CharUtilities (Apache FOP Core 2.4 API)

java.lang.Object
- org.apache.fop.util.CharUtilities

```
public class CharUtilities
extends Object
```
This class provides utilities to distinguish various kinds of Unicode whitespace and to get character widths in a given FontState.

Field Summary

Fields
Modifier and Type	Field and Description
`static char`	`CARRIAGE_RETURN` carriage return
`static char`	`CODE_EOT` Character code used to signal a character boundary in inline content, such as an inline with borders and padding or a nested block object.
`static int`	`EOT` Character class: Boundary between text runs
`static char`	`IDEOGRAPHIC_SPACE` Ideogreaphic space
`static char`	`LINE_SEPARATOR` line-separator
`static int`	`LINEFEED` Character class: Line feed
`static char`	`LINEFEED_CHAR` linefeed character
`static char`	`LRE` left-to-right embedding
`static char`	`LRM` left-to-right mark
`static char`	`LRO` left-to-right override
`static char`	`MISSING_IDEOGRAPH` missing ideograph
`static char`	`NBSPACE` non-breaking space
`static char`	`NEXT_LINE` next line control character
`static int`	`NONWHITESPACE` Character class: non-whitespace
`static char`	`NOT_A_CHARACTER` Unicode value indicating the the character is "not a character".
`static char`	`NULL_CHAR` null char
`static char`	`OBJECT_REPLACEMENT_CHARACTER` Object replacement character
`static char`	`PARAGRAPH_SEPARATOR` paragraph-separator
`static char`	`PDF` pop directional formatting
`static char`	`RLE` right-to-left embedding
`static char`	`RLM` right-to-left mark
`static char`	`RLO` right-to-left override
`static char`	`SOFT_HYPHEN` soft hyphen
`static char`	`SPACE` normal space
`static char`	`TAB` normal tab
`static int`	`UCWHITESPACE` Character class: Unicode white space
`static char`	`WORD_JOINER` word joiner
`static int`	`XMLWHITESPACE` Character class: XML whitespace
`static char`	`ZERO_WIDTH_JOINER` zero-width joiner
`static char`	`ZERO_WIDTH_NOBREAK_SPACE` zero-width no-break space (= byte order mark)
`static char`	`ZERO_WIDTH_SPACE` zero-width space

Constructor Summary

Constructors
Modifier Constructor and Description

protected CharUtilities()
Utility class: Constructor prevents instantiating when subclassed.

Constructors
Modifier	Constructor and Description
`protected`	`CharUtilities()` Utility class: Constructor prevents instantiating when subclassed.

Method Summary

Methods
Modifier and Type	Method and Description
`static String`	`charToNCRef(int c)` Convert a single unicode scalar value to an XML numeric character reference.
`static int`	`classOf(int c)` Return the appropriate CharClass constant for the type of the passed character.
`static Iterable<Integer>`	`codepointsIter(CharSequence s)` Creates an iterator to iter a `CharSequence` codepoints.
`static Iterable<Integer>`	`codepointsIter(CharSequence s, int beginIndex, int endIndex)` Creates an iterator to iter a sub-CharSequence codepoints.
`static boolean`	`containsSurrogatePairAt(CharSequence chars, int index)` Tells whether there is a surrogate pair starting from the given index in the `CharSequence`.
`static String`	`format(int c)` Format character for debugging output, which it is prefixed with "0x", padded left with '0' and either 4 or 6 hex characters in width according to whether it is in the BMP or not.
`static int`	`incrementIfNonBMP(int codePoint)` Returns 1 if codePoint not in the BMP.
`static boolean`	`isAdjustableSpace(int c)` Method to determine if the character is an adjustable space.
`static boolean`	`isAlphabetic(int c)` Indicates whether a character is classified as "Alphabetic" by the Unicode standard.
`static boolean`	`isAnySpace(int c)` Determines if the character represents any kind of space.
`static boolean`	`isBmpCodePoint(int codePoint)` Determine whether the specified character (Unicode code point) is in then Basic Multilingual Plane (BMP).
`static boolean`	`isBreakableSpace(int c)` Helper method to determine if the character is a space with normal behavior.
`static boolean`	`isExplicitBreak(int c)` Indicates whether the given character is an explicit break-character
`static boolean`	`isFixedWidthSpace(int c)` Method to determine if the character is a (breakable) fixed-width space.
`static boolean`	`isNonBreakableSpace(int c)` Method to determine if the character is a nonbreaking space.
`static boolean`	`isSameSequence(CharSequence cs1, CharSequence cs2)` Determine if two character sequences contain the same characters.
`static boolean`	`isSurrogatePair(char ch)` Determine if the given characters is part of a surrogate pair.
`static boolean`	`isZeroWidthSpace(int c)` Method to determine if the character is a zero-width space.
`static String`	`padLeft(String s, int width, char pad)` Pad a string S on left out to width W using padding character PAD.
`static String`	`toNCRefs(String s)` Convert a string to a sequence of ASCII or XML numeric character references.

