ariba.util.fieldvalue
Class ClassExtensionGetter

java.lang.Object
  ariba.util.fieldvalue.BaseAccessor
      ariba.util.fieldvalue.ReflectionMethodAccessor
          ariba.util.fieldvalue.ReflectionMethodGetter
              ariba.util.fieldvalue.ClassExtensionGetter

All Implemented Interfaces:

FieldValueAccessor, FieldValueGetter

public class ClassExtensionGetter
extends ReflectionMethodGetter

A special FieldValueAccessor subclass which supports the use of the FieldValue subsystem to invoke ClassExtension methods. The main difference between a ClassExtension method and a normal method (implemented on the targetClass proper) is that the first argument of a ClassExtension method is always the targetObject. The ClassExtensionGetter handles this case by invoking the ClassExtension methods with the ClassExtension as the target of the invocation and by passing the actual targte as the first argument in the args array.

Field Summary

Fields inherited from class ariba.util.fieldvalue.ReflectionMethodGetter

EmptyArray

Method Summary

static FieldValueGetter

newInstance(java.lang.Class targetClass, java.lang.String fieldName) Allocate and initialize a new ClassExtensionGetter for the named ClassExtension, the class of the target object, and the name of the field.

Methods inherited from class ariba.util.fieldvalue.ReflectionMethodGetter

getValue, toString

Methods inherited from class ariba.util.fieldvalue.BaseAccessor

forClass, getFieldName, isApplicable

Methods inherited from class java.lang.Object

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

Methods inherited from interface ariba.util.fieldvalue.FieldValueAccessor

forClass, getFieldName, isApplicable

Method Detail

newInstance

public static FieldValueGetter newInstance(java.lang.Class targetClass,
                                           java.lang.String fieldName)

Allocate and initialize a new ClassExtensionGetter for the named ClassExtension, the class of the target object, and the name of the field. This first attempts to locate the appropriate class extension for the given name and target class. If it cannot be found, throws a FieldValueException with an informative message. Otherwise, this will lookup the appropriate getter method for the classExtension and fieldName.

Parameters:

targetClass - the class of the target object

fieldName - the name of the field for which the accessor applies

Returns:

a newly constructed ClassExtensionGetter for getting values