Class ParentNodeExpression


  • public class ParentNodeExpression
    extends SingletonExpression
    Class ParentNodeExpression represents the XPath expression ".." or "parent::node()"
    • Constructor Detail

      • ParentNodeExpression

        public ParentNodeExpression()
    • Method Detail

      • 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
      • evaluateAsString

        public java.lang.String evaluateAsString​(Context context)
                                          throws XPathException
        Evaluate as a string. Returns the string value of the parent node
        Overrides:
        evaluateAsString in class SingletonExpression
        Parameters:
        context - The context in which the expression is to be evaluated
        Returns:
        the value of the current node, identified by the context
        Throws:
        XPathException
      • evaluateAsBoolean

        public boolean evaluateAsBoolean​(Context context)
                                  throws XPathException
        Evaluate as a boolean. Returns true if there are any nodes selected by the NodeSetExpression.
        Overrides:
        evaluateAsBoolean in class SingletonExpression
        Parameters:
        context - The context in which the expression is to be evaluated
        Returns:
        true unless the current node is the Document node
        Throws:
        XPathException
      • reduce

        public Expression reduce​(int dependencies,
                                 Context context)
                          throws XPathException
        Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
        Specified by:
        reduce in class Expression
        Parameters:
        dependencies - The dependencies to be removed
        context - The context to be used for the partial evaluation
        Returns:
        a new expression that does not have any of the specified dependencies
        Throws:
        XPathException
      • display

        public void display​(int level)
        Diagnostic print of expression structure
        Specified by:
        display in class Expression