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

- Field Detail
  - CODE_EOT
```
public static final char CODE_EOT
```
    Character code used to signal a character boundary in inline content, such as an inline with borders and padding or a nested block object.
    
    See Also:
    Constant Field Values
  - UCWHITESPACE
```
public static final int UCWHITESPACE
```
    Character class: Unicode white space
    
    See Also:
    Constant Field Values
  - LINEFEED
```
public static final int LINEFEED
```
    Character class: Line feed
    
    See Also:
    Constant Field Values
  - EOT
```
public static final int EOT
```
    Character class: Boundary between text runs
    
    See Also:
    Constant Field Values
  - NONWHITESPACE
```
public static final int NONWHITESPACE
```
    Character class: non-whitespace
    
    See Also:
    Constant Field Values
  - XMLWHITESPACE
```
public static final int XMLWHITESPACE
```
    Character class: XML whitespace
    
    See Also:
    Constant Field Values
  - NULL_CHAR
```
public static final char NULL_CHAR
```
    null char
    
    See Also:
    Constant Field Values
  - LINEFEED_CHAR
```
public static final char LINEFEED_CHAR
```
    linefeed character
    
    See Also:
    Constant Field Values
  - CARRIAGE_RETURN
```
public static final char CARRIAGE_RETURN
```
    carriage return
    
    See Also:
    Constant Field Values
  - TAB
```
public static final char TAB
```
    normal tab
    
    See Also:
    Constant Field Values
  - SPACE
```
public static final char SPACE
```
    normal space
    
    See Also:
    Constant Field Values
  - NBSPACE
```
public static final char NBSPACE
```
    non-breaking space
    
    See Also:
    Constant Field Values
  - NEXT_LINE
```
public static final char NEXT_LINE
```
    next line control character
    
    See Also:
    Constant Field Values
  - ZERO_WIDTH_SPACE
```
public static final char ZERO_WIDTH_SPACE
```
    zero-width space
    
    See Also:
    Constant Field Values
  - WORD_JOINER
```
public static final char WORD_JOINER
```
    word joiner
    
    See Also:
    Constant Field Values
  - ZERO_WIDTH_JOINER
```
public static final char ZERO_WIDTH_JOINER
```
    zero-width joiner
    
    See Also:
    Constant Field Values
  - LRM
```
public static final char LRM
```
    left-to-right mark
    
    See Also:
    Constant Field Values
  - RLM
```
public static final char RLM
```
    right-to-left mark
    
    See Also:
    Constant Field Values
  - LRE
```
public static final char LRE
```
    left-to-right embedding
    
    See Also:
    Constant Field Values
  - RLE
```
public static final char RLE
```
    right-to-left embedding
    
    See Also:
    Constant Field Values
  - PDF
```
public static final char PDF
```
    pop directional formatting
    
    See Also:
    Constant Field Values
  - LRO
```
public static final char LRO
```
    left-to-right override
    
    See Also:
    Constant Field Values
  - RLO
```
public static final char RLO
```
    right-to-left override
    
    See Also:
    Constant Field Values
  - ZERO_WIDTH_NOBREAK_SPACE
```
public static final char ZERO_WIDTH_NOBREAK_SPACE
```
    zero-width no-break space (= byte order mark)
    
    See Also:
    Constant Field Values
  - SOFT_HYPHEN
```
public static final char SOFT_HYPHEN
```
    soft hyphen
    
    See Also:
    Constant Field Values
  - LINE_SEPARATOR
```
public static final char LINE_SEPARATOR
```
    line-separator
    
