com.sun.appserv.management.util.misc
Class ClassUtil

java.lang.Object
  com.sun.appserv.management.util.misc.ClassUtil

public final class ClassUtil
extends Object

Provides a variety of useful utilities having to do with classes, types of objects, etc.

Method Summary

static Class<?>	classForName(String name)
static boolean	classIsAccessible(String name)
static boolean	classIsArray(Class theClass) Test whether a Class is an array
static boolean	classnameIsArray(String classname) Test whether a classname is an array
static boolean	classnameIsPrimitiveArray(String classname) Test whether a classname is a primitive array
static String[]	classnamesFromSignature(Class[] classes) Return the corresponding classes for each classname.
static Class	convertArrayClass(Class arrayClass, Class newInnerType) Convert inner element to another type.
static String	ExpandClassName(String name) Expand an abbreviated classname into its true java name.
static Method	findMethod(Class theClass, String methodName, Class[] sig) Find all methods that match the name.
static Set<Method>	findMethods(Method[] candidates, String methodName) Find all methods that match the name.
static int	getArrayDimensions(Class theClass)
static Class	getArrayElementClass(Class arrayClass)
static String	getArrayMemberClassName(String classname) Get the classname for an array element.
static Class	getClassFromName(String classname) Get a Class from a classname.
static Object	getFieldValue(Class theInterface, String name)
static String	getFriendlyClassname(Class theClass) Get a "friendly" classname for a Class.
static String	getFriendlyClassname(String type)
static Class	getInnerArrayElementClass(Class arrayClass)
static String	getPackagePrefix(String classname)
static Package[]	getPackages()
static Package[]	getPackages(ClassLoader cl)
static char	getPrimitiveArrayTypeCode(Class theClass) Return the primitive element type code for an array of primitive types.
static char	getPrimitiveArrayTypeCode(String classname) Return the primitive element type code for an array of primitive types.
static String[]	getTypes(Object[] args) Return the corresponding classes for each element in an Object[] If an element is null, then its corresponding Class will also be null.
static Object	InstantiateDefault(Class inClass) Given a Class, create a new instance with an empty constructor.
static Object	InstantiateFromString(Class theClass, String theString) Given a Class and a String, create a new instance with a constructor that accept a String.
static Object	InstantiateObject(Class theClass, Object[] args) Create a new object of the specified class using a constructor that accepts the specified arguments.
static Object	InstantiateObject(Class theClass, String theString) Create a new object of the specified class using a String constructor.
static boolean	IsPrimitiveClass(Class theClass) Test whether a class is a primitive class.
static Class	ObjectClassToPrimitiveClass(Class theClass) Map primitive class Classes to Object forms eg int.class to Integer.class
static boolean	objectIsArray(Object o) Test whether an Object is an array
static boolean	objectIsPrimitiveArray(Object o) Test whether an Object is an array of primitive types
static Class	PrimitiveClassToObjectClass(Class theClass) Map primitive class Classes to Object forms eg int.class to Integer.class
static String	PrimitiveLetterToClassName(char primitive) Convert a primitive class letter to its corresponding class name.
static Class[]	signatureFromClassnames(String[] classnames) Return the corresponding classes for each classname.
static boolean	signaturesAreCompatible(Class<?>[] callee, Class<?>[] argsSignature) Return true if caller signature is compatible with callee.
static boolean	sigsEqual(Class[] sig1, Class[] sig2)
static String	stripPackageName(String classname) Strip the package name.
static String	stripPackagePrefix(String classname)

Methods inherited from class java.lang.Object

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

Method Detail

classIsAccessible

public static boolean classIsAccessible(String name)

sigsEqual

public static boolean sigsEqual(Class[] sig1,
                                Class[] sig2)

objectIsArray

public static boolean objectIsArray(Object o)

Test whether an Object is an array

Parameters:

o - object to test

Returns:

true if the object is an array, false otherwise.

classIsArray

public static boolean classIsArray(Class theClass)

Test whether a Class is an array

Parameters:

theClass - class to test

Returns:

true if the class is an array, false otherwise.

objectIsPrimitiveArray

public static boolean objectIsPrimitiveArray(Object o)

Test whether an Object is an array of primitive types

Parameters:

o - object to test

Returns:

true if the object is an array, false otherwise.

classnameIsArray

public static boolean classnameIsArray(String classname)

Test whether a classname is an array

Parameters:

classname - classname string

Returns:

true if the object is an array, false otherwise.

stripPackageName

public static String stripPackageName(String classname)

Strip the package name.

Parameters:

classname - classname string

Returns:

the classname, without its package

classnameIsPrimitiveArray

public static boolean classnameIsPrimitiveArray(String classname)

Test whether a classname is a primitive array

Parameters:

classname - classname string

Returns:

true if the object is a primitive array, false otherwise.

getPrimitiveArrayTypeCode

public static char getPrimitiveArrayTypeCode(Class theClass)

Return the primitive element type code for an array of primitive types. Same as getPrimitiveArrayTypeCode( theClass.getName() )

Parameters:

theClass - the Class object

Returns:

the element type code; otherwise (char)0

getPrimitiveArrayTypeCode

public static char getPrimitiveArrayTypeCode(String classname)

Return the primitive element type code for an array of primitive types.

Parameters:

classname - classname string

Returns:

the element type code; otherwise (char)0

getArrayMemberClassName

public static String getArrayMemberClassName(String classname)

Get the classname for an array element.

