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.Map.Entry;
  15 import java.util.ServiceLoader;
  16 import org.opendaylight.mdsal.binding.dom.codec.impl.BindingCodecContext;
  17 import org.opendaylight.mdsal.binding.dom.codec.spi.BindingDOMCodecServices;
  18 import org.opendaylight.mdsal.binding.runtime.api.BindingRuntimeContext;
  19 import org.opendaylight.mdsal.binding.runtime.spi.BindingRuntimeHelpers;
  20 import org.opendaylight.yangtools.yang.binding.DataObject;
  21 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  22 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
  23 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
  24 import org.opendaylight.yangtools.yang.common.QName;
  25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  26 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  27 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  28 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  29 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  30 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  31 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  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 BindingDOMCodecServices bindingDOMCodecServices;
  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         this.schemaCtx = BindingRuntimeHelpers.createEffectiveModel(moduleInfos);
  51         BindingRuntimeContext bindingContext = BindingRuntimeHelpers.createRuntimeContext();
  52         bindingDOMCodecServices = new BindingCodecContext(bindingContext);
  53     }
  54
  55     public static JsonUtil getInstance() {
  56         if (instance == null) {
  57             instance = new JsonUtil();
  58         }
  59         return instance;
  60     }
  61
  62     public DataObject getDataObjectFromJson(JsonReader reader, QName pathQname) {
  63         NormalizedNodeResult result = new NormalizedNodeResult();
  64         try (NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
  65                 JsonParserStream jsonParser = JsonParserStream.create(streamWriter,
  66                     JSONCodecFactorySupplier.RFC7951.getShared(schemaCtx));) {
  67             jsonParser.parse(reader);
  68             YangInstanceIdentifier yangId = YangInstanceIdentifier.of(pathQname);
  69             Entry<InstanceIdentifier<?>, DataObject> entry =
  70                 bindingDOMCodecServices.fromNormalizedNode(yangId, result.getResult());
  71             return entry == null ? null : entry.getValue();
  72         } catch (IOException | IllegalArgumentException e) {
  73             LOG.error("Cannot deserialize JSON ", e);
  74             return null;
  75         }
  76     }
  77
  78     public BindingDOMCodecServices getBindingDOMCodecServices() {
  79         return bindingDOMCodecServices;
  80     }
  81 }