    See Also:
    Constant Field Values
  - PARAGRAPH_SEPARATOR
```
public static final char PARAGRAPH_SEPARATOR
```
    paragraph-separator
    
    See Also:
    Constant Field Values
  - MISSING_IDEOGRAPH
```
public static final char MISSING_IDEOGRAPH
```
    missing ideograph
    
    See Also:
    Constant Field Values
  - IDEOGRAPHIC_SPACE
```
public static final char IDEOGRAPHIC_SPACE
```
    Ideogreaphic space
    
    See Also:
    Constant Field Values
  - OBJECT_REPLACEMENT_CHARACTER
```
public static final char OBJECT_REPLACEMENT_CHARACTER
```
    Object replacement character
    
    See Also:
    Constant Field Values
  - NOT_A_CHARACTER
```
public static final char NOT_A_CHARACTER
```
    Unicode value indicating the the character is "not a character".
    
    See Also:
    Constant Field Values
- Constructor Detail
  - CharUtilities
```
protected CharUtilities()
```
    Utility class: Constructor prevents instantiating when subclassed.
- Method Detail
  - classOf
```
public static int classOf(int c)
```
    Return the appropriate CharClass constant for the type of the passed character.
    
    Parameters:
    c - character to inspect
    
    Returns:
    the determined character class
  - isBreakableSpace
```
public static boolean isBreakableSpace(int c)
```
    Helper method to determine if the character is a space with normal behavior. Normal behavior means that it's not non-breaking.
    
    Parameters:
    c - character to inspect
    
    Returns:
    True if the character is a normal space
  - isZeroWidthSpace
```
public static boolean isZeroWidthSpace(int c)
```
    Method to determine if the character is a zero-width space.
    
    Parameters:
    c - the character to check
    
    Returns:
    true if the character is a zero-width space
  - isFixedWidthSpace
```
public static boolean isFixedWidthSpace(int c)
```
    Method to determine if the character is a (breakable) fixed-width space.
    
    Parameters:
    c - the character to check
    
    Returns:
    true if the character has a fixed-width
  - isNonBreakableSpace
```
public static boolean isNonBreakableSpace(int c)
```
    Method to determine if the character is a nonbreaking space.
    
    Parameters:
    c - character to check
    
    Returns:
    True if the character is a nbsp
  - isAdjustableSpace
```
public static boolean isAdjustableSpace(int c)
```
    Method to determine if the character is an adjustable space.
    
    Parameters:
    c - character to check
    
    Returns:
    True if the character is adjustable
  - isAnySpace
```
public static boolean isAnySpace(int c)
```
    Determines if the character represents any kind of space.
    
    Parameters:
    c - character to check
    
    Returns:
    True if the character represents any kind of space
  - isAlphabetic
```
public static boolean isAlphabetic(int c)
```
    Indicates whether a character is classified as "Alphabetic" by the Unicode standard.
    
    Parameters:
    c - the character
    
    Returns:
    true if the character is "Alphabetic"
  - isExplicitBreak
```
public static boolean isExplicitBreak(int c)
```
    Indicates whether the given character is an explicit break-character
    
    Parameters:
    c - the character to check
    
    Returns:
    true if the character represents an explicit break
  - charToNCRef
```
public static String charToNCRef(int c)
```
    Convert a single unicode scalar value to an XML numeric character reference. If in the BMP, four digits are used, otherwise 6 digits are used.
    
    Parameters:
    c - a unicode scalar value
    
    Returns:
    a string representing a numeric character reference
  - toNCRefs
```
public static String toNCRefs(String s)
```
    Convert a string to a sequence of ASCII or XML numeric character references.
    
    Parameters:
    s - a java string (encoded in UTF-16)
    
    Returns:
    a string representing a sequence of numeric character reference or ASCII characters
  - padLeft
```
public static String padLeft(String s,
             int width,
             char pad)
```
    Pad a string S on left out to width W using padding character PAD.
    
    Parameters:
    s - string to pad
    width - width of field to add padding
    pad - character to use for padding
    
    Returns:
    padded string
  - format
```
public static String format(int c)
```
    Format character for debugging output, which it is prefixed with "0x", padded left with '0' and either 4 or 6 hex characters in width according to whether it is in the BMP or not.
    
