Package org.apache.commons.crypto.utils

Class ReflectionUtils

java.lang.Object

org.apache.commons.crypto.utils.ReflectionUtils

public final class ReflectionUtils
extends Object

General utility methods for working with reflection.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	ReflectionUtils.NegativeCacheSentinel	A unique class which is used as a sentinel value in the caching for getClassByName.

Field Summary

Fields

Modifier and Type	Field	Description
private static final Map<ClassLoader,Map<String,WeakReference<Class<?>>>>	CACHE_CLASSES
private static final ClassLoader	CLASSLOADER
private static final Class<?>	NEGATIVE_CACHE_SENTINEL	Sentinel value to store negative cache results in CACHE_CLASSES.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ReflectionUtils()	The private constructor of ReflectionUtils.

Method Summary

Modifier and Type	Method	Description
static Class<?>	getClassByName(String name)	Loads a class by name.
private static Class<?>	getClassByNameOrNull(String name)	Loads a class by name, returning null rather than throwing an exception if it couldn't be loaded.
static <T> T	newInstance(Class<T> klass, Object... args)	Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.

Methods inherited from class java.lang.Object

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

Field Details

CACHE_CLASSES

private static final Map<ClassLoader,Map<String,WeakReference<Class<?>>>> CACHE_CLASSES

CLASSLOADER

private static final ClassLoader CLASSLOADER

NEGATIVE_CACHE_SENTINEL

private static final Class<?> NEGATIVE_CACHE_SENTINEL

Sentinel value to store negative cache results in CACHE_CLASSES.

Constructor Details

ReflectionUtils

private ReflectionUtils()

The private constructor of ReflectionUtils.

Method Details

getClassByName

public static Class<?> getClassByName(String name)
                               throws ClassNotFoundException

Loads a class by name.

Parameters:

name - the class name.

Returns:

the class object.

Throws:

ClassNotFoundException - if the class is not found.

getClassByNameOrNull

private static Class<?> getClassByNameOrNull(String name)

Loads a class by name, returning null rather than throwing an exception if it couldn't be loaded. This is to avoid the overhead of creating an exception.

Parameters:

name - the class name.

Returns:

the class object, or null if it could not be found.

newInstance

public static <T> T newInstance(Class<T> klass,
 Object... args)

Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.

Type Parameters:

T - type for the new instance

Parameters:

klass - the Class object.

args - array of objects to be passed as arguments to the constructor call.

Returns:

a new object created by calling the constructor this object represents.