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, visitFileFailed
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
and, negate, or
public static final IOFileFilter EMPTY
public static final IOFileFilter NOT_EMPTY
public boolean accept(File file)
accept
in interface FileFilter
accept
in interface IOFileFilter
accept
in class AbstractFileFilter
file
- 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 PathFilter
accept
in interface IOFileFilter
file
- 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
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