Package org.apache.commons.jxpath.ri.axes

Class SimplePathInterpreter

java.lang.Object

org.apache.commons.jxpath.ri.axes.SimplePathInterpreter

public class SimplePathInterpreter
extends 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 = ...].

Constructor Summary

Constructors

Constructor	Description
SimplePathInterpreter()	Deprecated. Will be private in the next major version.

Method Summary

Modifier and Type	Method	Description
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, Expression[] 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, Step[] steps)	Interpret a simple path that starts with the given root and follows the given steps.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SimplePathInterpreter

@Deprecated
public SimplePathInterpreter()

Deprecated.

Will be private in the next major version.

Constructs a new instance.

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.

Parameters:

context - evaluation context

parent - parent pointer

steps - path steps

currentStep - step number

Returns:

NodePointer

interpretSimpleExpressionPath

public static NodePointer interpretSimpleExpressionPath(EvalContext context,
 NodePointer root,
 Expression[] 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.

Parameters:

context - evaluation context

root - root pointer

predicates - predicates corresponding to steps

steps - path steps

Returns:

NodePointer

interpretSimpleLocationPath

public static NodePointer interpretSimpleLocationPath(EvalContext context,
 NodePointer root,
 Step[] 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.

Parameters:

context - evaluation context

root - root pointer

steps - path steps

Returns:

NodePointer