Package com.singularsys.extensions.mathml.parser

Class SpecialFunctionHandler

java.lang.Object

com.singularsys.extensions.mathml.parser.SpecialFunctionHandler

All Implemented Interfaces:

TagHandler

Direct Known Subclasses:

LogHandler, MinusHandler, RootHandler, SelectorHandler

public abstract class SpecialFunctionHandler
extends Object
implements TagHandler

Base class for functions and operators which have special arguments. For example <root> may have a <degree> element as its first child.

Author:

Richard Morris

Constructor Summary

Constructors

Constructor	Description
SpecialFunctionHandler()

Method Summary

Modifier and Type	Method	Description
abstract Node	apply(ApplyHandler ah, StackFrame frame, Locator loc)	Called when closing <apply/> tag is encountered.
Object	handle(StackFrame frame, Locator loc)	Returns 'this'.

Methods inherited from class java.lang.Object

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

Constructor Details

SpecialFunctionHandler

public SpecialFunctionHandler()

Method Details

apply

public abstract Node apply(ApplyHandler ah,
 StackFrame frame,
 Locator loc)
                    throws SAXParseException,
ParseException

Called when closing <apply/> tag is encountered.

Parameters:

ah - a reference to the ApplyHandler which provides some useful methods.

frame - the stackframe for the "apply" element, the children can be recovered from this

loc - provides information on the location in the xml document.

Returns:

the resulting Node representing the function.

Throws:

SAXParseException

ParseException

handle

public Object handle(StackFrame frame,
 Locator loc)

Returns 'this'.

Specified by:

handle in interface TagHandler

Parameters:

frame - StackFrame representing the element

loc - location in input

Returns:

typically a Node, other types of objects may also be returned when the tag has a special meaning for its parent node.