001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.vfs2.provider.tar; 018 019import java.util.Arrays; 020import java.util.Collection; 021import java.util.Collections; 022 023import org.apache.commons.vfs2.Capability; 024import org.apache.commons.vfs2.FileName; 025import org.apache.commons.vfs2.FileObject; 026import org.apache.commons.vfs2.FileSystem; 027import org.apache.commons.vfs2.FileSystemException; 028import org.apache.commons.vfs2.FileSystemOptions; 029import org.apache.commons.vfs2.FileType; 030import org.apache.commons.vfs2.provider.AbstractFileName; 031import org.apache.commons.vfs2.provider.AbstractLayeredFileProvider; 032import org.apache.commons.vfs2.provider.LayeredFileName; 033 034/** 035 * A file system provider for Tar files. Provides read-only file systems. 036 */ 037public class TarFileProvider extends AbstractLayeredFileProvider { 038 /** The provider's capabilities */ 039 protected static final Collection<Capability> capabilities = Collections 040 .unmodifiableCollection(Arrays.asList(new Capability[] { Capability.GET_LAST_MODIFIED, Capability.GET_TYPE, 041 Capability.LIST_CHILDREN, Capability.READ_CONTENT, Capability.URI, Capability.VIRTUAL })); 042 043 public TarFileProvider() { 044 super(); 045 } 046 047 /** 048 * Creates a layered file system. This method is called if the file system is not cached. 049 * 050 * @param scheme The URI scheme. 051 * @param file The file to create the file system on top of. 052 * @return The file system. 053 */ 054 @Override 055 protected FileSystem doCreateFileSystem(final String scheme, final FileObject file, 056 final FileSystemOptions fileSystemOptions) throws FileSystemException { 057 final AbstractFileName rootName = new LayeredFileName(scheme, file.getName(), FileName.ROOT_PATH, 058 FileType.FOLDER); 059 return new TarFileSystem(rootName, file, fileSystemOptions); 060 } 061 062 @Override 063 public Collection<Capability> getCapabilities() { 064 return capabilities; 065 } 066}