Package org.htmlunit.xpath.axes
Class OneStepIterator
- java.lang.Object
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- All Implemented Interfaces:
java.lang.Cloneable,javax.xml.transform.SourceLocator,PathComponent,SubContextList,ExpressionNode,DTMIterator,XPathVisitable
public class OneStepIterator extends ChildTestIterator
This class implements a general iterator for those LocationSteps with only one step, and perhaps a predicate.
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Field Summary
Fields Modifier and Type Field Description protected intm_axisThe traversal axis from where the nodes will be filtered.protected DTMAxisIteratorm_iteratorThe DTM inner traversal class, that corresponds to the super axis.-
Fields inherited from class org.htmlunit.xpath.axes.ChildTestIterator
m_traverser
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Fields inherited from class org.htmlunit.xpath.axes.LocPathIterator
m_cdtm, m_clones, m_context, m_currentContextNode, m_execContext, m_lastFetched, m_length, m_pos, m_stackFrame
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Fields inherited from class org.htmlunit.xpath.axes.PredicatedNodeTest
DEBUG_PREDICATECOUNTING, m_foundLast, m_lpi, m_predCount, m_predicateIndex, m_proximityPositions
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Fields inherited from class org.htmlunit.xpath.patterns.NodeTest
m_name, m_whatToShow, SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_OTHER, SCORE_QNAME, SHOW_BYFUNCTION, WILD
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Fields inherited from interface org.htmlunit.xpath.xml.dtm.DTMIterator
FILTER_ACCEPT, FILTER_SKIP
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Constructor Summary
Constructors Constructor Description OneStepIterator(Compiler compiler, int opPos, int analysis)Create a OneStepIterator object.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Objectclone()DTMIteratorcloneWithReset()Get a cloned Iterator that is reset to the start of the iteration.protected voidcountProximityPosition(int i)Count forward one proximity position.booleandeepEquals(Expression expr)Compare this object with another object and see if they are equal, include the sub heararchy.voiddetach()Detaches theDTMIteratorfrom the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.intgetAxis()Returns the axis being iterated, if it is known.intgetLength()The number of nodes in the list.protected intgetNextNode()Get the next node via getNextXXX.protected intgetProximityPosition(int predicateIndex)Get the current sub-context position.booleanisReverseAxes()Tells if this is a reverse axes.voidreset()Reset the iterator to the start.voidsetRoot(int context, java.lang.Object environment)Reset the root node of theDTMIterator, overriding the value specified when it was created.-
Methods inherited from class org.htmlunit.xpath.axes.BasicTestIterator
nextNode
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Methods inherited from class org.htmlunit.xpath.axes.LocPathIterator
asIterator, asNode, bool, callVisitors, execute, getAnalysisBits, getCurrentNode, getCurrentPos, getDTM, getDTMManager, getExpandEntityReferences, getIsTopLevel, getLastPos, getPrefixResolver, getRoot, getWhatToShow, getXPathContext, incrementCurrentPos, isDocOrdered, isFresh, item, previousNode, returnNextNode, runTo, setCurrentPos, setIsTopLevel, setShouldCacheNodes
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Methods inherited from class org.htmlunit.xpath.axes.PredicatedNodeTest
acceptNode, callPredicateVisitors, canTraverseOutsideSubtree, executePredicates, getPredicate, getPredicateCount, getProximityPosition, getProximityPosition, initPredicateInfo, initProximityPosition, nodeToString, resetProximityPositions, setLocPathIterator, setPredicateCount
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Methods inherited from class org.htmlunit.xpath.patterns.NodeTest
calcScore, execute, execute, getLocalName, getNamespace, getNodeTypeTest, getStaticScore, initNodeTest, initNodeTest, setLocalName, setNamespace, setStaticScore, setWhatToShow
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Methods inherited from class org.htmlunit.xpath.Expression
assertion, error, execute, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isSameClass, isStableNumber, num
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Field Detail
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m_axis
protected int m_axis
The traversal axis from where the nodes will be filtered.
