Package org.apache.commons.io.filefilter
Class EmptyFileFilter
java.lang.Object
org.apache.commons.io.filefilter.AbstractFileFilter
org.apache.commons.io.filefilter.EmptyFileFilter
- All Implemented Interfaces:
FileFilter,FilenameFilter,Serializable,FileVisitor<Path>,PathMatcher,PathFilter,PathVisitor,IOFileFilter
This filter accepts files or directories that are empty.
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:
Using Classic IO
File dir = FileUtils.current();
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 = FileUtils.current();
String[] files = dir.list(EmptyFileFilter.NOT_EMPTY);
for (String file : files) {
System.out.println(file);
}
Using NIO
final Path dir = PathUtils.current(); 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());
Deprecating Serialization
Serialization is deprecated and will be removed in 3.0.
- Since:
- 1.3
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final IOFileFilterSingleton instance of empty filterstatic final IOFileFilterSingleton instance of not-empty filterFields inherited from interface org.apache.commons.io.filefilter.IOFileFilter
EMPTY_STRING_ARRAY -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionbooleanChecks to see if the file is empty.accept(Path file, BasicFileAttributes attributes) Checks to see if the file is empty.Methods inherited from class org.apache.commons.io.filefilter.AbstractFileFilter
accept, handle, postVisitDirectory, preVisitDirectory, toString, visitFile, visitFileFailedMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitMethods inherited from interface org.apache.commons.io.filefilter.IOFileFilter
and, matches, negate, or
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Field Details
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EMPTY
Singleton instance of empty filter -
NOT_EMPTY
Singleton instance of not-empty filter
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Constructor Details
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EmptyFileFilter
protected EmptyFileFilter()Restrictive constructor.
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Method Details
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accept
Checks to see if the file is empty.- Specified by:
acceptin interfaceFileFilter- Specified by:
acceptin interfaceIOFileFilter- Overrides:
acceptin classAbstractFileFilter- Parameters:
file- the file or directory to check- Returns:
trueif the file or directory is empty, otherwisefalse.
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accept
Checks to see if the file is empty.- Specified by:
acceptin interfaceIOFileFilter- Specified by:
acceptin interfacePathFilter- Parameters:
file- the file or directory to checkattributes- the file's basic attributes (TODO may be null).- Returns:
trueif the file or directory is empty, otherwisefalse.- Since:
- 2.9.0
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