de.dhbw.organizer.calendar.backend.manager.NetworkManager.java Source code

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Here is the source code for de.dhbw.organizer.calendar.backend.manager.NetworkManager.java

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/**
 * LICENSE: GPL v3 
 * 
 * Copyright (c) 2013 by
 * Daniel Friedrich <friedrda@dhbw-loerrach.de>
 * Simon Riedinger <riedings@dhbw-loerrach.de>
 * Patrick Strittmatter <strittpa@dhbw-loerrach.de> 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3.0 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package de.dhbw.organizer.calendar.backend.manager;

import java.io.IOException;
import java.io.InputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.http.AndroidHttpClient;
import android.util.Log;

/**
 * 
 * Handels Calendar-Modul specific http requests
 * 
 * @author friedrda
 * 
 *         Thanks to Vivek Parihar http://stackoverflow.com/questions/4238921
 *         /android-detect-whether-there-is-an-internet-connection-available
 * 
 */
public class NetworkManager {

    private static final String TAG = "Calendar Backend NetworkManager";
    private ConnectivityManager connectivityManager;
    private static NetworkManager instance = new NetworkManager();
    static Context mContext;

    NetworkInfo wifiInfo, mobileInfo;

    public static NetworkManager getInstance(Context ctx) {
        mContext = ctx;
        return instance;
    }

    /**
     * tests if device got any internet connection
     * 
     * @return true if availabe, false otherwise
     */
    public boolean isOnline() {
        boolean connected = false;
        try {
            connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);

            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
            connected = networkInfo != null && networkInfo.isAvailable() && networkInfo.isConnected();
            return connected;

        } catch (Exception e) {

            Log.e(TAG, "isOnline() ERROR " + e.toString());
        }
        return connected;
    }

    /**
     * this function tests to download the file from the given URL and returns
     * the HTTP status code
     * 
     * @param url
     * @return http status code, or 0 by any error
     */
    public int testHttpUrl(String url) {

        if (isOnline()) {

            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);

            if (!httpGet.containsHeader("Accept-Encoding")) {
                httpGet.addHeader("Accept-Encoding", "gzip");
            }

            HttpResponse httpResponse = null;

            try {
                httpResponse = httpClient.execute(httpGet);

                int httpStatus = httpResponse.getStatusLine().getStatusCode();
                Log.i(TAG, "url = " + url + " HTTP:  " + httpStatus);
                return httpStatus;

            } catch (ClientProtocolException e) {
                e.printStackTrace();
                Log.e(TAG, "ERROR: " + e.getMessage());
                return 0;
            } catch (IOException e) {
                Log.e(TAG, "ERROR: " + e.getMessage());
                e.printStackTrace();
                return 0;
            } catch (IllegalStateException e) {
                Log.e(TAG, "ERROR: " + e.getMessage());
                e.printStackTrace();
                return 0;
            }
        } else
            return 0;

    }

    /**
     * Downloads a File from the given URl via HTTP GET and gzipped and returns
     * an open InputStream to read from
     * 
     * @param url
     * @return InputStream
     */
    public InputStream downloadHttpFile(String url) {

        if (isOnline()) {

            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);

            if (!httpGet.containsHeader("Accept-Encoding")) {
                httpGet.addHeader("Accept-Encoding", "gzip");
            }

            HttpResponse httpResponse = null;

            try {
                httpResponse = httpClient.execute(httpGet);

                int httpStatus = httpResponse.getStatusLine().getStatusCode();
                Log.i(TAG, "downloadHttpFile()  url = " + url + " HTTP:  " + httpStatus);

                HttpEntity entity = httpResponse.getEntity();

                return AndroidHttpClient.getUngzippedContent(entity);

            } catch (ClientProtocolException e) {
                e.printStackTrace();
                Log.e(TAG, "downloadHttpFile() ERROR: " + e.getMessage());
                return null;
            } catch (IOException e) {
                Log.e(TAG, "downloadHttpFile()  ERROR: " + e.getMessage());
                e.printStackTrace();
                return null;
            }
        } else
            return null;

    }

}