Package org.apache.fop.complexscripts.bidi

Class UnicodeBidiAlgorithm

  • All Implemented Interfaces:
    BidiConstants
    public final class UnicodeBidiAlgorithm
extends java.lang.Object
implements BidiConstants

    The UnicodeBidiAlgorithm class implements functionality prescribed by the Unicode Bidirectional Algorithm, Unicode Standard Annex #9.

    This work was originally authored by Glenn Adams (gadams@apache.org).

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static int[] resolveLevels​(int[] chars, int[] classes, int defaultLevel, int[] levels, boolean useRuleL1)
      Resolve the directionality levels of each character in a character seqeunce.
      static int[] resolveLevels​(int[] chars, int defaultLevel, int[] levels)
      Resolve the directionality levels of each character in a character seqeunce.
      static int[] resolveLevels​(java.lang.CharSequence cs, Direction defaultLevel)
      Resolve the directionality levels of each character in a character seqeunce.

      • Methods inherited from class java.lang.Object

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

    • Method Detail

      • resolveLevels

        public static int[] resolveLevels​(java.lang.CharSequence cs,
                                  Direction defaultLevel)
        Resolve the directionality levels of each character in a character seqeunce. If some character is encoded in the character sequence as a Unicode Surrogate Pair, then the directionality level of each of the two members of the pair will be identical.
        Parameters:
        cs - input character sequence representing a UTF-16 encoded string
        defaultLevel - the default paragraph level, which must be zero (LR) or one (RL)
        Returns:
        null if bidirectional processing is not required; otherwise, returns an array of integers, where each integer corresponds to exactly one UTF-16 encoding element present in the input character sequence, and where each integer denotes the directionality level of the corresponding encoding element

      • resolveLevels

        public static int[] resolveLevels​(int[] chars,
                                  int defaultLevel,
                                  int[] levels)
        Resolve the directionality levels of each character in a character seqeunce.
        Parameters:
        chars - array of input characters represented as unicode scalar values
        defaultLevel - the default paragraph level, which must be zero (LR) or one (RL)
        levels - array to receive levels, one for each character in chars array
        Returns:
        null if bidirectional processing is not required; otherwise, returns an array of integers, where each integer corresponds to exactly one UTF-16 encoding element present in the input character sequence, and where each integer denotes the directionality level of the corresponding encoding element

      • resolveLevels

        public static int[] resolveLevels​(int[] chars,
                                  int[] classes,
                                  int defaultLevel,
                                  int[] levels,
                                  boolean useRuleL1)
        Resolve the directionality levels of each character in a character seqeunce.
        Parameters:
        chars - array of input characters represented as unicode scalar values
        classes - array containing one bidi class per character in chars array
        defaultLevel - the default paragraph level, which must be zero (LR) or one (RL)
        levels - array to receive levels, one for each character in chars array
        useRuleL1 - true if rule L1 should be used
        Returns:
        null if bidirectional processing is not required; otherwise, returns an array of integers, where each integer corresponds to exactly one UTF-16 encoding element present in the input character sequence, and where each integer denotes the directionality level of the corresponding encoding element