java.lang.Object
- org.marketcetera.util.misc.RandomStrings

```
public final class RandomStrings
extends Object
```
Utilities for random string generation. All random distributions are uniform.

Since:

0.6.0

Version:

$Id: RandomStrings.java 16154 2012-07-14 16:34:05Z colin $

Author:

tlerios@marketcetera.com

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`DEFAULT_LEN_STR_ALNUM`	The default maximum length of a randomly generated string whose characters are all Unicode code points that are letters or digits; the minimum length is 1.
`static int`	`DEFAULT_LEN_STR_CHARSET`	The default maximum length of a randomly generated string whose characters are all Unicode code points that can be encoded by some charset (supplied or implied); the minimum length is 1.
`static int`	`DEFAULT_LEN_STR_DIGIT`	The default maximum length of a randomly generated string whose characters are all Unicode code points that are digits; the minimum length is 1.
`static int`	`DEFAULT_LEN_STR_ID`	The default maximum length of a randomly generated string whose characters are all Unicode code points; in addition, the first character is always a letter, the second is always a digit, and the rest (if any) are either letters or digits; the minimum length is 2.
`static int`	`DEFAULT_LEN_STR_LETTER`	The default maximum length of a randomly generated string whose characters are all Unicode code points that are letters; the minimum length is 1.
`static int`	`DEFAULT_LEN_STR_VALID`	The default maximum length of a randomly generated string whose characters are all Unicode code points that are deemed valid by `StringUtils.isValid(int)`; the minimum length is 1.
`private static Random`	`sGenerator`

Constructor Summary

Constructors
Modifier Constructor Description

private RandomStrings()
Constructor.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static String`	`genStr(UCPFilter filter, int len)`	Returns a generated string of the given length whose characters are all Unicode code points that meet the constraints of the given filter.
`static String`	`genStrAlNum()`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_ALNUM`) whose characters are all Unicode code points that are letters or digits.
`static String`	`genStrAlNum(int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points that are letters or digits.
`static String`	`genStrCharset(Charset cs)`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_CHARSET`) whose characters are all Unicode code points that can be encoded by the given charset.
`static String`	`genStrCharset(Charset cs, int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points that can be encoded by the given charset.
`static String`	`genStrDefCharset()`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_CHARSET`) whose characters are all Unicode code points that can be encoded by the default JVM charset.
`static String`	`genStrDefCharset(int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points that can be encoded by the default JVM charset.
`static String`	`genStrDigit()`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_DIGIT`) whose characters are all Unicode code points that are digits.
`static String`	`genStrDigit(int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points that are digits.
`static String`	`genStrFileSystem()`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_CHARSET`) whose characters are all Unicode code points that can be encoded by the current system file encoding/charset (as specified in the system property `file.encoding`).
`static String`	`genStrFileSystem(int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points that can be encoded by the current system file encoding/charset (as specified in the system property `file.encoding`).
`static String`	`genStrId()`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_ID`) whose characters are all Unicode code points; in addition, the first character is always a letter, the second is always a digit, and the rest (if any) are either letters or digits.
`static String`	`genStrId(int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points; in addition, the first character (if any) is always a letter, the second (if any) is always a digit, and the rest (if any) are either letters or digits.
`static String`	`genStrLetter()`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_LETTER`) whose characters are all Unicode code points that are letters.
`static String`	`genStrLetter(int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points that are letters.
`static String`	`genStrValid()`	Returns a randomly generated string of random length (bound by `DEFAULT_LEN_STR_VALID`) whose characters are all Unicode code points that are deemed valid by `StringUtils.isValid(int)`.
`static String`	`genStrValid(int len)`	Returns a randomly generated string of the given length whose characters are all Unicode code points that are deemed valid by `StringUtils.isValid(int)`.
`static int`	`genUCP()`	Returns a randomly generated Unicode code point within the full range of valid Unicode scalar values.
`static int`	`genUCP(UCPFilter filter)`	Returns a randomly generated Unicode code point that meets the constraints of the given filter.
`static int`	`genUCPAlNum()`	Returns a randomly generated Unicode code point that is either a letter or a digit.
`static int`	`genUCPCharset(Charset cs)`	Returns a randomly generated Unicode code point that can be encoded by the given charset.
`static int`	`genUCPDefCharset()`	Returns a randomly generated Unicode code point that can be encoded by the default JVM charset.
`static int`	`genUCPDigit()`	Returns a randomly generated Unicode code point that is a digit.
`static int`	`genUCPFileSystem()`	Returns a randomly generated Unicode code point that can be encoded by the current system file encoding/charset (as specified in the system property `file.encoding`).
`static int`	`genUCPLetter()`	Returns a randomly generated Unicode code point that is a letter.
`static int`	`genUCPValid()`	Returns a randomly generated Unicode code point that is deemed valid by `StringUtils.isValid(int)`.
`static void`	`resetGeneratorFixed()`	Resets the random number generator used by this class to a fixed seed value, which henceforth results in a repeatable, deterministic sequence of random code points and strings.
`static long`	`resetGeneratorRandom()`	Resets the random number generator used by this class to a random seed value, and returns that value.
`static void`	`resetGeneratorRandom(long seed)`	Resets the random number generator used by this class to the given seed value, which henceforth results in a repeatable, deterministic sequence of random code points and strings.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_LEN_STR_CHARSET
```
public static final int DEFAULT_LEN_STR_CHARSET
```
    The default maximum length of a randomly generated string whose characters are all Unicode code points that can be encoded by some charset (supplied or implied); the minimum length is 1.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_LEN_STR_VALID
```
public static final int DEFAULT_LEN_STR_VALID
```
    The default maximum length of a randomly generated string whose characters are all Unicode code points that are deemed valid by StringUtils.isValid(int); the minimum length is 1.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_LEN_STR_DIGIT
```
public static final int DEFAULT_LEN_STR_DIGIT
```
    The default maximum length of a randomly generated string whose characters are all Unicode code points that are digits; the minimum length is 1.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_LEN_STR_LETTER
```
public static final int DEFAULT_LEN_STR_LETTER
```
    The default maximum length of a randomly generated string whose characters are all Unicode code points that are letters; the minimum length is 1.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_LEN_STR_ALNUM
```
public static final int DEFAULT_LEN_STR_ALNUM
```
    The default maximum length of a randomly generated string whose characters are all Unicode code points that are letters or digits; the minimum length is 1.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_LEN_STR_ID
```
public static final int DEFAULT_LEN_STR_ID
```
    The default maximum length of a randomly generated string whose characters are all Unicode code points; in addition, the first character is always a letter, the second is always a digit, and the rest (if any) are either letters or digits; the minimum length is 2.
    
