Package es.urjc.etsii.grafo.util

Class StringUtil

java.lang.Object

es.urjc.etsii.grafo.util.StringUtil

public class StringUtil
extends Object

String Utils

Constructor Summary

Constructors

Constructor	Description
StringUtil()

Method Summary

Modifier and Type	Method	Description
static String	b64decode(String s)	Base 64 decode a string.
static String	b64decode(String s, Charset charset)	Base 64 decode a string
static String	b64encode(byte[] bytes)	Base 64 encode a byte array
static String	b64encode(String s)	Base 64 encode a string.
static String	b64encode(String s, Charset charset)	Base 64 encode a string
static String	generateSecret()	Generate secret using a SecureRandom.
static String	generateSecret(int size)	Generate secret using a SecureRandom
static int	levenshtein(int[] lhs, int[] rhs)	Calculate the minimum number of operations required to transform one array into another.
static int	levenshtein(int[] lhs, int limitlhs, int[] rhs, int limitrhs)	Calculate the minimum number of operations required to transform one array into another.
static int	levenshtein(CharSequence lhs, CharSequence rhs)	Calculate the minimum number of operations required to transform one string into another.
static String	longestCommonPrefix(String[] data)	Find the longest common prefix given a list of strings.
static String	longestCommonSuffix(String[] data)	Find the longest common suffix given a list of strings.
static String	randomAlgorithmName()
static String	reverse(String s)	Reverse string, ie, "abc" becomes "cba"

Methods inherited from class java.lang.Object

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

Constructor Details

StringUtil

public StringUtil()

Method Details

b64decode

public static String b64decode(String s)

Base 64 decode a string. Uses UTF-8

Parameters:

s - String to decode

Returns:

decoded string

b64decode

public static String b64decode(String s,
 Charset charset)

Base 64 decode a string

Parameters:

s - String to decode

charset - Charset to use

Returns:

decoded string

b64encode

public static String b64encode(String s)

Base 64 encode a string. Uses UTF-8

Parameters:

s - String to encode

Returns:

encoded string

b64encode

public static String b64encode(String s,
 Charset charset)

Base 64 encode a string

Parameters:

s - String to encode

charset - Charset to use

Returns:

encoded string

b64encode

public static String b64encode(byte[] bytes)

Base 64 encode a byte array

Parameters:

bytes - bytes to encode

Returns:

encoded string

generateSecret

public static String generateSecret(int size)

Generate secret using a SecureRandom

Parameters:

size - size in bytes.

Returns:

Base64 encoded secret.

generateSecret

public static String generateSecret()

Generate secret using a SecureRandom. Size defaults to 16 bytes.

Returns:

Base64 encoded secret.

randomAlgorithmName

public static String randomAlgorithmName()

levenshtein

public static int levenshtein(CharSequence lhs,
 CharSequence rhs)

Calculate the minimum number of operations required to transform one string into another. In Levenshtein distance, valid operations are insert, remove and swap/replace. Adapted from: Wikibooks

Parameters:

lhs - first string

rhs - second string

Returns:

minimum number of operations required to transform the first string into the second.

levenshtein

public static int levenshtein(int[] lhs,
 int[] rhs)

Calculate the minimum number of operations required to transform one array into another. In Levenshtein distance, valid operations are insert, remove and swap/replace. Adapted from: Wikibooks

Parameters:

lhs - first string

rhs - second string

Returns:

minimum number of operations required to transform the first string into the second.

levenshtein

public static int levenshtein(int[] lhs,
 int limitlhs,
 int[] rhs,
 int limitrhs)

Calculate the minimum number of operations required to transform one array into another. In Levenshtein distance, valid operations are insert, remove and swap/replace. Adapted from: Wikibooks

Parameters:

lhs - first string

rhs - second string

Returns:

minimum number of operations required to transform the first string into the second.

longestCommonPrefix

public static String longestCommonPrefix(String[] data)

Find the longest common prefix given a list of strings. WARNING: The method will sort the array given as an argument, modifying it. Clone it before calling this method if this behaviour is not desired.

Parameters:

data - Array of strings used to calculate common prefix

Returns:

Longest common prefix for all strings given as argument

longestCommonSuffix

public static String longestCommonSuffix(String[] data)

Find the longest common suffix given a list of strings.

Parameters:

data - Array of strings used to calculate common prefix

Returns:

Longest common prefix for all strings given as argument

reverse

public static String reverse(String s)

Reverse string, ie, "abc" becomes "cba"

Parameters:

s - string to reverse

Returns:

reversed string