zack.yovel.clear.controller.foreground.WeatherFragment.java Source code

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Here is the source code for zack.yovel.clear.controller.foreground.WeatherFragment.java

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/*
 * Copyright (c) 2014 Yehezkel (Zack) Yovel
 *
 * 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 zack.yovel.clear.controller.foreground;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;

import zack.yovel.clear.infrastructure.model.datapoints.WeatherReport;
import zack.yovel.clear.infrastructure.persist.IWeatherPersist;

public abstract class WeatherFragment extends Fragment implements IWeatherPersist.IWeatherInflatedListener {

    protected WeatherReport getWeatherReport() {
        WeatherReport output = null;
        IDataProvider<WeatherReport> dataProvider = getDataProvider();
        if (dataProvider != null) {
            output = dataProvider.getData();
        }
        return output;
    }

    private IDataProvider<WeatherReport> getDataProvider() {
        FragmentActivity activity = getActivity();
        try {
            return (IDataProvider<WeatherReport>) activity;
        } catch (ClassCastException e) {
            throw new RuntimeException(
                    activity.getClass().getName() + " must implement " + IDataProvider.class.getName());
        }
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        WeatherReport weatherReport = getWeatherReport();
        if (weatherReport != null) {
            displayWeatherReport(weatherReport);
        }

        Activity activity = getActivity();
        if (activity.getClass().equals(MainActivity.class)) {
            ((MainActivity) activity).addListener(this);
        }
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onPause() {
        Activity activity = getActivity();
        if (activity != null && activity.getClass().equals(MainActivity.class)) {
            ((MainActivity) activity).removeListener(this);
        }
        super.onPause();
    }

    @Override
    public void onWeatherReportReady(WeatherReport weatherReport) {
        displayWeatherReport(weatherReport);
    }

    protected abstract void displayWeatherReport(WeatherReport weatherReport);

    @Override
    public void onReadFailed() {

    }

    /**
     * This interface defines a data provider of some sort.
     * The type of the data will be determined by the implementation.
     * <p/>
     * In Clear! it is meant to define a unified method for activities that
     * host a sub-class of the WeatherFragment class to provide weather
     * info to the fragment.
     *
     * @param <T>
     */
    public interface IDataProvider<T> {
        T getData();
    }
}