org.formaria.builder.generic
Class GenericBuilderAttributeEvaluator

java.lang.Object
  org.formaria.aria.evaluator.DefaultAttributeEvaluator
      org.formaria.builder.generic.GenericBuilderAttributeEvaluator

All Implemented Interfaces:

AttributeEvaluator

public class GenericBuilderAttributeEvaluator
extends DefaultAttributeEvaluator

An attribute evaluator. This attribute evaluator extends the default evaluator by adding support for the ${values},${value} arguments. The evaluator also support mapping of attributes through the attribute names specified as ${attribName}.

The attributes can also be defined in classes other than the current page or classes derived from Page. The syntax for such expressions is as follows:

• 1. ${mypackage.MyClass[referenceName].myMethod(args...)} for a named object instance
• 2. ${mypackage.MyClass[].myMethod(args...)} to create a new instance of the class on each evaluation
• 3. ${mypackage.MyClass.myMethod(args...)} to invoke a static method
• 4. ${myMethod[referenceName](args...)} for a method contained with the invoking page
• 5. ${this[componentName].componentMethod(args...)} for a method contained within named component
• 6. ${this.method(args...)} for a method contained within the enclosing page, identical to 4 above
• 7. ${project.method(args...)} for a method contained within the project
• 8. ${comp.method(args...)} for a method contained within the component
• 9. ${this} for a reference to the page
• 10. ${comp} for a reference to the component
• 11. ${value} for a reference to the named argument value
• 12. ${values} for a reference to the named argument values

where mypackage is the name of the Java package containing the class MyClass. The value of referenceName is a user defined value that identifies the instance of the class. The application instantiates an instance of the class when the expression is first encountered and thereafter maintains the instance with each subsequent call retrieving the same instance of the class.

Copyright (c) Formaria Ltd., 2001-2008, This software is licensed under the GNU Public License (GPL), please see license.txt for more details. If you make commercial use of this software you must purchase a commercial license from Formaria.

Field Summary

Fields inherited from class org.formaria.aria.evaluator.DefaultAttributeEvaluator

classInstances, currentProject, exceptionHandler, provider, result

Constructor Summary

GenericBuilderAttributeEvaluator(Project project)
Create a new evaluator

Method Summary

java.lang.Object	evaluateAttribute(java.awt.Component comp, java.lang.String methodSpec, java.lang.String attribValue, XmlElement childNode) Invoke the specified method
PageSupport	getPage() Get the page that this evaluator is operating upon
protected java.lang.Object	lookupReference(java.lang.String reference) Lookup a reference
void	setPage(PageSupport p) Set the page upon which this component operates

Methods inherited from class org.formaria.aria.evaluator.DefaultAttributeEvaluator

evaluateAttribute, getMethodReference, getMethodReference, getObject, getResult, setCurrentProject, setExceptionHandler, setResult

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericBuilderAttributeEvaluator

public GenericBuilderAttributeEvaluator(Project project)

Create a new evaluator

Parameters:

currentProject - the current project

project - the current or owning project

Method Detail

evaluateAttribute

public java.lang.Object evaluateAttribute(java.awt.Component comp,
                                          java.lang.String methodSpec,
                                          java.lang.String attribValue,
                                          XmlElement childNode)

Invoke the specified method

Parameters:

attribValue - the value of the attribute.

childNode - the source xml node

getPage

public PageSupport getPage()

Get the page that this evaluator is operating upon

Returns:

the page or null if none was set

setPage

public void setPage(PageSupport p)

Set the page upon which this component operates

Parameters:

p - the page

lookupReference

protected java.lang.Object lookupReference(java.lang.String reference)

Lookup a reference

Overrides:

lookupReference in class DefaultAttributeEvaluator

Parameters:

reference - a stripped reference e.g. values - which would have been specified as ${values}

Returns:

the reference object(s) or null