org.eclipse.jetty.util.resource.JarFileResource Maven / Gradle / Ivy
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Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
//
// ========================================================================
// Copyright (c) 1995-2012 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.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
class JarFileResource extends JarResource
{
private static final Logger LOG = Log.getLogger(JarFileResource.class);
private JarFile _jarFile;
private File _file;
private String[] _list;
private JarEntry _entry;
private boolean _directory;
private String _jarUrl;
private String _path;
private boolean _exists;
/* -------------------------------------------------------- */
JarFileResource(URL url)
{
super(url);
}
/* ------------------------------------------------------------ */
JarFileResource(URL url, boolean useCaches)
{
super(url, useCaches);
}
/* ------------------------------------------------------------ */
@Override
public synchronized void release()
{
_list=null;
_entry=null;
_file=null;
_jarFile=null;
super.release();
}
/* ------------------------------------------------------------ */
@Override
protected boolean checkConnection()
{
try
{
super.checkConnection();
}
finally
{
if (_jarConnection==null)
{
_entry=null;
_file=null;
_jarFile=null;
_list=null;
}
}
return _jarFile!=null;
}
/* ------------------------------------------------------------ */
@Override
protected synchronized void newConnection()
throws IOException
{
super.newConnection();
_entry=null;
_file=null;
_jarFile=null;
_list=null;
int sep = _urlString.indexOf("!/");
_jarUrl=_urlString.substring(0,sep+2);
_path=_urlString.substring(sep+2);
if (_path.length()==0)
_path=null;
_jarFile=_jarConnection.getJarFile();
_file=new File(_jarFile.getName());
}
/* ------------------------------------------------------------ */
/**
* Returns true if the represented resource exists.
*/
@Override
public boolean exists()
{
if (_exists)
return true;
if (_urlString.endsWith("!/"))
{
String file_url=_urlString.substring(4,_urlString.length()-2);
try{return newResource(file_url).exists();}
catch(Exception e) {LOG.ignore(e); return false;}
}
boolean check=checkConnection();
// Is this a root URL?
if (_jarUrl!=null && _path==null)
{
// Then if it exists it is a directory
_directory=check;
return true;
}
else
{
// Can we find a file for it?
JarFile jarFile=null;
if (check)
// Yes
jarFile=_jarFile;
else
{
// No - so lets look if the root entry exists.
try
{
JarURLConnection c=(JarURLConnection)((new URL(_jarUrl)).openConnection());
c.setUseCaches(getUseCaches());
jarFile=c.getJarFile();
}
catch(Exception e)
{
LOG.ignore(e);
}
}
// Do we need to look more closely?
if (jarFile!=null && _entry==null && !_directory)
{
// OK - we have a JarFile, lets look at the entries for our path
Enumeration e=jarFile.entries();
while(e.hasMoreElements())
{
JarEntry entry = (JarEntry) e.nextElement();
String name=entry.getName().replace('\\','/');
// Do we have a match
if (name.equals(_path))
{
_entry=entry;
// Is the match a directory
_directory=_path.endsWith("/");
break;
}
else if (_path.endsWith("/"))
{
if (name.startsWith(_path))
{
_directory=true;
break;
}
}
else if (name.startsWith(_path) && name.length()>_path.length() && name.charAt(_path.length())=='/')
{
_directory=true;
break;
}
}
if (_directory && !_urlString.endsWith("/"))
{
_urlString+="/";
try
{
_url=new URL(_urlString);
}
catch(MalformedURLException ex)
{
LOG.warn(ex);
}
}
}
}
_exists= ( _directory || _entry!=null);
return _exists;
}
/* ------------------------------------------------------------ */
/**
* Returns true if the represented resource is a container/directory.
* If the resource is not a file, resources ending with "/" are
* considered directories.
