org.apache.commons.jxpath.ri.compiler
Class Path

java.lang.Object
  |
  +--org.apache.commons.jxpath.ri.compiler.Expression
        |
        +--org.apache.commons.jxpath.ri.compiler.Path

Direct Known Subclasses:

ExpressionPath, LocationPath

public abstract class Path

extends Expression

Version:

$Revision: 1.9 $ $Date: 2003/03/11 00:59:22 $

Author:

Dmitri Plotnikov

Inner classes inherited from class org.apache.commons.jxpath.ri.compiler.Expression

Expression.PointerIterator, Expression.ValueIterator

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression

NOT_A_NUMBER, ONE, ZERO

Constructor Summary

Path(Step[] steps)

Method Summary

protected boolean	areBasicPredicates(Expression[] predicates)
boolean	computeContextDependent() Implemented by subclasses and result is cached by isContextDependent()
protected EvalContext	createContextForStep(EvalContext context, int axis, NodeTest nodeTest) Different axes are serviced by different contexts.
protected EvalContext	evalSteps(EvalContext context) Given a root context, walks a path therefrom and builds a context that contains all nodes matching the path.
protected Pointer	getSingleNodePointerForSteps(EvalContext context) Given a root context, walks a path therefrom and finds the pointer to the first element matching the path.
Step[]	getSteps()
boolean	isSimplePath() Recognized paths formatted as foo/bar[3]/baz[@name = 'biz'] .

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression

compute, computeValue, isContextDependent, iterate, iteratePointers

Methods inherited from class java.lang.Object

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

Constructor Detail

Path

public Path(Step[] steps)

Method Detail

getSteps

public Step[] getSteps()

computeContextDependent

public boolean computeContextDependent()

Description copied from class: Expression

Implemented by subclasses and result is cached by isContextDependent()

Overrides:

computeContextDependent in class Expression

isSimplePath

public boolean isSimplePath()

Recognized paths formatted as foo/bar[3]/baz[@name = 'biz'] . The evaluation of such "simple" paths is optimized and streamlined.

areBasicPredicates

protected boolean areBasicPredicates(Expression[] predicates)

getSingleNodePointerForSteps

protected Pointer getSingleNodePointerForSteps(EvalContext context)

Given a root context, walks a path therefrom and finds the pointer to the first element matching the path.

evalSteps

protected EvalContext evalSteps(EvalContext context)

Given a root context, walks a path therefrom and builds a context that contains all nodes matching the path.

createContextForStep

protected EvalContext createContextForStep(EvalContext context,
                                           int axis,
                                           NodeTest nodeTest)

Different axes are serviced by different contexts. This method allocates the right context for the supplied step.