Parameters:

classname - classname string

Returns:

the classname for the array element

classForName

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

Throws:

ClassNotFoundException

getClassFromName

public static Class getClassFromName(String classname)
                              throws ClassNotFoundException

Get a Class from a classname. Class.forName does not work for primitive types; this methods returns the correct Class for any type.

Parameters:

classname - classname string

Returns:

the classname for the array element

Throws:

ClassNotFoundException

PrimitiveClassToObjectClass

public static Class PrimitiveClassToObjectClass(Class theClass)

Map primitive class Classes to Object forms eg int.class to Integer.class

Parameters:

theClass - the class to map

Returns:

the corresponding Object class or the original Class if not a primitive.

ObjectClassToPrimitiveClass

public static Class ObjectClassToPrimitiveClass(Class theClass)

Map primitive class Classes to Object forms eg int.class to Integer.class

Parameters:

theClass - the class to map

Returns:

the corresponding Object class or the original Class if not a primitive.

IsPrimitiveClass

public static boolean IsPrimitiveClass(Class theClass)

Test whether a class is a primitive class.

Parameters:

theClass - the class to test

Returns:

true if it's a primitive class, false otherwise.

PrimitiveLetterToClassName

public static String PrimitiveLetterToClassName(char primitive)

Convert a primitive class letter to its corresponding class name.

Parameters:

primitive - the primitive character code

Returns:

the corresponding classname

getTypes

public static String[] getTypes(Object[] args)

Return the corresponding classes for each element in an Object[] If an element is null, then its corresponding Class will also be null.

Parameters:

args - an array of objects.

Returns:

an array of classes

signatureFromClassnames

public static Class[] signatureFromClassnames(String[] classnames)
                                       throws ClassNotFoundException

Return the corresponding classes for each classname. If an element is null, then its corresponding Class will also be null.

Parameters:

classnames - an array of classnames.

Returns:

an array of classes

Throws:

ClassNotFoundException

classnamesFromSignature

public static String[] classnamesFromSignature(Class[] classes)

Return the corresponding classes for each classname. If an element is null, then its corresponding Class will also be null.

Parameters:

classes - an array of classnames.

Returns:

an array of classes

getFriendlyClassname

public static String getFriendlyClassname(Class theClass)

Get a "friendly" classname for a Class.

Calls getFriendlyClassname( theClass.getName() )

Parameters:

theClass - the class for which the name should be gotten

Returns:

the "friendly" name

getFriendlyClassname

public static String getFriendlyClassname(String type)

getArrayDimensions

public static int getArrayDimensions(Class theClass)

getArrayElementClass

public static Class getArrayElementClass(Class arrayClass)

getInnerArrayElementClass

public static Class getInnerArrayElementClass(Class arrayClass)
                                       throws ClassNotFoundException

Throws:

ClassNotFoundException

signaturesAreCompatible

public static boolean signaturesAreCompatible(Class<?>[] callee,
                                              Class<?>[] argsSignature)

Return true if caller signature is compatible with callee.

Parameters:

callee - the signature of the method to be called

argsSignature - the signature of the argument list

findMethod

public static final Method findMethod(Class theClass,
                                      String methodName,
                                      Class[] sig)

Find all methods that match the name.

findMethods

public static final Set<Method> findMethods(Method[] candidates,
                                            String methodName)

Find all methods that match the name.

InstantiateObject

public static Object InstantiateObject(Class theClass,
                                       Object[] args)
                                throws Exception

Create a new object of the specified class using a constructor that accepts the specified arguments.

Parameters:

theClass - the Class of the desired Object

args - the argument list for the constructor

Throws:

Exception

InstantiateObject

public static Object InstantiateObject(Class theClass,
                                       String theString)
                                throws Exception

Create a new object of the specified class using a String constructor.

Parameters:

theClass - the Class of the desired Object

theString - the string for a String constructor

Returns:

the resulting Object

Throws:

Exception

InstantiateFromString

public static Object InstantiateFromString(Class theClass,
                                           String theString)
                                    throws Exception

Given a Class and a String, create a new instance with a constructor that accept a String. Primitive types are instantiated as their equivalent Object forms.

Parameters:

theClass - the class from which an instance should be instantiated

theString - the string to be supplied to the constructor

Returns:

the resulting Object

Throws:

Exception

InstantiateDefault

public static Object InstantiateDefault(Class inClass)
                                 throws Exception

Given a Class, create a new instance with an empty constructor. Primitive types are instantiated as their equivalent Object forms. Any value is acceptable in the newly created object.

Parameters:

inClass - the class from which an instance should be instantiated

Returns:

the resulting Object

Throws:

Exception

ExpandClassName

public static String ExpandClassName(String name)

Expand an abbreviated classname into its true java name. Turn "Integer" into "java.lang.Integer", etc.

convertArrayClass

public static Class convertArrayClass(Class arrayClass,
                                      Class newInnerType)
                               throws ClassNotFoundException

Convert inner element to another type. Only works for arrays of Objects. Example: convertArrayClass( "[[[LObject;", "Long" ) =>[[[LLong;

Parameters:

arrayClass -

newInnerType - the desired Class of the innermost element

Throws:

ClassNotFoundException

getPackages

public static Package[] getPackages()

getPackages

public static Package[] getPackages(ClassLoader cl)

getFieldValue

public static Object getFieldValue(Class theInterface,
                                   String name)

stripPackagePrefix

public static String stripPackagePrefix(String classname)

getPackagePrefix

public static String getPackagePrefix(String classname)