fop 2.1

org.apache.fop.complexscripts.bidi
Class UnicodeBidiAlgorithm

java.lang.Object
  extended by org.apache.fop.complexscripts.bidi.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).


Field Summary
 
Fields inherited from interface org.apache.fop.complexscripts.bidi.BidiConstants
AL, AN, B, BN, CS, EN, ES, ET, FIRST, L, LAST, LRE, LRO, MAX_LEVELS, NSM, ON, OVERRIDE, PDF, R, RLE, RLO, S, SURROGATE, WS
 
Method Summary
static int[] resolveLevels(java.lang.CharSequence cs, Direction defaultLevel)
          Resolve the directionality levels of each character in a character seqeunce.
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.
 
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

fop 2.1

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