org.mule.util
Class ClassUtils

java.lang.Object
  org.apache.commons.lang.ClassUtils
      org.mule.util.ClassUtils

public class ClassUtils
extends ClassUtils

Extend the Apache Commons ClassUtils to provide additional functionality.

This class is useful for loading resources and classes in a fault tolerant manner that works across different applications servers. The resource and classloading methods are SecurityManager friendly.

Field Summary

static Object[]	NO_ARGS
static Class[]	NO_ARGS_TYPE

Fields inherited from class org.apache.commons.lang.ClassUtils

INNER_CLASS_SEPARATOR, INNER_CLASS_SEPARATOR_CHAR, PACKAGE_SEPARATOR, PACKAGE_SEPARATOR_CHAR

Constructor Summary

ClassUtils()

Method Summary

static boolean	compare(Class[] c1, Class[] c2, boolean matchOnObject)
static boolean	equal(Object a, Object b) Is there a better place for this? Simple helper for writing object equalities.
static String	getClassName(Class clazz)
static Class[]	getClassTypes(Object object) Used for creating an array of class types for an array or single object
static Constructor	getConstructor(Class clazz, Class[] paramTypes)
static Method	getMethod(Class clazz, String name, Class[] parameterTypes) Returns a matching method for the given name and parameters on the given class If the parameterTypes arguments is null it will return the first matching method on the class.
static Class[]	getParameterTypes(Object bean, String methodName)
static URL	getResource(String resourceName, Class callingClass) Load a given resource.
static Enumeration	getResources(String resourceName, Class callingClass)
static List	getSatisfiableMethods(Class implementation, Class[] parameterTypes, boolean voidOk, boolean matchOnObject, Collection ignoredMethodNames, WildcardFilter filter) A helper method that will find all matching methods on a class with the given parameter type
static List	getSatisfiableMethods(Class implementation, Class[] parameterTypes, boolean voidOk, boolean matchOnObject, Set ignoredMethodNames) A helper method that will find all matching methods on a class with the given parameter type
static List	getSatisfiableMethodsWithReturnType(Class implementation, Class returnType, boolean matchOnObject, Set ignoredMethodNames)
static String	getSimpleName(Class clazz) Provide a simple-to-understand class name (with access to only Java 1.4 API).
static int	hash(Object[] state)
static Class	initializeClass(Class clazz) Ensure that the given class is properly initialized when the argument is passed in as .class literal.
static Object	instanciateClass(Class clazz, Object[] constructorArgs)
static Object	instanciateClass(String name, Object[] constructorArgs)
static Object	instanciateClass(String name, Object[] constructorArgs, Class callingClass)
static boolean	isClassOnPath(String className, Class currentClass) Can be used by serice endpoints to select which service to use based on what's loaded on the classpath
static boolean	isConcrete(Class clazz)
static Class	loadClass(String className, Class callingClass) Load a class with a given name.
static void	printClassLoader() Prints the current classloader hierarchy - useful for debugging.
static void	printClassLoader(ClassLoader cl) Prints the classloader hierarchy from a given classloader - useful for debugging.
static Class[]	wrappersToPrimitives(Class[] wrappers)
static Class	wrapperToPrimitive(Class wrapper)

Methods inherited from class org.apache.commons.lang.ClassUtils

convertClassesToClassNames, convertClassNamesToClasses, getAllInterfaces, getAllSuperclasses, getClass, getClass, getClass, getClass, getPackageName, getPackageName, getPackageName, getPublicMethod, getShortClassName, getShortClassName, getShortClassName, isAssignable, isAssignable, isInnerClass, primitivesToWrappers, primitiveToWrapper

Methods inherited from class java.lang.Object

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

Field Detail

NO_ARGS

public static final Object[] NO_ARGS

NO_ARGS_TYPE

public static final Class[] NO_ARGS_TYPE

Constructor Detail

ClassUtils

public ClassUtils()

Method Detail

isConcrete

public static boolean isConcrete(Class clazz)

getResource

public static URL getResource(String resourceName,
                              Class callingClass)

Load a given resource.

This method will try to load the resource using the following methods (in order):

• From Thread.currentThread().getContextClassLoader()
• From ClassUtils.class.getClassLoader()
• From the callingClass.getClassLoader()

Parameters:

resourceName - The name of the resource to load

callingClass - The Class object of the calling object

getResources

public static Enumeration getResources(String resourceName,
                                       Class callingClass)

loadClass

public static Class loadClass(String className,
                              Class callingClass)
                       throws ClassNotFoundException

Load a class with a given name.

It will try to load the class in the following order:

• From Thread.currentThread().getContextClassLoader()
• Using the basic Class.forName(java.lang.String)
• From ClassLoaderUtil.class.getClassLoader()
• From the callingClass.getClassLoader()

Parameters:

className - The name of the class to load

callingClass - The Class object of the calling object

Throws:

ClassNotFoundException - If the class cannot be found anywhere.

printClassLoader

public static void printClassLoader()

Prints the current classloader hierarchy - useful for debugging.

printClassLoader

public static void printClassLoader(ClassLoader cl)

Prints the classloader hierarchy from a given classloader - useful for debugging.

initializeClass

public static Class initializeClass(Class clazz)

Ensure that the given class is properly initialized when the argument is passed in as .class literal. This method can never fail unless the bytecode is corrupted or the VM is otherwise seriously confused.

