archive.java

来自「结构非常清晰的SIP协议栈」· Java 代码 · 共 165 行

/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * 
 * This file is part of MjSip (http://www.mjsip.org)
 * 
 * MjSip 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.
 * 
 * MjSip 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 MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Author(s):
 * Luca Veltri ([e-mail])
 */

package org.zoolu.tools;


import java.io.*;
import java.net.URL;
//import java.net.URI;
import java.awt.Image;
import java.awt.Toolkit;
import javax.swing.ImageIcon;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;


/** Collection of static methods for handling files and jar archives.
*/
public class Archive
{
   /** The base path */
   public static String BASE_PATH=(new File("")).getAbsolutePath();
   //**** PersonalJava ****
   //public static String BASE_PATH="\\My Documents\\Lavoro\\";


   /** Gets the complete url of a file included within a jar archive. */
   public static URL getJarURL(String jar_archive, String file_name)
   {  if (jar_archive==null || file_name==null) return null;
      // else
      String url="jar:file:"+BASE_PATH+"/"+jar_archive+"!/"+file_name;
      try
      {  return new URL(url);
      }
      catch (java.net.MalformedURLException e)
      {  System.err.println("ERROR: malformed url "+url);
         return null;
      } 
   }


   /** Gets the complete url of a file. */
   public static URL getFileURL(String file_name)
   {  if (file_name==null) return null;
      // else
      String url="file:"+BASE_PATH+"/"+file_name;
      try
      {  return new URL("file:"+BASE_PATH+"/"+file_name);
      }
      catch (java.net.MalformedURLException e)
      {  System.err.println("ERROR: malformed url "+url);
         return null;
      } 
   }


   /** Gets an Image from file */
   public static Image getImage(String file_name)
   {  if (file_name==null) return null;
      //else      
      Toolkit toolkit=Toolkit.getDefaultToolkit();
      Image image=null;
      file_name=BASE_PATH+"/"+file_name;
      if ((new File(file_name)).canRead())
      {  image=toolkit.getImage(file_name);
         // wait for image loading (4 attempts with 80ms of delay)
         for (int i=0; i<4 && image.getWidth(null)<0; i++) try { Thread.sleep(80); } catch (Exception e) {}
      }
      return image;
   }
   
   
   /** Gets an Image from a URL. */
   public static Image getImage(URL url)
   {  if (url==null) return null;
      //else        
      Toolkit toolkit=Toolkit.getDefaultToolkit();
      Image image=null;      
      try
      {  url.openConnection().connect();
         image=toolkit.getImage(url);
         // wait for image loading (4 attempts with 80ms of delay)
         for (int i=0; i<4 && image.getWidth(null)<0; i++) try { Thread.sleep(80); } catch (Exception e) {}
      }
      catch (java.io.IOException e)
      {  System.err.println("ERROR: can't read the file "+url.toString());
      } 
      return image;
   }


   /** Gets an ImageIcon from file */
   public static ImageIcon getImageIcon(String file_name)
   {  file_name=BASE_PATH+"/"+file_name;
      return new ImageIcon(file_name);
   }


   /** Gets an ImageIcon from an URL */
   public static ImageIcon getImageIcon(URL url)
   {  if (url==null) return null;
      //else        
      ImageIcon icon=null;      
      try
      {  url.openConnection().connect();
         icon=new ImageIcon(url);
      }
      catch (java.io.IOException e)
      {  System.err.println("ERROR: can't read the file "+url.toString());
      } 
      return icon;
   }


   /** Gets an InputStream from an URL */
   public static InputStream getInputStream(URL url)
   {  if (url==null) return null;
      //else         
      InputStream in=null;
      try
      {  in=(url).openStream();
      }
      catch (java.io.IOException e)
      {  System.err.println("ERROR: can't read the file "+url.toString());
      } 
      return in;
   }
   
   
   /** Gets an AudioInputStream from an URL */
   public static AudioInputStream getAudioInputStream(URL url) throws javax.sound.sampled.UnsupportedAudioFileException
   {  if (url==null) return null;
      //else         
      AudioInputStream in=null;
      try
      {  in=AudioSystem.getAudioInputStream(url);
      }
      catch (java.io.IOException e)
      {  System.err.println("ERROR: can't read the file "+url.toString());
      } 
      return in;
   }

}