org.lsst.ccs.utilities.reflect

Class ConstructorUtils

java.lang.Object

org.lsst.ccs.utilities.reflect.ConstructorUtils

public class ConstructorUtils
extends Object

Author:

The LSST CCS Team

Field Summary

Fields

Modifier and Type	Field and Description
static Class	NULL_CLASS This variable is to be used when it is not possible to determine the class of the argument because its value is null.

Method Summary

Modifier and Type	Method and Description
static Constructor	getMatchingConstructor(Class<?> klass, Class<?>[] argumentsClasses) Find a constructor that can be used given an array of argument types.
static Type	getParameterType(Constructor c, int index) Returns the type of the parameter at a given index of the given constructor

Methods inherited from class java.lang.Object

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

Field Detail

NULL_CLASS

public static Class NULL_CLASS

This variable is to be used when it is not possible to determine the class of the argument because its value is null.

Method Detail

getMatchingConstructor

public static Constructor getMatchingConstructor(Class<?> klass,
                                                 Class<?>[] argumentsClasses)

Find a constructor that can be used given an array of argument types. It extends the capabilities of the isAssignableFrom method which does not cover primitive types in a context of passing arguments to the constructor. It first looks for non varargs constructor, and then for varargs ones.

Parameters:

klass - the class to introspect

argumentsClasses - the arguments

Returns:

a constructor that matches the given argument types

getParameterType

public static Type getParameterType(Constructor c,
                                    int index)

Returns the type of the parameter at a given index of the given constructor

Parameters:

c - the constructor

index - the index of the parameter

Returns:

the resolved type.