VFS-2.0-RC1/core/src/main/java/org/apache/commons/vfs/provider/compressed/CompressedFileFileProvider.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.vfs.provider.compressed;

import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystem;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemOptions;
import org.apache.commons.vfs.FileType;
import org.apache.commons.vfs.provider.AbstractLayeredFileProvider;
import org.apache.commons.vfs.provider.FileProvider;
import org.apache.commons.vfs.provider.LayeredFileName;

import java.util.Collection;

/**
 * A file system provider for compressed files.  Provides read-only file
 * systems.
 *
 * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
 * @version $Revision$ $Date$
 */
public abstract class CompressedFileFileProvider
    extends AbstractLayeredFileProvider
    implements FileProvider
{
    public CompressedFileFileProvider()
    {
        super();
    }

    /**
     * Parses an absolute URI.
     *
     * @param uri The URI to parse.
     */
    /*
    public FileName parseUri(final String uri)
        throws FileSystemException
    {
        return ZipFileName.parseUri(uri);
    }
    */

    /**
     * Creates a layered file system.  This method is called if the file system
     * is not cached.
     *
     * @param scheme The URI scheme.
     * @param file   The file to create the file system on top of.
     * @return The file system.
     */
    protected FileSystem doCreateFileSystem(final String scheme,
                                            final FileObject file,
                                            final FileSystemOptions fileSystemOptions)
        throws FileSystemException
    {
        final FileName name =
            new LayeredFileName(scheme, file.getName(), FileName.ROOT_PATH, FileType.FOLDER);
        return createFileSystem(name, file, fileSystemOptions);
    }

    protected abstract FileSystem createFileSystem(final FileName name, final FileObject file,
                                                   final FileSystemOptions fileSystemOptions)
        throws FileSystemException;

    public abstract Collection getCapabilities();
}