Examples of java.text.Bidi

java.text.Bidi
This class implements the Unicode Bidirectional Algorithm.
A Bidi object provides information on the bidirectional reordering of the text used to create it. This is required, for example, to properly display Arabic or Hebrew text. These languages are inherently mixed directional, as they order numbers from left-to-right while ordering most other text from right-to-left.
Once created, a Bidi object can be queried to see if the text it represents is all left-to-right or all right-to-left. Such objects are very lightweight and this text is relatively easy to process.
If there are multiple runs of text, information about the runs can be accessed by indexing to get the start, limit, and level of a run. The level represents both the direction and the 'nesting level' of a directional run. Odd levels are right-to-left, while even levels are left-to-right. So for example level 0 represents left-to-right text, while level 1 represents right-to-left text, and level 2 represents left-to-right text embedded in a right-to-left run. @since 1.4

        fChars = newChars;


        if (fBidi != null || Bidi.requiresBidi(newChars, newCharIndex, newCharIndex + 1) ||
                newParagraph.getAttribute(TextAttribute.BIDI_EMBEDDING) != null) {


            fBidi = new Bidi(newParagraph);
            if (fBidi.isLeftToRight()) {
                fBidi = null;
            }
        }

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        System.arraycopy(fChars, 0, newChars, 0, deletePos-fStart);
        System.arraycopy(fChars, changedIndex+1, newChars, changedIndex, end-deletePos);
        fChars = newChars;


        if (fBidi != null) {
            fBidi = new Bidi(newParagraph);
            if (fBidi.isLeftToRight()) {
                fBidi = null;
            }
        }

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                getText(pStart, pEnd-pStart, seg);
            } catch (BadLocationException e ) {
                throw new Error("Internal error: " + e.toString());
            }
            // REMIND(bcb) we should really be using a Segment here.
            Bidi bidiAnalyzer;
      int bidiflag = Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT;
      if (direction != null) {
    if (TextAttribute.RUN_DIRECTION_LTR.equals(direction)) {
        bidiflag = Bidi.DIRECTION_LEFT_TO_RIGHT;
    } else {
        bidiflag = Bidi.DIRECTION_RIGHT_TO_LEFT;
    }
      }
      bidiAnalyzer = new Bidi(seg.array, seg.offset, null, 0, seg.count, 
                    bidiflag);
      BidiUtils.getLevels(bidiAnalyzer, levels, levelsEnd);
      levelsEnd += bidiAnalyzer.getLength();


            o =  p.getEndOffset();
            SegmentCache.releaseSharedSegment(seg);
        }

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  }


  private void runTest(String input, String expected) throws PseudolocalizationException {
    String result = runPipeline(pipeline, input);
    assertEquals(expected, result);
    Bidi bidi = new Bidi(result, Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    assertEquals("Non-empty string not detected as RTL via first-strong: " + bidi.toString(),
        input.isEmpty(), bidi.isLeftToRight());
  }

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                getText(pStart, pEnd-pStart, seg);
            } catch (BadLocationException e ) {
                throw new Error("Internal error: " + e.toString());
            }
            // REMIND(bcb) we should really be using a Segment here.
            Bidi bidiAnalyzer;
            int bidiflag = Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT;
            if (direction != null) {
                if (TextAttribute.RUN_DIRECTION_LTR.equals(direction)) {
                    bidiflag = Bidi.DIRECTION_LEFT_TO_RIGHT;
                } else {
                    bidiflag = Bidi.DIRECTION_RIGHT_TO_LEFT;
                }
            }
            bidiAnalyzer = new Bidi(seg.array, seg.offset, null, 0, seg.count,
                    bidiflag);
            BidiUtils.getLevels(bidiAnalyzer, levels, levelsEnd);
            levelsEnd += bidiAnalyzer.getLength();


            o =  p.getEndOffset();
            SegmentCache.releaseSharedSegment(seg);
        }

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            fChars[n++] = c;
        }


        text.first();


        fBidi = new Bidi(text);
        if (fBidi.isLeftToRight()) {
            fBidi = null;
        }


        text.first();

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        int[] charsLtoV = null;
        byte[] charLevels = null;


        if (fBidi != null) {
            Bidi lineBidi = fBidi.createLineBidi(startPos, limitPos);
            charLevels = BidiUtils.getLevels(lineBidi);
            int[] charsVtoL = BidiUtils.createVisualToLogicalMap(charLevels);
            charsLtoV = BidiUtils.createInverseMap(charsVtoL);
        }

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        fChars = newChars;


        if (fBidi != null || Bidi.requiresBidi(newChars, newCharIndex, newCharIndex + 1) ||
                newParagraph.getAttribute(TextAttribute.BIDI_EMBEDDING) != null) {


            fBidi = new Bidi(newParagraph);
            if (fBidi.isLeftToRight()) {
                fBidi = null;
            }
        }

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        System.arraycopy(fChars, 0, newChars, 0, deletePos-fStart);
        System.arraycopy(fChars, changedIndex+1, newChars, changedIndex, end-deletePos);
        fChars = newChars;


        if (fBidi != null) {
            fBidi = new Bidi(newParagraph);
            if (fBidi.isLeftToRight()) {
                fBidi = null;
            }
        }

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                                              Map attributes) {


        boolean isDirectionLTR = true;
        byte[] levels = null;
        int[] charsLtoV = null;
        Bidi bidi = null;
        int characterCount = chars.length;


        boolean requiresBidi = false;
        byte[] embs = null;


        AttributeValues values = null;
        if (attributes != null) {
            values = AttributeValues.fromMap(attributes);
            if (values.getRunDirection() >= 0) {
                isDirectionLTR = values.getRunDirection() == 0;
                requiresBidi = !isDirectionLTR;
            }
            if (values.getBidiEmbedding() != 0) {
                requiresBidi = true;
                byte level = (byte)values.getBidiEmbedding();
                embs = new byte[characterCount];
                for (int i = 0; i < embs.length; ++i) {
                    embs[i] = level;
                }
            }
        }


        // dlf: get baseRot from font for now???


        if (!requiresBidi) {
            requiresBidi = Bidi.requiresBidi(chars, 0, chars.length);
        }


        if (requiresBidi) {
          int bidiflags = values == null
              ? Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT
              : values.getRunDirection();


          bidi = new Bidi(chars, 0, embs, 0, chars.length, bidiflags);
          if (!bidi.isLeftToRight()) {
              levels = BidiUtils.getLevels(bidi);
              int[] charsVtoL = BidiUtils.createVisualToLogicalMap(levels);
              charsLtoV = BidiUtils.createInverseMap(charsVtoL);
              isDirectionLTR = bidi.baseIsLeftToRight();
          }
        }


        Decoration decorator = Decoration.getDecoration(values);

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