com.cloudera.oryx.common.lang

Class ClassUtils

java.lang.Object

com.cloudera.oryx.common.lang.ClassUtils

public final class ClassUtils
extends Object

Class-related utility methods.

Method Summary

Modifier and Type	Method and Description
static boolean	classExists(String implClassName)
static <T> Class<T>	loadClass(String className)
static <T> Class<? extends T>	loadClass(String className, Class<T> superClass)
static <T> T	loadInstanceOf(Class<T> clazz) Like loadInstanceOf(String, Class) where the reference returned is of the same type as the class being loaded -- not any supertype.
static <T> T	loadInstanceOf(String implClassName, Class<T> superClass) Like loadInstanceOf(String, Class, Class[], Object[]) for no-arg constructors.
static <T> T	loadInstanceOf(String implClassName, Class<T> superClass, Class<?>[] constructorTypes, Object[] constructorArgs) Loads and instantiates a named implementation class, a subclass of a given supertype, whose constructor takes the given arguments.

Methods inherited from class java.lang.Object

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

Method Detail

loadClass

public static <T> Class<T> loadClass(String className)

Type Parameters:

T - expected type of returned Class

Parameters:

className - fully-qualified class name, which should be known to be available

Returns:

Class for that named class

loadClass

public static <T> Class<? extends T> loadClass(String className,
                                               Class<T> superClass)

Type Parameters:

T - type of returned Class

Parameters:

className - fully-qualified class name, which should be known to be available

superClass - reference type of returned Class

Returns:

Class for that named class

classExists

public static boolean classExists(String implClassName)

Parameters:

implClassName - class name to text

Returns:

true if the class exists in the JVM and can be loaded

loadInstanceOf

public static <T> T loadInstanceOf(Class<T> clazz)

Like loadInstanceOf(String, Class) where the reference returned is of the same type as the class being loaded -- not any supertype.

Type Parameters:

T - type of returned instance

Parameters:

clazz - Class to make an instance of

Returns:

instance of clazz

loadInstanceOf

public static <T> T loadInstanceOf(String implClassName,
                                   Class<T> superClass)

Like loadInstanceOf(String, Class, Class[], Object[]) for no-arg constructors.

Type Parameters:

T - type of returned instance

Parameters:

implClassName - implementation class name

superClass - superclass or interface that the implementation extends

Returns:

instance of implClassName

loadInstanceOf

public static <T> T loadInstanceOf(String implClassName,
                                   Class<T> superClass,
                                   Class<?>[] constructorTypes,
                                   Object[] constructorArgs)

Loads and instantiates a named implementation class, a subclass of a given supertype, whose constructor takes the given arguments.

Type Parameters:

T - type of returned instance

Parameters:

implClassName - implementation class name

superClass - superclass or interface that the implementation extends

constructorTypes - argument types of constructor to use

constructorArgs - actual constructor arguments

Returns:

instance of implClassName