URLManager.java

/* Copyright or (C) or Copr. GET / ENST, Telecom-Paris, Ludovic Apvrille
 * 
 * ludovic.apvrille AT enst.fr
 * 
 * This software is a computer program whose purpose is to allow the
 * edition of TURTLE analysis, design and deployment diagrams, to
 * allow the generation of RT-LOTOS or Java code from this diagram,
 * and at last to allow the analysis of formal validation traces
 * obtained from external tools, e.g. RTL from LAAS-CNRS and CADP
 * from INRIA Rhone-Alpes.
 * 
 * This software is governed by the CeCILL  license under French law and
 * abiding by the rules of distribution of free software.  You can  use,
 * modify and/ or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL
 * "http://www.cecill.info".
 * 
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 * 
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 * 
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 */


package myutil;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Class URLManager
 * Creation: 31/05/2017
 *
 * @author Ludovic APVRILLE
 * @version 1.1 31/05/2017
 */
public final class URLManager implements Runnable {

    private String url;
    private boolean busy;
    private String path;
    private CallbackLoaderInterface callback;

    public URLManager() {
        busy = false;
    }

    public synchronized boolean downloadFile(String _path, String _url, CallbackLoaderInterface _callback) {
        if (busy) {
            return false;
        }
        busy = true;

        path = _path;
        url = _url;
        callback = _callback;

        Thread t = new Thread(this);
        t.start();
        return true;

    }

    public void run() {
        try {
            String urlF = getRealURL(url);
            File f = new File(path);
            org.apache.commons.io.FileUtils.copyURLToFile(new URL(urlF), f);
            if (callback != null) {
                callback.loadDone();
            }
        } catch (Exception e) {
            if (callback != null) {
                callback.loadFailed(e);
            }
        }
        busy = false;
    }

    public static String getRealURL(String url) {
        try {
            HttpURLConnection connection;
            URL file = new URL(url);
            connection = (HttpURLConnection) (file.openConnection());
            String redirect = connection.getHeaderField("Location");
            if (redirect != null) {
                return redirect;
            }
        } catch (Exception e) {
            TraceManager.addDev("Exception in getRealURL =" + e.getMessage());
        }
        return url;

    }

    public static String getBaseURL(String url) {
        int index = url.lastIndexOf("/");
        if (index == -1) {
            return url;
        }
        return url.substring(0, index + 1);
    }

    public static BufferedReader getBufferedReader(String url) {
        try {
            String urlR = getRealURL(url);
            HttpURLConnection connection;
            URL file = new URL(urlR);
            connection = (HttpURLConnection) (file.openConnection());
            return new BufferedReader(new InputStreamReader(connection.getInputStream()));
        } catch (Exception e) {
            TraceManager.addDev("Exception in getBufferedReader =" + e.getMessage());
        }
        return null;
    }

    public static BufferedImage getBufferedImageFromURL(String url) {
        TraceManager.addDev("getBufferedImageFromURL with url=" + url);
        try {
            return ImageIO.read(new URL(getRealURL(url)));
        } catch (Exception e) {
            TraceManager.addDev("Exception in getBufferedImageFromURL =" + e.getMessage());
            return null;
        }

    }


}