/**
* Returns the authority. The default implementation returns the first citation returned by {@link
* #getAuthorities()}, with the addition of identifiers from all additional authorities returned
* by the above method.
*
* @see #getAuthorities
*/
@Override
public synchronized Citation getAuthority() {
// No need to synchronize; this is not a big deal if we create this object twice.
if (authority == null) {
final Citation[] authorities = getAuthorities();
switch (authorities.length) {
case 0:
authority = Citations.EPSG;
break;
case 1:
authority = authorities[0];
break;
default:
{
final CitationImpl c = new CitationImpl(authorities[0]);
final Collection<Identifier> identifiers = c.getIdentifiers();
for (int i = 1; i < authorities.length; i++) {
identifiers.addAll(authorities[i].getIdentifiers());
}
c.freeze();
authority = c;
break;
}
}
}
return authority;
}
/** Tests the hash code computation. */
@Test
public void testHashCode() {
final CitationImpl citation = new CitationImpl();
final PropertyAccessor accessor = createPropertyAccessor(citation);
int hashCode = accessor.hashCode(citation);
assertEquals("Empty metadata.", 0, hashCode);
final String ISBN = "Dummy ISBN";
citation.setISBN(ISBN);
hashCode = accessor.hashCode(citation);
assertEquals("Metadata with a single String value.", ISBN.hashCode(), hashCode);
final Set<Object> set = new HashSet<Object>();
assertEquals("By Set.hashCode() contract.", 0, set.hashCode());
assertTrue(set.add(ISBN));
assertEquals("Expected Metadata.hashCode() == Set.hashCode().", set.hashCode(), hashCode);
final InternationalString title = new SimpleInternationalString("Dummy title");
citation.setTitle(title);
hashCode = accessor.hashCode(citation);
assertEquals("Metadata with two values.", ISBN.hashCode() + title.hashCode(), hashCode);
assertTrue(set.add(title));
assertEquals("Expected Metadata.hashCode() == Set.hashCode().", set.hashCode(), hashCode);
assertEquals("CitationsImpl.hashCode() should delegate.", hashCode, citation.hashCode());
final Collection<Object> values = citation.asMap().values();
assertEquals(hashCode, new HashSet<Object>(values).hashCode());
assertTrue(values.containsAll(set));
assertTrue(set.containsAll(values));
}