Java tutorial
/* * 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.cache; import org.apache.commons.vfs.FileName; import org.apache.commons.vfs.FileObject; import org.apache.commons.vfs.FileSystem; import java.util.HashMap; import java.util.Map; import java.util.TreeMap; /** * A {@link org.apache.commons.vfs.FilesCache} implementation.<br> * This implementation caches every file for the complete lifetime of the used {@link org.apache.commons.vfs.FileSystemManager}. * * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a> * @version $Revision$ $Date$ */ public class DefaultFilesCache extends AbstractFilesCache { private final Map filesystemCache = new HashMap(10); public void putFile(final FileObject file) { Map files = getOrCreateFilesystemCache(file.getFileSystem()); files.put(file.getName(), file); } public FileObject getFile(final FileSystem filesystem, final FileName name) { Map files = getOrCreateFilesystemCache(filesystem); return (FileObject) files.get(name); } public void clear(FileSystem filesystem) { Map files = getOrCreateFilesystemCache(filesystem); files.clear(); } protected Map getOrCreateFilesystemCache(FileSystem filesystem) { Map files = (Map) filesystemCache.get(filesystem); if (files == null) { files = new TreeMap(); filesystemCache.put(filesystem, files); } return files; } public void close() { super.close(); filesystemCache.clear(); } public void removeFile(FileSystem filesystem, FileName name) { Map files = getOrCreateFilesystemCache(filesystem); files.remove(name); } public void touchFile(FileObject file) { } }