public class EmptyFileFilter extends AbstractFileFilter implements Serializable
If the File is a directory it checks that it contains no files.
Example, showing how to print out a list of the current directory's empty files/directories:
File dir = new File(".");
String[] files = dir.list(EmptyFileFilter.EMPTY);
for (String file : files) {
System.out.println(file);
}
Example, showing how to print out a list of the current directory's non-empty files/directories:
File dir = new File(".");
String[] files = dir.list(EmptyFileFilter.NOT_EMPTY);
for (String file : files) {
System.out.println(file);
}
final Path dir = Paths.get("");
final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(EmptyFileFilter.EMPTY);
//
// 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());
| Modifier and Type | Field and Description |
|---|---|
static IOFileFilter |
EMPTY
Singleton instance of empty filter
|
static IOFileFilter |
NOT_EMPTY
Singleton instance of not-empty filter
|
EMPTY_STRING_ARRAY| Modifier | Constructor and Description |
|---|---|
protected |
EmptyFileFilter()
Restrictive constructor.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
accept(File file)
Checks to see if the file is empty.
|
FileVisitResult |
accept(Path file,
BasicFileAttributes attributes)
Checks to see if the file is empty.
|
accept, handle, postVisitDirectory, preVisitDirectory, toString, visitFile, visitFileFailedclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitand, negate, orpublic static final IOFileFilter EMPTY
public static final IOFileFilter NOT_EMPTY
public boolean accept(File file)
accept in interface FileFilteraccept in interface IOFileFilteraccept in class AbstractFileFilterfile - the file or directory to checktrue if the file or directory is empty, otherwise false.public FileVisitResult accept(Path file, BasicFileAttributes attributes)
accept in interface PathFilteraccept in interface IOFileFilterfile - the file or directory to checkattributes - the file's basic attributes (TODO may be null).true if the file or directory is empty, otherwise false.Copyright © 2002–2021 The Apache Software Foundation. All rights reserved.