org.apache.bookkeeper.common.util

Class ReflectionUtils

java.lang.Object

org.apache.bookkeeper.common.util.ReflectionUtils

public class ReflectionUtils
extends java.lang.Object

General Class Reflection Utils.

Constructor Summary

Constructors

Constructor and Description
ReflectionUtils()

Method Summary

Modifier and Type	Method and Description
static <T> java.lang.Class<? extends T>	forName(java.lang.String className, java.lang.Class<T> xface) Returns the Class object object associated with the class or interface with the given string name, which is a subclass of xface.
static java.lang.Class<?>	getClass(org.apache.commons.configuration.Configuration conf, java.lang.String name, java.lang.Class<?> defaultCls, java.lang.ClassLoader classLoader) Get the value of the name property as a Class.
static <T> java.lang.Class<? extends T>	getClass(org.apache.commons.configuration.Configuration conf, java.lang.String name, java.lang.Class<? extends T> defaultValue, java.lang.Class<T> xface, java.lang.ClassLoader classLoader) Get the value of the name property as a Class implementing the interface specified by xface.
static <T> T	newInstance(java.lang.Class<T> theCls) Create an object for the given class.
static <T> T	newInstance(java.lang.String clsName, java.lang.Class<T> xface) Create an object using the given class name.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionUtils

public ReflectionUtils()

Method Detail

forName

public static <T> java.lang.Class<? extends T> forName(java.lang.String className,
                                                       java.lang.Class<T> xface)

Returns the Class object object associated with the class or interface with the given string name, which is a subclass of xface.

Parameters:

className - class name

xface - class interface

Returns:

the class object associated with the class or interface with the given string name.

getClass

public static java.lang.Class<?> getClass(org.apache.commons.configuration.Configuration conf,
                                          java.lang.String name,
                                          java.lang.Class<?> defaultCls,
                                          java.lang.ClassLoader classLoader)
                                   throws org.apache.commons.configuration.ConfigurationException

Get the value of the name property as a Class. If no such property is specified, then defaultCls is returned.

Parameters:

conf - Configuration Object.

name - Class Property Name.

defaultCls - Default Class to be returned.

classLoader - Class Loader to load class.

Returns:

property value as a Class, or defaultCls.

Throws:

org.apache.commons.configuration.ConfigurationException

getClass

public static <T> java.lang.Class<? extends T> getClass(org.apache.commons.configuration.Configuration conf,
                                                        java.lang.String name,
                                                        java.lang.Class<? extends T> defaultValue,
                                                        java.lang.Class<T> xface,
                                                        java.lang.ClassLoader classLoader)
                                                 throws org.apache.commons.configuration.ConfigurationException

Get the value of the name property as a Class implementing the interface specified by xface.

If no such property is specified, then defaultValue is returned.

An exception is thrown if the returned class does not implement the named interface.

Parameters:

conf - Configuration Object.

name - Class Property Name.

defaultValue - Default Class to be returned.

xface - The interface implemented by the named class.

classLoader - Class Loader to load class.

Returns:

property value as a Class, or defaultValue.

Throws:

org.apache.commons.configuration.ConfigurationException

newInstance

public static <T> T newInstance(java.lang.Class<T> theCls)

Create an object for the given class.

Parameters:

theCls - class of which an object is created.

Returns:

a new object

newInstance

public static <T> T newInstance(java.lang.String clsName,
                                java.lang.Class<T> xface)

Create an object using the given class name.

Parameters:

clsName - class name of which an object is created.

xface - The interface implemented by the named class.

Returns:

a new object