/*
* JBoss, Home of Professional Open Source
* Copyright 2006, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.virtual.plugins.context.file;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jboss.virtual.plugins.context.AbstractURLHandler;
import org.jboss.virtual.plugins.context.StructuredVirtualFileHandler;
import org.jboss.virtual.spi.VirtualFileHandler;
/**
* FileHandler.
*
* @author <a href="adrian@jboss.com">Adrian Brock</a>
* @author Scott.Stark@jboss.org
* @version $Revision: 1.1 $
*/
public class FileHandler extends AbstractURLHandler implements StructuredVirtualFileHandler
{
private static final long serialVersionUID = 1;
/** The file */
private transient File file;
/** The child cache */
private transient Map<String, VirtualFileHandler> childCache = Collections.synchronizedMap(new HashMap<String, VirtualFileHandler>());
/**
* Create a new FileHandler.
*
* @param context the context
* @param parent the parent
* @param file the file
* @param url the url
* @throws IOException for an error accessing the file system
* @throws IllegalArgumentException for a null context, url
*/
public FileHandler(FileSystemContext context, VirtualFileHandler parent, File file, URL url) throws IOException
{
super(context, parent, url, file.getName());
this.file = file;
if (file.exists() == false)
throw new FileNotFoundException("File does not exist: " + file.getCanonicalPath());
setVfsUrl(new URL("vfs" + url));
}
/**
* Create a new FileHandler
*
* @param context the context
* @param parent the parent
* @param file the file
* @param uri the uri
* @throws IOException for an error accessing the file system
* @throws IllegalArgumentException for a null context, uri
*/
public FileHandler(FileSystemContext context, VirtualFileHandler parent, File file, URI uri) throws IOException
{
this(context, parent, file, uri.toURL());
}
public URL toVfsUrl() throws MalformedURLException, URISyntaxException
{
if (getVfsUrl() == null)
{
setVfsUrl(new URL("vfs" + getURL()));
}
return getVfsUrl();
}
@Override
public FileSystemContext getVFSContext()
{
return (FileSystemContext) super.getVFSContext();
}
/**
* Get the file for this file handler
*
* @return the file
*/
protected File getFile()
{
checkClosed();
return file;
}
@Override
public long getLastModified()
{
return getFile().lastModified();
}
@Override
public long getSize()
{
return getFile().length();
}
public boolean isLeaf()
{
return getFile().isFile();
}
public boolean isHidden()
{
return getFile().isHidden();
}
public List<VirtualFileHandler> getChildren(boolean ignoreErrors) throws IOException
{
File parent = getFile();
File[] files = parent.listFiles();
if (files == null)
throw new IOException("Error listing files: " + parent.getCanonicalPath());
// We need to validate the files list due to jdk bug 6192331
List<File> tmpFiles = new ArrayList<File>();
for (File file : files)
{
if( file.canRead() == true )
tmpFiles.add(file);
}
if (tmpFiles.isEmpty())
return Collections.emptyList();
files = tmpFiles.toArray(new File[tmpFiles.size()]);
FileSystemContext context = getVFSContext();
List<VirtualFileHandler> result = new ArrayList<VirtualFileHandler>();
Map<String, VirtualFileHandler> newCache = Collections.synchronizedMap(new HashMap<String, VirtualFileHandler>());
Map<String, VirtualFileHandler> oldCache = childCache;
// fill up a new cache with old entries
// old entries no longer existing in directory are purged by not being added to new cache
// we cache handlers so that things like JARs are recreated (optimization)
for (File file : files)
{
try
{
VirtualFileHandler handler;
handler = oldCache.get(file.getName());
// if underlying file has been modified then create a new handler instead of using the cached one
if (handler != null && handler.hasBeenModified())
{
handler = null;
}
if (handler == null)
{
handler = context.createVirtualFileHandler(this, file);
}
result.add(handler);
newCache.put(file.getName(), handler);
}
catch (IOException e)
{
if (ignoreErrors)
log.trace("Ignored: " + e);
else
throw e;
}
}
// cleanup old entries
childCache = newCache;
return result;
}
public VirtualFileHandler createChildHandler(String name) throws IOException
{
FileSystemContext context = getVFSContext();
File parentFile = getFile();
File child = new File(parentFile, name);
VirtualFileHandler handler = childCache.get(name);
// if a child has already been created use that
// if the child has been modified on disk then create a new handler
if (handler != null && handler.hasBeenModified())
{
handler = null;
}
if (handler == null)
{
handler = context.createVirtualFileHandler(this, child);
childCache.put(name, handler);
}
return handler;
}
public VirtualFileHandler getChild(String path) throws IOException
{
return structuredFindChild(path);
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
{
in.defaultReadObject();
// Initialize the transient values
this.file = new File(getURL().getPath());
this.childCache = Collections.synchronizedMap(new HashMap<String, VirtualFileHandler>());
}
}