package org.codehaus.plexus.resource.loader;
   
   /*
    * The MIT License
    *
    * Copyright (c) 2004, The Codehaus
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy of
    * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   * of the Software, and to permit persons to whom the Software is furnished to do
   * so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.JarURLConnection;
  import java.net.URI;
  import java.net.URL;
  import java.util.Enumeration;
  import java.util.Hashtable;
  import java.util.jar.JarEntry;
  import java.util.jar.JarFile;
  
  import org.codehaus.plexus.resource.PlexusResource;
  
  /**
   * A small wrapper around a Jar
   *
   * @author <a href="mailto:daveb@miceda-data.com">Dave Bryson</a>
   * @author Jason van Zyl
   * @version $Id$
   */
  public class JarHolder {
      private final String urlpath;
  
      private JarFile theJar = null;
  
      private JarURLConnection conn = null;
  
      public JarHolder(String urlpath) {
          this.urlpath = urlpath;
  
          try {
              URL url = new URL(urlpath);
  
              conn = (JarURLConnection) url.openConnection();
  
              conn.setAllowUserInteraction(false);
  
              conn.setDoInput(true);
  
              conn.setDoOutput(false);
  
              conn.connect();
  
              theJar = conn.getJarFile();
          } catch (IOException ioe) {
          }
      }
  
      public void close() {
          try {
              theJar.close();
          } catch (Exception e) {
          }
  
          theJar = null;
  
          conn = null;
      }
  
      public InputStream getResource(String theentry) throws ResourceNotFoundException {
          InputStream data = null;
  
          try {
              JarEntry entry = theJar.getJarEntry(theentry);
  
              if (entry != null) {
                  data = theJar.getInputStream(entry);
              }
          } catch (Exception fnfe) {
              throw new ResourceNotFoundException(fnfe.getMessage());
          }
  
          return data;
     }
 
     public Hashtable<String, String> getEntries() {
         Hashtable<String, String> allEntries = new Hashtable<>(559);
 
         if (theJar != null) {
             Enumeration<JarEntry> all = theJar.entries();
 
             while (all.hasMoreElements()) {
                 JarEntry je = all.nextElement();
 
                 // We don't map plain directory entries
                 if (!je.isDirectory()) {
                     allEntries.put(je.getName(), this.urlpath);
                 }
             }
         }
         return allEntries;
     }
 
     public String getUrlPath() {
         return urlpath;
     }
 
     public PlexusResource getPlexusResource(final String name) {
         final JarEntry entry = theJar.getJarEntry(name);
         if (entry == null) {
             return null;
         }
         return new PlexusResource() {
             @Override
             public File getFile() {
                 return null;
             }
 
             @Override
             public InputStream getInputStream() throws IOException {
                 return theJar.getInputStream(entry);
             }
 
             @Override
             public String getName() {
                 return conn.getURL() + name;
             }
 
             @Override
             public URI getURI() {
                 return null;
             }
 
             @Override
             public URL getURL() throws IOException {
                 return new URL(conn.getJarFileURL(), name);
             }
         };
     }
 }