backupmanagment

Class DeleteFileVisitor

java.lang.Object

backupmanagment.DeleteFileVisitor

All Implemented Interfaces:

java.nio.file.FileVisitor<java.nio.file.Path>

 class DeleteFileVisitor
extends java.lang.Object
implements java.nio.file.FileVisitor<java.nio.file.Path>

Implementation of the FileVisitor interface. Takes care of removing the files that were deleted in the original directory and are therefore no longer needed.
This delete functionality is deliberately seperated from the BackupFileVisitor in order to allow for easy implementation of the case where the user wishes to keep all the files ever created in the original directory.
Created by Martin Sicho on 22.3.14.

Field Summary

Fields

Modifier and Type	Field and Description
private BackupInstance	mBackupInstance

Constructor Summary

Constructors

Constructor and Description
DeleteFileVisitor(BackupInstance instance) The DeleteFileVisitor constructor.

Method Summary

Methods

Modifier and Type	Method and Description
java.nio.file.FileVisitResult	postVisitDirectory(java.nio.file.Path dir, java.io.IOException exc) Invoked for a directory after entries in the directory, and all of their descendants, have been visited.
java.nio.file.FileVisitResult	preVisitDirectory(java.nio.file.Path dir, java.nio.file.attribute.BasicFileAttributes attrs) Invoked for a directory before entries in the directory are visited.
java.nio.file.FileVisitResult	visitFile(java.nio.file.Path file, java.nio.file.attribute.BasicFileAttributes attrs) Invoked for a file in a directory.
java.nio.file.FileVisitResult	visitFileFailed(java.nio.file.Path file, java.io.IOException exc) Invoked for a file that could not be visited.

Methods inherited from class java.lang.Object

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

Field Detail

mBackupInstance

private BackupInstance mBackupInstance

Constructor Detail

DeleteFileVisitor

DeleteFileVisitor(BackupInstance instance)

The DeleteFileVisitor constructor. It takes an instance of BackupInstance to perform the delete actions.

Parameters:

instance - instance of BackupInstance to perform the backup actions

Method Detail

preVisitDirectory

public java.nio.file.FileVisitResult preVisitDirectory(java.nio.file.Path dir,
                                              java.nio.file.attribute.BasicFileAttributes attrs)
                                                throws java.io.IOException

Invoked for a directory before entries in the directory are visited.

If this method returns CONTINUE, then entries in the directory are visited. If this method returns SKIP_SUBTREE or SKIP_SIBLINGS then entries in the directory (and any descendants) will not be visited.

Specified by:

preVisitDirectory in interface java.nio.file.FileVisitor<java.nio.file.Path>

Parameters:

dir - a reference to the directory

attrs - the directory's basic attributes

Returns:

the visit result

Throws:

java.io.IOException - if an I/O error occurs

visitFile

public java.nio.file.FileVisitResult visitFile(java.nio.file.Path file,
                                      java.nio.file.attribute.BasicFileAttributes attrs)
                                        throws java.io.IOException

Invoked for a file in a directory.

Specified by:

visitFile in interface java.nio.file.FileVisitor<java.nio.file.Path>

Parameters:

file - a reference to the file

attrs - the file's basic attributes

Returns:

the visit result

Throws:

java.io.IOException - if an I/O error occurs

visitFileFailed

public java.nio.file.FileVisitResult visitFileFailed(java.nio.file.Path file,
                                            java.io.IOException exc)
                                              throws java.io.IOException

Invoked for a file that could not be visited. This method is invoked if the file's attributes could not be read, the file is a directory that could not be opened, and other reasons.

Specified by:

visitFileFailed in interface java.nio.file.FileVisitor<java.nio.file.Path>

Parameters:

file - a reference to the file

exc - the I/O exception that prevented the file from being visited

Returns:

the visit result

Throws:

java.io.IOException - if an I/O error occurs

postVisitDirectory

public java.nio.file.FileVisitResult postVisitDirectory(java.nio.file.Path dir,
                                               java.io.IOException exc)
                                                 throws java.io.IOException

Invoked for a directory after entries in the directory, and all of their descendants, have been visited. This method is also invoked when iteration of the directory completes prematurely (by a visitFile method returning SKIP_SIBLINGS, or an I/O error when iterating over the directory).

Specified by:

postVisitDirectory in interface java.nio.file.FileVisitor<java.nio.file.Path>

Parameters:

dir - a reference to the directory

exc - null if the iteration of the directory completes without an error; otherwise the I/O exception that caused the iteration of the directory to complete prematurely

Returns:

the visit result

Throws:

java.io.IOException - if an I/O error occurs