    See Also:
    
    Constant Field Values
  - sGenerator
```
private static Random sGenerator
```
- Constructor Detail
  - RandomStrings
```
private RandomStrings()
```
    Constructor. It is private so that no instances can be created.
- Method Detail
  - resetGeneratorRandom
```
public static void resetGeneratorRandom(long seed)
```
    Resets the random number generator used by this class to the given seed value, which henceforth results in a repeatable, deterministic sequence of random code points and strings.
    
    Parameters:
    
    seed - The seed.
  - resetGeneratorRandom
```
public static long resetGeneratorRandom()
```
    Resets the random number generator used by this class to a random seed value, and returns that value.
    
    Returns:
    
    The seed.
  - resetGeneratorFixed
```
public static void resetGeneratorFixed()
```
    Resets the random number generator used by this class to a fixed seed value, which henceforth results in a repeatable, deterministic sequence of random code points and strings.
  - genUCP
```
public static int genUCP()
```
    Returns a randomly generated Unicode code point within the full range of valid Unicode scalar values.
    
    Returns:
    
    The code point.
  - genUCP
```
public static int genUCP(UCPFilter filter)
```
    Returns a randomly generated Unicode code point that meets the constraints of the given filter.
    
    Parameters:
    
    filter - The filter.
    
    Returns:
    
    The code point.
  - genUCPCharset
```
public static int genUCPCharset(Charset cs)
```
    Returns a randomly generated Unicode code point that can be encoded by the given charset.
    
    Parameters:
    
    cs - The charset.
    
    Returns:
    
    The code point.
  - genUCPDefCharset
```
public static int genUCPDefCharset()
```
    Returns a randomly generated Unicode code point that can be encoded by the default JVM charset.
    
    Returns:
    
    The code point.
  - genUCPFileSystem
```
public static int genUCPFileSystem()
```
    Returns a randomly generated Unicode code point that can be encoded by the current system file encoding/charset (as specified in the system property file.encoding).
    
    Returns:
    
    The code point.
  - genUCPValid
```
public static int genUCPValid()
```
    Returns a randomly generated Unicode code point that is deemed valid by StringUtils.isValid(int).
    
