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  //
  //  ========================================================================
  //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
  //  ------------------------------------------------------------------------
  //  All rights reserved. This program and the accompanying materials
  //  are made available under the terms of the Eclipse Public License v1.0
  //  and Apache License v2.0 which accompanies this distribution.
  //
  //      The Eclipse Public License is available at
 //      http://www.eclipse.org/legal/epl-v10.html
 //
 //      The Apache License v2.0 is available at
 //      http://www.opensource.org/licenses/apache2.0.php
 //
 //  You may elect to redistribute this code under either of these licenses.
 //  ========================================================================
 //
 
 package org.eclipse.jetty.util.resource;
 
 import java.io.File;
 import java.net.URL;
 
 
 /* ------------------------------------------------------------ */
Abstract resource class.
 
 public class URLResource extends Resource
 {
     private static final Logger LOG = Log.getLogger(URLResource.class);
     protected URL _url;
     protected String _urlString;
     
     protected URLConnection _connection;
     protected InputStream _in=null;
     transient boolean _useCaches = .;
     
     /* ------------------------------------------------------------ */
     protected URLResource(URL urlURLConnection connection)
     {
          = url;
         =.toString();
         =connection;
     }
     
     /* ------------------------------------------------------------ */
     protected URLResource (URL urlURLConnection connectionboolean useCaches)
     {
         this (urlconnection);
          = useCaches;
     }
 
     /* ------------------------------------------------------------ */
     protected synchronized boolean checkConnection()
     {
         if (==null)
         {
             try{
                 =.openConnection();
                 .setUseCaches();
             }
             catch(IOException e)
             {
                 .ignore(e);
             }
         }
         return !=null;
     }
 
     /* ------------------------------------------------------------ */
    
Release any resources held by the resource.
 
     @Override
     public synchronized void release()
     {
         if (!=null)
         {
             try{.close();}catch(IOException e){.ignore(e);}
             =null;
         }
 
         if (!=null)
             =null;
     }
 
     /* ------------------------------------------------------------ */
    
Returns true if the represented resource exists.
 
     @Override
    public boolean exists()
    {
        try
        {
            synchronized(this)
            {
                if (checkConnection() && ==null )
                     = .getInputStream();
            }
        }
        catch (IOException e)
        {
            .ignore(e);
        }
        return !=null;
    }
    /* ------------------------------------------------------------ */
    
Returns true if the respresenetd resource is a container/directory. If the resource is not a file, resources ending with "/" are considered directories.
    @Override
    public boolean isDirectory()
    {
        return exists() && .toString().endsWith("/");
    }
    /* ------------------------------------------------------------ */
    
Returns the last modified time
    @Override
    public long lastModified()
    {
        if (checkConnection())
            return .getLastModified();
        return -1;
    }
    /* ------------------------------------------------------------ */
    
Return the length of the resource
    @Override
    public long length()
    {
        if (checkConnection())
            return .getContentLength();
        return -1;
    }
    /* ------------------------------------------------------------ */
    
Returns an URL representing the given resource
    @Override
    public URL getURL()
    {
        return ;
    }
    /* ------------------------------------------------------------ */
    
Returns an File representing the given resource or NULL if this is not possible.
    @Override
    public File getFile()
        throws IOException
    {
        // Try the permission hack
        if (checkConnection())
        {
            Permission perm = .getPermission();
            if (perm instanceof java.io.FilePermission)
                return new File(perm.getName());
        }
        // Try the URL file arg
        try {return new File(.getFile());}
        catch(Exception e) {.ignore(e);}
        // Don't know the file
        return null;    
    }
    /* ------------------------------------------------------------ */
    
Returns the name of the resource
    @Override
    public String getName()
    {
        return .toExternalForm();
    }
    /* ------------------------------------------------------------ */
    
Returns an input stream to the resource
    @Override
    public synchronized InputStream getInputStream()
        throws java.io.IOException
    {
        if (!checkConnection())
            throw new IOException"Invalid resource");
        try
        {    
            if != null)
            {
                InputStream in = ;
                =null;
                return in;
            }
            return .getInputStream();
        }
        finally
        {
            =null;
        }
    }
    /* ------------------------------------------------------------ */
    
Returns an output stream to the resource
    @Override
    public OutputStream getOutputStream()
        throws java.io.IOExceptionSecurityException
    {
        throw new IOException"Output not supported");
    }
    /* ------------------------------------------------------------ */
    
Deletes the given resource
    @Override
    public boolean delete()
        throws SecurityException
    {
        throw new SecurityException"Delete not supported");
    }
    /* ------------------------------------------------------------ */
    
Rename the given resource
    @Override
    public boolean renameToResource dest)
        throws SecurityException
    {
        throw new SecurityException"RenameTo not supported");
    }
    /* ------------------------------------------------------------ */
    
Returns a list of resource names contained in the given resource
    @Override
    public String[] list()
    {
        return null;
    }
    /* ------------------------------------------------------------ */
    
Returns the resource contained inside the current resource with the given name
    @Override
    public Resource addPath(String path)
        throws IOException,MalformedURLException
    {
        if (path==null)
            return null;
        path = URIUtil.canonicalPath(path);
        return newResource(URIUtil.addPaths(.toExternalForm(),path));
    }
    /* ------------------------------------------------------------ */
    @Override
    public String toString()
    {
        return ;
    }
    /* ------------------------------------------------------------ */
    @Override
    public int hashCode()
    {
        return .hashCode();
    }
    
    /* ------------------------------------------------------------ */
    @Override
    public boolean equalsObject o)
    {
        return o instanceof URLResource && .equals(((URLResource)o).);
    }
    /* ------------------------------------------------------------ */
    public boolean getUseCaches ()
    {
        return ;
    }
    /* ------------------------------------------------------------ */
    @Override
    public boolean isContainedIn (Resource containingResourcethrows MalformedURLException
    {
        return false//TODO check this!
    }
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