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Apache Commons VFS is a Virtual File System library.
There is a newer version: 2.9.0
/*
 * 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.vfs2.provider;

import java.util.Collection;

import org.apache.commons.vfs2.Capability;
import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemConfigBuilder;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemOptions;

/**
 * A file provider. Each file provider is responsible for handling files for a particular URI scheme.
 * 
 * A file provider may also implement {@link VfsComponent}.
 */
public interface FileProvider {
    /**
     * Locates a file object, by absolute URI.
     *
     * @param baseFile The base file to use for resolving the individual parts of a compound URI.
     * @param uri The absolute URI of the file to find.
     * @param fileSystemOptions The FileSystemOptions
     * @return The FileObject.
     * @throws FileSystemException if an error occurs locating the file.
     */
    FileObject findFile(final FileObject baseFile, final String uri, final FileSystemOptions fileSystemOptions)
            throws FileSystemException;

    /**
     * Creates a layered file system.
     *
     * @param scheme The URI scheme for the layered file system.
     * @param file The file to build the file system on.
     * @param fileSystemOptions The FileSystemOptions.
     * @return A FileObject in the file system.
     * @throws FileSystemException if an error occurs.
     */
    FileObject createFileSystem(String scheme, FileObject file, FileSystemOptions fileSystemOptions)
            throws FileSystemException;

    /**
     * Gets the configbuilder useable to collect the needed fileSystemOptions.
     *
     * @return a FileSystemConfigBuilder for the particular file system.
     */
    FileSystemConfigBuilder getConfigBuilder();

    /**
     * Get the filesystem capabilities.

     * These are the same as on the filesystem, but available before the first filesystem was instanciated.
     *
     * @return a Collection of the file systems Capabilities.
     */
    Collection getCapabilities();

    /**
     * Parse the URI into a FileName.
     *
     * @param root The base FileName.
     * @param uri The file to be accessed.
     * @return A FileName representing the target file.
     * @throws FileSystemException if an error occurs.
     */
    FileName parseUri(FileName root, String uri) throws FileSystemException;
}