org.springframework.beans.factory.support
Class AutowireUtils

java.lang.Object
  org.springframework.beans.factory.support.AutowireUtils

public abstract class AutowireUtils

extends Object

Utility class that contains various methods useful for the implementation of autowire-capable bean factories.

Since:

1.1.2

Author:

Juergen Hoeller

See Also:

AbstractAutowireCapableBeanFactory

Constructor Summary

AutowireUtils()

Method Summary

static int	getTypeDifferenceWeight(Class[] argTypes, Object[] args) Determine a weight that represents the class hierarchy difference between types and arguments.
static void	sortConstructors(Constructor[] constructors) Sort the given constructors, preferring public constructors and "greedy" ones with a maximum of arguments.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AutowireUtils

public AutowireUtils()

Method Detail

sortConstructors

public static void sortConstructors(Constructor[] constructors)

Sort the given constructors, preferring public constructors and "greedy" ones with a maximum of arguments. The result will contain public constructors first, with decreasing number of arguments, then non-public constructors, again with decreasing number of arguments.

Parameters:

constructors - the constructor array to sort

getTypeDifferenceWeight

public static int getTypeDifferenceWeight(Class[] argTypes,
                                          Object[] args)

Determine a weight that represents the class hierarchy difference between types and arguments. A direct match, i.e. type Integer -> arg of class Integer, does not increase the result - all direct matches means weight 0. A match between type Object and arg of class Integer would increase the weight by 2, due to the superclass 2 steps up in the hierarchy (i.e. Object) being the last one that still matches the required type Object. Type Number and class Integer would increase the weight by 1 accordingly, due to the superclass 1 step up the hierarchy (i.e. Number) still matching the required type Number. Therefore, with an arg of type Integer, a constructor (Integer) would be preferred to a constructor (Number) which would in turn be preferred to a constructor (Object). All argument weights get accumulated.

Parameters:

argTypes - the argument types to match

args - the arguments to match

Returns:

the accumulated weight for all arguments