@Test
public void testInducedPermutation() {
List<String> origData = Arrays.asList(new String[] {"a", "b", "c", "d", "d"});
List<String> permutedData = Arrays.asList(new String[] {"d", "b", "c", "a", "d"});
DummyRandomKey drk = new DummyRandomKey(RandomKey.inducedPermutation(origData, permutedData));
List<String> decoded = drk.decode(origData);
Assert.assertEquals("d", decoded.get(0));
Assert.assertEquals("b", decoded.get(1));
Assert.assertEquals("c", decoded.get(2));
Assert.assertEquals("a", decoded.get(3));
Assert.assertEquals("d", decoded.get(4));
try {
RandomKey.inducedPermutation(
Arrays.asList(new String[] {"a", "b", "c", "d", "d"}),
Arrays.asList(new String[] {"a", "b", "c", "d"}));
Assert.fail("Uncaught exception");
} catch (MathIllegalArgumentException e) {
// no-op
}
try {
RandomKey.inducedPermutation(
Arrays.asList(new String[] {"a", "b", "c", "d", "d"}),
Arrays.asList(new String[] {"a", "b", "c", "d", "f"}));
Assert.fail("Uncaught exception");
} catch (MathIllegalArgumentException e) {
// no-op
}
}
@Test
public void testRandomPermutation() {
// never generate an invalid one
for (int i = 0; i < 10; i++) {
DummyRandomKey drk = new DummyRandomKey(RandomKey.randomPermutation(20));
Assert.assertNotNull(drk);
}
}
@Test
public void testComparatorPermutation() {
List<String> data = Arrays.asList(new String[] {"x", "b", "c", "z", "b"});
List<Double> permutation =
RandomKey.comparatorPermutation(
data,
new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
return o1.compareTo(o2);
}
});
Double[] permArr = new Double[data.size()];
permArr = permutation.toArray(permArr);
Assert.assertArrayEquals(new Double[] {0.6, 0.0, 0.4, 0.8, 0.2}, permArr);
List<String> decodedData = new DummyRandomKey(permutation).decode(data);
Assert.assertEquals("b", decodedData.get(0));
Assert.assertEquals("b", decodedData.get(1));
Assert.assertEquals("c", decodedData.get(2));
Assert.assertEquals("x", decodedData.get(3));
Assert.assertEquals("z", decodedData.get(4));
permutation =
RandomKey.comparatorPermutation(
data,
new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
return o2.compareTo(o1);
}
});
permArr = new Double[data.size()];
permArr = permutation.toArray(permArr);
Assert.assertArrayEquals(new Double[] {0.2, 0.6, 0.4, 0.0, 0.8}, permArr);
decodedData = new DummyRandomKey(permutation).decode(data);
Assert.assertEquals("z", decodedData.get(0));
Assert.assertEquals("x", decodedData.get(1));
Assert.assertEquals("c", decodedData.get(2));
Assert.assertEquals("b", decodedData.get(3));
Assert.assertEquals("b", decodedData.get(4));
}
@Test
public void testIdentityPermutation() {
DummyRandomKey drk = new DummyRandomKey(RandomKey.identityPermutation(5));
List<String> decoded = drk.decode(Arrays.asList(new String[] {"a", "b", "c", "d", "e"}));
Assert.assertEquals("a", decoded.get(0));
Assert.assertEquals("b", decoded.get(1));
Assert.assertEquals("c", decoded.get(2));
Assert.assertEquals("d", decoded.get(3));
Assert.assertEquals("e", decoded.get(4));
}