com.chainsaw.clearweather.BackgroundFetch.java Source code

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Here is the source code for com.chainsaw.clearweather.BackgroundFetch.java

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/*
The MIT License (MIT)
    
Copyright (c) 2013 Milenko Jovanovic
    
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
    
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
    
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

package com.chainsaw.clearweather;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import org.json.JSONArray;
import org.json.JSONObject;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;

class BackgroundFetch extends AsyncTask<String, Integer, WeatherData> {

    JSONObject weatherData;
    StringBuffer buffer;
    WeatherData returnData = null;
    Context appContext;
    public static final int SERVER_TIMEOUT = 10000;
    public static final int NO_NETWORK = 0;
    public static final int SERVER_ERROR = 1;
    public static final int NO_DATA = 2;
    public static final int DONE = 3;
    private int fetchStatus;

    public BackgroundFetch(Context context) {
        appContext = context;
    }

    @Override
    protected WeatherData doInBackground(String... params) {
        publishProgress(10);

        HttpURLConnection con = null;
        InputStream is = null;

        if (!isNetworkAvailable()) {
            fetchStatus = NO_NETWORK;
        }

        if (isNetworkAvailable()) {

            try {
                con = (HttpURLConnection) (new URL(params[0])).openConnection();
                con.setRequestMethod("GET");
                con.setDoInput(true);
                con.setDoOutput(true);
                con.setConnectTimeout(SERVER_TIMEOUT);
                con.connect();
                buffer = new StringBuffer();
                is = con.getInputStream();
                BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                String line = null;
                while ((line = br.readLine()) != null)
                    buffer.append(line);
                is.close();
                con.disconnect();
            } catch (Throwable t) {
                fetchStatus = SERVER_ERROR;
                t.printStackTrace();
            } finally {
                try {
                    is.close();
                } catch (Throwable t) {
                    fetchStatus = SERVER_ERROR;
                    t.printStackTrace();
                }
                try {
                    con.disconnect();
                } catch (Throwable t) {
                    fetchStatus = SERVER_ERROR;
                    t.printStackTrace();
                }
            }

            try {
                weatherData = (buffer.toString() == null) ? new JSONObject() : new JSONObject(buffer.toString());
                fetchStatus = DONE;
            } catch (Throwable e) {
                fetchStatus = NO_DATA;
                e.printStackTrace();
            }

            is = null;
            con = null;

            try {
                if ((fetchStatus == DONE) && (weatherData != null)) {
                    WeatherData.newDataStatus = DONE;
                    JSONObject mainObj = weatherData.getJSONObject("main");
                    JSONArray weatherObj = weatherData.getJSONArray("weather");
                    returnData = new WeatherData(true, (int) (Math.round(mainObj.getDouble("temp") - 273.15)),
                            ((int) (Math.round(mainObj.getInt("humidity")))), weatherData.getString("name"),
                            ((JSONObject) weatherObj.get(0)).getString("description"));
                }
            } catch (Throwable e) {
                fetchStatus = NO_DATA;
                e.printStackTrace();
            }
        }
        switch (fetchStatus) {
        case NO_DATA:
            WeatherData.newDataStatus = NO_DATA;
            break;
        case SERVER_ERROR:
            WeatherData.newDataStatus = SERVER_ERROR;
            break;
        case NO_NETWORK:
            WeatherData.newDataStatus = NO_NETWORK;
            break;
        }
        if (returnData == null)
            WeatherData.newDataStatus = NO_DATA;

        return returnData;

    }

    private boolean isNetworkAvailable() {
        ConnectivityManager connectivityManager = (ConnectivityManager) appContext
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
    }
}