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JSON from yang object builder
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M. Ranganathan
I am writing a java opendaylight application. I have a YANG-tool generated java class which I populate with appropriate values and that I would like to POST to another service. I believe JSON-RPC seems to provide me the facility that I need to do this. However, I need to do something more : From the generated Java source, I can use a builder to populate a java object corresponding to the YANG model. I now want to convert this to JSON String so I can log it. I know I need create a NormalizedNode<? ?> from the builder of my YANG model to achieve this but I am not sure how to do that. I would greatly appreciate some pointers / code examples on how to proceed. Thank you in advance for your help. Regards, Ranga -- M. Ranganathan |
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Richard Kosegi
Hi Ranganathan,
You need to inject org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeSerializer into your bean via blueprint. Then you can use something like this: YourClass yourClassInstance = new YourClassBuilder().build(); // This is an instance of your generated class InstanceIdentifier<YourClass> ii = ... //this is instance identifier of your generated class. BindingNormalizedNodeSerializer codec = ... //get this from OSGi registry via Blueprint Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> e = codec = toNormalizedNode(ii, yourClassInstance); Now you have NormalizedNode and YangInstanceIdentifier in Entry. To create JSON, you can use this: private static final JSONCodecFactorySupplier CODEC_SUPPLIER = JSONCodecFactorySupplier.DRAFT_LHOTKA_NETMOD_YANG_JSON_02; JSONCodecFactory jsonCodecFactory = JSONCodecFactorySupplier.DRAFT_LHOTKA_NETMOD_YANG_JSON_02 .createLazy(schemaContext); try (NormalizedNodeWriter nnWriter = NormalizedNodeWriter.forStreamWriter( JSONNormalizedNodeStreamWriter.createNestedWriter(codecFactory, yii, null, jsonWriter), true)) { nnWriter.write(node); nnWriter.flush(); jsonWriter.endObject(); } You can obtain SchemaContext from org.opendaylight.mdsal.dom.api.DOMSchemaService (inject via blueprint) Codec itself is imported via <dependency> <groupId>org.opendaylight.yangtools</groupId> <artifactId>yang-data-codec-gson</artifactId> </dependency> in your pom.xml Here is an example how we usie this in json-rpc https://github.com/opendaylight/jsonrpc/blob/master/impl/src/main/java/org/opendaylight/jsonrpc/impl/JsonConverter.java#L275 Regards, Richard.
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