com.github.fracpete.javautils

Class Reflection

java.lang.Object

com.github.fracpete.javautils.Reflection

public class Reflection
extends java.lang.Object

Helper class for reflection. You can:

• instantiate objects
• call methods that return values ("function")
• call methods that don't return anything ("procedure")

Author:

FracPete (fracpete at waikato dot ac dot nz)

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.Class[]	EMPTY_CLASS_ARRAY empty class array.
static java.lang.Object[]	EMPTY_OBJECT_ARRAY empty object array.

Constructor Summary

Constructors

Constructor and Description
Reflection()

Method Summary

Modifier and Type	Method and Description
static <T> T	function(java.lang.Object obj, java.lang.String method) Returns the value from the method call.
static <T> T	function(java.lang.Object obj, java.lang.String method, java.lang.Class[] signature, java.lang.Object[] values) Returns the value from the method call.
static <T> T	newInstance(java.lang.Class<T> cls, java.lang.Class[] signature, java.lang.Object[] values) Instantiates a new instance of the class.
static <T> T	newInstance(java.lang.String cls, java.lang.Class[] signature, java.lang.Object[] values) Instantiates a new instance of the class.
static void	procedure(java.lang.Object obj, java.lang.String method) Calls the method with the specified value(s).
static void	procedure(java.lang.Object obj, java.lang.String method, java.lang.Class[] signature, java.lang.Object[] values) Calls the method with the specified value(s).

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_CLASS_ARRAY

public static java.lang.Class[] EMPTY_CLASS_ARRAY

empty class array.

EMPTY_OBJECT_ARRAY

public static java.lang.Object[] EMPTY_OBJECT_ARRAY

empty object array.

Constructor Detail

Reflection

public Reflection()

Method Detail

newInstance

public static <T> T newInstance(java.lang.String cls,
                                java.lang.Class[] signature,
                                java.lang.Object[] values)
                         throws java.lang.Exception

Instantiates a new instance of the class.

Type Parameters:

T - the type of class to instantiate

Parameters:

cls - the name of the class to instantiate

signature - the signature of the constructor

values - the values for the constructor

Returns:

the new instance

Throws:

java.lang.Exception - if instantiation fails

newInstance

public static <T> T newInstance(java.lang.Class<T> cls,
                                java.lang.Class[] signature,
                                java.lang.Object[] values)
                         throws java.lang.Exception

Instantiates a new instance of the class.

Type Parameters:

T - the type of class to instantiate

Parameters:

cls - the class to instantiate

signature - the signature of the constructor

values - the values for the constructor

Returns:

the new instance

Throws:

java.lang.Exception - if instantiation fails

function

public static <T> T function(java.lang.Object obj,
                             java.lang.String method)
                      throws java.lang.Exception

Returns the value from the method call.

Type Parameters:

T - the type of the result

Parameters:

obj - the object to call the invoke the method on

method - the name of the method to invoke

Returns:

the result of the method call

Throws:

java.lang.Exception - if method call failed

function

public static <T> T function(java.lang.Object obj,
                             java.lang.String method,
                             java.lang.Class[] signature,
                             java.lang.Object[] values)
                      throws java.lang.Exception

Returns the value from the method call.

Type Parameters:

T - the type of the result

Parameters:

obj - the object to call the invoke the method on

method - the name of the method to invoke

signature - the signature of the method

values - the values for the method call

Returns:

the result of the method call

Throws:

java.lang.Exception - if method call failed

procedure

public static void procedure(java.lang.Object obj,
                             java.lang.String method)
                      throws java.lang.Exception

Calls the method with the specified value(s).

Parameters:

obj - the object to call the invoke the method on

method - the name of the method to invoke

Throws:

java.lang.Exception - if method call failed

procedure

public static void procedure(java.lang.Object obj,
                             java.lang.String method,
                             java.lang.Class[] signature,
                             java.lang.Object[] values)
                      throws java.lang.Exception

Calls the method with the specified value(s).

Parameters:

obj - the object to call the invoke the method on

method - the name of the method to invoke

signature - the signature of the method

values - the values for the method call

Throws:

java.lang.Exception - if method call failed