--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/util/resource/URLResource.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,321 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 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.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.security.Permission;
+
+import org.eclipse.jetty.util.URIUtil;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+/* ------------------------------------------------------------ */
+/** 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 = Resource.__defaultUseCaches;
+    
+    /* ------------------------------------------------------------ */
+    protected URLResource(URL url, URLConnection connection)
+    {
+        _url = url;
+        _urlString=_url.toString();
+        _connection=connection;
+    }
+    
+    /* ------------------------------------------------------------ */
+    protected URLResource (URL url, URLConnection connection, boolean useCaches)
+    {
+        this (url, connection);
+        _useCaches = useCaches;
+    }
+
+    /* ------------------------------------------------------------ */
+    protected synchronized boolean checkConnection()
+    {
+        if (_connection==null)
+        {
+            try{
+                _connection=_url.openConnection();
+                _connection.setUseCaches(_useCaches);
+            }
+            catch(IOException e)
+            {
+                LOG.ignore(e);
+            }
+        }
+        return _connection!=null;
+    }
+
+    /* ------------------------------------------------------------ */
+    /** Release any resources held by the resource.
+     */
+    @Override
+    public synchronized void release()
+    {
+        if (_in!=null)
+        {
+            try{_in.close();}catch(IOException e){LOG.ignore(e);}
+            _in=null;
+        }
+
+        if (_connection!=null)
+            _connection=null;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Returns true if the represented resource exists.
+     */
+    @Override
+    public boolean exists()
+    {
+        try
+        {
+            synchronized(this)
+            {
+                if (checkConnection() && _in==null )
+                    _in = _connection.getInputStream();
+            }
+        }
+        catch (IOException e)
+        {
+            LOG.ignore(e);
+        }
+        return _in!=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() && _url.toString().endsWith("/");
+    }
+
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Returns the last modified time
+     */
+    @Override
+    public long lastModified()
+    {
+        if (checkConnection())
+            return _connection.getLastModified();
+        return -1;
+    }
+
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Return the length of the resource
+     */
+    @Override
+    public long length()
+    {
+        if (checkConnection())
+            return _connection.getContentLength();
+        return -1;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Returns an URL representing the given resource
+     */
+    @Override
+    public URL getURL()
+    {
+        return _url;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * 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 = _connection.getPermission();
+            if (perm instanceof java.io.FilePermission)
+                return new File(perm.getName());
+        }
+
+        // Try the URL file arg
+        try {return new File(_url.getFile());}
+        catch(Exception e) {LOG.ignore(e);}
+
+        // Don't know the file
+        return null;    
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Returns the name of the resource
+     */
+    @Override
+    public String getName()
+    {
+        return _url.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( _in != null)
+            {
+                InputStream in = _in;
+                _in=null;
+                return in;
+            }
+            return _connection.getInputStream();
+        }
+        finally
+        {
+            _connection=null;
+        }
+    }
+
+
+    /* ------------------------------------------------------------ */
+    /**
+     * Returns an output stream to the resource
+     */
+    @Override
+    public OutputStream getOutputStream()
+        throws java.io.IOException, SecurityException
+    {
+        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 renameTo( Resource 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(_url.toExternalForm(),path));
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public String toString()
+    {
+        return _urlString;
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public int hashCode()
+    {
+        return _urlString.hashCode();
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public boolean equals( Object o)
+    {
+        return o instanceof URLResource && _urlString.equals(((URLResource)o)._urlString);
+    }
+
+    /* ------------------------------------------------------------ */
+    public boolean getUseCaches ()
+    {
+        return _useCaches;
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public boolean isContainedIn (Resource containingResource) throws MalformedURLException
+    {
+        return false; //TODO check this!
+    }
+}