Application: gvSIG desktop » Library: org.gvsig.tools

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3

 * 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.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.tools.util;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URISyntaxException;

import java.net.URL;

import org.apache.commons.lang3.StringUtils;

/**

 *

 * @author gvSIG Team

 */

public class URLUtils {

  public static InputStream openStream(URL url) {

    if( url == null ) {

      return null;

    }

    try {

      return url.openStream();

    } catch (IOException ex) {

      // Do nthhing

    }

    // En windows hay un problema con los URL de tipo fichero.

    // A veces se construyen URL de tipo "file" que no son correctas pero

    // que en linux funcionan y en windows no.

    // Tiene que ver con el numero de barras que se pongan detras del "file:".

    // Segun las que se pongan en window interpreta la letra de unidad como

    // el host o como letra de unidad y eso hace que en ocasiones

    // se produzcan errores en windows que no se dan a los desarrolladores

    // en linux.

    // Asi que si falla el openStream de la URL, y es de tipo "file",

    // intentaremos reconstruir el File siendo mas flexibles con interpretacion 

    // de las barras del inicio de la URL.

    //

    String protocol = url.getProtocol();

    String path = url.getPath();

    if( protocol==null || path==null || path.isEmpty() || !protocol.equalsIgnoreCase("file") ) {

      return null;

    }

    File f;

    String host = url.getHost();

    int l = ((host==null)? 0:host.length());

    switch(l) {

      case 0:

        if( path.charAt(0)=='/' || path.charAt(2)==':') { 

          f = new File(path.substring(1));          

        } else {

          f = new File(path);

        }

        break;

      case 1:

        f = new File(host+":"+path);

        break;

      case 2:

        if( host.charAt(1)!=':' ) { // Aqui no lleha con host==null

          return null;

        }

        f = new File(host+path);

        break;

      default:

        return null;

    }

    FileInputStream is;

    try {

      is = new FileInputStream(f);

    } catch (FileNotFoundException ex) {

      return null;

    }

    return is;    

  }

  public static String toPath(URL url) {

      if( url == null ) {

          return null;

      }

      try {

          String path;

          if( StringUtils.contains(url.getPath(), "<%=") ) {

            path = url.getPath();

          } else {

            path = url.toURI().getPath();

          }

          return path;

      } catch (URISyntaxException ex) {

          throw new IllegalArgumentException(ex);

      }

  }

  public static File toFile(URL url) {

      if( url == null ) {

          return null;

      }

      try {

          String path;

          if( StringUtils.contains(url.getPath(), "<%=") ) {

            path = url.getPath();

          } else {

            path = url.toURI().getPath();

          }

          return new File(path);

      } catch (URISyntaxException ex) {

          throw new IllegalArgumentException(ex);

      }

  }

  public static URL toURL(File f) {

      if( f == null ) {

          return null;

      }

      URL url;

      try {

        if( StringUtils.contains(f.getPath(), "<%=") ) {

            url = new URL("file", null, f.getPath());

        } else {

            url = f.toURI().toURL();

        }

      } catch (MalformedURLException ex) {

          throw new IllegalArgumentException(ex);

      }

      return url;

  }

  public static void main(String[] args) throws MalformedURLException {

    File f = new File("C:\\Users\\jolic\\gvSIG\\plugins\\org.gvsig.scripting.app.mainplugin\\2.5.1\\scripts\\addons\\Arena2Reader\\i18n\\text.properties");

    URLUtils.openStream(f.toURI().toURL());

    URLUtils.openStream(new URL("file:/C:/text.properties"));

    URLUtils.openStream(new URL("file://C:/text.properties"));

    URLUtils.openStream(new URL("file:///C:/text.properties"));

  }

}