Parameters:

clazz - the Class to be initialized

Returns:

the same class but initialized

instanciateClass

public static Object instanciateClass(Class clazz,
                                      Object[] constructorArgs)
                               throws SecurityException,
                                      NoSuchMethodException,
                                      IllegalArgumentException,
                                      InstantiationException,
                                      IllegalAccessException,
                                      InvocationTargetException

Throws:

SecurityException

NoSuchMethodException

IllegalArgumentException

InstantiationException

IllegalAccessException

InvocationTargetException

instanciateClass

public static Object instanciateClass(String name,
                                      Object[] constructorArgs)
                               throws ClassNotFoundException,
                                      SecurityException,
                                      NoSuchMethodException,
                                      IllegalArgumentException,
                                      InstantiationException,
                                      IllegalAccessException,
                                      InvocationTargetException

Throws:

ClassNotFoundException

SecurityException

NoSuchMethodException

IllegalArgumentException

InstantiationException

IllegalAccessException

InvocationTargetException

instanciateClass

public static Object instanciateClass(String name,
                                      Object[] constructorArgs,
                                      Class callingClass)
                               throws ClassNotFoundException,
                                      SecurityException,
                                      NoSuchMethodException,
                                      IllegalArgumentException,
                                      InstantiationException,
                                      IllegalAccessException,
                                      InvocationTargetException

Throws:

ClassNotFoundException

SecurityException

NoSuchMethodException

IllegalArgumentException

InstantiationException

IllegalAccessException

InvocationTargetException

getParameterTypes

public static Class[] getParameterTypes(Object bean,
                                        String methodName)

getMethod

public static Method getMethod(Class clazz,
                               String name,
                               Class[] parameterTypes)

Returns a matching method for the given name and parameters on the given class If the parameterTypes arguments is null it will return the first matching method on the class.

Parameters:

clazz - the class to find the method on

name - the method name to find

parameterTypes - an array of argument types or null

Returns:

the Method object or null if none was found

getConstructor

public static Constructor getConstructor(Class clazz,
                                         Class[] paramTypes)

getSatisfiableMethods

public static List getSatisfiableMethods(Class implementation,
                                         Class[] parameterTypes,
                                         boolean voidOk,
                                         boolean matchOnObject,
                                         Set ignoredMethodNames)

A helper method that will find all matching methods on a class with the given parameter type

Parameters:

implementation - the class to build methods on

parameterTypes - the argument param types to look for

voidOk - whether void methods shouldbe included in the found list

matchOnObject - determines whether parameters of Object type are matched when they are of Object.class type

ignoredMethodNames - a Set of method names to ignore. Often 'equals' is not a desired match. This argument can be null.

Returns:

a List of methods on the class that match the criteria. If there are none, an empty list is returned

getSatisfiableMethods

public static List getSatisfiableMethods(Class implementation,
                                         Class[] parameterTypes,
                                         boolean voidOk,
                                         boolean matchOnObject,
                                         Collection ignoredMethodNames,
                                         WildcardFilter filter)

A helper method that will find all matching methods on a class with the given parameter type

Parameters:

implementation - the class to build methods on

parameterTypes - the argument param types to look for

voidOk - whether void methods shouldbe included in the found list

matchOnObject - determines whether parameters of Object type are matched when they are of Object.class type

ignoredMethodNames - a Set of method names to ignore. Often 'equals' is not a desired match. This argument can be null.

Returns:

a List of methods on the class that match the criteria. If there are none, an empty list is returned

getSatisfiableMethodsWithReturnType

public static List getSatisfiableMethodsWithReturnType(Class implementation,
                                                       Class returnType,
                                                       boolean matchOnObject,
                                                       Set ignoredMethodNames)

isClassOnPath

public static boolean isClassOnPath(String className,
                                    Class currentClass)

Can be used by serice endpoints to select which service to use based on what's loaded on the classpath

Parameters:

className - The class name to look for

currentClass - the calling class

Returns:

true if the class is on the path

getClassTypes

public static Class[] getClassTypes(Object object)

Used for creating an array of class types for an array or single object

Parameters:

object - single object or array. If this parameter is null or a zero length array then NO_ARGS_TYPE is returned

Returns:

an array of class types for the object

getClassName

public static String getClassName(Class clazz)

compare

public static boolean compare(Class[] c1,
                              Class[] c2,
                              boolean matchOnObject)

wrapperToPrimitive

public static Class wrapperToPrimitive(Class wrapper)

wrappersToPrimitives

public static Class[] wrappersToPrimitives(Class[] wrappers)

getSimpleName

public static String getSimpleName(Class clazz)

Provide a simple-to-understand class name (with access to only Java 1.4 API).

Parameters:

clazz - The class whose name we will generate

Returns:

A readable name for the class

equal

public static boolean equal(Object a,
                            Object b)

Is there a better place for this? Simple helper for writing object equalities.

hash

public static int hash(Object[] state)