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

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


  public void testBadFlags() {
    bd = new Bidi("", 173);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(0, bd.getLength());
    assertEquals(0, bd.getLevelAt(0));
    assertEquals(0, bd.getLevelAt(1000));

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    assertFalse(bd.isRightToLeft());
  }


  public void testBadEmbeddings() {
    try {
      bd = new Bidi("".toCharArray(), 0, new byte[] {}, 0, 1,
          Bidi.DIRECTION_RIGHT_TO_LEFT);
      fail("should throw IAE");
    } catch (IllegalArgumentException e) {
      // expected
    }

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      // expected
    }
  }


  public void testOverrideEmbeddings() {
    bd = new Bidi(new char[] { 's', 's', 's' }, 0, new byte[] { (byte) -7,
        (byte) -2, (byte) -3 }, 0, 3,
        Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(7, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(3, bd.getLevelAt(2));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(3, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 7 }, { 1, 2, 2 },
        { 2, 3, 3 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi(new char[] { 's', 's', 's' }, 0, new byte[] { (byte) -1,
        (byte) -2, (byte) -3 }, 0, 3,
        Bidi.DIRECTION_DEFAULT_RIGHT_TO_LEFT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(3, bd.getLevelAt(2));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(3, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 2 },
        { 2, 3, 3 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi(new char[] { 's', 's', 's' }, 0, new byte[] { (byte) -1,
        (byte) -2, (byte) -3 }, 0, 3, Bidi.DIRECTION_LEFT_TO_RIGHT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(3, bd.getLevelAt(2));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(3, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 2 },
        { 2, 3, 3 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi(new char[] { 's', 's', 's' }, 0, new byte[] { (byte) -1,
        (byte) -2, (byte) -3 }, 0, 3, Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));

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


  public void testDefaultEmbeddings() {
    bd = new Bidi(new char[] { 's', 's', 's' }, 0, new byte[] { (byte) 0,
        (byte) 0, (byte) 0 }, 0, 3, Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(2, bd.getLevelAt(0));

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


  public void testRelativeEmbeddings() {
    bd = new Bidi(new char[] { 's', 's', 's' }, 0, new byte[] { (byte) 1,
        (byte) 2, (byte) 3 }, 0, 3, Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(3, bd.getLength());
    assertEquals(2, bd.getLevelAt(0));

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


  public void testSimpleHebrewParagraph() {
    bd = new Bidi("\u05D0", Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(1, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(1, bd.getLevelAt(1000));
    assertEquals(1, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertFalse(bd.isMixed());
    assertTrue(bd.isRightToLeft());


    bd = new Bidi("\u05D0", Bidi.DIRECTION_DEFAULT_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(1, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(1, bd.getLevelAt(1000));
    assertEquals(1, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertFalse(bd.isMixed());
    assertTrue(bd.isRightToLeft());


    bd = new Bidi("\u05D0", Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(1, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(1, bd.getLevelAt(1000));

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


  public void testSimpleBidiParagraph_1() {
    bd = new Bidi("\u05D0a", Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(1, bd.getLevelAt(1000));
    assertEquals(2, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 2 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi("\u05D0a", Bidi.DIRECTION_DEFAULT_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));
    assertEquals(1, bd.getLevelAt(1000));
    assertEquals(2, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 2 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi("\u05D0a", Bidi.DIRECTION_LEFT_TO_RIGHT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(0, bd.getLevelAt(1));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(2, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 1 }, { 1, 2, 0 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi("\u05D0a", Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(2, bd.getLevelAt(1));

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


  public void testSimpleBidiParagraph_2() {
    bd = new Bidi("a\u05D0", Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(0, bd.getLevelAt(0));
    assertEquals(1, bd.getLevelAt(1));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(2, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 0 }, { 1, 2, 1 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi("a\u05D0", Bidi.DIRECTION_DEFAULT_RIGHT_TO_LEFT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(0, bd.getLevelAt(0));
    assertEquals(1, bd.getLevelAt(1));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(2, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 0 }, { 1, 2, 1 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi("a\u05D0", Bidi.DIRECTION_LEFT_TO_RIGHT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(0, bd.getLevelAt(0));
    assertEquals(1, bd.getLevelAt(1));
    assertEquals(0, bd.getLevelAt(1000));
    assertEquals(2, bd.getRunCount());
    assertRunArrayEquals(new int[][] { { 0, 1, 0 }, { 1, 2, 1 }, }, bd);
    assertFalse(bd.isLeftToRight());
    assertTrue(bd.isMixed());
    assertFalse(bd.isRightToLeft());


    bd = new Bidi("a\u05D0", Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    assertEquals(1, bd.getBaseLevel());
    assertEquals(2, bd.getLength());
    assertEquals(2, bd.getLevelAt(0));
    assertEquals(1, bd.getLevelAt(1));

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   * spec reads: public static final int DIRECTION_RIGHT_TO_LEFT Constant
   * indicating base direction is right-to-left. according to that, the method
   * baseIsLeftToRight() here should return false. however, RI doesn't act so.
   */
  public void testRIBug_1() {
    bd = new Bidi("t", Bidi.DIRECTION_RIGHT_TO_LEFT);
    assertFalse(bd.baseIsLeftToRight());
    // the base level it the essential cause
    assertEquals(1, bd.getBaseLevel());
    assertEquals(1, bd.getLength());
    assertEquals(2, bd.getLevelAt(0));

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    assertFalse(bd.isRightToLeft());
  }


  // this is essentially the same bug as Bug_1
  public void testRIBug_2() {
    bd = new Bidi("\u05D0", Bidi.DIRECTION_LEFT_TO_RIGHT);
    assertTrue(bd.baseIsLeftToRight());
    assertEquals(0, bd.getBaseLevel());
    assertEquals(1, bd.getLength());
    assertEquals(1, bd.getLevelAt(0));
    assertEquals(0, bd.getLevelAt(1000));

View Full Code Here

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