package org.webslinger.commons.vfs.virtual;

 import java.util.Collection;

 import org.apache.commons.vfs.Capability;

 import org.apache.commons.vfs.FileName;

 import org.apache.commons.vfs.FileObject;

 import org.apache.commons.vfs.FileSystem;

 import org.apache.commons.vfs.FileSystemConfigBuilder;

 import org.apache.commons.vfs.FileSystemException;

 import org.apache.commons.vfs.FileSystemOptions;

 import org.apache.commons.vfs.FileType;

 import org.apache.commons.vfs.impl.VirtualFileName;

 import org.apache.commons.vfs.provider.AbstractLayeredFileProvider;

 import org.apache.commons.vfs.provider.LayeredFileName;

 import org.webslinger.commons.vfs.FilteringFileProvider;

 import org.webslinger.commons.vfs.VFSUtil;

 import org.webslinger.commons.vfs.handlers.HandlerFactory;

 import org.webslinger.commons.vfs.handlers.cow.COWStorageHandler;

 public class VirtualFileProvider extends AbstractLayeredFileProvider {

     public VirtualConfigBuilder getConfigBuilder() {

         return VirtualConfigBuilder.getInstance();

     }

     // this is specific to each wrapped base

     public Collection getCapabilities() {

         return FilteringFileProvider.capabilities;

     }

     /**

      * Creates a virtual file system, with the supplied file as its root.

      */

     public FileObject createFileSystem(final FileObject rootFile)

         throws FileSystemException

     {

         final FileName rootName =

             getContext().getFileSystemManager().resolveName(rootFile.getName(), FileName.ROOT_PATH);

         final VirtualFileSystem fs = makeFileSystem(rootName, rootFile, null);

         return fs.getRoot();

     }

     protected VirtualFileSystem makeFileSystem(FileName rootName, FileObject rootMount, FileSystemOptions properties) throws FileSystemException {

         properties = VFSUtil.findFileSystemOptions(rootMount, properties, true);

         VirtualFileSystem fs = new VirtualFileSystem(rootName, properties);

         addComponent(fs);

         HandlerFactory<COWStorageHandler, VirtualFileSystem> factory = getConfigBuilder().getStorageHandlerFactory(properties);

         if (factory == null) getConfigBuilder().setStorageHandlerFactory(properties, new VirtualCOWStateXmlStorageHandlerFactory());

         fs.addJunction(FileName.ROOT_PATH, rootMount);

         return fs;

     }

     /**

      * Creates an empty virtual file system.

      */

     public FileObject createFileSystem(final String rootUri) throws FileSystemException

     {

         final FileName rootName =

             new VirtualFileName(rootUri, FileName.ROOT_PATH, FileType.FOLDER);

         final VirtualFileSystem fs = new VirtualFileSystem(rootName, null);

         addComponent(fs);

         return fs.getRoot();

     }

     protected FileSystem doCreateFileSystem(String scheme, FileObject file, FileSystemOptions properties) throws FileSystemException {

         final FileName rootName = new LayeredFileName(scheme, file.getName(), FileName.ROOT_PATH, file.getType());

         return makeFileSystem(rootName, file, properties);

     }

 }