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 Summary

    Modifier and Type
    Method
    Description
    Object
    evaluate(Context context)
    Evaluates this predicate's expression and returns the result.
    Expr
    getExpr()
    Returns the expression in this predicate.
    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 Details

    • 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:

    • 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: