me.snowdrop.istio.api.internal.IstioDeserializer Maven / Gradle / Ivy

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/**
 * Copyright 2018 Red Hat, Inc. and/or its affiliates.
 * 
 * Licensed under the Eclipse Public License version 1.0, available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package me.snowdrop.istio.api.internal;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import io.fabric8.kubernetes.api.model.ObjectMeta;
import me.snowdrop.istio.api.model.IstioResource;
import me.snowdrop.istio.api.model.IstioSpec;

import static me.snowdrop.istio.api.internal.IstioSpecRegistry.resolveIstioSpecForKind;

/**
 * @author Christophe Laprun
 */
public class IstioDeserializer extends JsonDeserializer {
    private static final String KIND = "kind";


    @Override
    public IstioResource deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        ObjectNode node = p.readValueAsTree();

        JsonNode kindNode = node.get(KIND);
        if (kindNode != null) {
            final String kind = kindNode.textValue();

            // find the associated spec class
            Class specType = resolveIstioSpecForKind(kind);
            if (specType == null) {
                throw ctxt.mappingException(String.format("No resource type found for kind: %s", kind));
            }

            final String apiVersion = node.get("apiVersion").textValue();

            // deserialize metadata
            final JsonNode metadataNode = node.get("metadata");
            final ObjectMeta metadata = p.getCodec().treeToValue(metadataNode, ObjectMeta.class);

            // deserialize spec
            final JsonNode specNode = node.get("spec");
            final IstioSpec spec = p.getCodec().treeToValue(specNode, specType);


            return new IstioResource(apiVersion, kind, metadata, spec);
        }
        throw new IllegalArgumentException("Cannot process resources without a 'kind' field");
    }
}