pce/src/test/java/org/opendaylight/transportpce/pce/utils/JsonUtil.java

   1 /*
   2  * Copyright © 2020 Orange Labs, Inc. 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.transportpce.pce.utils;
   9
  10 import com.google.gson.stream.JsonReader;
  11 import java.io.IOException;
  12 import java.util.LinkedList;
  13 import java.util.List;
  14 import java.util.ServiceLoader;
  15 import org.opendaylight.mdsal.binding.dom.codec.impl.BindingNormalizedNodeCodecRegistry;
  16 import org.opendaylight.mdsal.binding.generator.impl.ModuleInfoBackedContext;
  17 import org.opendaylight.mdsal.binding.generator.util.BindingRuntimeContext;
  18 import org.opendaylight.yangtools.yang.binding.DataObject;
  19 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
  20 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
  21 import org.opendaylight.yangtools.yang.common.QName;
  22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  23 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  24 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  25 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  26 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  27 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  28 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32
  33
  34 public final class JsonUtil {
  35     private static final Logger LOG = LoggerFactory.getLogger(JsonUtil.class);
  36     private static JsonUtil instance;
  37
  38     private SchemaContext schemaCtx;
  39
  40     private BindingNormalizedNodeCodecRegistry codecRegistry;
  41
  42     private JsonUtil() {
  43         List<YangModuleInfo> moduleInfos = new LinkedList<>();
  44         ServiceLoader<YangModelBindingProvider> yangProviderLoader = ServiceLoader.load(YangModelBindingProvider.class);
  45         for (YangModelBindingProvider yangModelBindingProvider : yangProviderLoader) {
  46             moduleInfos.add(yangModelBindingProvider.getModuleInfo());
  47         }
  48         /* Create the schema context for loaded models */
  49         ModuleInfoBackedContext moduleInfoBackedCntxt = ModuleInfoBackedContext.create();
  50         moduleInfoBackedCntxt.addModuleInfos(moduleInfos);
  51         schemaCtx = moduleInfoBackedCntxt.getSchemaContext();
  52         if (schemaCtx == null) {
  53             throw new IllegalStateException("Failed to load schema context");
  54         }
  55         // Create the binding binding normalized node codec registry
  56         BindingRuntimeContext bindingRuntimeContext = BindingRuntimeContext.create(moduleInfoBackedCntxt, schemaCtx);
  57         codecRegistry = new BindingNormalizedNodeCodecRegistry(bindingRuntimeContext);
  58     }
  59
  60     public static JsonUtil getInstance() {
  61         if (instance == null) {
  62             instance = new JsonUtil();
  63         }
  64         return instance;
  65     }
  66
  67     public DataObject getDataObjectFromJson(JsonReader reader, QName pathQname) {
  68         NormalizedNodeResult result = new NormalizedNodeResult();
  69         try (NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
  70                 JsonParserStream jsonParser = JsonParserStream.create(streamWriter,
  71                         JSONCodecFactorySupplier.RFC7951.getShared(schemaCtx), schemaCtx);) {
  72             jsonParser.parse(reader);
  73             YangInstanceIdentifier yangId = YangInstanceIdentifier.of(pathQname);
  74             if (codecRegistry.fromNormalizedNode(yangId, result.getResult()) != null) {
  75                 return codecRegistry.fromNormalizedNode(yangId, result.getResult()).getValue();
  76             } else {
  77                 return null;
  78             }
  79         } catch (IOException | IllegalArgumentException e) {
  80             LOG.error("Cannot deserialize JSON ", e);
  81             return null;
  82         }
  83
  84     }
  85 }