Package org.jaxen.expr

Interface Expr

All Superinterfaces:
Serializable
All Known Subinterfaces:
AdditiveExpr, BinaryExpr, EqualityExpr, FilterExpr, FunctionCallExpr, LiteralExpr, LocationPath, LogicalExpr, MultiplicativeExpr, NumberExpr, PathExpr, RelationalExpr, UnaryExpr, UnionExpr, VariableReferenceExpr
All Known Implementing Classes:
DefaultAbsoluteLocationPath, DefaultAdditiveExpr, DefaultAndExpr, DefaultArithExpr, DefaultBinaryExpr, DefaultDivExpr, DefaultEqualityExpr, DefaultEqualsExpr, DefaultExpr, DefaultFilterExpr, DefaultFunctionCallExpr, DefaultGreaterThanEqualExpr, DefaultGreaterThanExpr, DefaultLessThanEqualExpr, DefaultLessThanExpr, DefaultLiteralExpr, DefaultLocationPath, DefaultLogicalExpr, DefaultMinusExpr, DefaultModExpr, DefaultMultiplicativeExpr, DefaultMultiplyExpr, DefaultNotEqualsExpr, DefaultNumberExpr, DefaultOrExpr, DefaultPathExpr, DefaultPlusExpr, DefaultRelationalExpr, DefaultRelativeLocationPath, DefaultTruthExpr, DefaultUnaryExpr, DefaultUnionExpr, DefaultVariableReferenceExpr
public interface Expr extends Serializable
Represents an XPath expression. This is production 14 in the XPath 1.0 specification: 
[14]      Expr       ::=      OrExpr

  • Method Summary

    Modifier and Type
    Method
    Description
    Object
    evaluate(Context context)
    Evaluate the expression in the given context, and return the result.
    String
    getText()
    Returns a String containing the XPath expression.
    Expr
    simplify()
    Simplifies the XPath expression.

  • Method Details

    • getText

      String getText()
      Returns a String containing the XPath expression.
      Returns:
      the text form of this XPath expression

    • simplify

      Expr simplify()
      Simplifies the XPath expression. For example, the expression //para[1 = 1] could be simplified to //para. In practice, this is usually a noop. Jaxen does not currently perform any simplification.
      Returns:
      the simplified expression

    • evaluate

      Object evaluate(Context context) throws JaxenException
      Evaluate the expression in the given context, and return 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