| /* |
| * Copyright 2002-2005 The Apache Software Foundation. |
| * |
| * Licensed 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.zip; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| 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.Selectors; |
| import org.apache.commons.vfs.VfsLog; |
| import org.apache.commons.vfs.provider.AbstractFileSystem; |
| import org.apache.commons.vfs.provider.AbstractFileObject; |
| import org.apache.commons.vfs.provider.UriParser; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.ArrayList; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipFile; |
| |
| /** |
| * A read-only file system for Zip/Jar files. |
| * |
| * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a> |
| * @version $Revision$ $Date$ |
| */ |
| public class ZipFileSystem |
| extends AbstractFileSystem |
| implements FileSystem |
| { |
| private final static Log log = LogFactory.getLog(ZipFileSystem.class); |
| |
| private final File file; |
| private ZipFile zipFile; |
| |
| public ZipFileSystem(final FileName rootName, |
| final FileObject parentLayer, |
| final FileSystemOptions fileSystemOptions) |
| throws FileSystemException |
| { |
| super(rootName, parentLayer, fileSystemOptions); |
| |
| // Make a local copy of the file |
| file = parentLayer.getFileSystem().replicateFile(parentLayer, Selectors.SELECT_SELF); |
| |
| // Open the Zip file |
| if (!file.exists()) |
| { |
| // Don't need to do anything |
| zipFile = null; |
| return; |
| } |
| |
| zipFile = createZipFile(this.file); |
| } |
| |
| public void init() throws FileSystemException |
| { |
| super.init(); |
| |
| // Build the index |
| List strongRef = new ArrayList(100); |
| Enumeration entries = getZipFile().entries(); |
| while (entries.hasMoreElements()) |
| { |
| ZipEntry entry = (ZipEntry) entries.nextElement(); |
| FileName name = getFileSystemManager().resolveName(getRootName(), UriParser.encode(entry.getName())); |
| |
| // Create the file |
| ZipFileObject fileObj; |
| if (entry.isDirectory() && getFileFromCache(name) != null) |
| { |
| fileObj = (ZipFileObject) getFileFromCache(name); |
| fileObj.setZipEntry(entry); |
| continue; |
| } |
| |
| fileObj = createZipFileObject(name, entry); |
| putFileToCache(fileObj); |
| strongRef.add(fileObj); |
| fileObj.holdObject(strongRef); |
| |
| // Make sure all ancestors exist |
| // TODO - create these on demand |
| ZipFileObject parent = null; |
| for (FileName parentName = name.getParent(); |
| parentName != null; |
| fileObj = parent, parentName = parentName.getParent()) |
| { |
| // Locate the parent |
| parent = (ZipFileObject) getFileFromCache(parentName); |
| if (parent == null) |
| { |
| parent = createZipFileObject(parentName, null); |
| putFileToCache(parent); |
| strongRef.add(parent); |
| parent.holdObject(strongRef); |
| } |
| |
| // Attach child to parent |
| parent.attachChild(fileObj.getName()); |
| } |
| } |
| } |
| |
| protected ZipFile getZipFile() throws FileSystemException |
| { |
| if (zipFile == null && this.file.exists()) |
| { |
| ZipFile zipFile = createZipFile(this.file); |
| |
| this.zipFile = zipFile; |
| } |
| |
| return zipFile; |
| } |
| |
| protected ZipFileObject createZipFileObject(final FileName name, |
| final ZipEntry entry) throws FileSystemException |
| { |
| return new ZipFileObject(name, entry, this, true); |
| } |
| |
| protected ZipFile createZipFile(final File file) throws FileSystemException |
| { |
| try |
| { |
| return new ZipFile(file); |
| } |
| catch (IOException ioe) |
| { |
| throw new FileSystemException("vfs.provider.zip/open-zip-file.error", file, ioe); |
| } |
| } |
| |
| protected void doCloseCommunicationLink() |
| { |
| // Release the zip file |
| try |
| { |
| if (zipFile != null) |
| { |
| zipFile.close(); |
| zipFile = null; |
| } |
| } |
| catch (final IOException e) |
| { |
| // getLogger().warn("vfs.provider.zip/close-zip-file.error :" + file, e); |
| VfsLog.warn(getLogger(), log, "vfs.provider.zip/close-zip-file.error :" + file, e); |
| } |
| } |
| |
| /** |
| * Returns the capabilities of this file system. |
| */ |
| protected void addCapabilities(final Collection caps) |
| { |
| caps.addAll(ZipFileProvider.capabilities); |
| } |
| |
| /** |
| * Creates a file object. |
| */ |
| protected FileObject createFile(final FileName name) throws FileSystemException |
| { |
| // This is only called for files which do not exist in the Zip file |
| return new ZipFileObject(name, null, this, false); |
| } |
| } |