private static void readAll(File file, AttributeProvider provider, Map<String, Object> map) {
for (String attribute : provider.attributes(file)) {
Object value = provider.get(file, attribute);
// check for null to protect against race condition when an attribute present when
// attributes(file) was called is deleted before get() is called for that attribute
if (value != null) {
map.put(attribute, value);
}
}
}
@Nullable
private Object getAttributeInternal(File file, String view, String attribute) {
AttributeProvider provider = providersByName.get(view);
if (provider == null) {
return null;
}
Object value = provider.get(file, attribute);
if (value == null) {
for (String inheritedView : provider.inherits()) {
value = getAttributeInternal(file, inheritedView, attribute);
if (value != null) {
break;
}
}
}
return value;
}