Package com.okta.commons.lang

Class Classes

java.lang.Object

com.okta.commons.lang.Classes

public class Classes
extends Object

Since:

0.5.0

Constructor Summary

Constructors

Constructor	Description
Classes()

Method Summary

Modifier and Type	Method	Description
static <T> Class<T>	forName(String fqcn)	Attempts to load the specified class name from the current thread's context class loader, then the current ClassLoader (Classes.class.getClassLoader()), then the system/application ClassLoader (ClassLoader.getSystemClassLoader(), in that order.
static <T> Constructor<T>	getConstructor(Class<T> clazz, Class... argTypes)
static InputStream	getResourceAsStream(String name)	Returns the specified resource by checking the current thread's context class loader, then the current ClassLoader (Classes.class.getClassLoader()), then the system/application ClassLoader (ClassLoader.getSystemClassLoader(), in that order, using getResourceAsStream(name).
static <T> T	instantiate(Constructor<T> ctor, Object... args)
static boolean	isAvailable(String fullyQualifiedClassName)
static <T> T	loadFromService(Class<T> clazz)
static <T> T	loadFromService(Class<T> clazz, String errorMessage)
static <T> T	newInstance(Class<T> clazz)
static <T> T	newInstance(Class<T> clazz, Object... args)
static <T> T	newInstance(String fqcn)
static <T> T	newInstance(String fqcn, Object... args)

Methods inherited from class java.lang.Object

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

Constructor Details

Classes

public Classes()

Method Details

forName

public static <T> Class<T> forName(String fqcn)
                            throws UnknownClassException

Attempts to load the specified class name from the current thread's context class loader, then the current ClassLoader (Classes.class.getClassLoader()), then the system/application ClassLoader (ClassLoader.getSystemClassLoader(), in that order. If any of them cannot locate the specified class, an UnknownClassException is thrown (our RuntimeException equivalent of the JRE's ClassNotFoundException.

Type Parameters:

T - type of class

Parameters:

fqcn - the fully qualified class name to load

Returns:

the located class

Throws:

UnknownClassException - if the class cannot be found.

getResourceAsStream

public static InputStream getResourceAsStream(String name)

Returns the specified resource by checking the current thread's context class loader, then the current ClassLoader (Classes.class.getClassLoader()), then the system/application ClassLoader (ClassLoader.getSystemClassLoader(), in that order, using getResourceAsStream(name).

Parameters:

name - the name of the resource to acquire from the classloader(s).

Returns:

the InputStream of the resource found, or null if the resource cannot be found from any of the three mentioned ClassLoaders.

isAvailable

public static boolean isAvailable(String fullyQualifiedClassName)

newInstance

public static <T> T newInstance(String fqcn)

newInstance

public static <T> T newInstance(String fqcn,
 Object... args)

newInstance

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

newInstance

public static <T> T newInstance(Class<T> clazz,
 Object... args)

getConstructor

public static <T> Constructor<T> getConstructor(Class<T> clazz,
 Class... argTypes)

instantiate

public static <T> T instantiate(Constructor<T> ctor,
 Object... args)

loadFromService

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

loadFromService

public static <T> T loadFromService(Class<T> clazz,
 String errorMessage)