Java Code Examples for org.apache.commons.lang.ArrayUtils.EMPTY_BYTE_ARRAY

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Example 1
Project: ditb   File: TestRegionSplitter.java   View Source Code Vote up 4 votes
/**
 * Unit tests for the UniformSplit algorithm. Makes sure it divides up the space of
 * keys in the way that we expect.
 */
@Test
public void unitTestUniformSplit() {
    UniformSplit splitter = new UniformSplit();

    // Check splitting while starting from scratch
    try {
        splitter.split(1);
        throw new AssertionError("Splitting into <2 regions should have thrown exception");
    } catch (IllegalArgumentException e) { }

    byte[][] twoRegionsSplits = splitter.split(2);
    assertEquals(1, twoRegionsSplits.length);
    assertArrayEquals(twoRegionsSplits[0],
        new byte[] { (byte) 0x80, 0, 0, 0, 0, 0, 0, 0 });

    byte[][] threeRegionsSplits = splitter.split(3);
    assertEquals(2, threeRegionsSplits.length);
    byte[] expectedSplit0 = new byte[] {0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55};
    assertArrayEquals(expectedSplit0, threeRegionsSplits[0]);
    byte[] expectedSplit1 = new byte[] {(byte)0xAA, (byte)0xAA, (byte)0xAA, (byte)0xAA,
            (byte)0xAA, (byte)0xAA, (byte)0xAA, (byte)0xAA};
    assertArrayEquals(expectedSplit1, threeRegionsSplits[1]);

    // Check splitting existing regions that have start and end points
    byte[] splitPoint = splitter.split(new byte[] {0x10}, new byte[] {0x30});
    assertArrayEquals(new byte[] {0x20}, splitPoint);

    byte[] lastRow = new byte[] {xFF, xFF, xFF, xFF, xFF, xFF, xFF, xFF};
    assertArrayEquals(lastRow, splitter.lastRow());
    byte[] firstRow = ArrayUtils.EMPTY_BYTE_ARRAY;
    assertArrayEquals(firstRow, splitter.firstRow());

    splitPoint = splitter.split(firstRow, new byte[] {0x20});
    assertArrayEquals(splitPoint, new byte[] {0x10});

    splitPoint = splitter.split(new byte[] {(byte)0xdf, xFF, xFF, xFF, xFF,
            xFF, xFF, xFF}, lastRow);
    assertArrayEquals(splitPoint,
            new byte[] {(byte)0xef, xFF, xFF, xFF, xFF, xFF, xFF, xFF});

    splitPoint = splitter.split(new byte[] {'a', 'a', 'a'}, new byte[] {'a', 'a', 'b'});
    assertArrayEquals(splitPoint, new byte[] {'a', 'a', 'a', (byte)0x80 });
}