/** TODO: Test me ! And move me to CRS utility class */
private static String srs(CoordinateReferenceSystem crs) {
if (crs != null && crs.getIdentifiers() != null)
for (Identifier id : crs.getIdentifiers()) {
String srs = id.toString();
if (srs.startsWith("EPSG")) return srs; // $NON-NLS-1$
}
return "EPSG:4326"; //$NON-NLS-1$
}
/** Returns {@code true} if the specified identifiers contains the {@code "EPSG"} code. */
static boolean containsEPSG(final Object identifiers) {
assertTrue(identifiers instanceof Collection);
@SuppressWarnings("unchecked")
final Collection<Identifier> collection = (Collection) identifiers;
for (final Identifier id : collection) {
if (id.getCode().equals("EPSG")) {
return true;
}
}
return false;
}
/** Returns the names of all currently registered authorities. */
public static synchronized Set<String> getAuthorityNames() {
/*
* IMPORTANT: Return the same Set instance (unmodifiable) as long as there is no change
* in the list of registered factories, and create a new instance in case of changes.
* 'add/removeAuthorityFactory(...)' and 'scanForPlugins()' methods reset 'authorityNames'
* to null, which will cause the creation of a new Set instance. Some implementations like
* AllAuthoritiesFactory rely on this behavior as a way to be notified of registration
* changes for clearing their cache.
*/
if (authorityNames == null) {
authorityNames = new LinkedHashSet<String>();
final Hints hints = EMPTY_HINTS;
loop:
for (int i = 0; ; i++) {
final Set<? extends AuthorityFactory> factories;
switch (i) {
case 0:
factories = getCRSAuthorityFactories(hints);
break;
case 1:
factories = getCSAuthorityFactories(hints);
break;
case 2:
factories = getDatumAuthorityFactories(hints);
break;
case 3:
factories = getCoordinateOperationAuthorityFactories(hints);
break;
default:
break loop;
}
for (final AuthorityFactory factory : factories) {
final Citation authority = factory.getAuthority();
if (authority != null) {
authorityNames.add(Citations.getIdentifier(authority));
for (final Identifier id : authority.getIdentifiers()) {
authorityNames.add(id.getCode());
}
}
}
}
authorityNames = Collections.unmodifiableSet(authorityNames);
}
return authorityNames;
}