co.cask.cdap.notifications.NotificationFeedInfoDeserializer.java Source code

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Here is the source code for co.cask.cdap.notifications.NotificationFeedInfoDeserializer.java

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/*
 * Copyright  2016 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.notifications;

import co.cask.cdap.proto.notification.NotificationFeedInfo;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;

import java.lang.reflect.Type;

/**
 * For backwards compatibility, can deserialize either the old Id.NotificationFeed or NotificationFeedInfo jsons into
 * a NotificationFeedInfo.
 */
public class NotificationFeedInfoDeserializer implements JsonDeserializer<NotificationFeedInfo> {

    @Override
    public NotificationFeedInfo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        JsonObject obj = json.getAsJsonObject();

        String category = obj.get("category").getAsString();
        JsonElement descriptionElement = obj.get("description");
        String description = descriptionElement == null ? "" : descriptionElement.getAsString();

        String namespace;
        String feed;
        JsonElement namespaceElement = obj.get("namespace");
        // this means its the old Id.NotificationFeed object where namespace is something like "namespace":{"id":"default"}
        if (namespaceElement.isJsonObject()) {
            namespace = namespaceElement.getAsJsonObject().get("id").getAsString();
            feed = obj.get("name").getAsString();
        } else {
            namespace = namespaceElement.getAsString();
            feed = obj.get("feed").getAsString();
        }

        return new NotificationFeedInfo(namespace, category, feed, description);
    }
}