    Returns:
    
    The code point.
  - genUCPDigit
```
public static int genUCPDigit()
```
    Returns a randomly generated Unicode code point that is a digit.
    
    Returns:
    
    The code point.
  - genUCPLetter
```
public static int genUCPLetter()
```
    Returns a randomly generated Unicode code point that is a letter.
    
    Returns:
    
    The code point.
  - genUCPAlNum
```
public static int genUCPAlNum()
```
    Returns a randomly generated Unicode code point that is either a letter or a digit.
    
    Returns:
    
    The code point.
  - genStr
```
public static String genStr(UCPFilter filter,
                            int len)
```
    Returns a generated string of the given length whose characters are all Unicode code points that meet the constraints of the given filter.
    
    Parameters:
    
    filter - The filter.
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrCharset
```
public static String genStrCharset(Charset cs,
                                   int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points that can be encoded by the given charset.
    
    Parameters:
    
    cs - The charset.
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrDefCharset
```
public static String genStrDefCharset(int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points that can be encoded by the default JVM charset.
    
    Parameters:
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrFileSystem
```
public static String genStrFileSystem(int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points that can be encoded by the current system file encoding/charset (as specified in the system property file.encoding).
    
    Parameters:
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrValid
```
public static String genStrValid(int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points that are deemed valid by StringUtils.isValid(int).
    
    Parameters:
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrDigit
```
public static String genStrDigit(int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points that are digits.
    
    Parameters:
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrLetter
```
public static String genStrLetter(int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points that are letters.
    
    Parameters:
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrAlNum
```
public static String genStrAlNum(int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points that are letters or digits.
    
    Parameters:
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrId
```
public static String genStrId(int len)
```
    Returns a randomly generated string of the given length whose characters are all Unicode code points; in addition, the first character (if any) is always a letter, the second (if any) is always a digit, and the rest (if any) are either letters or digits.
    
    Parameters:
    
    len - The length (in code points).
    
    Returns:
    
    The string.
  - genStrCharset
```
public static String genStrCharset(Charset cs)
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_CHARSET) whose characters are all Unicode code points that can be encoded by the given charset.
    
    Parameters:
    
    cs - The charset.
    
    Returns:
    
    The string.
  - genStrDefCharset
```
public static String genStrDefCharset()
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_CHARSET) whose characters are all Unicode code points that can be encoded by the default JVM charset.
    
    Returns:
    
    The string.
  - genStrFileSystem
```
public static String genStrFileSystem()
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_CHARSET) whose characters are all Unicode code points that can be encoded by the current system file encoding/charset (as specified in the system property file.encoding).
    
    Returns:
    
    The string.
  - genStrValid
```
public static String genStrValid()
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_VALID) whose characters are all Unicode code points that are deemed valid by StringUtils.isValid(int).
    
    Returns:
    
    The string.
  - genStrDigit
```
public static String genStrDigit()
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_DIGIT) whose characters are all Unicode code points that are digits.
    
    Returns:
    
    The string.
  - genStrLetter
```
public static String genStrLetter()
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_LETTER) whose characters are all Unicode code points that are letters.
    
    Returns:
    
    The string.
  - genStrAlNum
```
public static String genStrAlNum()
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_ALNUM) whose characters are all Unicode code points that are letters or digits.
    
    Returns:
    
    The string.
  - genStrId
```
public static String genStrId()
```
    Returns a randomly generated string of random length (bound by DEFAULT_LEN_STR_ID) whose characters are all Unicode code points; in addition, the first character is always a letter, the second is always a digit, and the rest (if any) are either letters or digits.
    
    Returns:
    
    The string.

Class RandomStrings

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_LEN_STR_CHARSET

DEFAULT_LEN_STR_VALID

DEFAULT_LEN_STR_DIGIT

DEFAULT_LEN_STR_LETTER

DEFAULT_LEN_STR_ALNUM

DEFAULT_LEN_STR_ID

sGenerator

Constructor Detail

RandomStrings

Method Detail

resetGeneratorRandom

resetGeneratorRandom

resetGeneratorFixed

genUCP

genUCP

genUCPCharset

genUCPDefCharset

genUCPFileSystem

genUCPValid

genUCPDigit

genUCPLetter

genUCPAlNum

genStr

genStrCharset

genStrDefCharset

genStrFileSystem

genStrValid

genStrDigit

genStrLetter

genStrAlNum

genStrId

genStrCharset

genStrDefCharset

genStrFileSystem

genStrValid

genStrDigit

genStrLetter

genStrAlNum

genStrId