    Parameters:
    c - character code
    
    Returns:
    formatted character string
  - isSameSequence
```
public static boolean isSameSequence(CharSequence cs1,
                     CharSequence cs2)
```
    Determine if two character sequences contain the same characters.
    
    Parameters:
    cs1 - first character sequence
    cs2 - second character sequence
    
    Returns:
    true if both sequences have same length and same character sequence
  - isBmpCodePoint
```
public static boolean isBmpCodePoint(int codePoint)
```
    Determine whether the specified character (Unicode code point) is in then Basic Multilingual Plane (BMP). Such code points can be represented using a single char.
    
    Parameters:
    codePoint - the character (Unicode code point) to be tested
    
    Returns:
    true if the specified code point is between Character#MIN_VALUE and Character#MAX_VALUE} inclusive; false otherwise
    See Also:
    from Java 1.7
  - incrementIfNonBMP
```
public static int incrementIfNonBMP(int codePoint)
```
    Returns 1 if codePoint not in the BMP. This function is particularly useful in for loops over strings where, in presence of surrogate pairs, you need to skip one loop.
    
    Parameters:
    codePoint - 1 if codePoint > 0xFFFF, 0 otherwise
    
    Returns:
    1 if codePoint > 0xFFFF, 0 otherwise
  - isSurrogatePair
```
public static boolean isSurrogatePair(char ch)
```
    Determine if the given characters is part of a surrogate pair.
    
    Parameters:
    ch - character to be checked
    
    Returns:
    true if ch is an high surrogate or a low surrogate
  - containsSurrogatePairAt
```
public static boolean containsSurrogatePairAt(CharSequence chars,
                              int index)
```
    Tells whether there is a surrogate pair starting from the given index in the CharSequence. If the character at index is an high surrogate then the character at index+1 is checked to be a low surrogate. If a malformed surrogate pair is encountered then an IllegalArgumentException is thrown.
```
 high surrogate [0xD800 - 0xDC00]
 low surrogate [0xDC00 - 0xE000]
 
```
    Parameters:
    chars - CharSequence to check
    index - index in the CharSequqnce where to start the check
    
    Returns:
    true if there is a well-formed surrogate pair at index
    
    Throws:
    
    IllegalArgumentException - if there wrong usage of surrogate pairs
  - codepointsIter
```
public static Iterable<Integer> codepointsIter(CharSequence s)
```
    Creates an iterator to iter a CharSequence codepoints.
    
    Parameters:
    s - CharSequence to iter
    
    Returns:
    codepoint iterator for the given CharSequence.
    See Also:
    codepointsIter(CharSequence, int, int)
  - codepointsIter
```
public static Iterable<Integer> codepointsIter(CharSequence s,
                               int beginIndex,
                               int endIndex)
```
    Creates an iterator to iter a sub-CharSequence codepoints.
    
    Parameters:
    s - CharSequence to iter
    beginIndex - lower range
    endIndex - upper range
    
    Returns:
    codepoint iterator for the given sub-CharSequence.
    See Also:
    Bug JDK-5003547

Class CharUtilities

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

CODE_EOT

UCWHITESPACE

LINEFEED

EOT

NONWHITESPACE

XMLWHITESPACE

NULL_CHAR

LINEFEED_CHAR

CARRIAGE_RETURN

TAB

SPACE

NBSPACE

NEXT_LINE

ZERO_WIDTH_SPACE

WORD_JOINER

ZERO_WIDTH_JOINER

LRM

RLM

LRE

RLE

PDF

LRO

RLO

ZERO_WIDTH_NOBREAK_SPACE

SOFT_HYPHEN

LINE_SEPARATOR

PARAGRAPH_SEPARATOR

MISSING_IDEOGRAPH

IDEOGRAPHIC_SPACE

OBJECT_REPLACEMENT_CHARACTER

NOT_A_CHARACTER

Constructor Detail

CharUtilities

Method Detail

classOf

isBreakableSpace

isZeroWidthSpace

isFixedWidthSpace

isNonBreakableSpace

isAdjustableSpace

isAnySpace

isAlphabetic

isExplicitBreak

charToNCRef

toNCRefs

padLeft

format

isSameSequence

isBmpCodePoint

incrementIfNonBMP

isSurrogatePair

containsSurrogatePairAt

codepointsIter

codepointsIter