Package net.sf.saxon.functions

Class SystemProperty

java.lang.Object
net.sf.saxon.expr.Expression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.SystemProperty
All Implemented Interfaces:
Serializable, SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, SequenceIterable, XSLTFunction, InstructionInfo, Locator
public class SystemProperty extends SystemFunction implements XSLTFunction
Implementation of the XSLT system-property() function
See Also:

  • Constructor Details

    • SystemProperty

      public SystemProperty()

  • Method Details

    • checkArguments

      public void checkArguments(ExpressionVisitor visitor) throws XPathException
      Description copied from class: SystemFunction
      Method called during static type checking
      Overrides:
      checkArguments in class SystemFunction
      Parameters:
      visitor - the expression visitor
      Throws:
      XPathException

    • preEvaluate

      public Expression preEvaluate(ExpressionVisitor visitor) throws XPathException
      preEvaluate: this method performs compile-time evaluation for properties in the XSLT namespace only
      Overrides:
      preEvaluate in class FunctionCall
      Parameters:
      visitor - an expression visitor
      Returns:
      the result of the early evaluation, or the original expression, or potentially a simplified expression
      Throws:
      XPathException

    • evaluateItem

      public Item evaluateItem(XPathContext context) throws XPathException
      Evaluate the function at run-time
      Specified by:
      evaluateItem in interface EvaluableItem
      Overrides:
      evaluateItem in class Expression
      Parameters:
      context - The context in which the expression is to be evaluated
      Returns:
      the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence
      Throws:
      XPathException - if any dynamic error occurs evaluating the expression

    • getProperty

      public static String getProperty(String uri, String local, Configuration config)
      Here's the real code:
      Parameters:
      uri - the namespace URI of the system property name
      local - the local part of the system property name
      config - the Saxon configuration
      Returns:
      the value of the corresponding system property