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

    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());
  }


  public void testCreateLineBidi() {
    bd = new Bidi("a\u05D0a\na\u05D0\"\u05D0a".toCharArray(), 0,
        new byte[] { 0, 0, 0, -3, -3, 2, 2, 0, 3 }, 0, 9,
        Bidi.DIRECTION_RIGHT_TO_LEFT);
    Bidi line = bd.createLineBidi(2, 7);
    assertFalse(line.baseIsLeftToRight());
    assertEquals(1, line.getBaseLevel());
    assertEquals(5, line.getLength());
    assertEquals(2, line.getLevelAt(0));
    assertEquals(1, line.getLevelAt(1));
    assertEquals(3, line.getLevelAt(2));
    assertEquals(3, line.getLevelAt(3));
    assertEquals(2, line.getLevelAt(4));
    assertEquals(1, line.getLevelAt(1000));
    assertEquals(4, line.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 2 }, { 1, 2, 1 },
        { 2, 4, 3 }, { 4, 5, 2 }, }, line);
    assertFalse(line.isLeftToRight());
    assertTrue(line.isMixed());
    assertFalse(line.isRightToLeft());
  }

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    harness.check(buf.toString(), expected);
  }


  public void test(TestHarness harness)
  {
    Bidi b;


    harness.checkPoint("simple");
    b = new Bidi("hi bob", Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    testOne(harness, b, "000000");
    harness.check(b.baseIsLeftToRight());
    harness.check(b.isLeftToRight());
    harness.check(b.getRunCount(), 1);


    harness.checkPoint("one embedding");
    b = new Bidi("hi \u202bbob", Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    testOne(harness, b, "0002222");


    harness.checkPoint("override");
    b = new Bidi("hi \u202ebob", Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    testOne(harness, b, "0001111");


    harness.checkPoint("override and pop");
    b = new Bidi("car means \u202eCAR\u202c.",
        Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    testOne(harness, b, "0000000000111100");
    b = new Bidi("car \u202eMEANS CAR\u202c.",
          Bidi.DIRECTION_RIGHT_TO_LEFT);
    testOne(harness, b, "2221333333333311");
  }

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        try {
            content.getChars(parStart, parLen, text);
        } catch (final BadLocationException e) { }


        Bidi bidi = new Bidi(text.array, text.offset, null, 0, text.count,
                             getDefaultDirection(par));


        final int runCount = bidi.getRunCount();
        for (int i = 0; i < runCount; i++) {
            int level = bidi.getRunLevel(i);


            if (i == 0 && added.size() > 0) {
                Element prevBidi = (Element)added.get(added.size() - 1);
                if (getBidiLevel(prevBidi) == level) {
                    added.remove(added.size() - 1);
                    added.add(new BidiElement(prevBidi.getAttributes(),
                                              prevBidi.getStartOffset(),
                                              parStart + bidi.getRunLimit(i)));
                    continue;
                }
            }


            added.add(
                new BidiElement(context.addAttribute(context.getEmptySet(),
                                                     StyleConstants.BidiLevel,
                                                     new Integer(level)),
                                parStart + bidi.getRunStart(i),
                                parStart + bidi.getRunLimit(i)));
        }


    }

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                                  text.offset + text.count)) {


            return false;
        }


        final Bidi bidi = new Bidi(text.array, text.offset, null, 0, text.count,
                                   getDefaultDirection(offset));


        if (hasBidiInfo && !bidi.isMixed()
            && isLeftToRight(offset) == bidi.isLeftToRight()) {


            return false;
        }


        if (!hasBidiInfo) {

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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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                                              boolean isDirectionLTR,
                                              float[] baselineOffsets) {


        factory.setLineContext(0, chars.length);


        Bidi lineBidi = factory.getLineBidi();
        int[] charsLtoV = null;
        byte[] levels = null;


        if (lineBidi != null) {
            levels = BidiUtils.getLevels(lineBidi);

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                                                  AttributedCharacterIterator text,
                                                  char[] chars,
                                                  float[] baselineOffsets) {


        StyledParagraph styledParagraph = new StyledParagraph(text, chars);
        Bidi bidi = new Bidi(text);
        if (bidi.isLeftToRight()) {
            bidi = null;
        }
        int layoutFlags = 0; // no extra info yet, bidi determines run and line direction
        TextLabelFactory factory = new TextLabelFactory(frc, chars, bidi, layoutFlags);


        boolean isDirectionLTR = true;
        if (bidi != null) {
            isDirectionLTR = bidi.baseIsLeftToRight();
        }
        return createLineFromText(chars, styledParagraph, factory, isDirectionLTR, baselineOffsets);
    }

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      labelSize = 0;


      if (bidiRequired)
      {
        Bidi bidi = new Bidi(label,
            Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);


        int runCount = bidi.getRunCount();


        if (rtlGlyphVectors == null
            || rtlGlyphVectors.length != runCount)
        {
          rtlGlyphVectors = new GlyphVector[runCount];
        }


        for (int i = 0; i < bidi.getRunCount(); i++)
        {
          final String labelSection = label.substring(
              bidi.getRunStart(i), bidi.getRunLimit(i));
          rtlGlyphVectors[i] = font
              .layoutGlyphVector(mxCurveLabelShape.frc,
                  labelSection.toCharArray(), 0,
                  labelSection.length(),
                  Font.LAYOUT_RIGHT_TO_LEFT);

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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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