/**
* Checks whether a given annotation is a multi value constraint and returns the contained
* constraints if so.
*
* @param annotation the annotation to check.
* @return A list of constraint annotations or the empty list if <code>annotation</code> is not a
* multi constraint annotation.
*/
public <A extends Annotation> List<Annotation> getMultiValueConstraints(A annotation) {
List<Annotation> annotationList = new ArrayList<Annotation>();
try {
final GetMethod getMethod = GetMethod.action(annotation.getClass(), "value");
final Method method;
if (System.getSecurityManager() != null) {
method = AccessController.doPrivileged(getMethod);
} else {
method = getMethod.run();
}
if (method != null) {
Class returnType = method.getReturnType();
if (returnType.isArray() && returnType.getComponentType().isAnnotation()) {
Annotation[] annotations = (Annotation[]) method.invoke(annotation);
for (Annotation a : annotations) {
if (isConstraintAnnotation(a) || isBuiltinConstraint(a.annotationType())) {
annotationList.add(a);
}
}
}
}
} catch (IllegalAccessException iae) {
// ignore
} catch (InvocationTargetException ite) {
// ignore
}
return annotationList;
}
private void assertGroupsParameterExists(Annotation annotation) {
try {
final GetMethod getMethod = GetMethod.action(annotation.annotationType(), "groups");
final Method method;
if (System.getSecurityManager() != null) {
method = AccessController.doPrivileged(getMethod);
} else {
method = getMethod.run();
}
if (method == null) {
String msg =
annotation.annotationType().getName()
+ " contains Constraint annotation, but does "
+ "not contain a groups parameter.";
throw new ConstraintDefinitionException(msg);
}
Class<?>[] defaultGroups = (Class<?>[]) method.getDefaultValue();
if (defaultGroups.length != 0) {
String msg =
annotation.annotationType().getName()
+ " contains Constraint annotation, but the groups "
+ "paramter default value is not the empty array.";
throw new ConstraintDefinitionException(msg);
}
} catch (ClassCastException e) {
String msg =
annotation.annotationType().getName()
+ " contains Constraint annotation, but the "
+ "groups parameter is of wrong type.";
throw new ConstraintDefinitionException(msg);
}
}
/**
* Checks whether a given annotation is a multi value constraint or not.
*
* @param annotation the annotation to check.
* @return <code>true</code> if the specified annotation is a multi value constraints, <code>false
* </code> otherwise.
*/
public boolean isMultiValueConstraint(Annotation annotation) {
boolean isMultiValueConstraint = false;
try {
final GetMethod getMethod = GetMethod.action(annotation.getClass(), "value");
final Method method;
if (System.getSecurityManager() != null) {
method = AccessController.doPrivileged(getMethod);
} else {
method = getMethod.run();
}
if (method != null) {
Class returnType = method.getReturnType();
if (returnType.isArray() && returnType.getComponentType().isAnnotation()) {
Annotation[] annotations = (Annotation[]) method.invoke(annotation);
for (Annotation a : annotations) {
if (isConstraintAnnotation(a) || isBuiltinConstraint(a.annotationType())) {
isMultiValueConstraint = true;
} else {
isMultiValueConstraint = false;
break;
}
}
}
}
} catch (IllegalAccessException iae) {
// ignore
} catch (InvocationTargetException ite) {
// ignore
}
return isMultiValueConstraint;
}