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m_iterator
protected DTMAxisIterator m_iterator
The DTM inner traversal class, that corresponds to the super axis.
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Constructor Detail
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OneStepIterator
OneStepIterator(Compiler compiler, int opPos, int analysis) throws javax.xml.transform.TransformerException
Create a OneStepIterator object.- Parameters:
compiler- A reference to the Compiler that contains the op map.opPos- The position within the op map, which contains the location path expression for this itterator.- Throws:
javax.xml.transform.TransformerException- if any
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Method Detail
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setRoot
public void setRoot(int context, java.lang.Object environment)Reset the root node of theDTMIterator, overriding the value specified when it was created. Note the root node is not the root node of the document tree, but the context node from where the iteration begins.- Specified by:
setRootin interfaceDTMIterator- Overrides:
setRootin classChildTestIterator- Parameters:
context- int Handle of the context node.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.
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detach
public void detach()
Detaches theDTMIteratorfrom the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state. Afterdetachhas been invoked, calls tonextNodeorpreviousNodewill raise a runtime exception.- Specified by:
detachin interfaceDTMIterator- Overrides:
detachin classChildTestIterator
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getNextNode
protected int getNextNode()
Get the next node via getNextXXX. Bottlenecked for derived class override.- Overrides:
getNextNodein classChildTestIterator- Returns:
- The next node on the axis, or DTM.NULL.
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clone
public java.lang.Object clone() throws java.lang.CloneNotSupportedException- Specified by:
clonein interfaceDTMIterator- Overrides:
clonein classPredicatedNodeTest- Returns:
- A clone of this object.
- Throws:
java.lang.CloneNotSupportedException- if any
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cloneWithReset
public DTMIterator cloneWithReset() throws java.lang.CloneNotSupportedException
Get a cloned Iterator that is reset to the start of the iteration.- Specified by:
cloneWithResetin interfaceDTMIterator- Overrides:
cloneWithResetin classChildTestIterator- Returns:
- A clone of this iteration that has been reset.
- Throws:
java.lang.CloneNotSupportedException- if any
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isReverseAxes
public boolean isReverseAxes()
Tells if this is a reverse axes.- Overrides:
isReverseAxesin classPredicatedNodeTest- Returns:
- false, unless a derived class overrides.
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getProximityPosition
protected int getProximityPosition(int predicateIndex)
Get the current sub-context position.- Overrides:
getProximityPositionin classPredicatedNodeTest- Parameters:
predicateIndex- The index of the predicate where the proximity should be taken from.- Returns:
- The node position of this walker in the sub-context node list.
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getLength
public int getLength()
The number of nodes in the list. The range of valid child node indices is 0 tolength-1inclusive. Note that this requires running the iterator to completion, and presumably filling the cache.- Specified by:
getLengthin interfaceDTMIterator- Overrides:
getLengthin classLocPathIterator- Returns:
- The number of nodes in the list.
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countProximityPosition
protected void countProximityPosition(int i)
Count forward one proximity position.- Overrides:
countProximityPositionin classPredicatedNodeTest- Parameters:
i- The index into the m_proximityPositions array, where the increment will occur.
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reset
public void reset()
Reset the iterator to the start. After resetting, the next node returned will be the root node -- or, if that's filtered out, the first node within the root's subtree which is _not_ skipped by the filters.- Specified by:
resetin interfaceDTMIterator- Overrides:
resetin classLocPathIterator
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getAxis
public int getAxis()
Returns the axis being iterated, if it is known.- Specified by:
getAxisin interfaceDTMIterator- Overrides:
getAxisin classChildTestIterator- Returns:
- Axis.CHILD, etc., or -1 if the axis is not known or is of multiple types.
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deepEquals
public boolean deepEquals(Expression expr)
Compare this object with another object and see if they are equal, include the sub heararchy.- Overrides:
deepEqualsin classPredicatedNodeTest- 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.
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