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

Class RootContext

java.lang.Object

org.apache.commons.jxpath.ri.EvalContext

org.apache.commons.jxpath.ri.axes.RootContext

All Implemented Interfaces:

java.util.Iterator, ExpressionContext

public class RootContext
extends EvalContext

EvalContext that is used to hold the root node for the path traversal.

Version:

$Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $

Field Summary

Fields

Modifier and Type	Field	Description
private int	availableRegister
private JXPathContextReferenceImpl	jxpathContext
private static int	MAX_REGISTER
private NodePointer	pointer
private java.lang.Object[]	registers
static java.lang.Object	UNKNOWN_VALUE

Fields inherited from class org.apache.commons.jxpath.ri.EvalContext

parentContext, position, rootContext

Constructor Summary

Constructors

Constructor	Description
RootContext(JXPathContextReferenceImpl jxpathContext, NodePointer pointer)	Create a new RootContext.

Method Summary

Modifier and Type	Method	Description
EvalContext	getAbsoluteRootContext()	Get absolute root context
EvalContext	getConstantContext(java.lang.Object constant)	Get a context that points to the specified object.
NodePointer	getCurrentNodePointer()	Returns the current context node.
int	getCurrentPosition()	Get the current position.
Function	getFunction(QName functionName, java.lang.Object[] parameters)	Get the specified function from the context.
JXPathContext	getJXPathContext()	Get the JXPathContext in which this function is being evaluated.
java.lang.Object	getRegisteredValue(int id)	Get a registered value.
RootContext	getRootContext()	Returns the root context of the path, which provides easy access to variables and functions.
java.lang.Object	getValue()	Typically returns the NodeSet by calling getNodeSet(), but will be overridden for contexts that more naturally produce individual values, e.g.
EvalContext	getVariableContext(QName variableName)	Get variable context.
boolean	nextNode()	Returns true if there is another object in the current set.
boolean	nextSet()	Returns true if there is another sets of objects to interate over.
boolean	setPosition(int position)	Moves the current position to the specified index.
int	setRegisteredValue(java.lang.Object value)	Set the next registered value.
java.lang.String	toString()

Methods inherited from class org.apache.commons.jxpath.ri.EvalContext

getContextNodeList, getContextNodePointer, getDocumentOrder, getNodeSet, getPosition, getSingleNodePointer, hasNext, isChildOrderingRequired, next, remove, reset, sortPointers

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Detail

jxpathContext

private JXPathContextReferenceImpl jxpathContext

pointer

private NodePointer pointer

registers

private java.lang.Object[] registers

availableRegister

private int availableRegister

UNKNOWN_VALUE

public static final java.lang.Object UNKNOWN_VALUE

MAX_REGISTER

private static final int MAX_REGISTER

See Also:

Constant Field Values

Constructor Detail

RootContext

public RootContext(JXPathContextReferenceImpl jxpathContext,
                   NodePointer pointer)

Create a new RootContext.

Parameters:

jxpathContext - context

pointer - pointer

Method Detail

getJXPathContext

public JXPathContext getJXPathContext()

Description copied from interface: ExpressionContext

Get the JXPathContext in which this function is being evaluated.

Specified by:

getJXPathContext in interface ExpressionContext

Overrides:

getJXPathContext in class EvalContext

Returns:

A list representing the current context nodes.

getRootContext

public RootContext getRootContext()

Description copied from class: EvalContext

Returns the root context of the path, which provides easy access to variables and functions.

Overrides:

getRootContext in class EvalContext

Returns:

RootContext

getAbsoluteRootContext

public EvalContext getAbsoluteRootContext()

Get absolute root context

Returns:

EvalContext

getCurrentNodePointer

public NodePointer getCurrentNodePointer()

Description copied from class: EvalContext

Returns the current context node. Undefined before the beginning of the iteration.

Specified by:

getCurrentNodePointer in class EvalContext

Returns:

NodePoiner

getValue

public java.lang.Object getValue()

Description copied from class: EvalContext

Typically returns the NodeSet by calling getNodeSet(), but will be overridden for contexts that more naturally produce individual values, e.g. VariableContext

Overrides:

getValue in class EvalContext

Returns:

Object

getCurrentPosition

public int getCurrentPosition()

Description copied from class: EvalContext

Get the current position.

Overrides:

getCurrentPosition in class EvalContext

Returns:

int position.

nextNode

public boolean nextNode()

Description copied from class: EvalContext

Returns true if there is another object in the current set. Switches the current position and node to the next object.

Specified by:

nextNode in class EvalContext

Returns:

boolean

nextSet

public boolean nextSet()

Description copied from class: EvalContext

Returns true if there is another sets of objects to interate over. Resets the current position and node.

Overrides:

nextSet in class EvalContext

Returns:

boolean

setPosition

public boolean setPosition(int position)

Description copied from class: EvalContext

Moves the current position to the specified index. Used with integer predicates to quickly get to the n'th element of the node set. Returns false if the position is out of the node set range. You can call it with 0 as the position argument to restart the iteration.

Overrides:

setPosition in class EvalContext

Parameters:

position - to set

Returns:

boolean

getConstantContext

public EvalContext getConstantContext(java.lang.Object constant)

Get a context that points to the specified object.

Parameters:

constant - object

Returns:

EvalContext

getVariableContext

public EvalContext getVariableContext(QName variableName)

Get variable context.

Parameters:

variableName - variable name

Returns:

EvalContext

getFunction

public Function getFunction(QName functionName,
                            java.lang.Object[] parameters)

Get the specified function from the context.

Parameters:

functionName - QName

parameters - Object[]

Returns:

Function

getRegisteredValue

public java.lang.Object getRegisteredValue(int id)

Get a registered value.

Parameters:

id - int

Returns:

Object

setRegisteredValue

public int setRegisteredValue(java.lang.Object value)

Set the next registered value.

Parameters:

value - Object

Returns:

the id that can reclaim value.

toString

public java.lang.String toString()

Overrides:

toString in class EvalContext