  27     @VisibleForTesting
  28     static final JSONNotificationFormatter EMPTY = new JSONNotificationFormatter(TextParameters.EMPTY);
  29
  30     static final NotificationFormatterFactory FACTORY = new NotificationFormatterFactory(EMPTY) {
  31         @Override
  32         public JSONNotificationFormatter getFormatter(final TextParameters textParams, final String xpathFilter)
  33                 throws XPathExpressionException {
  34             return new JSONNotificationFormatter(textParams, xpathFilter);
  35         }
  36
  37         @Override
  38         public JSONNotificationFormatter newFormatter(final TextParameters textParams) {
  39             return new JSONNotificationFormatter(textParams);
  40         }
  41     };
  42
  43     private JSONNotificationFormatter(final TextParameters textParams) {
  44         super(textParams);
  45     }
  46
  47     private JSONNotificationFormatter(final TextParameters textParams, final String xpathFilter)
  48             throws XPathExpressionException {
  49         super(textParams, xpathFilter);
  50     }
  51
  52     @Override
  53     protected String createText(final TextParameters params, final EffectiveModelContext schemaContext,
  54             final DOMNotification input, final Instant now) throws IOException {
  55         try (var writer = new StringWriter()) {
  56             try (var jsonWriter = new JsonWriter(writer)) {
  57                 jsonWriter.beginObject()
  58                     .name(NOTIFICATION_NAME).beginObject()
  59                         .name("event-time").value(toRFC3339(now));
  60                 writeBody(JSONNormalizedNodeStreamWriter.createNestedWriter(
  61                     JSONCodecFactorySupplier.RFC7951.getShared(schemaContext), input.getType(), null, jsonWriter),
  62                     input.getBody());
  63                 jsonWriter.endObject().endObject();
  64             }
  65             return writer.toString();
  66         }
  67     }
  68 }