org.cdlib.xtf.util

Class FileWalker

Object

FileWalker

public abstract class FileWalker
extends Object

The FileWalker class is a utility class that simplifies traversing all the files in a file-system directory, and optionally, in any sub-directories.

To use this class, create a derived class that implements the abstract method processFile() . Then, create an instance of the derived class and call the processFiles() method.

Field Summary

Fields

Modifier and Type	Field and Description
private File	mBasePath Local copy of the path to the base directory to process (as passed into processFiles() .
private boolean	mContinueProcessing Flag indicating whether file processing should continue or stop (set by the value returned from the derived processFile(String, String, String, String) method.)

Constructor Summary

Constructors

Constructor and Description
FileWalker()

Method Summary

Modifier and Type	Method and Description
protected abstract boolean	processFile(String basePath, String subPath, String fileName, String fileExt) File processing function.
private void	processFiles(File theFile, boolean subDirs) Internal recursive directory/file iterating function.
void	processFiles(String baseDir, boolean subDirs) Process all the files in the specified directory, and optionally in all its sub-directories.

Methods inherited from class Object

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

Field Detail

mBasePath

private File mBasePath

Local copy of the path to the base directory to process (as passed into processFiles() .

mContinueProcessing

private boolean mContinueProcessing

Flag indicating whether file processing should continue or stop (set by the value returned from the derived processFile(String, String, String, String) method.)

Constructor Detail

FileWalker

public FileWalker()

Method Detail

processFiles

public void processFiles(String baseDir,
                         boolean subDirs)
                  throws IOException

Process all the files in the specified directory, and optionally in all its sub-directories.

This method calls the derived processFile() to process any files found.

Parameters:

baseDir - The base directory containing files to process.

subDirs - A flag that indicates whether files in sub-directories should also be processed (true) or not (false).

Throws:

IOException

processFile

protected abstract boolean processFile(String basePath,
                                       String subPath,
                                       String fileName,
                                       String fileExt)

File processing function.

This function is called once for every file encountered in the specified base directory. This function is abstract, and requires a derived class to actually implement it.

Parameters:

basePath - The base path under which the current file was found. This path will end in a forward slash (/) character to simplify the construction of a full path/file specification for the current file.

subPath - The sub-path (if any) under which the current file was found. As with the base path, this sub-path will end in a forward slash (/) character to simplify the construction of a full path/file specification for the current file.

fileName - The name of the current file (without the extension).

fileExt - The extension of the current file (if any). If the current file has an extension, then this string will begin with a period (.), to simplify the construction of a full path/file specifiecation for the current file.

Returns:

The derived function should return true if file processing should continue, or false if file processing shouild stop.

processFiles

private void processFiles(File theFile,
                          boolean subDirs)
                   throws IOException

Internal recursive directory/file iterating function.

This function is called recursively when a file encountered is a directory and sub-directory processing is enabled.

Parameters:

theFile - The name of the current file/directory to process.

subDirs - A flag indicating whether or not sub-directories should be processed.

Throws:

IOException

Notes:

This method calls itself recursively if sub-directory processing is enabled with the subDirs parameter. Once an actual file is encountered, this method calls the derived processFile() method to actually perform some work for the file found.