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.jar; 018 019import java.util.ArrayList; 020import java.util.Arrays; 021import java.util.Collection; 022import java.util.Collections; 023 024import org.apache.commons.vfs2.Capability; 025import org.apache.commons.vfs2.FileName; 026import org.apache.commons.vfs2.FileObject; 027import org.apache.commons.vfs2.FileSystem; 028import org.apache.commons.vfs2.FileSystemException; 029import org.apache.commons.vfs2.FileSystemOptions; 030import org.apache.commons.vfs2.FileType; 031import org.apache.commons.vfs2.provider.AbstractFileName; 032import org.apache.commons.vfs2.provider.LayeredFileName; 033import org.apache.commons.vfs2.provider.zip.ZipFileProvider; 034 035/** 036 * A file system provider for Jar files. Provides read-only file systems. This provides access to Jar specific features 037 * like Signing and Manifest Attributes. 038 */ 039public class JarFileProvider extends ZipFileProvider { 040 static final Collection<Capability> capabilities; 041 042 static { 043 final Collection<Capability> combined = new ArrayList<>(); 044 combined.addAll(ZipFileProvider.capabilities); 045 combined.addAll(Arrays.asList(new Capability[] { Capability.ATTRIBUTES, Capability.FS_ATTRIBUTES, 046 Capability.SIGNING, Capability.MANIFEST_ATTRIBUTES, Capability.VIRTUAL })); 047 capabilities = Collections.unmodifiableCollection(combined); 048 } 049 050 public JarFileProvider() { 051 super(); 052 } 053 054 /** 055 * Creates a layered file system. This method is called if the file system is not cached. 056 * 057 * @param scheme The URI scheme. 058 * @param file The file to create the file system on top of. 059 * @return The file system. 060 */ 061 @Override 062 protected FileSystem doCreateFileSystem(final String scheme, final FileObject file, 063 final FileSystemOptions fileSystemOptions) throws FileSystemException { 064 final AbstractFileName name = new LayeredFileName(scheme, file.getName(), FileName.ROOT_PATH, FileType.FOLDER); 065 return new JarFileSystem(name, file, fileSystemOptions); 066 } 067 068 @Override 069 public Collection<Capability> getCapabilities() { 070 return capabilities; 071 } 072}