Interface Predicate

  • All Superinterfaces:
    java.io.Serializable

    public interface Predicate
    extends java.io.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 Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      java.lang.Object evaluate​(Context context)
      Evaluates this predicate's expression and returns the result.
      Expr getExpr()
      Returns the expression in this predicate.
      java.lang.String getText()
      Returns the string form of the predicate, including the square brackets.
      void setExpr​(Expr expr)
      Change the expression used by this predicate.
      void simplify()
      Simplify the expression in this predicate.
    • 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

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

        java.lang.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)