net.sf.joost.stx
Class FunctionTable.ExtensionFunction

java.lang.Object
  net.sf.joost.stx.FunctionTable.ExtensionFunction

All Implemented Interfaces:

FunctionTable.Instance

Enclosing class:

FunctionTable

public static final class FunctionTable.ExtensionFunction

extends Object

implements FunctionTable.Instance

An instance of this class represents a Java extension function. Parts of this code are taken from Michael Kay's Saxon XSLT processor implementation.

Field Summary

private ArrayList	candidateMethods possible methods, should differ at most in formal parameter types
private boolean	isConstructor true if this function call is a constructor invocation
private int	paramCount the number of provided parameters in the function call
private Class	targetClass the target class, identified by the namespace

Constructor Summary

FunctionTable.ExtensionFunction(String className, String lName, Tree args, Locator locator)
Constructs a Java extension function.

Method Summary

Value	evaluate(Context context, int top, Tree args) find and call the correct Java method
int	getMaxParCount() Not called
int	getMinParCount() Not called
String	getName() Not called

Methods inherited from class java.lang.Object

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

Field Detail

targetClass

private Class targetClass

the target class, identified by the namespace

candidateMethods

private ArrayList candidateMethods

possible methods, should differ at most in formal parameter types

paramCount

private int paramCount

the number of provided parameters in the function call

isConstructor

private boolean isConstructor

true if this function call is a constructor invocation

Constructor Detail

FunctionTable.ExtensionFunction

public FunctionTable.ExtensionFunction(String className,
                                       String lName,
                                       Tree args,
                                       Locator locator)
                                throws SAXParseException

Constructs a Java extension function.

Parameters:

className - the name of the Java class the function belongs to (taken from the namespace URI of the function call)

lName - the local name of the function call (may contain hyphens)

args - the supplied function parameters

locator - the Locator object

Throws:

SAXParseException - if there's no proper function

Method Detail

evaluate

public Value evaluate(Context context,
                      int top,
                      Tree args)
               throws SAXException,
                      EvalException

find and call the correct Java method

Specified by:

evaluate in interface FunctionTable.Instance

Parameters:

context - the Context object

top - the number of the upper most element on the stack

args - the current parameters

Returns:

a Value instance containing the result

Throws:

EvalException - if an error occurs while processing

SAXException - if an error occurs while processing

getMinParCount

public int getMinParCount()

Not called

Specified by:

getMinParCount in interface FunctionTable.Instance

getMaxParCount

public int getMaxParCount()

Not called

Specified by:

getMaxParCount in interface FunctionTable.Instance

getName

public String getName()

Not called

Specified by:

getName in interface FunctionTable.Instance