org.inria.ns.reflex.xml.xpath.xpointer
Class ElementScheme

java.lang.Object
  org.inria.ns.reflex.xml.CompiledExpression.Impl
      org.inria.ns.reflex.xml.xpath.xpointer.ElementScheme

All Implemented Interfaces:

CompiledExpression, SchemeBased, XPointer

public class ElementScheme
extends CompiledExpression.Impl
implements XPointer, SchemeBased

The implementation of the XPointer element() scheme.

A valid expression is composed of an optional ID and an optional child sequence. One of them must be present.

Author:

Philippe Poulard

Nested Class Summary

Nested classes/interfaces inherited from interface org.inria.ns.reflex.xml.CompiledExpression

CompiledExpression.Impl

Constructor Summary

ElementScheme(String schemeData, XFactory factory)
Create a new XPointer expression.

Method Summary

Pattern	asPattern() Return this expression as a pattern
Object	evaluate(XPathContext context) Select the element pointed by this expression.
int[]	getChildSequence() Return the child sequence defined by this expression.
String	getId() Return the ID part of this expression.
QName	getSchemeName() Return the name of this scheme.

Methods inherited from class org.inria.ns.reflex.xml.CompiledExpression.Impl

getXFactory

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.inria.ns.reflex.xml.CompiledExpression

getXFactory

Constructor Detail

ElementScheme

public ElementScheme(String schemeData,
                     XFactory factory)
              throws XPointerSyntaxException

Create a new XPointer expression.

Parameters:

schemeData - The scheme data is like "id/1/2/3".

factory - The factory that has created this binding.

Throws:

XPointerSyntaxException - When the scheme datas can't be parsed.

Method Detail

getSchemeName

public QName getSchemeName()

Return the name of this scheme.

Specified by:

getSchemeName in interface SchemeBased

Returns:

"element".

See Also:

XMLNames.ELEMENT_XPOINTER_SCHEME, SchemeBased.getSchemeName()

evaluate

public Object evaluate(XPathContext context)
                throws XPathException

Select the element pointed by this expression.

Specified by:

evaluate in interface CompiledExpression

Parameters:

context - The context : a node set with the position of the object where to start evaluating.

Returns:

The non-null element.

Throws:

XPathException

See Also:

CompiledExpression.evaluate(org.inria.ns.reflex.xml.xpath.XPathContext)

getId

public String getId()

Return the ID part of this expression.

Returns:

The ID or null.

getChildSequence

public int[] getChildSequence()

Return the child sequence defined by this expression.

Returns:

An array of child sequences, or null.

asPattern

public Pattern asPattern()
                  throws BadPatternException

Return this expression as a pattern

Specified by:

asPattern in interface CompiledExpression

Returns:

This expression as a pattern.

Throws:

BadPatternException - If this expression can't be converted to a pattern.

See Also:

CompiledExpression.asPattern()