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.cache; 018 019import org.apache.commons.vfs2.FileName; 020import org.apache.commons.vfs2.FileObject; 021import org.apache.commons.vfs2.FileSystem; 022 023/** 024 * A {@link org.apache.commons.vfs2.FilesCache} implementation. 025 * <p> 026 * This implementation never ever caches a single file. 027 * <p> 028 * <b>Notice</b>: if you use resolveFile(uri) multiple times with the same path, the system will always create a new 029 * instance. Changes on one instance of this file are not seen by the others. 030 */ 031public class NullFilesCache extends AbstractFilesCache { 032 @Override 033 public void putFile(final FileObject file) { 034 } 035 036 @Override 037 public boolean putFileIfAbsent(final FileObject file) { 038 return false; 039 } 040 041 @Override 042 public FileObject getFile(final FileSystem filesystem, final FileName name) { 043 return null; 044 } 045 046 @Override 047 public void clear(final FileSystem filesystem) { 048 } 049 050 @Override 051 public void removeFile(final FileSystem filesystem, final FileName name) { 052 } 053}