fr.eoidb.util.AndroidUrlDownloader.java Source code

Introduction

Here is the source code for fr.eoidb.util.AndroidUrlDownloader.java

Source

/**
 * Copyright (C) 2012 Picon software
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package fr.eoidb.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

import fr.eo.exception.DownloadException;
import fr.eo.xml.util.UrlDownloader;

/**
 * @author picon.software
 *
 */
public final class AndroidUrlDownloader implements UrlDownloader {

    public static final String LOG_TAG = AndroidUrlDownloader.class.getSimpleName();

    @Override
    public InputStream urlToInputStream(Context context, String url) throws DownloadException {

        if (!isNetworkAvailable(context)) {
            throw new DownloadException("No internet connection!");
        }

        try {
            HttpParams httpParameters = new BasicHttpParams();
            // Set the timeout in milliseconds until a connection is established.
            // The default value is zero, that means the timeout is not used.
            int timeoutConnection = 3000;
            HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
            // Set the default socket timeout (SO_TIMEOUT)
            // in milliseconds which is the timeout for waiting for data.
            int timeoutSocket = 5000;
            HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

            HttpClient httpclient = new DefaultHttpClient(httpParameters);

            HttpGet httpget = new HttpGet(url);
            httpget.addHeader("Accept-Encoding", "gzip");

            HttpResponse response;

            response = httpclient.execute(httpget);
            Log.v(LOG_TAG, response.getStatusLine().toString());

            HttpEntity entity = response.getEntity();

            final int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                String message = "Error " + statusCode + " while retrieving url " + url;
                Log.w("AndroidUrlDownloader", message);
                throw new DownloadException(message);
            }

            if (entity != null) {

                InputStream instream = entity.getContent();
                Header contentEncoding = response.getFirstHeader("Content-Encoding");
                if (contentEncoding != null && contentEncoding.getValue().equalsIgnoreCase("gzip")) {
                    Log.v(LOG_TAG, "Accepting gzip for url : " + url);
                    instream = new GZIPInputStream(instream);
                }

                return instream;
            }

        } catch (IllegalStateException e) {
            throw new DownloadException(e);
        } catch (IOException e) {
            throw new DownloadException(e);
        }

        return null;
    }

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

}