pt.moredata.tests
Class PrivilegedAccessor

java.lang.Object
  pt.moredata.tests.PrivilegedAccessor

public class PrivilegedAccessor

extends java.lang.Object

a.k.a. The "ObjectMolester"

This class is used to access a method or field of an object no matter what the access modifier of the method or field. The syntax for accessing fields and methods is out of the ordinary because this class uses reflection to peel away protection.

Here is an example of using this to access a private member. resolveName is a private method of Class.

 Class c = Class.class;
 System.out.println(
      PrivilegedAccessor.invokeMethod( c,
                                       "resolveName",
                                       "/net/iss/common/PrivilegeAccessor" ) );
 

Author:

Charlie Hubbard (chubbard@iss.net), Prashant Dhokte (pdhokte@iss.net)

Constructor Summary

PrivilegedAccessor()

Method Summary

static java.lang.reflect.Method	getMethod(java.lang.Object instance, java.lang.String methodName, java.lang.Class[] classTypes)
static java.lang.Object	getValue(java.lang.Object instance, java.lang.String fieldName) Gets the value of the named field and returns it as an object.
static java.lang.Object	invokeMethod(java.lang.Object instance, java.lang.String methodName, java.lang.Object arg) Calls a method on the given object instance with the given argument.
static java.lang.Object	invokeMethod(java.lang.Object instance, java.lang.String methodName, java.lang.Object[] args) Calls a method on the given object instance with the given arguments.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrivilegedAccessor

public PrivilegedAccessor()

Method Detail

getValue

public static java.lang.Object getValue(java.lang.Object instance,
                                        java.lang.String fieldName)
                                 throws java.lang.IllegalAccessException,
                                        java.lang.NoSuchFieldException

Gets the value of the named field and returns it as an object.

Parameters:

instance - the object instance

fieldName - the name of the field

Returns:

an object representing the value of the field

Throws:

java.lang.IllegalAccessException

java.lang.NoSuchFieldException

invokeMethod

public static java.lang.Object invokeMethod(java.lang.Object instance,
                                            java.lang.String methodName,
                                            java.lang.Object arg)
                                     throws java.lang.NoSuchMethodException,
                                            java.lang.IllegalAccessException,
                                            java.lang.reflect.InvocationTargetException

Calls a method on the given object instance with the given argument.

Parameters:

instance - the object instance

methodName - the name of the method to invoke

arg - the argument to pass to the method

Throws:

java.lang.NoSuchMethodException

java.lang.IllegalAccessException

java.lang.reflect.InvocationTargetException

See Also:

invokeMethod(Object,String,Object[])

invokeMethod

public static java.lang.Object invokeMethod(java.lang.Object instance,
                                            java.lang.String methodName,
                                            java.lang.Object[] args)
                                     throws java.lang.NoSuchMethodException,
                                            java.lang.IllegalAccessException,
                                            java.lang.reflect.InvocationTargetException

Calls a method on the given object instance with the given arguments.

Parameters:

instance - the object instance

methodName - the name of the method to invoke

args - an array of objects to pass as arguments

Throws:

java.lang.NoSuchMethodException

java.lang.IllegalAccessException

java.lang.reflect.InvocationTargetException

See Also:

invokeMethod(Object,String,Object)

getMethod

public static java.lang.reflect.Method getMethod(java.lang.Object instance,
                                                 java.lang.String methodName,
                                                 java.lang.Class[] classTypes)
                                          throws java.lang.NoSuchMethodException

Parameters:

instance - the object instance

methodName - the

Throws:

java.lang.NoSuchMethodException