optimize serialization/deserialization

[jacksitlab]

With additional import of odl OSGi-Service
<reference id="parserFactory" interface="org.opendaylight.yangtools.yang.model.parser.api.YangParserFactory" />
it should be much easier to serialize data like ODL does

import com.google.gson.stream.JsonWriter;
import org.opendaylight.binding.runtime.spi.BindingRuntimeHelpers;
import org.opendaylight.mdsal.binding.dom.codec.impl.BindingCodecContext;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.config.rev201208.Configuration;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.config.rev201208.ConfigurationBuilder;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.config.rev201208.configuration.EntryBuilder;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.config.rev201208.configuration.EntryKey;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.common.Uint8;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
import org.opendaylight.yangtools.yang.model.api.SchemaPath;
import org.opendaylight.yangtools.yang.model.parser.api.YangParser;
import org.opendaylight.yangtools.yang.model.parser.api.YangParserException;
import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
import org.opendaylight.yangtools.yang.parser.impl.YangParserFactoryImpl;
...

private void serialize(Configuration configuration) {
    final YangParser parser = this.yangParserFactory.createParser();
    final EffectiveModelContext schemaContext = parser.buildEffectiveModel();
    final NormalizedNode<?, ?> data = BINDING_CONTEXT.toNormalizedNode(
                InstanceIdentifier.create(Configuration.class), configuration).getValue();
    final String json = toJson(data, schemaContext);
}
    private static String toJson(final NormalizedNode<?, ?> node, final EffectiveModelContext schemaContext) {
        final JSONCodecFactory codecFactory = JSONCodecFactorySupplier.RFC7951.createSimple(schemaContext);
        try (StringWriter stringWriter = new StringWriter();
             JsonWriter jsonWriter = new JsonWriter(stringWriter);
             NormalizedNodeWriter nodeStreamer = NormalizedNodeWriter.forStreamWriter(
                     JSONNormalizedNodeStreamWriter.createNestedWriter(codecFactory, SchemaPath.ROOT,
                             schemaContext.getQName().getNamespace(), jsonWriter))) {
            jsonWriter.beginObject();
            nodeStreamer.write(node);
            jsonWriter.endObject();
            return stringWriter.toString();
        } catch (IOException e) {
            throw new IllegalStateException("Failed to convert input node to JSON: " + node, e);
        }
    }

Task is to replace our internal yangtools independent serializer with this one, to solve not covered bugs in the existing serializer