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.

   /**
   * Class URLManager
   * Creation: 31/05/2017
   * @version 1.1 31/05/2017
   * @author Ludovic APVRILLE
   * @see
   */

package myutil;

import org.apache.commons.io.FileUtils;

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;

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();
	    }
	}
	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;
        }

    }


}