org.apache.derbyTesting.functionTests.util.streams
Class CharAlphabet

java.lang.Object
  org.apache.derbyTesting.functionTests.util.streams.CharAlphabet

public class CharAlphabet
extends java.lang.Object

A looping alphabet, returning characters. The alphabet loops over a list of characters. The alphabet-object is used by looping readers, which in turn is used for testing methods requiring streaming inputs. The following alphabets have been defined:

• Modern latin, lowercase ; letters a - z (26)
• Norwegian/Danish, lowercase ; letters a - z, plus three additional letters (29)
• Tamil ; 46 Tamil letters from UNICODE U0B80
• CJK subset ; 12 letter from UNICODE CJK U4E00

Field Summary

private int	charCount Number of characters in the alphabet.
private char[]	chars Characters in the alphabet.
static char[]	CJKSUBSET CJK subset; 12 letters, UNICODE U4E00
static char[]	MODERNLATINLOWER Modern latin, lowercase; a - z, 26 letters
private java.lang.String	name Name of the alphabet.
static char[]	NO_DK_LOWER Norwegian/Danish alphabet, lowercase; 29 letters
private int	off Current offset into the alphabet/character array.
static char[]	TAMIL Subset of Tamil alphabet; 46 letters, UNICODE U0B80

Constructor Summary

private

CharAlphabet(java.lang.String name, char[] chars) Create an alphabet with the given name and characters.

Method Summary

int	charCount() Return the number of characters in the alphabet.
static CharAlphabet	cjkSubset() Get a CJK subset alphabet.
java.lang.String	getName() Return the name of the alphabet.
static CharAlphabet	modernLatinLowercase() Get a modern latin lowercase alphabet.
char	nextChar() Return the next char.
int	nextCharAsInt() Return the next char as an integer.
int	nextCharToRead(int charsRead) Compute the next character to read after reading the specified number of characters.
void	reset() Reset the alphabet, the next character returned will be the first character in the alphabet.
static CharAlphabet	tamil() Get a Tamil alphabet

Methods inherited from class java.lang.Object

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

Field Detail

MODERNLATINLOWER

public static char[] MODERNLATINLOWER

Modern latin, lowercase; a - z, 26 letters

NO_DK_LOWER

public static char[] NO_DK_LOWER

Norwegian/Danish alphabet, lowercase; 29 letters

TAMIL

public static char[] TAMIL

Subset of Tamil alphabet; 46 letters, UNICODE U0B80

CJKSUBSET

public static char[] CJKSUBSET

CJK subset; 12 letters, UNICODE U4E00

name

private final java.lang.String name

Name of the alphabet.

chars

private final char[] chars

Characters in the alphabet.

charCount

private final int charCount

Number of characters in the alphabet.

off

private int off

Current offset into the alphabet/character array.

Constructor Detail

CharAlphabet

private CharAlphabet(java.lang.String name,
                     char[] chars)

Create an alphabet with the given name and characters.

Parameters:

name - name of the alphabet

chars - characters in the alphabet.

Method Detail

modernLatinLowercase

public static CharAlphabet modernLatinLowercase()

Get a modern latin lowercase alphabet.

cjkSubset

public static CharAlphabet cjkSubset()

Get a CJK subset alphabet.

tamil

public static CharAlphabet tamil()

Get a Tamil alphabet

getName

public java.lang.String getName()

Return the name of the alphabet.

charCount

public int charCount()

Return the number of characters in the alphabet.

nextCharAsInt

public int nextCharAsInt()

Return the next char as an integer.

Returns:

the next character in the alphabet as an integer

nextChar

public char nextChar()

Return the next char.

Returns:

the next character in the alphabet

nextCharToRead

public int nextCharToRead(int charsRead)

Compute the next character to read after reading the specified number of characters. Besides from returning the index, the internal state of the alphabet is updated.

Parameters:

charsRead - the number of characters read

Returns:

the index of the next character

reset

public void reset()

Reset the alphabet, the next character returned will be the first character in the alphabet.