public ListTag(Type elementType) {
checkNotNull(elementType);
this.elementType = elementType;
List<Tag> baseList = Lists.newArrayList();
Constraint<Tag> constraint = new TypeConstraint();
value = Constraints.constrainedList(baseList, constraint);
}
public ListTag(Collection<? extends Tag> collection) {
checkArgument(!collection.isEmpty());
List<Tag> baseList = Lists.newArrayList(collection);
elementType = baseList.get(0).getTagType();
Constraint<Tag> constraint = new TypeConstraint();
for (Tag tag : baseList) {
constraint.checkElement(tag);
}
value = Constraints.constrainedList(baseList, constraint);
}
public void testRemoveIf_randomAccess_notPermittingDuplicates() {
// https://github.com/google/guava/issues/1596
final List<String> delegate = newArrayList("a", "b", "c", "d", "e");
List<String> uniqueList =
Constraints.constrainedList(
delegate,
new Constraint<String>() {
@Override
public String checkElement(String element) {
checkArgument(
!delegate.contains(element), "this list does not permit duplicate elements");
return element;
}
});
assertTrue(uniqueList instanceof RandomAccess);
assertTrue(
Iterables.removeIf(
uniqueList,
new Predicate<String>() {
@Override
public boolean apply(String s) {
return s.equals("b") || s.equals("d") || s.equals("f");
}
}));
assertEquals(newArrayList("a", "c", "e"), uniqueList);
assertFalse(
Iterables.removeIf(
uniqueList,
new Predicate<String>() {
@Override
public boolean apply(String s) {
return s.equals("x") || s.equals("y") || s.equals("z");
}
}));
assertEquals(newArrayList("a", "c", "e"), uniqueList);
}
public static <T> List<T> newNotNullLinkedList() {
return Constraints.constrainedList(new LinkedList<T>(), Constraints.notNull());
}