Java Doc for CalculatedFieldAlgorithm.java in » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » forms » formmodel » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.forms.formmodel

Source Cross Reference

Class Diagram

Java Document (Java Doc)

org.apache.cocoon.forms.formmodel .CalculatedFieldAlgorithm

All known Subclasses:   org.apache.cocoon.forms.formmodel.algorithms .AbstractBaseAlgorithm,  org.apache.cocoon.forms.formmodel.algorithms .JavaScript,
CalculatedFieldAlgorithm
public interface CalculatedFieldAlgorithm (Code)
Common interface for an algorithm to calculate the value of a org.apache.cocoon.forms.formmodel.CalculatedField .
version:
   $Id: CalculatedFieldAlgorithm.java 449149 2006-09-23 03:58:05Z crossley $

Method Summary
public Object calculate(Form form, Widget parent, Datatype datatype)
     Performs the actual calculation.
Parameters:
  form - The form.
Parameters:
  parent - The parent widget of the CalculatedField widget (may be the same as form)
Parameters:
  datatype - The target datatype.
public Iterator getTriggerWidgets()
     Returns an iterator on trigger widget paths.
public boolean isSuitableFor(Datatype dataType)
     Checks wether this algorithm is able to return the given datatype.

Method Detail
calculate
public Object calculate(Form form, Widget parent, Datatype datatype)(Code)
Performs the actual calculation.
Parameters:
  form - The form.
Parameters:
  parent - The parent widget of the CalculatedField widget (may be the same as form)
Parameters:
  datatype - The target datatype. the calculated value for the CalculatedField.

getTriggerWidgets
public Iterator getTriggerWidgets()(Code)
Returns an iterator on trigger widget paths. When the value of a trigger widget changes, then the CalculatedField value must be recalculated. An iterator of Strings representing widget paths as interpreted by org.apache.cocoon.forms.util.WidgetFinder.

isSuitableFor
public boolean isSuitableFor(Datatype dataType)(Code)
Checks wether this algorithm is able to return the given datatype. For example, an arithmetic algorithm like sum should check that the given datatype is a number.
Parameters:
  dataType - The target datatype. true if this algorithm can return a compatible value, false otherwise.

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