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Classes (JBoss/Common API) - JBoss 4.0.1 sp1 common API Documentation 英文版文档

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org.jboss.util
Class Classes

java.lang.Object
  org.jboss.util.Classes

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public final class Classes

extends Object

A collection of Class utilities.

Version:

$Revision: 1.7 $

Author:

Jason Dillon, Scott.Stark@jboss.org

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Field Summary
static String	DEFAULT_PACKAGE_NAME           The default package name.
static String	PACKAGE_SEPARATOR           The string used to separator packages
static char	PACKAGE_SEPARATOR_CHAR           The characther used to separator packages

 

Constructor Summary

Classes()

 

Method Summary
static Class[]	convertToJavaClasses(Iterator it, ClassLoader cl)           Convert a list of Strings from an Interator into an array of Classes (the Strings are taken as classnames).
static void	forceLoad(Class type)           Force the given class to be loaded fully.
static Method	getAttributeGetter(Class cls, String attr)           Returns attribute's getter method.
static Method	getAttributeSetter(Class cls, String attr, Class type)           Returns attribute's setter method.
static String	getPackageName(Class type)           Get the package name of the specified class.
static String	getPackageName(String classname)           Get the package name of the specified class.
static Class	getPrimitiveTypeForName(String name)           Get the primitive type for the given primitive name.
static Class	getPrimitiveWrapper(Class type)           Get the wrapper class for the given primitive type.
static boolean	isPrimitive(Class type)           Check if the given class is a primitive class or a primitive wrapper class.
static boolean	isPrimitive(String type)           Check type against boolean, byte, char, short, int, long, float, double.
static boolean	isPrimitiveWrapper(Class type)           Check if the given class is a primitive wrapper class.
static Class	loadClass(String className)           This method acts equivalently to invoking Thread.currentThread().getContextClassLoader().loadClass(className); but it also supports primitive types and array classes of object types or primitive types.
static Class	loadClass(String className, ClassLoader classLoader)           This method acts equivalently to invoking classLoader.loadClass(className) but it also supports primitive types and array classes of object types or primitive types.
static String	stripPackageName(Class type)           Get the short name of the specified class by striping off the package name.
static String	stripPackageName(String classname)           Get the short name of the specified class by striping off the package name.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

PACKAGE_SEPARATOR

public static final String PACKAGE_SEPARATOR

The string used to separator packages

See Also:

Constant Field Values

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PACKAGE_SEPARATOR_CHAR

public static final char PACKAGE_SEPARATOR_CHAR

The characther used to separator packages

See Also:

Constant Field Values

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DEFAULT_PACKAGE_NAME

public static final String DEFAULT_PACKAGE_NAME

The default package name.

See Also:

Constant Field Values

Constructor Detail

Classes

public Classes()

Method Detail

stripPackageName

public static String stripPackageName(String classname)

Get the short name of the specified class by striping off the package name.

Parameters:

classname - Class name.

Returns:

Short class name.

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stripPackageName

public static String stripPackageName(Class type)

Get the short name of the specified class by striping off the package name.

Parameters:

type - Class name.

Returns:

Short class name.

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getPackageName

public static String getPackageName(String classname)

Get the package name of the specified class.

Parameters:

classname - Class name.

Returns:

Package name or "" if the classname is in the default package.

Throws:

EmptyStringException - Classname is an empty string.

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getPackageName

public static String getPackageName(Class type)

Get the package name of the specified class.

Parameters:

type - Class.

Returns:

Package name.

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forceLoad

public static void forceLoad(Class type)

Force the given class to be loaded fully.

This method attempts to locate a static method on the given class the attempts to invoke it with dummy arguments in the hope that the virtual machine will prepare the class for the method call and call all of the static class initializers.

Parameters:

type - Class to force load.

Throws:

NullArgumentException - Type is null.

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getPrimitiveTypeForName

public static Class getPrimitiveTypeForName(String name)

Get the primitive type for the given primitive name.

For example, "boolean" returns Boolean.TYPE and so on...

Parameters:

name - Primitive type name (boolean, int, byte, ...)

Returns:

Primitive type or null.

Throws:

IllegalArgumentException - Type is not a primitive class

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getPrimitiveWrapper

public static Class getPrimitiveWrapper(Class type)

Get the wrapper class for the given primitive type.

Parameters:

type - Primitive class.

Returns:

Wrapper class for primitive.

Throws:

IllegalArgumentException - Type is not a primitive class

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isPrimitiveWrapper

public static boolean isPrimitiveWrapper(Class type)

Check if the given class is a primitive wrapper class.

Parameters:

type - Class to check.

Returns:

True if the class is a primitive wrapper.

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isPrimitive

public static boolean isPrimitive(Class type)

Check if the given class is a primitive class or a primitive wrapper class.

Parameters:

type - Class to check.

Returns:

True if the class is a primitive or primitive wrapper.

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isPrimitive

public static boolean isPrimitive(String type)

Check type against boolean, byte, char, short, int, long, float, double.

Parameters:

type - The java type name

Returns:

true if this is a primative type name.

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loadClass

public static Class loadClass(String className)
                       throws ClassNotFoundException

This method acts equivalently to invoking Thread.currentThread().getContextClassLoader().loadClass(className); but it also supports primitive types and array classes of object types or primitive types.

Parameters:

className - the qualified name of the class or the name of primitive type or array in the same format as returned by the java.lang.Class.getName() method.

Returns:

the Class object for the requested className

Throws:

ClassNotFoundException - when the classLoader can not find the requested class

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loadClass

public static Class loadClass(String className,
                              ClassLoader classLoader)
                       throws ClassNotFoundException

This method acts equivalently to invoking classLoader.loadClass(className) but it also supports primitive types and array classes of object types or primitive types.

Parameters:

className - the qualified name of the class or the name of primitive type or array in the same format as returned by the java.lang.Class.getName() method.

classLoader - the ClassLoader used to load classes

Returns:

the Class object for the requested className

Throws:

ClassNotFoundException - when the classLoader can not find the requested class

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convertToJavaClasses

public static final Class[] convertToJavaClasses(Iterator it,
                                                 ClassLoader cl)
                                          throws ClassNotFoundException

Convert a list of Strings from an Interator into an array of Classes (the Strings are taken as classnames).

Parameters:

it - A java.util.Iterator pointing to a Collection of Strings

cl - The ClassLoader to use

Returns:

Array of Classes

Throws:

ClassNotFoundException - When a class could not be loaded from the specified ClassLoader

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getAttributeGetter

public static final Method getAttributeGetter(Class cls,
                                              String attr)
                                       throws NoSuchMethodException

Returns attribute's getter method. If the method not found then NoSuchMethodException will be thrown.

Parameters:

cls - the class the attribute belongs too

attr - the attribute's name

Returns:

attribute's getter method

Throws:

NoSuchMethodException - if the getter was not found

NoSuchMethodException

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getAttributeSetter

public static final Method getAttributeSetter(Class cls,
                                              String attr,
                                              Class type)
                                       throws NoSuchMethodException

Returns attribute's setter method. If the method not found then NoSuchMethodException will be thrown.

Parameters:

cls - the class the attribute belongs to

attr - the attribute's name

type - the attribute's type

Returns:

attribute's setter method

Throws:

NoSuchMethodException - if the setter was not found

NoSuchMethodException

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