*/
@Override
public boolean isDirectory()
{
return _urlString.endsWith("/") || exists() && _directory;
}
/* ------------------------------------------------------------ */
/**
* Returns the last modified time
*/
@Override
public long lastModified()
{
if (checkConnection() && _file!=null)
{
if (exists() && _entry!=null)
return _entry.getTime();
return _file.lastModified();
}
return -1;
}
/* ------------------------------------------------------------ */
@Override
public synchronized String[] list()
{
if (isDirectory() && _list==null)
{
List list = null;
try
{
list = listEntries();
}
catch (Exception e)
{
//Sun's JarURLConnection impl for jar: protocol will close a JarFile in its connect() method if
//useCaches == false (eg someone called URLConnection with defaultUseCaches==true).
//As their sun.net.www.protocol.jar package caches JarFiles and/or connections, we can wind up in
//the situation where the JarFile we have remembered in our _jarFile member has actually been closed
//by other code.
//So, do one retry to drop a connection and get a fresh JarFile
LOG.warn("Retrying list:"+e);
LOG.debug(e);
release();
list = listEntries();
}
if (list != null)
{
_list=new String[list.size()];
list.toArray(_list);
}
}
return _list;
}
/* ------------------------------------------------------------ */
private List listEntries ()
{
checkConnection();
ArrayList list = new ArrayList(32);
JarFile jarFile=_jarFile;
if(jarFile==null)
{
try
{
JarURLConnection jc=(JarURLConnection)((new URL(_jarUrl)).openConnection());
jc.setUseCaches(getUseCaches());
jarFile=jc.getJarFile();
}
catch(Exception e)
{
e.printStackTrace();
LOG.ignore(e);
}
}
Enumeration e=jarFile.entries();
String dir=_urlString.substring(_urlString.indexOf("!/")+2);
while(e.hasMoreElements())
{
JarEntry entry = (JarEntry) e.nextElement();
String name=entry.getName().replace('\\','/');
if(!name.startsWith(dir) || name.length()==dir.length())
{
continue;
}
String listName=name.substring(dir.length());
int dash=listName.indexOf('/');
if (dash>=0)
{
//when listing jar:file urls, you get back one
//entry for the dir itself, which we ignore
if (dash==0 && listName.length()==1)
continue;
//when listing jar:file urls, all files and
//subdirs have a leading /, which we remove
if (dash==0)
listName=listName.substring(dash+1, listName.length());
else
listName=listName.substring(0,dash+1);
if (list.contains(listName))
continue;
}
list.add(listName);
}
return list;
}
/* ------------------------------------------------------------ */
/**
* Return the length of the resource
*/
@Override
public long length()
{
if (isDirectory())
return -1;
if (_entry!=null)
return _entry.getSize();
return -1;
}
/* ------------------------------------------------------------ */
/** Encode according to this resource type.
* File URIs are not encoded.
* @param uri URI to encode.
* @return The uri unchanged.
*/
@Override
public String encode(String uri)
{
return uri;
}
/**
* Take a Resource that possibly might use URLConnection caching
* and turn it into one that doesn't.
* @param resource
* @return the non-caching resource
*/
public static Resource getNonCachingResource (Resource resource)
{
if (!(resource instanceof JarFileResource))
return resource;
JarFileResource oldResource = (JarFileResource)resource;
JarFileResource newResource = new JarFileResource(oldResource.getURL(), false);
return newResource;
}
/**
* Check if this jar:file: resource is contained in the
* named resource. Eg jar:file:///a/b/c/foo.jar!/x.html isContainedIn file:///a/b/c/foo.jar
* @param resource
* @return true if resource is contained in the named resource
* @throws MalformedURLException
*/
@Override
public boolean isContainedIn (Resource resource)
throws MalformedURLException
{
String string = _urlString;
int index = string.indexOf("!/");
if (index > 0)
string = string.substring(0,index);
if (string.startsWith("jar:"))
string = string.substring(4);
URL url = new URL(string);
return url.sameFile(resource.getURL());
}
}