com.icl.saxon.functions

Class SystemProperty

java.lang.Object

com.icl.saxon.expr.Expression

com.icl.saxon.expr.Function

com.icl.saxon.functions.SystemProperty

public class SystemProperty
extends Function

Field Summary

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

argument

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

staticContext

Constructor Summary

Constructors

Constructor and Description
SystemProperty()

Method Summary

Methods

Modifier and Type	Method and Description
Value	evaluate(Context context) Evaluate the function
int	getDataType() Determine the data type of the expression
int	getDependencies() Get dependencies
String	getName() Get the name of the function.
static Value	getProperty(String uri, String local) Here's the real code:
Expression	reduce(int dep, Context c) Remove dependencies
Expression	simplify() Validate and simplify

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

SystemProperty

public SystemProperty()

Method Detail

getName

public String getName()

Description copied from class: Function

Get the name of the function. This method must be implemented in all subclasses.

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

Specified by:

getDataType in class Expression

Returns:

Value.ANY (meaning not known in advance)

simplify

public Expression simplify()
                    throws XPathException

Validate and simplify

Overrides:

simplify in class Expression

Returns:

the simplified expression

Throws:

XPathException

evaluate

public Value evaluate(Context context)
               throws XPathException

Evaluate the function

Specified by:

evaluate in class Expression

Parameters:

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

Returns:

the value of the expression, evaluated in the current context

Throws:

XPathException

getProperty

public static Value getProperty(String uri,
                String local)

Here's the real code:

getDependencies

public int getDependencies()

Get dependencies

Specified by:

getDependencies in class Expression

reduce

public Expression reduce(int dep,
                Context c)
                  throws XPathException

Remove dependencies

Specified by:

reduce in class Expression

Parameters:

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

c - 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