Class NodeSetComparison


  • public class NodeSetComparison
    extends Expression
    NodeSetComparison: A Relational Expression that compares a node-set with a string or numeric value for equals, not-equals, greater-than or less-than.
    • Method Detail

      • simplify

        public Expression simplify()
        Simplify an expression
        Overrides:
        simplify in class Expression
        Returns:
        the simplified expression
      • evaluate

        public Value evaluate​(Context c)
                       throws XPathException
        Evaluate the expression in a given context
        Specified by:
        evaluate in class Expression
        Parameters:
        c - the given context for evaluation
        Returns:
        a BooleanValue representing the result of the comparison of the two operands
        Throws:
        XPathException
      • evaluateAsBoolean

        public boolean evaluateAsBoolean​(Context c)
                                  throws XPathException
        Evaluate the expression in a given context
        Overrides:
        evaluateAsBoolean in class Expression
        Parameters:
        c - the given context for evaluation
        Returns:
        a boolean representing the result of the numeric comparison of the two operands
        Throws:
        XPathException
      • getDataType

        public int getDataType()
        Determine the data type of the expression, if possible
        Specified by:
        getDataType in class Expression
        Returns:
        Value.BOOLEAN
      • 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
        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