/*
* 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.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.jboss.virtual.VFSUtils;
import org.jboss.virtual.plugins.context.AbstractURLHandler;
import org.jboss.virtual.plugins.context.DelegatingHandler;
import org.jboss.virtual.plugins.context.StructuredVirtualFileHandler;
import org.jboss.virtual.plugins.vfs.helpers.PathTokenizer;
import org.jboss.virtual.spi.LinkInfo;
import org.jboss.virtual.spi.VFSContext;
import org.jboss.virtual.spi.VFSContextFactory;
import org.jboss.virtual.spi.VFSContextFactoryLocator;
import org.jboss.virtual.spi.VirtualFileHandler;
/**
* A handler for link directories.
*
* @author Scott.Stark@jboss.org
* @version $Revision: 1.1 $
*/
public class LinkHandler extends AbstractURLHandler
implements StructuredVirtualFileHandler
{
private static final long serialVersionUID = 1;
/** The link information */
private List<LinkInfo> links;
private HashMap<String, VirtualFileHandler> linkTargets =
new HashMap<String, VirtualFileHandler>(3);
class ParentOfLink extends AbstractURLHandler
implements StructuredVirtualFileHandler
{
private static final long serialVersionUID = 1;
private HashMap<String, VirtualFileHandler> children =
new HashMap<String, VirtualFileHandler>(1);
public ParentOfLink(VFSContext context, VirtualFileHandler parent, URL url, String name)
{
super(context, parent, url, name);
try
{
this.vfsUrl = new URL("vfs" + url.toString());
}
catch (MalformedURLException e)
{
throw new RuntimeException(e);
}
}
void addChild(VirtualFileHandler child, String name)
{
children.put(name, child);
}
public VirtualFileHandler findChild(String path) throws IOException
{
return structuredFindChild(path);
}
public VirtualFileHandler createChildHandler(String name) throws IOException
{
return children.get(name);
}
public List<VirtualFileHandler> getChildren(boolean ignoreErrors) throws IOException
{
return null;
}
public boolean isLeaf() throws IOException
{
return false;
}
}
/**
* Create a new LinkHandler.
*
* @param context the context
* @param parent the parent
* @param uri the uri
* @param name the name
* @param links the links
* @throws IOException for an error accessing the file system
* @throws IllegalArgumentException for a null context, url
* @throws URISyntaxException if the uri cannot be parsed
*/
public LinkHandler(FileSystemContext context, VirtualFileHandler parent, URI uri, String name,
List<LinkInfo> links)
throws IOException, URISyntaxException
{
// TODO: This URL is not consistent with the getName, but does point to the raw link file
super(context, parent, uri.toURL(), name);
this.links = links;
this.vfsUrl = new URL("vfs" + uri.toURL().toString());
// Create handlers for the links and add
for(LinkInfo link : links)
{
String linkName = link.getName();
if( linkName == null )
linkName = VFSUtils.getName(link.getLinkTarget());
if( linkName != null )
{
String[] paths = PathTokenizer.getTokens(linkName);
int n = 0;
VirtualFileHandler linkParent = this;
String atom;
// Look for an existing parent
for(; n < paths.length-1; n ++)
{
atom = paths[n];
try
{
linkParent = linkParent.findChild(atom);
}
catch(IOException e)
{
break;
}
}
// Create any missing parents
for(; n < paths.length-1; n ++)
{
atom = paths[n];
URL polURL = new URL(linkParent.toURI().toURL(), atom);
ParentOfLink pol = new ParentOfLink(this.getVFSContext(), linkParent, polURL, atom);
if( linkParent == this )
{
linkTargets.put(atom, pol);
}
else
{
ParentOfLink prevPOL = (ParentOfLink) linkParent;
prevPOL.addChild(pol, atom);
}
linkParent = pol;
}
// Create the link handler
atom = paths[n];
VirtualFileHandler linkHandler = createLinkHandler(linkParent, atom, link.getLinkTarget());
if( linkParent == this )
{
linkTargets.put(atom, linkHandler);
}
else
{
ParentOfLink prevPOL = (ParentOfLink) linkParent;
prevPOL.addChild(linkHandler, atom);
}
}
}
}
public boolean isLeaf()
{
return false;
}
public List<VirtualFileHandler> getChildren(boolean ignoreErrors) throws IOException
{
return new ArrayList<VirtualFileHandler>(linkTargets.values());
}
public VirtualFileHandler findChild(String path) throws IOException
{
return structuredFindChild(path);
}
public VirtualFileHandler createChildHandler(String name) throws IOException
{
VirtualFileHandler handler = linkTargets.get(name);
if( handler == null )
{
throw new FileNotFoundException("Failed to find link for: "+name+", parent: "+this);
}
return handler;
}
@Override
protected void doClose()
{
super.doClose();
links.clear();
}
protected VirtualFileHandler createLinkHandler(VirtualFileHandler parent, String name, URI linkURI)
throws IOException
{
VFSContextFactory factory = VFSContextFactoryLocator.getFactory(linkURI);
VFSContext context = factory.getVFS(linkURI);
VirtualFileHandler rootHandler = context.getRoot();
// Wrap the handler in a delegate so we can change the parent and name
// TODO: if the factory caches contexts the root handler may not point to the link
return new DelegatingHandler(this.getVFSContext(), parent, name, rootHandler);
}
}