/*
 * Copyright (c) 2010 Lockheed Martin Corporation
 *
 * 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 org.eurekastreams.web.client.model;

import java.io.Serializable;

import org.eurekastreams.server.domain.PagedSet;
import org.eurekastreams.server.domain.stream.ActivityDTO;
import org.eurekastreams.web.client.events.data.GotStreamResponseEvent;
import org.eurekastreams.web.client.ui.Session;

import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;

/**
 * Stream Model.
 * 
 */
public class StreamModel extends BaseModel implements Fetchable<Serializable>
{
    /**
     * Singleton.
     */
    private static StreamModel model = new StreamModel();

    /**
     * Gets the singleton.
     * 
     * @return the singleton.
     */
    public static StreamModel getInstance()
    {
        return model;
    }

    /**
     * {@inheritDoc}
     */
    public void fetch(final Serializable request, final boolean useClientCacheIfAvailable)
    {
        super.callReadAction("getActivitiesByRequest", request, new OnSuccessCommand<PagedSet<ActivityDTO>>()
        {
            public void onSuccess(final PagedSet<ActivityDTO> response)
            {
                String requestStr = (String) request;

                JSONObject queryObject = JSONParser.parse(requestStr).isObject().get("query").isObject();
                String sortString = queryObject.get("sortBy").isString().stringValue();


                Session.getInstance().getEventBus().notifyObservers(
                        new GotStreamResponseEvent(response, requestStr, sortString));
            }
        }, useClientCacheIfAvailable);
    }
}