@Test
public void sortByExample1() {
List<Integer> example = asList(1, 3, 5, 2, 4, 6);
assertEquals(example, Algorithms.sortByExample(example, asList(6, 5, 4, 3, 2, 1)));
assertEquals(asList(3, 5, 4), Algorithms.sortByExample(example, asList(5, 4, 3)));
assertEquals(example, Algorithms.sortByExample(example, asList(1, 2, 3, 4, 5, 6, 7, 8, 9)));
}
@Test
public void sortByExample4() {
List<Integer> example = asList(1, 3, 5, 2, 4, 6);
final List<String> expected = asList("1", "3", "5", "2", "4", "6");
assertEquals(
expected,
Algorithms.sortByExample(
example,
Strings.<Integer>string(),
asList("6", "5", "4", "3", "2", "1"),
Functions.<String>identity()));
assertEquals(
asList("3", "5", "4"),
Algorithms.sortByExample(
example,
Strings.<Integer>string(),
asList("5", "4", "3"),
Functions.<String>identity()));
assertEquals(
expected,
Algorithms.sortByExample(
example,
Strings.<Integer>string(),
asList("1", "2", "3", "4", "5", "6", "7", "8", "9"),
Functions.<String>identity()));
}
@Test
public void one() {
final List<String> values = asList("a", "b", "a", "c", "a", "d", "e");
assertTrue(Algorithms.one(values, Conditions.eq("c")));
assertTrue(Algorithms.one(values, Conditions.eq("a")));
assertTrue(Algorithms.one(values, Conditions.eq("e")));
assertFalse(Algorithms.one(values, Conditions.eq("f")));
}
@Test
public void first() {
final List<String> values = asList("a", "b", "a", "c", "a", "d", "e");
assertEquals("c", Algorithms.first(values, Conditions.eq("c")));
assertEquals("a", Algorithms.first(values, Conditions.eq("a")));
assertEquals("e", Algorithms.first(values, Conditions.eq("e")));
assertNull(Algorithms.first(values, Conditions.eq("f")));
}
@SuppressWarnings({"ImplicitNumericConversion"})
@Test
public void count() {
final List<String> values = asList("a", "b", "a", "c", "a", "d", "e");
assertEquals(3, Algorithms.count(values, Conditions.eq("a")));
assertEquals(1, Algorithms.count(values, Conditions.eq("e")));
assertEquals(0, Algorithms.count(values, Conditions.eq("f")));
}
@Test
public void select2() {
final List<String> values = asList("a", "b", "a", "c", "a", "d", "e");
assertEquals(
asList("a", "a", "a"),
Algorithms.select(values, new ArrayList<String>(10), Conditions.eq("a")));
}
@Test
public void zip1() {
// Should result in a JoinResult that looks like: [(0,1,7), (1,2,8), (2,3,9)]
final List<JoinResult<Integer, Integer, Integer>> results =
Algorithms.zip(asList(1, 2, 3), asList(7, 8, 9));
final Iterator<JoinResult<Integer, Integer, Integer>> r = results.iterator();
for (int i = 0; i < 3; i++) {
final JoinResult<Integer, Integer, Integer> result = r.next();
assertEquals(Integer.valueOf(i), result.getKey());
assertEquals(Integer.valueOf(i + 1), result.getX());
assertEquals(Integer.valueOf(i + 7), result.getY());
}
}
@Test
public void map1() {
final List<String> values = asList("a", "b", "c");
final List<String> results =
Algorithms.map(
values,
new ArrayList<String>(10),
new Function<String, String>() {
public String apply(String s) {
return s + "1";
}
});
assertEquals(asList("a1", "b1", "c1"), results);
}
@Test
public void partition1() {
final List<Integer> values = asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
Map<Boolean, Collection<Integer>> partitioned =
Algorithms.partition(
values,
new Condition<Integer>() {
public boolean eval(Integer integer) {
return integer % 2 == 0;
}
});
assertEquals(asList(1, 3, 5, 7, 9), partitioned.get(false));
assertEquals(asList(2, 4, 6, 8, 10), partitioned.get(true));
}
@Test
public void all() {
final List<String> values = asList("a", "b", "a", "c", "a", "d", "e");
assertTrue(Algorithms.all(values, Conditions.gte("a")));
assertTrue(Algorithms.all(values, Conditions.lt("z")));
assertTrue(Algorithms.all(values, Conditions.lte("e")));
assertFalse(Algorithms.all(values, Conditions.gt("b")));
assertFalse(Algorithms.all(values, Conditions.eq("a")));
assertFalse(Algorithms.all(values, Conditions.eq("f")));
}
@SuppressWarnings({"ImplicitNumericConversion"})
@Test
public void partition3() {
final List<Integer> values = asList(1, 2, 3, 4, 5, 6, 7, 8, 9);
Map<Integer, Collection<Integer>> partitioned =
Algorithms.partition(
values,
new Function<Integer, Integer>() {
public Integer apply(Integer integer) {
return integer % 3;
}
});
assertEquals(3, partitioned.size());
assertEquals(asList(3, 6, 9), partitioned.get(0));
assertEquals(asList(1, 4, 7), partitioned.get(1));
assertEquals(asList(2, 5, 8), partitioned.get(2));
}
@Test
public void partition2() {
final List<Integer> values = asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
List<Integer> trueResults = new ArrayList<Integer>(5);
List<Integer> falseResults = new ArrayList<Integer>(5);
Algorithms.partition(
values,
trueResults,
falseResults,
new Condition<Integer>() {
public boolean eval(Integer integer) {
return integer % 2 == 0;
}
});
assertEquals(asList(1, 3, 5, 7, 9), falseResults);
assertEquals(asList(2, 4, 6, 8, 10), trueResults);
}
@Test
public void sortByExample3() {
// We have the names of some people in the right order, but then we want to sort the actual
// Person objects
// into the same order. Providing a mapping function from the Person to his/her name is all we
// need.
final Person huey = new Person("huey");
final Person dewey = new Person("dewey");
final Person louie = new Person("louie");
List<String> example = asList("donald", huey.getName(), dewey.getName(), louie.getName());
assertEquals(
asList(huey, dewey, louie),
Algorithms.sortByExample(
example,
asList(dewey, louie, huey),
new Function<Person, String>() {
public String apply(Person p) {
return p.getName();
}
}));
}