Package org.apache.commons.io.filefilter
Class EmptyFileFilter
- java.lang.Object
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- org.apache.commons.io.filefilter.AbstractFileFilter
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- org.apache.commons.io.filefilter.EmptyFileFilter
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- All Implemented Interfaces:
java.io.FileFilter
,java.io.FilenameFilter
,java.io.Serializable
,java.nio.file.FileVisitor<java.nio.file.Path>
,PathFilter
,PathVisitor
,IOFileFilter
public class EmptyFileFilter extends AbstractFileFilter implements java.io.Serializable
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 = 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); }
Using NIO
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());
- Since:
- 1.3
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description static IOFileFilter
EMPTY
Singleton instance of empty filterstatic IOFileFilter
NOT_EMPTY
Singleton instance of not-empty filter-
Fields inherited from interface org.apache.commons.io.filefilter.IOFileFilter
EMPTY_STRING_ARRAY
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
accept(java.io.File file)
Checks to see if the file is empty.java.nio.file.FileVisitResult
accept(java.nio.file.Path file, java.nio.file.attribute.BasicFileAttributes attributes)
Checks to see if the file is empty.-
Methods inherited from class org.apache.commons.io.filefilter.AbstractFileFilter
accept, postVisitDirectory, preVisitDirectory, toString, visitFile, visitFileFailed
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Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.apache.commons.io.filefilter.IOFileFilter
and, negate, or
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Field Detail
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EMPTY
public static final IOFileFilter EMPTY
Singleton instance of empty filter
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NOT_EMPTY
public static final IOFileFilter NOT_EMPTY
Singleton instance of not-empty filter
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Method Detail
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accept
public boolean accept(java.io.File file)
Checks to see if the file is empty.- Specified by:
accept
in interfacejava.io.FileFilter
- Specified by:
accept
in interfaceIOFileFilter
- Overrides:
accept
in classAbstractFileFilter
- Parameters:
file
- the file or directory to check- Returns:
true
if the file or directory is empty, otherwisefalse
.
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accept
public java.nio.file.FileVisitResult accept(java.nio.file.Path file, java.nio.file.attribute.BasicFileAttributes attributes)
Checks to see if the file is empty.- Specified by:
accept
in interfaceIOFileFilter
- Specified by:
accept
in interfacePathFilter
- Parameters:
file
- the file or directory to checkattributes
- the file's basic attributes (TODO may be null).- Returns:
true
if the file or directory is empty, otherwisefalse
.- Since:
- 2.9.0
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