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 directory Files.walkFileTree(dir, Collections.emptySet(), 1, visitor); System.out.println(visitor.getPathCounters()); System.out.println(visitor.getFileList()); // visitor.getPathCounters().reset(); // // Walk directory 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 SummaryFieldsModifier and TypeFieldDescriptionstatic final IOFileFilterSingleton instance of empty filterstatic final IOFileFilterSingleton instance of not-empty filterFields inherited from interface org.apache.commons.io.filefilter.IOFileFilterEMPTY_STRING_ARRAY
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Constructor SummaryConstructors
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Method SummaryModifier and TypeMethodDescriptionbooleanTests to see if the file is empty.accept(Path file, BasicFileAttributes attributes) Tests to see if the file is empty.Methods inherited from class org.apache.commons.io.filefilter.AbstractFileFilteraccept, handle, postVisitDirectory, preVisitDirectory, toString, visitFile, visitFileFailedMethods inherited from class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitMethods inherited from interface org.apache.commons.io.filefilter.IOFileFilterand, matches, negate, or
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Field Details- 
EMPTYSingleton instance of empty filter
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NOT_EMPTYSingleton instance of not-empty filter
 
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Constructor Details- 
EmptyFileFilterprotected EmptyFileFilter()Restrictive constructor.
 
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Method Details- 
acceptTests to see if the file is empty.- Specified by:
- acceptin interface- FileFilter
- Specified by:
- acceptin interface- IOFileFilter
- Overrides:
- acceptin class- AbstractFileFilter
- Parameters:
- file- the file or directory to check
- Returns:
- trueif the file or directory is empty, otherwise- false.
 
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acceptTests to see if the file is empty.- Specified by:
- acceptin interface- IOFileFilter
- Specified by:
- acceptin interface- PathFilter
- Parameters:
- file- the file or directory to check
- attributes- the path's basic attributes (may be null).
- Returns:
- trueif the file or directory is empty, otherwise- false.
- Since:
- 2.9.0
 
 
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