DirectoryTaxonomyWriter taxoWriter = new DirectoryTaxonomyWriter(dir);
int numCategories = atLeast(10);
int numA = 0, numB = 0;
Random random = random();
// add the two categories for which we'll also add children (so asserts are simpler)
taxoWriter.addCategory(new FacetLabel("a"));
taxoWriter.addCategory(new FacetLabel("b"));
for (int i = 0; i < numCategories; i++) {
if (random.nextBoolean()) {
taxoWriter.addCategory(new FacetLabel("a", Integer.toString(i)));
++numA;
} else {
taxoWriter.addCategory(new FacetLabel("b", Integer.toString(i)));
++numB;
}
}
// add category with no children
taxoWriter.addCategory(new FacetLabel("c"));
taxoWriter.close();
DirectoryTaxonomyReader taxoReader = new DirectoryTaxonomyReader(dir);
// non existing category
ChildrenIterator it = taxoReader.getChildren(taxoReader.getOrdinal(new FacetLabel("invalid")));
assertEquals(TaxonomyReader.INVALID_ORDINAL, it.next());
// a category with no children
it = taxoReader.getChildren(taxoReader.getOrdinal(new FacetLabel("c")));
assertEquals(TaxonomyReader.INVALID_ORDINAL, it.next());
// arbitrary negative ordinal
it = taxoReader.getChildren(-2);
assertEquals(TaxonomyReader.INVALID_ORDINAL, it.next());
// root's children
Set<String> roots = new HashSet<String>(Arrays.asList("a", "b", "c"));
it = taxoReader.getChildren(TaxonomyReader.ROOT_ORDINAL);
while (!roots.isEmpty()) {
FacetLabel root = taxoReader.getPath(it.next());
assertEquals(1, root.length);
assertTrue(roots.remove(root.components[0]));
}
assertEquals(TaxonomyReader.INVALID_ORDINAL, it.next());
for (int i = 0; i < 2; i++) {
FacetLabel cp = i == 0 ? new FacetLabel("a") : new FacetLabel("b");
int ordinal = taxoReader.getOrdinal(cp);
it = taxoReader.getChildren(ordinal);
int numChildren = 0;
int child;
while ((child = it.next()) != TaxonomyReader.INVALID_ORDINAL) {
FacetLabel path = taxoReader.getPath(child);
assertEquals(2, path.length);
assertEquals(path.components[0], i == 0 ? "a" : "b");
++numChildren;
}
int expected = i == 0 ? numA : numB;