org.apache.commons.jxpath.ri.axes

Class SimplePathInterpreter


public class SimplePathInterpreter
extends java.lang.Object

An evaluation mechanism for simple XPaths, which is much faster than the usual process. It is only used for xpaths which have no context-dependent parts, consist entirely of child::name and self::node() steps with predicates that either integer or have the form [@name = ...].
Version:
$Revision: 1.10 $ $Date: 2002/04/24 04:05:40 $
Author:
Dmitri Plotnikov

Method Summary

static NodePointer
createNullPointer(EvalContext context, NodePointer parent, Step[] steps, int currentStep)
Creates a "null pointer" that a) represents the requested path and b) can be used for creation of missing nodes in the path.
static NodePointer
interpretSimpleExpressionPath(EvalContext context, NodePointer root, predicates[] , Step[] steps)
Interpret the steps of a simple expression path that starts with the given root, which is the result of evaluation of the root expression of the expression path, applies the given predicates to it and then follows the given steps.
static NodePointer
interpretSimpleLocationPath(EvalContext context, NodePointer root, steps[] )
Interpret a simple path that starts with the given root and follows the given steps.

Method Details

createNullPointer

public static NodePointer createNullPointer(EvalContext context,
                                            NodePointer parent,
                                            Step[] steps,
                                            int currentStep)
Creates a "null pointer" that a) represents the requested path and b) can be used for creation of missing nodes in the path.

interpretSimpleExpressionPath

public static NodePointer interpretSimpleExpressionPath(EvalContext context,
                                                        NodePointer root,
                                                        predicates[] ,
                                                        Step[] steps)
Interpret the steps of a simple expression path that starts with the given root, which is the result of evaluation of the root expression of the expression path, applies the given predicates to it and then follows the given steps. All steps must have the axis "child::" or "attribute::" and a name test. They can also optionally have predicates of type [@name=...] or simply [...] interpreted as an index.

interpretSimpleLocationPath

public static NodePointer interpretSimpleLocationPath(EvalContext context,
                                                      NodePointer root,
                                                      steps[] )
Interpret a simple path that starts with the given root and follows the given steps. All steps must have the axis "child::" and a name test. They can also optionally have predicates of type [@name=expression] or simply [expression] interpreted as an index.