org.apache.xpath.axes

Class OneStepIteratorForward

java.lang.Object

org.apache.xpath.Expression

org.apache.xpath.patterns.NodeTest

org.apache.xpath.axes.PredicatedNodeTest

org.apache.xpath.axes.LocPathIterator

org.apache.xpath.axes.BasicTestIterator

org.apache.xpath.axes.ChildTestIterator

org.apache.xpath.axes.OneStepIteratorForward

All Implemented Interfaces:

Serializable, Cloneable, SourceLocator, DTMIterator, PathComponent, SubContextList, ExpressionNode, XPathVisitable

Direct Known Subclasses:

KeyIterator

public class OneStepIteratorForward
extends ChildTestIterator

This class implements a general iterator for those LocationSteps with only one step, and perhaps a predicate, that only go forward (i.e. it can not be used with ancestors, preceding, etc.)

See Also:

org.apache.xpath.axes#ChildTestIterator, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int	m_axis The traversal axis from where the nodes will be filtered.

Fields inherited from class org.apache.xpath.axes.ChildTestIterator

m_traverser

Fields inherited from class org.apache.xpath.axes.LocPathIterator

m_allowDetach, m_cdtm, m_clones, m_context, m_currentContextNode, m_execContext, m_lastFetched, m_length, m_pos

Fields inherited from class org.apache.xpath.axes.PredicatedNodeTest

m_foundLast, m_lpi, m_predCount, m_proximityPositions

Fields inherited from class org.apache.xpath.patterns.NodeTest

m_name, m_whatToShow, SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_OTHER, SCORE_QNAME, SHOW_BYFUNCTION, SUPPORTS_PRE_STRIPPING, WILD

Fields inherited from interface org.apache.xml.dtm.DTMIterator

FILTER_ACCEPT, FILTER_REJECT, FILTER_SKIP

Constructor Summary

Constructors

Constructor and Description
OneStepIteratorForward(int axis) Create a OneStepIterator object that will just traverse the self axes.

Method Summary

Modifier and Type	Method and Description
boolean	deepEquals(Expression expr) Compare this object with another object and see if they are equal, include the sub heararchy.
int	getAxis() Returns the axis being iterated, if it is known.
protected int	getNextNode() Get the next node via getFirstAttribute && getNextAttribute.
void	setRoot(int context, Object environment) Initialize the context values for this expression after it is cloned.

Methods inherited from class org.apache.xpath.axes.ChildTestIterator

cloneWithReset, detach

Methods inherited from class org.apache.xpath.axes.BasicTestIterator

nextNode

Methods inherited from class org.apache.xpath.axes.LocPathIterator

allowDetachToRelease, asIterator, asNode, bool, callVisitors, execute, executeCharsToContentHandler, getAnalysisBits, getContext, getCurrentContextNode, getCurrentNode, getCurrentPos, getDTM, getDTMManager, getExpandEntityReferences, getFilter, getFoundLast, getIsTopLevel, getLastPos, getLength, getPrefixResolver, getRoot, getWhatToShow, getXPathContext, incrementCurrentPos, isDocOrdered, isFresh, isMutable, isNodesetExpr, item, previousNode, reset, returnNextNode, runTo, setCurrentContextNode, setCurrentPos, setEnvironment, setIsTopLevel, setItem, setNextPosition, setShouldCacheNodes, size

Methods inherited from class org.apache.xpath.axes.PredicatedNodeTest

acceptNode, callPredicateVisitors, canTraverseOutsideSubtree, clone, countProximityPosition, fixupVariables, getLocPathIterator, getPredicate, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, getProximityPosition, initPredicateInfo, initProximityPosition, isReverseAxes, nodeToString, resetProximityPositions, setLocPathIterator, setPredicateCount

Methods inherited from class org.apache.xpath.patterns.NodeTest

calcScore, debugWhatToShow, execute, execute, getDefaultScore, getLocalName, getNamespace, getNodeTypeTest, getStaticScore, initNodeTest, initNodeTest, setLocalName, setNamespace, setStaticScore, setWhatToShow

Methods inherited from class org.apache.xpath.Expression

asIteratorRaw, assertion, error, execute, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isSameClass, isStableNumber, num, warn, xstr

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.xml.dtm.DTMIterator

clone

Field Detail

m_axis

protected int m_axis

The traversal axis from where the nodes will be filtered.

Constructor Detail

OneStepIteratorForward

public OneStepIteratorForward(int axis)

Create a OneStepIterator object that will just traverse the self axes.

Parameters:

axis - One of the org.apache.xml.dtm.Axis integers.

Throws:

TransformerException

Method Detail

setRoot

public void setRoot(int context,
                    Object environment)

Initialize the context values for this expression after it is cloned.

Specified by:

setRoot in interface DTMIterator

Overrides:

setRoot in class ChildTestIterator

Parameters:

context - The XPath runtime context for this transformation.

environment - The environment object. The environment in which this iterator operates, which should provide:

• a node (the context node... same value as "root" defined below)
• a pair of non-zero positive integers (the context position and the context size)
• a set of variable bindings
• a function library
• the set of namespace declarations in scope for the expression.

At this time the exact implementation of this environment is application dependent. Probably a proper interface will be created fairly soon.

getNextNode

protected int getNextNode()

Get the next node via getFirstAttribute && getNextAttribute.

Overrides:

getNextNode in class ChildTestIterator

Returns:

The next node on the axis, or DTM.NULL.

getAxis

public int getAxis()

Returns the axis being iterated, if it is known.

Specified by:

getAxis in interface DTMIterator

Overrides:

getAxis in class ChildTestIterator

Returns:

Axis.CHILD, etc., or -1 if the axis is not known or is of multiple types.

deepEquals

public boolean deepEquals(Expression expr)

Description copied from class: Expression

Compare this object with another object and see if they are equal, include the sub heararchy.

Overrides:

deepEquals in class PredicatedNodeTest

Parameters:

expr - Another expression object.

Returns:

true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.

See Also:

Expression.deepEquals(Expression)