private static final Map<String, Object> subsetAttributes(
final CommonInfo igc, final Collection<String> keysToPreserve) {
Map<String, Object> attributes = new HashMap<String, Object>(keysToPreserve.size());
for (final String key : keysToPreserve) {
if (igc.hasAttribute(key)) attributes.put(key, igc.getAttribute(key));
}
return attributes;
}
public boolean hasAttribute(String key) {
return commonInfo.hasAttribute(key);
}