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## org.apache.fop.util
Class CharUtilities

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

    public class CharUtilities

extends java.lang.Object

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

Field Summary
`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
`protected` | `CharUtilities()` Utility class: Constructor prevents instantiating when subclassed.

Method Summary
`static java.lang.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 java.lang.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 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` | `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(java.lang.CharSequence cs1, java.lang.CharSequence cs2)` Determine if two character sequences contain the same characters.
`static boolean` | `isZeroWidthSpace(int c)` Method to determine if the character is a zero-width space.
`static java.lang.String` | `padLeft(java.lang.String s, int width, char pad)` Pad a string S on left out to width W using padding character PAD.
`static java.lang.String` | `toNCRefs(java.lang.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 java.lang.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 java.lang.String toNCRefs(java.lang.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 java.lang.String padLeft(java.lang.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 java.lang.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(java.lang.CharSequence cs1,
                                         java.lang.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

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