org.sf.jlaunchpad.util
Class ReflectionUtil

java.lang.Object
  org.sf.jlaunchpad.util.ReflectionUtil

public class ReflectionUtil
extends java.lang.Object

This is the class for holding reflection utilities.

Version:

1.0 02/19/2006

Author:

Alexander Shvets

Constructor Summary

ReflectionUtil()

Method Summary

static java.lang.reflect.Method	getMainMethod(java.lang.Class clazz) Searches for the "main" method.
protected static java.lang.reflect.Method	getMainMethod(java.lang.Class clazz, java.lang.Class[] paramTypes) Searches for the "main" method.
static java.lang.reflect.Method	getMainMethodWithTwoParameters(java.lang.Class clazz, java.lang.Class secondParameterClass) Searches for the "main" method.
static java.lang.Object	getPrivateField(java.lang.Object source, java.lang.Class clazz, java.lang.String name) Gets the private filed.
static java.lang.Object	invokePrivateMethod(java.lang.Object source, java.lang.Object[] parameters, java.lang.Class clazz, java.lang.String name, java.lang.Class[] parameterTypes) Invokes the private method.
static java.lang.Object	launchClass(java.lang.Class mainClass, java.lang.String[] args, java.lang.String illegalArgumentMessage) Tries to launch the class.
static java.lang.Object	launchClass(java.lang.reflect.Method mainMethod, java.lang.Object[] args, java.lang.String illegalArgumentMessage) Tries to launch the class.
static void	setPrivateField(java.lang.Object source, java.lang.Class clazz, java.lang.String name, java.lang.Object value) Sets the private filed.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionUtil

public ReflectionUtil()

Method Detail

getMainMethod

public static java.lang.reflect.Method getMainMethod(java.lang.Class clazz)

Searches for the "main" method.

Parameters:

clazz - the class where we are searching for "main" methd

Returns:

the "main" method

getMainMethodWithTwoParameters

public static java.lang.reflect.Method getMainMethodWithTwoParameters(java.lang.Class clazz,
                                                                      java.lang.Class secondParameterClass)

Searches for the "main" method.

Parameters:

clazz - the class where we are searching for "main" methd

secondParameterClass - second parameter class

Returns:

the "main" method

getMainMethod

protected static java.lang.reflect.Method getMainMethod(java.lang.Class clazz,
                                                        java.lang.Class[] paramTypes)

Searches for the "main" method.

Parameters:

clazz - the class where we are searching for "main" methd

paramTypes - parameter types

Returns:

the "main" method

launchClass

public static java.lang.Object launchClass(java.lang.Class mainClass,
                                           java.lang.String[] args,
                                           java.lang.String illegalArgumentMessage)
                                    throws java.lang.IllegalAccessException,
                                           java.lang.reflect.InvocationTargetException

Tries to launch the class.

Parameters:

mainClass - the class to be launched

args - the list of arguments

illegalArgumentMessage - the message to be displayed if main method cannot be found

Returns:

result

Throws:

java.lang.IllegalAccessException - exception

java.lang.reflect.InvocationTargetException - exception

launchClass

public static java.lang.Object launchClass(java.lang.reflect.Method mainMethod,
                                           java.lang.Object[] args,
                                           java.lang.String illegalArgumentMessage)
                                    throws java.lang.IllegalAccessException,
                                           java.lang.reflect.InvocationTargetException

Tries to launch the class.

Parameters:

mainMethod - main method

args - the list of arguments

illegalArgumentMessage - the message to be displayed if main method cannot be found

Returns:

result

Throws:

java.lang.IllegalAccessException - exception

java.lang.reflect.InvocationTargetException - exception

getPrivateField

public static java.lang.Object getPrivateField(java.lang.Object source,
                                               java.lang.Class clazz,
                                               java.lang.String name)
                                        throws java.lang.NoSuchFieldException,
                                               java.lang.IllegalAccessException

Gets the private filed. Required, if you cannot make changes in inheritance and still need to access the private field.

Parameters:

source - the source object

name - the field name to access

clazz - the class

Returns:

the private filed

Throws:

java.lang.NoSuchFieldException - the exception

java.lang.IllegalAccessException - the exception

setPrivateField

public static void setPrivateField(java.lang.Object source,
                                   java.lang.Class clazz,
                                   java.lang.String name,
                                   java.lang.Object value)
                            throws java.lang.NoSuchFieldException,
                                   java.lang.IllegalAccessException

Sets the private filed. Required, if you cannot make changes in inheritance and still need to access the private field.

Parameters:

source - the source object

clazz - the class

name - the field name to access

value - the value

Throws:

java.lang.NoSuchFieldException - the exception

java.lang.IllegalAccessException - the exception

invokePrivateMethod

public static java.lang.Object invokePrivateMethod(java.lang.Object source,
                                                   java.lang.Object[] parameters,
                                                   java.lang.Class clazz,
                                                   java.lang.String name,
                                                   java.lang.Class[] parameterTypes)
                                            throws java.lang.NoSuchMethodException,
                                                   java.lang.IllegalAccessException,
                                                   java.lang.reflect.InvocationTargetException

Invokes the private method. Required, if you cannot make changes in inheritance and still need to call the private method.

Parameters:

source - the source object

parameters - the parameters list

clazz - the source class

name - the method name

parameterTypes - the list of parameter types

Returns:

the result of invokation

Throws:

java.lang.NoSuchMethodException - the exception

java.lang.IllegalAccessException - the exception

java.lang.reflect.InvocationTargetException - the exception