/**
* Method called to create a "default instance" of the bean, currently only needed for obtaining
* default field values which may be used for suppressing serialization of fields that have "not
* changed".
*
* @param fixAccess If true, method is allowed to fix access to the default constructor (to be
* able to call non-public constructor); if false, has to use constructor as is.
* @return Instance of class represented by this descriptor, if suitable default constructor was
* found; null otherwise.
*/
public Object instantiateBean(boolean fixAccess) {
AnnotatedConstructor ac = _classInfo.getDefaultConstructor();
if (ac == null) {
return null;
}
if (fixAccess) {
ac.fixAccess();
}
try {
return ac.getAnnotated().newInstance();
} catch (Exception e) {
Throwable t = e;
while (t.getCause() != null) {
t = t.getCause();
}
if (t instanceof Error) throw (Error) t;
if (t instanceof RuntimeException) throw (RuntimeException) t;
throw new IllegalArgumentException(
"Failed to instantiate bean of type "
+ _classInfo.getAnnotated().getName()
+ ": ("
+ t.getClass().getName()
+ ") "
+ t.getMessage(),
t);
}
}
/**
* Method that can be called to locate a single-arg constructor that takes specified exact type
* (will not accept supertype constructors)
*
* @param argTypes Type(s) of the argument that we are looking for
*/
public Constructor<?> findSingleArgConstructor(Class<?>... argTypes) {
for (AnnotatedConstructor ac : _classInfo.getConstructors()) {
// This list is already filtered to only include accessible
/* (note: for now this is a redundant check; but in future
* that may change; thus leaving here for now)
*/
if (ac.getParameterCount() == 1) {
Class<?> actArg = ac.getParameterClass(0);
for (Class<?> expArg : argTypes) {
if (expArg == actArg) {
return ac.getAnnotated();
}
}
}
}
return null;
}