co.cask.cdap.proto.codec.HttpServiceSpecificationCodec.java Source code

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Here is the source code for co.cask.cdap.proto.codec.HttpServiceSpecificationCodec.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package co.cask.cdap.proto.codec;

import co.cask.cdap.api.service.http.HttpServiceHandlerSpecification;
import co.cask.cdap.api.service.http.ServiceHttpEndpoint;
import com.google.common.collect.ImmutableList;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;

import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * GSON codec to serialize/deserialize {@link HttpServiceHandlerSpecification}.
 */
public class HttpServiceSpecificationCodec extends AbstractSpecificationCodec<HttpServiceHandlerSpecification> {
    @Override
    public HttpServiceHandlerSpecification deserialize(JsonElement json, Type typeOfT,
            JsonDeserializationContext context) throws JsonParseException {
        JsonObject jsonObj = json.getAsJsonObject();

        String className = jsonObj.get("className").getAsString();
        String name = jsonObj.get("name").getAsString();
        String description = jsonObj.get("description").getAsString();
        Map<String, String> properties = deserializeMap(jsonObj.get("properties"), context, String.class);
        Set<String> datasets = deserializeSet(jsonObj.get("datasets"), context, String.class);
        List<ServiceHttpEndpoint> endpointsExposed;
        if (isOldSpec(jsonObj)) {
            endpointsExposed = ImmutableList.of();
        } else {
            endpointsExposed = deserializeList(jsonObj.get("endpoints"), context, ServiceHttpEndpoint.class);
        }
        return new HttpServiceHandlerSpecification(className, name, description, properties, datasets,
                endpointsExposed);
    }

    private boolean isOldSpec(JsonObject json) {
        return !json.has("endpoints"); // This field wasn't in the original spec
    }

    @Override
    public JsonElement serialize(HttpServiceHandlerSpecification src, Type typeOfSrc,
            JsonSerializationContext context) {
        JsonObject json = new JsonObject();
        json.addProperty("className", src.getClassName());
        json.addProperty("name", src.getName());
        json.addProperty("description", src.getDescription());
        json.add("properties", serializeMap(src.getProperties(), context, String.class));
        json.add("datasets", serializeSet(src.getDatasets(), context, String.class));
        json.add("endpoints", serializeList(src.getEndpoints(), context, ServiceHttpEndpoint.class));

        return json;
    }
}