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.BindingCodecContext;
  16 import org.opendaylight.mdsal.binding.dom.codec.spi.BindingDOMCodecServices;
  17 import org.opendaylight.mdsal.binding.runtime.api.BindingRuntimeContext;
  18 import org.opendaylight.mdsal.binding.runtime.spi.BindingRuntimeHelpers;
  19 import org.opendaylight.yangtools.yang.binding.DataObject;
  20 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
  21 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
  22 import org.opendaylight.yangtools.yang.common.QName;
  23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  24 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  25 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  26 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  27 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  28 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  29 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33
  34
  35 public final class JsonUtil {
  36     private static final Logger LOG = LoggerFactory.getLogger(JsonUtil.class);
  37     private static JsonUtil instance;
  38
  39     private EffectiveModelContext schemaCtx;
  40     private BindingDOMCodecServices bindingDOMCodecServices;
  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         this.schemaCtx = BindingRuntimeHelpers.createEffectiveModel(moduleInfos);
  50         BindingRuntimeContext bindingContext = BindingRuntimeHelpers.createRuntimeContext();
  51         bindingDOMCodecServices = new BindingCodecContext(bindingContext);
  52     }
  53
  54     public static JsonUtil getInstance() {
  55         if (instance == null) {
  56             instance = new JsonUtil();
  57         }
  58         return instance;
  59     }
  60
  61     public DataObject getDataObjectFromJson(JsonReader reader, QName pathQname) {
  62         NormalizedNodeResult result = new NormalizedNodeResult();
  63         try (NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
  64                 JsonParserStream jsonParser = JsonParserStream.create(streamWriter,
  65                     JSONCodecFactorySupplier.RFC7951.getShared(schemaCtx));) {
  66             jsonParser.parse(reader);
  67             YangInstanceIdentifier yangId = YangInstanceIdentifier.of(pathQname);
  68             if (bindingDOMCodecServices.fromNormalizedNode(yangId, result.getResult()) != null) {
  69                 return bindingDOMCodecServices.fromNormalizedNode(yangId, result.getResult()).getValue();
  70             } else {
  71                 return null;
  72             }
  73         } catch (IOException | IllegalArgumentException e) {
  74             LOG.error("Cannot deserialize JSON ", e);
  75             return null;
  76         }
  77
  78     }
  79
  80     public BindingDOMCodecServices getBindingDOMCodecServices() {
  81         return bindingDOMCodecServices;
  82     }
  83 }