org.sonarsource.sonarlint.shaded.org.apache.commons.io.filefilter.DirectoryFileFilter Maven / Gradle / Ivy
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Common library used by some SonarLint flavors
/*
* 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.io.filefilter;
import java.io.File;
import java.io.Serializable;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
/**
* This filter accepts {@code File}s that are directories.
*
* For example, here is how to print out a list of the current directory's subdirectories:
*
* Using Classic IO
*
*
* File dir = new File(".");
* String[] files = dir.list(DirectoryFileFilter.INSTANCE);
* for (String file : files) {
* System.out.println(file);
* }
*
*
* Using NIO
*
*
* final Path dir = Paths.get("");
* final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(DirectoryFileFilter.INSTANCE);
* //
* // Walk one dir
* Files.walkFileTree(dir, Collections.emptySet(), 1, visitor);
* System.out.println(visitor.getPathCounters());
* System.out.println(visitor.getFileList());
* //
* visitor.getPathCounters().reset();
* //
* // Walk dir tree
* Files.walkFileTree(dir, visitor);
* System.out.println(visitor.getPathCounters());
* System.out.println(visitor.getDirList());
* System.out.println(visitor.getFileList());
*
*
* @since 1.0
* @see FileFilterUtils#directoryFileFilter()
*/
public class DirectoryFileFilter extends AbstractFileFilter implements Serializable {
/**
* Singleton instance of directory filter.
*
* @since 1.3
*/
public static final IOFileFilter DIRECTORY = new DirectoryFileFilter();
/**
* Singleton instance of directory filter. Please use the identical DirectoryFileFilter.DIRECTORY constant. The new
* name is more JDK 1.5 friendly as it doesn't clash with other values when using static imports.
*/
public static final IOFileFilter INSTANCE = DIRECTORY;
private static final long serialVersionUID = -5148237843784525732L;
/**
* Restrictive constructor.
*/
protected DirectoryFileFilter() {
// empty.
}
/**
* Checks to see if the file is a directory.
*
* @param file the File to check
* @return true if the file is a directory
*/
@Override
public boolean accept(final File file) {
return file.isDirectory();
}
/**
* Checks to see if the file is a directory.
* @param file the File to check
*
* @return true if the file is a directory
* @since 2.9.0
*/
@Override
public FileVisitResult accept(final Path file, final BasicFileAttributes attributes) {
return toFileVisitResult(Files.isDirectory(file), file);
}
}