jpiv2

Class FileHandling

java.lang.Object

jpiv2.FileHandling

public final class FileHandling
extends java.lang.Object

A collection of convenience methods for file handling. All methods are declared 'static', so it is not necessary to create an object to use this methods.

Constructor Summary

Constructors

Constructor and Description
FileHandling()

Method Summary

Modifier and Type	Method and Description
static void	copyFile(java.lang.String source, java.lang.String dest) Copy a file byte by byte.
static java.lang.Object	deSerialize(java.lang.String pathname) Restores an object from a file.
static java.text.DecimalFormat	getCounterFormat(int number) Get a decimal format for integer counters.
static java.lang.String	getFileExtension(java.io.File f) Extracts the file extension from a java.io.File object.
static java.lang.String	getFileExtension(java.lang.String filename) Extracts the file extension from a String object.
static java.lang.String	getFileSeparator() Get the system dependent file separator.
static java.lang.String	getJarDir() Get the absolute path to the directory of this jar-archive.
static double[][]	readArrayFromFile(java.lang.String pathname) Reads whitespace delimited table data from an ascii or unicode file.
static java.lang.String	readTextFile(java.lang.String pathname) Reads a file.
static void	serialize(java.lang.String pathname, java.lang.Object obj) Serializes an object to a file.
static java.lang.String	stripExtension(java.lang.String path) Removes the characters after the last occurence of a "." in path inclusive the ".".
static java.lang.String	stripFilename(java.io.File f) Get the body of a filename.
static java.lang.String	stripFilename(java.lang.String path) Get the body of a filename.
static void	writeArrayToFile(double[][] array, java.lang.String pathname, java.text.DecimalFormat df, java.lang.String header) Writes an array whitespace delimited to a file.
static void	writeArrayToFile(int[] array, java.lang.String pathname, java.text.DecimalFormat df) Writes an array whitespace delimited to a file.
static void	writeTextFile(java.lang.String pathname, java.lang.String s) Writes a file.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileHandling

public FileHandling()

Method Detail

serialize

public static void serialize(java.lang.String pathname,
                             java.lang.Object obj)
                      throws java.io.IOException

Serializes an object to a file.

Parameters:

pathname - Pathname for saving the object.

obj - Any object.

Throws:

java.io.IOException - In case the file can not be written.

deSerialize

public static java.lang.Object deSerialize(java.lang.String pathname)
                                    throws java.io.IOException,
                                           java.io.FileNotFoundException,
                                           java.lang.ClassNotFoundException

Restores an object from a file.

Parameters:

pathname - Pathname of the object.

Returns:

obj Any object.

Throws:

java.io.IOException - In case the file can not be read.

java.io.FileNotFoundException - In case the file could not be found.

java.lang.ClassNotFoundException - In case the object can not be de-serialized. This can happen after updates or when the file was edited elsewhere.

getCounterFormat

public static java.text.DecimalFormat getCounterFormat(int number)

Get a decimal format for integer counters. Constructs a decimal format based on a string that has as many zeros as 'number' has digits. The number 156 for example will lead to a decimal format based on the string '000'. This method is useful if you want to enumerate something with the least number of leading zeros.

Parameters:

number - The maximum value of your enumeration.

Returns:

The number format.

getFileExtension

public static java.lang.String getFileExtension(java.io.File f)

Extracts the file extension from a java.io.File object.

Parameters:

f - The java.io.File object.

Returns:

The file extension or null if there is no extension.

getFileExtension

public static java.lang.String getFileExtension(java.lang.String filename)

Extracts the file extension from a String object.

Parameters:

filename - The java.io.File object.

Returns:

The file extension or null if there is no extension.

stripFilename

public static java.lang.String stripFilename(java.io.File f)

Get the body of a filename.

Parameters:

f - The file.

Returns:

The name of this file without an extension and path.

stripExtension

public static java.lang.String stripExtension(java.lang.String path)

Removes the characters after the last occurence of a "." in path inclusive the ".".

Parameters:

path - A string representing a complete file name inclusive filename extension.

Returns:

The same string with the filename extension removed.

stripFilename

public static java.lang.String stripFilename(java.lang.String path)

Get the body of a filename.

Parameters:

path - The complete filename.

Returns:

The name of this file without an extension and path.

writeArrayToFile

public static void writeArrayToFile(double[][] array,
                                    java.lang.String pathname,
                                    java.text.DecimalFormat df,
                                    java.lang.String header)
                             throws java.io.IOException

Writes an array whitespace delimited to a file.

Parameters:

array - A two dimensional array.

pathname - The full pathname of a destination file.

df - A DecimalFormat for formatting the output.

header - A file header.

Throws:

java.io.IOException - In case the file can not be created.

writeArrayToFile

public static void writeArrayToFile(int[] array,
                                    java.lang.String pathname,
                                    java.text.DecimalFormat df)
                             throws java.io.IOException

Writes an array whitespace delimited to a file.

Parameters:

array - A two dimensional array.

pathname - The full pathname of a destination file.

df - A DecimalFormat for formatting the output.

Throws:

java.io.IOException - in case the file can not be created.

readArrayFromFile

public static double[][] readArrayFromFile(java.lang.String pathname)
                                    throws java.io.IOException

Reads whitespace delimited table data from an ascii or unicode file. This method ignores header lines that contain Tecplot keywords. There is a limit of 25 columns.

Parameters:

pathname - The absolute path of a file containing a whitespace delimited table.

Returns:

A two dimensional double array containing the data of the table.

Throws:

java.io.IOException - in case no file can be created from pathname

readTextFile

public static java.lang.String readTextFile(java.lang.String pathname)

Reads a file.

Parameters:

pathname - The absolute pathname of the file.

Returns:

The UTF-8 encoded file content or null in case of an exception.

writeTextFile

public static void writeTextFile(java.lang.String pathname,
                                 java.lang.String s)
                          throws java.io.IOException

Writes a file.

Parameters:

pathname - The absolute pathname of the file.

s - The string to be written.

Throws:

java.io.IOException - In case the file can not be written.

copyFile

public static void copyFile(java.lang.String source,
                            java.lang.String dest)

Copy a file byte by byte.

Parameters:

source - Complete path of the source file.

dest - Complete path of the destination file.

getFileSeparator

public static java.lang.String getFileSeparator()

Get the system dependent file separator.

Returns:

The file separator.

getJarDir

public static java.lang.String getJarDir()

Get the absolute path to the directory of this jar-archive.

Returns:

The pathname.