de.binfalse.bfutils

Class GeneralTools

java.lang.Object

de.binfalse.bfutils.GeneralTools

public class GeneralTools
extends Object

Author:

martin

Constructor Summary

Constructors

Constructor and Description
GeneralTools()

Method Summary

Modifier and Type	Method and Description
static String	byteToHex(byte[] data) Byte to hex.
static int	computeLevenshteinDistance(String str1, String str2) Compute levenshtein distance of two strings.
static byte[]	decodeBase64(String str) Decode a base64 string.
static boolean	delete(File f) Recursively delete file or directory.
static String	encodeBase64(byte[] bytes) Encode some byte in base64.
static String	fileToString(File f) Read a file and return its contents as a string.
static String	hash(String msg) Hash a message using either sha256/sha1/sha512/md5, whatever is available.
static String	hashMd5(String msg) Hash a message using MD5.
static String	hashSha1(String msg) Hash a message using SHA1.
static String	hashSha256(String msg) Hash a message using SHA256.
static String	hashSha512(String msg) Hash a message using SHA512.
static int	minimum(int a, int b, int c) Get the minimum of 3 values.
static String	prettyDouble(Double d, Integer neglect) Beautify the display of a double d.
static String	prettyDouble(Double d, Integer neglect, String pre, String post) Beautify the display of a double d.
static String	repeat(String s, int times) Repeat a string.
static int	sizeOfIterable(Iterable<?> iterable) Calculate the size of iterable object.
static void	stringToFile(String s, File f) Write a string to a file.

Methods inherited from class java.lang.Object

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

Constructor Detail

GeneralTools

public GeneralTools()

Method Detail

minimum

public static int minimum(int a,
                          int b,
                          int c)

Get the minimum of 3 values.

Parameters:

a - the a

b - the b

c - the c

Returns:

the min

computeLevenshteinDistance

public static int computeLevenshteinDistance(String str1,
                                             String str2)

Compute levenshtein distance of two strings.

Parameters:

str1 - the str1

str2 - the str2

Returns:

the distance

repeat

public static String repeat(String s,
                            int times)

Repeat a string.

Parameters:

s - the string

times - the number of times to repeat s

Returns:

the string

prettyDouble

public static String prettyDouble(Double d,
                                  Integer neglect)

Beautify the display of a double d. If the double is an int we'll omit the .0. Additionally you may define an int to neglect (e.g. 0 or 1), thus, if d == neglect you'll get an empty string. Especially designed to display equations and stuff (e.g. omit an multiplier of 1 or an offset of 0).

Parameters:

d - the double to print

neglect - an integer to neglect. Can be null if you don't want to omit any number

Returns:

the pretty string

prettyDouble

public static String prettyDouble(Double d,
                                  Integer neglect,
                                  String pre,
                                  String post)

Beautify the display of a double d. If the double is an int we'll omit the .0. Additionally you may define an int to neglect (e.g. 0 or 1), thus, if d == neglect you'll get an empty string. Especially designed to display equations and stuff (e.g. omit an multiplier of 1 or an offset of 0). You can also define a pre- and post-word to be put before or after, respectively. That means, if d == neglect we will return "", otherwise pre + pretty (d) + post.

Parameters:

d - the double to print

neglect - an integer to neglect. Can be null if you don't want to omit any number

pre - the string to put in front of d, if d != neglect

post - the string to put after d, if d != neglect

Returns:

the pretty string

byteToHex

public static String byteToHex(byte[] data)

Byte to hex.

Parameters:

data - the data

Returns:

the string

hash

public static String hash(String msg)

Hash a message using either sha256/sha1/sha512/md5, whatever is available.

Parameters:

msg - the message

Returns:

the hash or null if we're not able to produce the hash

hashMd5

public static String hashMd5(String msg)

Hash a message using MD5.

Parameters:

msg - the message

Returns:

the hash or null if we're not able to produce the hash

hashSha1

public static String hashSha1(String msg)

Hash a message using SHA1.

Parameters:

msg - the message

Returns:

the hash or null if we're not able to produce the hash

hashSha256

public static String hashSha256(String msg)

Hash a message using SHA256.

Parameters:

msg - the message

Returns:

the hash or null if we're not able to produce the hash

hashSha512

public static String hashSha512(String msg)

Hash a message using SHA512.

Parameters:

msg - the message

Returns:

the hash or null if we're not able to produce the hash

encodeBase64

public static String encodeBase64(byte[] bytes)

Encode some byte in base64.

Parameters:

bytes - the bytes

Returns:

the base64 encoded string

decodeBase64

public static byte[] decodeBase64(String str)

Decode a base64 string.

Parameters:

str - the string encoded in base64

Returns:

the bytes

fileToString

public static String fileToString(File f)
                           throws IOException

Read a file and return its contents as a string.

Parameters:

f - the file

Returns:

the string

Throws:

IOException

stringToFile

public static void stringToFile(String s,
                                File f)
                         throws IOException

Write a string to a file.

Parameters:

s - the string

f - the file

Throws:

IOException - Signals that an I/O exception has occurred.

sizeOfIterable

public static int sizeOfIterable(Iterable<?> iterable)

Calculate the size of iterable object.

Parameters:

iterable - the iterable

Returns:

the its size

delete

public static boolean delete(File f)
                      throws IOException

Recursively delete file or directory. This function was cheekily stolen from the CombineArchive Toolkit, see original version

Parameters:

f - the file/dir to delete

Returns:

true, if successful

Throws:

IOException - Signals that an I/O exception has occurred.