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[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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                                              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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    assertFalse(line.isRightToLeft());
  }


    public void testCreateLineBidiInvalid() {
        //regression for HARMONY-1050
        Bidi bidi = new Bidi("str", 1);
        try {
            bidi.createLineBidi(-1, 1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }
        
        try {
            bidi.createLineBidi(1, -1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }
        
        try {
            bidi.createLineBidi(-1, -1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }


        try {
            bidi.createLineBidi(2, 1);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }
        
        bidi.createLineBidi(2, 2);


        try {
            bidi.createLineBidi(2, 4);
            fail("Expected IAE");           
        } catch (IllegalArgumentException e) {
            // Expected
        }
    }

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        }
    }
    
  public void testIncompatibleLineAlgorithm() {
    // ICU treat a new line as in the same run, however RI does not
    bd = new Bidi("aaaaa".toCharArray(), 0,
        new byte[] { -2, -1, -3, -3, -2 }, 0, 5,
        Bidi.DIRECTION_RIGHT_TO_LEFT);
    Bidi line = bd.createLineBidi(1, 4);
    assertFalse(line.baseIsLeftToRight());
    assertEquals(1, line.getBaseLevel());
    assertEquals(3, line.getLength());
    assertEquals(1, line.getLevelAt(0));
    assertEquals(1, line.getLevelAt(1));
    assertEquals(1, line.getLevelAt(2));
    assertEquals(1, line.getLevelAt(1000));
    assertEquals(1, line.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 3, 1 }, }, line);
    assertFalse(line.isLeftToRight());
    assertFalse(line.isMixed());
    assertTrue(line.isRightToLeft());
  }

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                {3, 5},
                {5, 7},
                {7, 9},
        };
        
        Bidi bi = new Bidi(defText, 0);
        final int count = bi.getRunCount();
        for (int i = 0; i < count; i++) {
            assertEquals(expectedRuns[i][0], bi.getRunStart(i));
            assertEquals(expectedRuns[i][1], bi.getRunLimit(i));
        }
    }

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