/*
* 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.
* <p>
* 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.
* <p>
* 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.
}