public static T getSingleton()

in phoenix-queryserver/src/main/java/org/apache/phoenix/util/InstanceResolver.java [46:58]

• 13 lines of code
• 5 McCabe index (conditional complexity)

    public static <T> T getSingleton(Class<T> clazz, T defaultInstance) {
        Object obj = RESOLVED_SINGLETONS.get(clazz);
        if(obj != null) {
            return (T)obj;
        }
        if (defaultInstance != null && !clazz.isInstance(defaultInstance)) throw new IllegalArgumentException("defaultInstance is not of type " + clazz.getName());
        final Object o = resolveSingleton(clazz, defaultInstance);
        obj = RESOLVED_SINGLETONS.putIfAbsent(clazz, o);
        if(obj == null) {
            obj = o;
        }
        return (T)obj;
    }