org.yestech.lib.lang
Class Clazz

java.lang.Object
  org.yestech.lib.lang.Clazz

public final class Clazz
extends java.lang.Object

Utility Class for Dealing with Class and Reflection.

Method Summary

static java.lang.Class	getClass(java.lang.String classFqn) Looks up and retrieves an Initialized class.
static java.lang.reflect.Constructor	getConstructor(java.lang.Class clazz, java.lang.Class[] ctorTypes) Returns a Cached Constructor associated with the Class.
static java.lang.reflect.Method	getMethod(java.lang.Class clazz, java.lang.String methodName, java.lang.Class[] argTypes) Returns a Cached Method associated by the methodName.
static java.lang.reflect.Method	getMethod(java.lang.String classFQN, java.lang.String methodName, java.lang.Class[] params) Returns the Method that is a associated with the FQN class.
static <I> I	instantiateClass(java.lang.Class clazz) Instantiates a Class from a Class.
static <I> I	instantiateClass(java.lang.String classFQN) Instantiates a Class from a Fully Qualified Name.
static java.lang.Object	invoke(java.lang.reflect.Method method, java.lang.Object[] methodArgs, java.lang.Object instance) Dynamically invokes a method using the supplied params as the parameters for the call.
static java.lang.Object	invoke(java.lang.String classFQN, java.lang.String methodName, java.lang.Class[] params, java.lang.Object[] methodArgs, java.lang.Object instance) Dynamically invokes a method using the supplied params as the parameters for the call.

Methods inherited from class java.lang.Object

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

Method Detail

getClass

public static java.lang.Class getClass(java.lang.String classFqn)

Looks up and retrieves an Initialized class. This means that the class with only load it's static block!

Parameters:

classFqn - FQN of the class to initialize

Returns:

The initialized Class

Throws:

java.lang.RuntimeException - If error happens Loading or Initializing

instantiateClass

public static <I> I instantiateClass(java.lang.String classFQN)

Instantiates a Class from a Fully Qualified Name. It assumes that there is a default Constructor.

Parameters:

classFQN - FQN of the class to Instantiate

Returns:

The Instantiated Class

Throws:

java.lang.RuntimeException - If error happens Instantiating

instantiateClass

public static <I> I instantiateClass(java.lang.Class clazz)

Instantiates a Class from a Class. It assumes that there is a default Constructor.

Parameters:

clazz - Class to Instantiate

Returns:

The Instantiated Class

Throws:

java.lang.RuntimeException - If error happens Instantiating

getMethod

public static java.lang.reflect.Method getMethod(java.lang.String classFQN,
                                                 java.lang.String methodName,
                                                 java.lang.Class[] params)

Returns the Method that is a associated with the FQN class.

Parameters:

classFQN - The FQN of the class method is a member of

methodName - The method name

params - Array of Class the are in the method parameter list

Returns:

the Method found

Throws:

java.lang.RuntimeException - If error happens Loading Method

invoke

public static java.lang.Object invoke(java.lang.reflect.Method method,
                                      java.lang.Object[] methodArgs,
                                      java.lang.Object instance)

Dynamically invokes a method using the supplied params as the parameters for the call. If the method being invoked is static, the instance should be null.

Parameters:

method - Method to invoke

methodArgs - Parameters that will be passed to the method

instance - Instance of the Onject to invoke method on. (null if method is static)

Returns:

The result of the method call

Throws:

java.lang.RuntimeException - If error happens Invoking Method

invoke

public static java.lang.Object invoke(java.lang.String classFQN,
                                      java.lang.String methodName,
                                      java.lang.Class[] params,
                                      java.lang.Object[] methodArgs,
                                      java.lang.Object instance)

Dynamically invokes a method using the supplied params as the parameters for the call. If the method being invoked is static, the instance should be null.

Parameters:

classFQN - The FQN of the class method is a member of

methodName - The method name

params - Array of Class the are in the method parameter list

methodArgs - Parameters that will be passed to the method

instance - Instance of the Onject to invoke method on. (null if method is static)

Returns:

The result of the method call

Throws:

java.lang.RuntimeException - If error happens Invoking Method

getMethod

public static java.lang.reflect.Method getMethod(java.lang.Class clazz,
                                                 java.lang.String methodName,
                                                 java.lang.Class[] argTypes)

Returns a Cached Method associated by the methodName. If the method isn't in the cache a new one is created and added to the cache. There will ALWAYS be only one method instance in the cache.

Parameters:

clazz - Class method associated with

methodName - Name of the method

argTypes - Class Array of argument types in method signature

Returns:

The Method

getConstructor

public static java.lang.reflect.Constructor getConstructor(java.lang.Class clazz,
                                                           java.lang.Class[] ctorTypes)

Returns a Cached Constructor associated with the Class. If the Constructor isn't in the cache a new one is created and added to the cache. There will ALWAYS be only one Constructor instance in the cache.

Parameters:

clazz - Class Constructor associated with

ctorTypes - Class Array of argument types in Constructors signature

Returns:

The Constructor