public class FilterExprWalker extends AxesWalker
m_axis, m_nextWalker, m_traverser
m_foundLast, m_lpi, m_predCount, m_proximityPositions
m_name, m_whatToShow, SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_OTHER, SCORE_QNAME, SHOW_BYFUNCTION, SUPPORTS_PRE_STRIPPING, WILD
Constructor and Description |
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FilterExprWalker(WalkingIterator locPathIterator)
Construct a FilterExprWalker using a LocPathIterator.
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Modifier and Type | Method and Description |
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short |
acceptNode(int n)
This method needs to override AxesWalker.acceptNode because FilterExprWalkers
don't need to, and shouldn't, do a node test.
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void |
callPredicateVisitors(XPathVisitor visitor)
This will traverse the heararchy, calling the visitor for
each member.
|
Object |
clone()
Get a cloned FilterExprWalker.
|
boolean |
deepEquals(Expression expr)
Compare this object with another object and see
if they are equal, include the sub heararchy.
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void |
detach()
Detaches the walker from the set which it iterated over, releasing
any computational resources and placing the iterator in the INVALID
state.
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void |
fixupVariables(Vector vars,
int globalsSize)
This function is used to fixup variables from QNames to stack frame
indexes at stylesheet build time.
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int |
getAnalysisBits()
Get the analysis bits for this walker, as defined in the WalkerFactory.
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int |
getAxis()
Returns the axis being iterated, if it is known.
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Expression |
getInnerExpression()
Get the inner contained expression of this filter.
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int |
getLastPos(XPathContext xctxt)
Get the index of the last node that can be itterated to.
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int |
getNextNode()
Moves the
TreeWalker to the next visible node in document
order relative to the current node, and returns the new node. |
void |
init(Compiler compiler,
int opPos,
int stepType)
Init a FilterExprWalker.
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boolean |
isDocOrdered()
Returns true if all the nodes in the iteration well be returned in document
order.
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void |
setInnerExpression(Expression expr)
Set the inner contained expression of this filter.
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void |
setRoot(int root)
Set the root node of the TreeWalker.
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callVisitors, getCurrentNode, getDTM, getExpression, getNextWalker, getPrevWalker, getRoot, nextNode, setDefaultDTM, setExpression, setNextWalker, setPrevWalker, wi
canTraverseOutsideSubtree, countProximityPosition, getLocPathIterator, getPredicate, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, getProximityPosition, initPredicateInfo, initProximityPosition, isReverseAxes, nodeToString, resetProximityPositions, setLocPathIterator, setPredicateCount
calcScore, debugWhatToShow, execute, execute, execute, getDefaultScore, getLocalName, getNamespace, getNodeTypeTest, getStaticScore, getWhatToShow, initNodeTest, initNodeTest, setLocalName, setNamespace, setStaticScore, setWhatToShow
asIterator, asIteratorRaw, asNode, assertion, bool, error, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isSameClass, isStableNumber, num, warn, xstr
public FilterExprWalker(WalkingIterator locPathIterator)
locPathIterator
- non-null reference to the parent iterator.public void init(Compiler compiler, int opPos, int stepType) throws TransformerException
init
in class AxesWalker
compiler
- non-null reference to the Compiler that is constructing.opPos
- positive opcode position for this step.stepType
- The type of step.TransformerException
public void detach()
detach
in class AxesWalker
public void setRoot(int root)
setRoot
in class AxesWalker
root
- non-null reference to the root, or starting point of
the query.public Object clone() throws CloneNotSupportedException
clone
in class AxesWalker
CloneNotSupportedException
public short acceptNode(int n)
acceptNode
in class PredicatedNodeTest
n
- The node to check to see if it passes the filter or not.public int getNextNode()
TreeWalker
to the next visible node in document
order relative to the current node, and returns the new node. If the
current node has no next node, or if the search for nextNode attempts
to step upward from the TreeWalker's root node, returns
null
, and retains the current node.getNextNode
in class AxesWalker
null
if the current node has no
next node in the TreeWalker's logical view.public int getLastPos(XPathContext xctxt)
getLastPos
in interface SubContextList
getLastPos
in class AxesWalker
xctxt
- XPath runtime context.public void fixupVariables(Vector vars, int globalsSize)
fixupVariables
in class PredicatedNodeTest
vars
- List of QNames that correspond to variables. This list
should be searched backwards for the first qualified name that
corresponds to the variable reference qname. The position of the
QName in the vector from the start of the vector will be its position
in the stack frame (but variables above the globalsTop value will need
to be offset to the current stack frame).public Expression getInnerExpression()
public void setInnerExpression(Expression expr)
public int getAnalysisBits()
getAnalysisBits
in interface PathComponent
getAnalysisBits
in class AxesWalker
public boolean isDocOrdered()
isDocOrdered
in class AxesWalker
public int getAxis()
getAxis
in class AxesWalker
public void callPredicateVisitors(XPathVisitor visitor)
callPredicateVisitors
in class PredicatedNodeTest
visitor
- The visitor whose appropriate method will be called.public boolean deepEquals(Expression expr)
Expression
deepEquals
in class AxesWalker
expr
- Another expression object.Expression.deepEquals(Expression)
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