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/*
 * 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.lucene.mockfile;

import java.io.IOException;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.FileAttribute;

/** 
 * Adds extra files/subdirectories when directories are created.
 * 

* Lucene shouldn't care about these, but sometimes operating systems * create special files themselves (.DS_Store, thumbs.db, .nfsXXX, ...), * so we add them and see what breaks. *

* When a directory is created, sometimes a file or directory named * "extra0" will be included with it. * All other filesystem operations are passed thru as normal. */ public class ExtrasFS extends FilterFileSystemProvider { final boolean active; final boolean createDirectory; /** * Create a new instance, wrapping {@code delegate}. * @param active {@code true} if we should create extra files * @param createDirectory {@code true} if we should create directories instead of files. * Ignored if {@code active} is {@code false}. */ public ExtrasFS(FileSystem delegate, boolean active, boolean createDirectory) { super("extras://", delegate); this.active = active; this.createDirectory = createDirectory; } @Override public void createDirectory(Path dir, FileAttribute... attrs) throws IOException { super.createDirectory(dir, attrs); // ok, we created the directory successfully. if (active) { // lets add a bogus file... if this fails, we don't care, its best effort. try { Path target = dir.resolve("extra0"); if (createDirectory) { super.createDirectory(target); } else { Files.createFile(target); } } catch (Exception ignored) { // best effort } } } // TODO: would be great if we overrode attributes, so file size was always zero for // our fake files. But this is tricky because its hooked into several places. // Currently MDW has a hack so we don't break disk full tests. }





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