Mercurial Hosting > luan
view src/org/eclipse/jetty/util/resource/URLResource.java @ 978:bdb6eb0fbf93
simplify ChannelEndPoint
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sun, 16 Oct 2016 14:53:43 -0600 |
parents | 8e9db0bbf4f9 |
children |
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// // ======================================================================== // 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.slf4j.Logger; import org.slf4j.LoggerFactory; /* ------------------------------------------------------------ */ /** Abstract resource class. */ public class URLResource extends Resource { private static final Logger LOG = LoggerFactory.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.trace("",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.trace("",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.trace("",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.trace("",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! } }