com.icl.saxon.expr
Class StyleSheetFunctionCall

java.lang.Object
  com.icl.saxon.expr.Expression
      com.icl.saxon.expr.Function
          com.icl.saxon.expr.StyleSheetFunctionCall

public class StyleSheetFunctionCall

extends Function

This class represents a call to a function defined in the stylesheet

Field Summary

Fields inherited from class com.icl.saxon.expr.Function

argument

Fields inherited from class com.icl.saxon.expr.Expression

staticContext

Constructor Summary

StyleSheetFunctionCall()

Method Summary

Value	evaluate(Context c) Evaluate the function
int	getDataType() Determine the data type of the expression, if possible
int	getDependencies() Determine which aspects of the context the expression depends on.
java.lang.String	getName() Get the name of the function.
Expression	reduce(int dependencies, Context context) Remove dependencies.
void	setFunction(SAXONFunction f) Create the reference to the saxon:function element
Expression	simplify() Simplify the function call

Methods inherited from class com.icl.saxon.expr.Function

addArgument, checkArgumentCount, display, getNumberOfArguments

Methods inherited from class com.icl.saxon.expr.Expression

containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

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

Constructor Detail

StyleSheetFunctionCall

public StyleSheetFunctionCall()

Method Detail

setFunction

public void setFunction(SAXONFunction f)

Create the reference to the saxon:function element

getName

public java.lang.String getName()

Get the name of the function.

Specified by:

getName in class Function

Returns:

the name of the function, as used in XSL expressions, but excluding its namespace prefix

getDataType

public int getDataType()

Determine the data type of the expression, if possible

Specified by:

getDataType in class Expression

Returns:

Value.ANY (meaning not known in advance)

simplify

public Expression simplify()
                    throws XPathException

Simplify the function call

Overrides:

simplify in class Expression

Returns:

the simplified expression

Throws:

XPathException

getDependencies

public int getDependencies()

Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE

Specified by:

getDependencies in class Expression

reduce

public Expression reduce(int dependencies,
                         Context context)
                  throws XPathException

Remove dependencies.

Specified by:

reduce in class Expression

Parameters:

dependencies - The dependencies to be removed, e.g. Context.VARIABLES

context - The context to be used for the partial evaluation

Returns:

a new expression (or Value) that does not have any of the specified dependencies

Throws:

XPathException

evaluate

public Value evaluate(Context c)
               throws XPathException

Evaluate the function

Specified by:

evaluate in class Expression

Parameters:

c - The context in which the expression is to be evaluated

Returns:

a Value representing the result of the function. This must be of the data type corresponding to the result of getType().

Throws:

XPathException - if the function cannot be evaluated.