Package org.apache.commons.io.filefilter
Class DirectoryFileFilter
- java.lang.Object
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- org.apache.commons.io.filefilter.AbstractFileFilter
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- org.apache.commons.io.filefilter.DirectoryFileFilter
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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 DirectoryFileFilter extends AbstractFileFilter implements java.io.Serializable
This filter acceptsFile
s that are directories.For example, here is how to print out a list of the current directory's subdirectories:
Using Classic IO
File dir = FileUtils.current(); String[] files = dir.list(DirectoryFileFilter.INSTANCE); for (String file : files) { System.out.println(file); }
Using NIO
final Path dir = PathUtils.current(); final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(DirectoryFileFilter.INSTANCE); // // 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:
- 1.0
- See Also:
FileFilterUtils.directoryFileFilter()
, Serialized Form
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Field Summary
Fields Modifier and Type Field Description static IOFileFilter
DIRECTORY
Singleton instance of directory filter.static IOFileFilter
INSTANCE
Singleton instance of directory 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 a directory.java.nio.file.FileVisitResult
accept(java.nio.file.Path file, java.nio.file.attribute.BasicFileAttributes attributes)
Checks to see if the file is a directory.-
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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DIRECTORY
public static final IOFileFilter DIRECTORY
Singleton instance of directory filter.- Since:
- 1.3
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INSTANCE
public static final IOFileFilter INSTANCE
Singleton instance of directory filter. Please use the identical DirectoryFileFilter.DIRECTORY constant. The new name is more JDK 1.5 friendly as it doesn't clash with other values when using static imports.
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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 a directory.- Specified by:
accept
in interfacejava.io.FileFilter
- Specified by:
accept
in interfaceIOFileFilter
- Overrides:
accept
in classAbstractFileFilter
- Parameters:
file
- the File to check- Returns:
- true if the file is a directory
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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 a directory.- Specified by:
accept
in interfaceIOFileFilter
- Specified by:
accept
in interfacePathFilter
- Parameters:
file
- the File to checkattributes
- the file's basic attributes (TODO may be null).- Returns:
- true if the file is a directory
- Since:
- 2.9.0
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