cookxml.cookjython.creator
Class JythonCreator

java.lang.Object
  cookxml.cookjython.creator.JythonCreator

All Implemented Interfaces:

Creator

public class JythonCreator

extends Object

implements Creator

This class creates a Jython Interpreter instance and use it to interpret code within the tag. Currently, it supports three optional attributes:

• return="variable", useful if you intend to read an object from jython interpreter
• class="java class name", useful only when the object obtained from jython interpreter could not be converted to the correct Java class. In most cases, it is not needed.
• src="uri for the external python code", useful when you want to load source code from a resource

This code depends on TextCreator of CookXml's common component to load source code from a resource.

Since:

CookJython 1.0

See Also:

PythonInterpreter, CookJythonIdMap, TextCreator.readText(String)

Field Summary

static String	CLASS_ATTR
static String	RETURN_ATTR
static String	SRC_ATTR

Method Summary

Object	create(String parentTag, Element elm, Object parentObj, String value, DecodeEngine decodeEngine) This function is called whenever decodeEngine starts processing an element.
Object	editFinished(String parentTag, Element elm, Object parentObj, Object obj, DecodeEngine decodeEngine) This function is called when the element and its subnodes have all been processed. and about to be returned.
static Creator	getInstance()

Methods inherited from class java.lang.Object

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

Field Detail

SRC_ATTR

public static final String SRC_ATTR

See Also:

Constant Field Values

RETURN_ATTR

public static final String RETURN_ATTR

See Also:

Constant Field Values

CLASS_ATTR

public static final String CLASS_ATTR

See Also:

Constant Field Values

Method Detail

getInstance

public static Creator getInstance()

create

public Object create(String parentTag,
                     Element elm,
                     Object parentObj,
                     String value,
                     DecodeEngine decodeEngine)
              throws CreatorException

Description copied from interface: Creator

This function is called whenever decodeEngine starts processing an element. It should return an object that corresponds to the tag, or null to indicate no object could be created. If the object returned is of NoAdd type, then the object is not added to the parent object by decodeEngine.

There can be creative use of this function. For example, one could create another instance of CookXml that process the element differently, then call this instanceof decodeEngine to add the processed object to the parent, and then return null to tell this instance of decodeEngine/CookXml to stop processing the element.

Specified by:

create in interface Creator

Parameters:

parentTag - the parent tag that contains this element

elm - the DOM element that contains all the information regarding this node.

parentObj - the parent object in the node

value - the string value specified in the constructor field

decodeEngine - the decode engine that is being used

Returns:

the object created, or null to tell decodeEngine to stop processing this node

Throws:

CreatorException

editFinished

public Object editFinished(String parentTag,
                           Element elm,
                           Object parentObj,
                           Object obj,
                           DecodeEngine decodeEngine)
                    throws CookXmlException

Description copied from interface: Creator

This function is called when the element and its subnodes have all been processed. and about to be returned. For many helper objects that implement NoAdd, this is a great time to generate the real object and call the decodeEngine.addChild to add the real object to the parent.

Specified by:

editFinished in interface Creator

Parameters:

parentTag - the parent element tag

elm - the DOM element that contains all the information regarding this node.

parentObj - the parent object of the parent element

obj - the object that was created by this create function

decodeEngine - the decode engine that is being used.

Returns:

the object. The purpose is to allow a helper object to return the real object.

Throws:

CookXmlException