/**
* Find an accessible constructor with compatible parameters. Compatible parameters mean that
* every method parameter is assignable from the given parameters. In other words, it finds
* constructor that will take the parameters given.
*
* <p>First it checks if there is constructor matching the exact signature. If no such, all the
* constructors of the class are tested if their signatures are assignment compatible with the
* parameter types. The first matching constructor is returned.
*
* @param cls find constructor for this class
* @param parameterTypes find method with compatible parameters
* @return a valid Constructor object. If there's no matching constructor, returns <code>null
* </code>.
*/
public static Constructor getMatchingAccessibleConstructor(Class cls, Class[] parameterTypes) {
// see if we can find the constructor directly
// most of the time this works and it's much faster
try {
Constructor ctor = cls.getConstructor(parameterTypes);
MemberUtils.setAccessibleWorkaround(ctor);
return ctor;
} catch (NoSuchMethodException e) {
/* SWALLOW */
}
Constructor result = null;
// search through all constructors
Constructor[] ctors = cls.getConstructors();
for (int i = 0; i < ctors.length; i++) {
// compare parameters
if (ClassUtils.isAssignable(parameterTypes, ctors[i].getParameterTypes(), true)) {
// get accessible version of method
Constructor ctor = getAccessibleConstructor(ctors[i]);
if (ctor != null) {
MemberUtils.setAccessibleWorkaround(ctor);
if (result == null
|| MemberUtils.compareParameterTypes(
ctor.getParameterTypes(), result.getParameterTypes(), parameterTypes)
< 0) {
result = ctor;
}
}
}
}
return result;
}
/**
* Find an accessible method that matches the given name and has compatible parameters. Compatible
* parameters mean that every method parameter is assignable from the given parameters. In other
* words, it finds a method with the given name that will take the parameters given.
*
* <p>
*
* <p>This method is used by {@link #invokeMethod(Object object, String methodName, Object[] args,
* Class[] parameterTypes)}.
*
* <p>This method can match primitive parameter by passing in wrapper classes. For example, a
* <code>Boolean</code> will match a primitive <code>boolean</code> parameter.
*
* @param cls find method in this class
* @param methodName find method with this name
* @param parameterTypes find method with most compatible parameters
* @return The accessible method
*/
public static Method getMatchingAccessibleMethod(
Class cls, String methodName, Class[] parameterTypes) {
try {
Method method = cls.getMethod(methodName, parameterTypes);
MemberUtils.setAccessibleWorkaround(method);
return method;
} catch (NoSuchMethodException e) {
/* SWALLOW */
}
// search through all methods
Method bestMatch = null;
Method[] methods = cls.getMethods();
for (int i = 0, size = methods.length; i < size; i++) {
if (methods[i].getName().equals(methodName)) {
// compare parameters
if (ClassUtils.isAssignable(parameterTypes, methods[i].getParameterTypes(), true)) {
// get accessible version of method
Method accessibleMethod = getAccessibleMethod(methods[i]);
if (accessibleMethod != null) {
if (bestMatch == null
|| MemberUtils.compareParameterTypes(
accessibleMethod.getParameterTypes(),
bestMatch.getParameterTypes(),
parameterTypes)
< 0) {
bestMatch = accessibleMethod;
}
}
}
}
}
if (bestMatch != null) {
MemberUtils.setAccessibleWorkaround(bestMatch);
}
return bestMatch;
}
