/**
* Return true if the type is not abstract and not an interface, and has a constructor annotated
* with {@link Inject} or its only constructor is the default constructor.
*
* @param type A class type
* @return True if the class type is instantiable
*/
public static boolean isInstantiable(Class<?> type) {
if (!Modifier.isAbstract(type.getModifiers()) && !type.isInterface()) {
// first check for a constructor annotated with @Inject,
// - this doesn't care how many we'll let the injector complain
// if there are more than one
for (Constructor<?> c : type.getDeclaredConstructors()) {
if (c.getAnnotation(Inject.class) != null) {
return true;
}
}
// check if we only have the public default constructor
if (type.getConstructors().length == 1
&& type.getConstructors()[0].getParameterTypes().length == 0) {
return true;
}
}
// no constructor available
return false;
}
