networkmodel/src/test/java/org/opendaylight/transportpce/networkmodel/util/test/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.networkmodel.util.test;
   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.Map.Entry;
  15 import java.util.ServiceLoader;
  16 import org.opendaylight.mdsal.binding.dom.adapter.CurrentAdapterSerializer;
  17 import org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeSerializer;
  18 import org.opendaylight.mdsal.binding.dom.codec.impl.BindingCodecContext;
  19 import org.opendaylight.mdsal.binding.runtime.api.BindingRuntimeContext;
  20 import org.opendaylight.mdsal.binding.runtime.spi.BindingRuntimeHelpers;
  21 import org.opendaylight.yangtools.yang.binding.DataObject;
  22 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  23 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
  24 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
  25 import org.opendaylight.yangtools.yang.common.QName;
  26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  27 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  28 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  29 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  30 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  31 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizationResultHolder;
  32 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35
  36 public final class JsonUtil {
  37     private static final Logger LOG = LoggerFactory.getLogger(JsonUtil.class);
  38     private static JsonUtil instance;
  39
  40     private EffectiveModelContext schemaCtx;
  41     private BindingNormalizedNodeSerializer codecRegistry;
  42
  43     private JsonUtil() {
  44         List<YangModuleInfo> moduleInfos = new LinkedList<>();
  45         ServiceLoader<YangModelBindingProvider> yangProviderLoader = ServiceLoader.load(YangModelBindingProvider.class);
  46         for (YangModelBindingProvider yangModelBindingProvider : yangProviderLoader) {
  47             moduleInfos.add(yangModelBindingProvider.getModuleInfo());
  48         }
  49         /* Create the schema context for loaded models */
  50         schemaCtx = BindingRuntimeHelpers.createEffectiveModel(moduleInfos);
  51         if (schemaCtx == null) {
  52             throw new IllegalStateException("Failed to load schema context");
  53         }
  54         // Create the binding binding normalized node codec registry
  55         BindingRuntimeContext bindingContext = BindingRuntimeHelpers.createRuntimeContext();
  56         codecRegistry = new CurrentAdapterSerializer(new BindingCodecContext(bindingContext));
  57     }
  58
  59     public static JsonUtil getInstance() {
  60         if (instance == null) {
  61             instance = new JsonUtil();
  62         }
  63         return instance;
  64     }
  65
  66     public DataObject getDataObjectFromJson(JsonReader reader, QName pathQname) {
  67         NormalizationResultHolder resultHolder = new NormalizationResultHolder();
  68         try (NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
  69                 JsonParserStream jsonParser = JsonParserStream.create(streamWriter,
  70                         JSONCodecFactorySupplier.RFC7951.getShared(schemaCtx));) {
  71             jsonParser.parse(reader);
  72             YangInstanceIdentifier yangId = YangInstanceIdentifier.of(pathQname);
  73             Entry<InstanceIdentifier<?>, DataObject> entry =
  74                 codecRegistry.fromNormalizedNode(yangId, resultHolder.getResult().data());
  75             return entry == null ? null : entry.getValue();
  76         } catch (IOException | IllegalArgumentException e) {
  77             LOG.error("Cannot deserialize JSON ", e);
  78             return null;
  79         }
  80     }
  81 }