Java Doc for VariableElement.java in  » Inversion-of-Control » JICE » org » jicengine » element » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Inversion of Control » JICE » org.jicengine.element 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.jicengine.element.VariableElement

All known Subclasses:   org.jicengine.element.StaticValueElement,
VariableElement
public interface VariableElement extends Element(Code)

VariableElements are elements that both have a value and let the clients/users decide what to do with the value. The client/user of a VariableElement is typically the parent element.

The latter aspect is an important one. A VariableElement doesn't actually know what to do with the value, it can only create the value. It is the responsibility of the client/user to use the value for something.

VariableElements are usually used for producing parameters of various operations, like the constructor and action operation of an element.

Copyright (C) 2004 Timo Laitinen


author:
   Timo Laitinen
since:
   JICE-0.10




Method Summary
public  ClassgetInstanceClass()
    
public  ObjectgetValue(Context globalContext, Object parentInstance)
    

Creates and returns the value of this element.

The client/user of this element will call this method.




Method Detail
getInstanceClass
public Class getInstanceClass()(Code)



getValue
public Object getValue(Context globalContext, Object parentInstance) throws ElementException(Code)

Creates and returns the value of this element.

The client/user of this element will call this method. currently, the method is called only once. No caching of the result is needed. However, the object should be able to be executed multiple times.

in general, the creation of the value consists of the following steps:

  1. the instance of the element is created first (with parameters)
  2. if the element has other ActionElements as children, they are executed next
  3. the instance is returned.

Parameters:
  globalContext - a Context where the instances marked with the 'id'-attributeare put.
Parameters:
  parentInstance - the instance of the parent element. NOTE: null-value meansthat the value of the parent is not available (not yetor never), not that the instance of the parent is null! the value of the element. the operation can return null!(although that is not currently supported by other parts ozf the framework)
throws:
  ElementException - if any part of the execution of the action fails.



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