com.bigdata.io

Class LongPackerTestCase

java.lang.Object

junit.framework.Assert

junit.framework.TestCase

com.bigdata.io.LongPackerTestCase

All Implemented Interfaces:

junit.framework.Test

public class LongPackerTestCase
extends junit.framework.TestCase

TestAll suite for LongPacker.

Version:

$Id$

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
static long	SIGN_MASK

Constructor Summary

Constructors

Constructor and Description
LongPackerTestCase()
LongPackerTestCase(String name)

Method Summary

Methods

Modifier and Type	Method and Description
static void	assertEquals(String msg, byte[] expected, byte[] actual)
void	doPackTest(long v, byte[] expected)
void	doStressTest(int ntrials, com.bigdata.io.LongPackerTestCase.LongGenerator g) Run a stress test.
void	doUnpackTest(long expected, byte[] packed) Unpacks a long.
int	getNBytes(int firstByte) Given the first byte of a packed long value, return the #of bytes into which that value was packed (including this one).
void	test_getNibbleLength()
void	testHighBit()
void	testNBytes()
void	testPack()
void	testStressRandom() Run a large #of random pack/unpack operations to sample the space while showing correctness on those samples.
void	testStressSequence() Run a large #of pack/unpack operations on a sequence of long values to demonstrate correctness in that sequence.
void	testUnpack()

Methods inherited from class junit.framework.TestCase

assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertFalse, assertFalse, assertNotNull, assertNotNull, assertNotSame, assertNotSame, assertNull, assertNull, assertSame, assertSame, assertTrue, assertTrue, countTestCases, createResult, fail, fail, failNotEquals, failNotSame, failSame, format, getName, run, run, runBare, runTest, setName, setUp, tearDown, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

SIGN_MASK

public static final long SIGN_MASK

See Also:

Constant Field Values

Constructor Detail

LongPackerTestCase

public LongPackerTestCase()

LongPackerTestCase

public LongPackerTestCase(String name)

Parameters:

name -

Method Detail

doUnpackTest

public void doUnpackTest(long expected,
                byte[] packed)
                  throws IOException

Unpacks a long.

Parameters:

expected - The expected long value.

packed - The packed byte[].

Throws:

IOException - If there was not enough data.

junit.framework.AssertionFailedError - If there is too much data.

getNBytes

public int getNBytes(int firstByte)

Given the first byte of a packed long value, return the #of bytes into which that value was packed (including this one).

Parameters:

firstByte - The first byte.

Returns:

The #of bytes. This is in the range [1:8] inclusive.

testNBytes

public void testNBytes()

testUnpack

public void testUnpack()
                throws IOException

Throws:

IOException

doPackTest

public void doPackTest(long v,
              byte[] expected)
                throws IOException

Throws:

IOException

test_getNibbleLength

public void test_getNibbleLength()

testPack

public void testPack()
              throws IOException

Throws:

IOException

testHighBit

public void testHighBit()

testStressSequence

public void testStressSequence()
                        throws IOException

Run a large #of pack/unpack operations on a sequence of long values to demonstrate correctness in that sequence. The sequence is the long values from -1 to 1M by one (dense coverage).

Throws:

IOException

testStressRandom

public void testStressRandom()
                      throws IOException

Run a large #of random pack/unpack operations to sample the space while showing correctness on those samples. The amount of compression due to packing for this test is very small since all bits are equally likely to be non-zero, so the #of bytes required on average to pack a long value is 8.

Throws:

IOException

doStressTest

public void doStressTest(int ntrials,
                com.bigdata.io.LongPackerTestCase.LongGenerator g)
                  throws IOException

Run a stress test. Writes some information of possible interest onto System.err.

Parameters:

ntrials - #of trials.

g - Generator for the long values.

Throws:

IOException

assertEquals

public static void assertEquals(String msg,
                byte[] expected,
                byte[] actual)