Package org.jaxen.expr

Interface Predicate

  • All Superinterfaces:
    Serializable
    public interface Predicate
extends Serializable
    Represents an XPath predicate such as [position() = last()]. This is production 8 and 9 in the XPath 1.0 specification: 
     [8] Predicate     ::= '[' PredicateExpr ']'   
 [9] PredicateExpr ::= Expr

    • Method Detail

      • getExpr

        Expr getExpr()
        Returns the expression in this predicate.
        Returns:
        the expression between the brackets

      • setExpr

        void setExpr​(Expr expr)
        Change the expression used by this predicate.
        Parameters:
        expr - the new expression

      • simplify

        void simplify()
        Simplify the expression in this predicate.
        See Also:
        Expr.simplify()

      • getText

        String getText()
        Returns the string form of the predicate, including the square brackets.
        Returns:
        the bracketed form of this predicate

      • evaluate

        Object evaluate​(Context context)
         throws JaxenException
        Evaluates this predicate's expression and returns the result. The result will be a java.lang.Double for expressions that return a number, a java.lang.String for expressions that return a string, a java.lang.Boolean for expressions that return a boolean, and a java.util.List for expressions that return a node-set. In the latter case, the elements of the list are the actual objects from the source document model. Copies are not made.
        Parameters:
        context - the context in which the expression is evaluated
        Returns:
        an object representing the result of the evaluation
        Throws:
        JaxenException
        See Also:
        Expr.evaluate(Context)