classUtils.javassist.reflect
Class ClassMetaobject

java.lang.Object
  classUtils.javassist.reflect.ClassMetaobject

All Implemented Interfaces:

java.io.Serializable

public class ClassMetaobject
extends java.lang.Object
implements java.io.Serializable

A runtime class metaobject.

A ClassMetaobject is created for every class of reflective objects. It can be used to hold values shared among the reflective objects of the same class.

See Also:

Metaobject, Serialized Form

Field Summary

static boolean

useContextClassLoader Specifies how a java.lang.Class object is loaded.

Constructor Summary

ClassMetaobject(java.lang.String[] params)
Constructs a ClassMetaobject.

Method Summary

java.lang.Class	getJavaClass() Obtains the java.lang.Class representing this class.
java.lang.String	getMethodName(int identifier) Returns the name of the method specified by identifier.
java.lang.String	getName() Obtains the name of this class.
java.lang.Class[]	getParameterTypes(int identifier) Returns an array of Class objects representing the formal parameter types of the method specified by identifier.
java.lang.reflect.Method[]	getReflectiveMethods() Returns an array of the methods defined on the given reflective object.
java.lang.Class	getReturnType(int identifier) Returns a Class objects representing the return type of the method specified by identifier.
static java.lang.Object	invoke(java.lang.Object target, int identifier, java.lang.Object[] args) Invokes a method whose name begins with methodPrefix "_m_" and the identifier.
boolean	isInstance(java.lang.Object obj) Returns true if obj is an instance of this class.
java.lang.Object	newInstance(java.lang.Object[] args) Creates a new instance of the class.
java.lang.Object	trapFieldRead(java.lang.String name) Is invoked when static fields of the base-level class are read and the runtime system intercepts it.
void	trapFieldWrite(java.lang.String name, java.lang.Object value) Is invoked when static fields of the base-level class are modified and the runtime system intercepts it.
java.lang.Object	trapMethodcall(int identifier, java.lang.Object[] args) Is invoked when static methods of the base-level class are called and the runtime system intercepts it.

Methods inherited from class java.lang.Object

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

Field Detail

useContextClassLoader

public static boolean useContextClassLoader

Specifies how a java.lang.Class object is loaded.

If true, it is loaded by:

Thread.currentThread().getContextClassLoader().loadClass()

If false, it is loaded by Class.forName(). The default value is false.

Constructor Detail

ClassMetaobject

public ClassMetaobject(java.lang.String[] params)

Constructs a ClassMetaobject.

Parameters:

params - params[0] is the name of the class of the reflective objects.

Method Detail

getJavaClass

public final java.lang.Class getJavaClass()

Obtains the java.lang.Class representing this class.

getName

public final java.lang.String getName()

Obtains the name of this class.

isInstance

public final boolean isInstance(java.lang.Object obj)

Returns true if obj is an instance of this class.

newInstance

public final java.lang.Object newInstance(java.lang.Object[] args)
                                   throws CannotCreateException

Creates a new instance of the class.

Parameters:

args - the arguments passed to the constructor.

Throws:

CannotCreateException

trapFieldRead

public java.lang.Object trapFieldRead(java.lang.String name)

Is invoked when static fields of the base-level class are read and the runtime system intercepts it. This method simply returns the value of the field.

Every subclass of this class should redefine this method.

trapFieldWrite

public void trapFieldWrite(java.lang.String name,
                           java.lang.Object value)

Is invoked when static fields of the base-level class are modified and the runtime system intercepts it. This method simply sets the field to the given value.

Every subclass of this class should redefine this method.

invoke

public static java.lang.Object invoke(java.lang.Object target,
                                      int identifier,
                                      java.lang.Object[] args)
                               throws java.lang.Throwable

Invokes a method whose name begins with methodPrefix "_m_" and the identifier.

Throws:

CannotInvokeException - if the invocation fails.

java.lang.Throwable

trapMethodcall

public java.lang.Object trapMethodcall(int identifier,
                                       java.lang.Object[] args)
                                throws java.lang.Throwable

Is invoked when static methods of the base-level class are called and the runtime system intercepts it. This method simply executes the intercepted method invocation with the original parameters and returns the resulting value.

Every subclass of this class should redefine this method.

Throws:

java.lang.Throwable

getReflectiveMethods

public final java.lang.reflect.Method[] getReflectiveMethods()

Returns an array of the methods defined on the given reflective object. This method is for the internal use only.

getMethodName

public final java.lang.String getMethodName(int identifier)

Returns the name of the method specified by identifier.

getParameterTypes

public final java.lang.Class[] getParameterTypes(int identifier)

Returns an array of Class objects representing the formal parameter types of the method specified by identifier.

getReturnType

public final java.lang.Class getReturnType(int identifier)

Returns a Class objects representing the return type of the method specified by identifier.