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| public T getDefaultExtension() {
getExtensionClasses();
if (StringUtils.isBlank(cachedDefaultName) || "true".equals(cachedDefaultName)) {
return null;
}
return getExtension(cachedDefaultName);
}
public T getExtension(String name) {
return getExtension(name, true);
}
public T getExtension(String name, boolean wrap) {
if (StringUtils.isEmpty(name)) {
throw new IllegalArgumentException("Extension name == null");
}
if ("true".equals(name)) {
return getDefaultExtension();
}
final Holder<Object> holder = getOrCreateHolder(name);
Object instance = holder.get();
if (instance == null) {
synchronized (holder) {
instance = holder.get();
if (instance == null) {
instance = createExtension(name, wrap);
holder.set(instance);
}
}
}
return (T) instance;
}
private T createExtension(String name, boolean wrap) {
Class<?> clazz = getExtensionClasses().get(name);
if (clazz == null || unacceptableExceptions.contains(name)) {
throw findException(name);
}
try {
T instance = (T) EXTENSION_INSTANCES.get(clazz);
if (instance == null) {
EXTENSION_INSTANCES.putIfAbsent(clazz, clazz.getDeclaredConstructor().newInstance());
instance = (T) EXTENSION_INSTANCES.get(clazz);
}
injectExtension(instance);
if (wrap) {
List<Class<?>> wrapperClassesList = new ArrayList<>();
if (cachedWrapperClasses != null) {
wrapperClassesList.addAll(cachedWrapperClasses);
wrapperClassesList.sort(WrapperComparator.COMPARATOR);
Collections.reverse(wrapperClassesList);
}
if (CollectionUtils.isNotEmpty(wrapperClassesList)) {
for (Class<?> wrapperClass : wrapperClassesList) {
Wrapper wrapper = wrapperClass.getAnnotation(Wrapper.class);
if (wrapper == null
|| (ArrayUtils.contains(wrapper.matches(), name) && !ArrayUtils.contains(wrapper.mismatches(), name))) {
instance = injectExtension((T) wrapperClass.getConstructor(type).newInstance(instance));
}
}
}
}
initExtension(instance);
return instance;
} catch (Throwable t) {
throw new IllegalStateException("Extension instance (name: " + name + ", class: " +
type + ") couldn't be instantiated: " + t.getMessage(), t);
}
}
|