Package org.apache.commons.io.filefilter

Class AbstractFileFilter

java.lang.Object

org.apache.commons.io.filefilter.AbstractFileFilter

All Implemented Interfaces:

FileFilter, FilenameFilter, FileVisitor<Path>, PathFilter, PathVisitor, IOFileFilter

Direct Known Subclasses:

AgeFileFilter, AndFileFilter, CanExecuteFileFilter, CanReadFileFilter, CanWriteFileFilter, DelegateFileFilter, DirectoryFileFilter, EmptyFileFilter, FileEqualsFileFilter, FileFileFilter, HiddenFileFilter, MagicNumberFileFilter, NameFileFilter, NotFileFilter, OrFileFilter, PathEqualsFileFilter, PathVisitorFileFilter, PrefixFileFilter, RegexFileFilter, SizeFileFilter, SuffixFileFilter, SymbolicLinkFileFilter, WildcardFileFilter, WildcardFilter

public abstract class AbstractFileFilter
extends Object
implements IOFileFilter, PathVisitor

Abstracts the implementation of the FileFilter (IO), FilenameFilter (IO), PathFilter (NIO) interfaces via our own IOFileFilter interface.

Note that a subclass MUST override one of the accept methods, otherwise that subclass will infinitely loop.

Since:

1.0

Field Summary

Fields

Modifier and Type	Field	Description
private final FileVisitResult	onAccept	What to do when this filter accepts.
private final FileVisitResult	onReject	What to do when this filter rejects.

Fields inherited from interface org.apache.commons.io.filefilter.IOFileFilter

EMPTY_STRING_ARRAY

Constructor Summary

Constructors

Modifier	Constructor	Description
	AbstractFileFilter()	Constructs a new instance.
protected	AbstractFileFilter(FileVisitResult onAccept, FileVisitResult onReject)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
boolean	accept(File file)	Checks to see if the File should be accepted by this filter.
boolean	accept(File dir, String name)	Checks to see if the File should be accepted by this filter.
(package private) void	append(Object[] array, StringBuilder buffer)
(package private) void	append(List<?> list, StringBuilder buffer)
(package private) FileVisitResult	get(IOSupplier<FileVisitResult> supplier)
protected FileVisitResult	handle(Throwable t)	Handles exceptions caught while accepting.
FileVisitResult	postVisitDirectory(Path dir, IOException exc)
FileVisitResult	preVisitDirectory(Path dir, BasicFileAttributes attributes)
(package private) static FileVisitResult	toDefaultFileVisitResult(boolean accept)
(package private) FileVisitResult	toFileVisitResult(boolean accept)	Converts a boolean into a FileVisitResult.
String	toString()	Provides a String representation of this file filter.
FileVisitResult	visitFile(Path file, BasicFileAttributes attributes)
FileVisitResult	visitFileFailed(Path file, IOException exc)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.commons.io.filefilter.IOFileFilter

accept, and, negate, or

Field Details

onAccept

private final FileVisitResult onAccept

What to do when this filter accepts.

onReject

private final FileVisitResult onReject

What to do when this filter rejects.

Constructor Details

AbstractFileFilter

public AbstractFileFilter()

Constructs a new instance.

AbstractFileFilter

protected AbstractFileFilter(FileVisitResult onAccept,
 FileVisitResult onReject)

Constructs a new instance.

Parameters:

onAccept - What to do on acceptance.

onReject - What to do on rejection.

Since:

2.12.0.

Method Details

toDefaultFileVisitResult

static FileVisitResult toDefaultFileVisitResult(boolean accept)

accept

public boolean accept(File file)

Checks to see if the File should be accepted by this filter.

Specified by:

accept in interface FileFilter

Specified by:

accept in interface IOFileFilter

Parameters:

file - the File to check

Returns:

true if this file matches the test

accept

public boolean accept(File dir,
 String name)

Checks to see if the File should be accepted by this filter.

Specified by:

accept in interface FilenameFilter

Specified by:

accept in interface IOFileFilter

Parameters:

dir - the directory File to check

name - the file name within the directory to check

Returns:

true if this file matches the test

append

void append(List<?> list,
 StringBuilder buffer)

append

void append(Object[] array,
 StringBuilder buffer)

get

FileVisitResult get(IOSupplier<FileVisitResult> supplier)

handle

protected FileVisitResult handle(Throwable t)

Handles exceptions caught while accepting.

Parameters:

t - the caught Throwable.

Returns:

the given Throwable.

Since:

2.9.0

postVisitDirectory

public FileVisitResult postVisitDirectory(Path dir,
 IOException exc)
                                   throws IOException

Specified by:

postVisitDirectory in interface FileVisitor<Path>

Throws:

IOException

preVisitDirectory

public FileVisitResult preVisitDirectory(Path dir,
 BasicFileAttributes attributes)
                                  throws IOException

Specified by:

preVisitDirectory in interface FileVisitor<Path>

Throws:

IOException

toFileVisitResult

FileVisitResult toFileVisitResult(boolean accept)

Converts a boolean into a FileVisitResult.

Parameters:

accept - accepted or rejected.

Returns:

a FileVisitResult.

toString

public String toString()

Provides a String representation of this file filter.

Overrides:

toString in class Object

Returns:

a String representation

visitFile

public FileVisitResult visitFile(Path file,
 BasicFileAttributes attributes)
                          throws IOException

Specified by:

visitFile in interface FileVisitor<Path>

Throws:

IOException

visitFileFailed

public FileVisitResult visitFileFailed(Path file,
 IOException exc)
                                throws IOException

Specified by:

visitFileFailed in interface FileVisitor<Path>

Throws:

IOException