1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.vfs2.cache; 18 19 import org.apache.commons.vfs2.FileName; 20 import org.apache.commons.vfs2.FileObject; 21 import org.apache.commons.vfs2.FileSystem; 22 23 /** 24 * A {@link org.apache.commons.vfs2.FilesCache} implementation. 25 * <p> 26 * This implementation never ever caches a single file. 27 * </p> 28 * <p> 29 * <b>Notice</b>: if you use resolveFile(uri) multiple times with the same path, the system will always create a new 30 * instance. Changes on one instance of this file are not seen by the others. 31 * </p> 32 */ 33 public class NullFilesCache extends AbstractFilesCache { 34 35 @Override 36 public void putFile(final FileObject file) { 37 // empty 38 } 39 40 @Override 41 public boolean putFileIfAbsent(final FileObject file) { 42 return false; 43 } 44 45 @Override 46 public FileObject getFile(final FileSystem filesystem, final FileName name) { 47 return null; 48 } 49 50 @Override 51 public void clear(final FileSystem filesystem) { 52 // empty 53 } 54 55 @Override 56 public void removeFile(final FileSystem filesystem, final FileName name) { 57 // empty 58 } 59 }