org.apache.xpath.axes
Class FilterExprWalker
- Cloneable, ExpressionNode, ExpressionOwner, PathComponent, java.io.Serializable, SourceLocator, SubContextList, XPathVisitable
public class FilterExprWalker
Walker for the OP_VARIABLE, or OP_EXTFUNCTION, or OP_FUNCTION, or OP_GROUP,
op codes.
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.
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Object | clone() - Get a cloned FilterExprWalker.
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boolean | deepEquals(Expression expr)
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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(java.util.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.
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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 , clone , deepEquals , detach , getAnalysisBits , getAxis , getCurrentNode , getDTM , getExpression , getLastPos , getNextWalker , getPrevWalker , getRoot , init , isDocOrdered , nextNode , setDefaultDTM , setExpression , setNextWalker , setPrevWalker , setRoot , wi |
acceptNode , callPredicateVisitors , canTraverseOutsideSubtree , clone , deepEquals , fixupVariables , getLastPos , getLocPathIterator , getPredicate , getPredicateCount , getPredicateIndex , getProximityPosition , getProximityPosition , initProximityPosition , isReverseAxes , resetProximityPositions , setLocPathIterator , setPredicateCount |
callVisitors , debugWhatToShow , deepEquals , execute , execute , execute , fixupVariables , getDefaultScore , getLocalName , getNamespace , getNodeTypeTest , getStaticScore , getWhatToShow , initNodeTest , initNodeTest , setLocalName , setNamespace , setStaticScore , setWhatToShow |
asIterator , asIteratorRaw , asNode , assertion , bool , canTraverseOutsideSubtree , deepEquals , error , execute , execute , execute , execute , executeCharsToContentHandler , exprAddChild , exprGetChild , exprGetNumChildren , exprGetParent , exprSetParent , fixupVariables , getColumnNumber , getExpressionOwner , getLineNumber , getPublicId , getSystemId , isNodesetExpr , isStableNumber , num , warn , xstr |
FilterExprWalker
public FilterExprWalker(WalkingIterator locPathIterator)
Construct a FilterExprWalker using a LocPathIterator.
locPathIterator
- non-null reference to the parent iterator.
acceptNode
public short acceptNode(int n)
This method needs to override AxesWalker.acceptNode because FilterExprWalkers
don't need to, and shouldn't, do a node test.
- acceptNode in interface PredicatedNodeTest
n
- The node to check to see if it passes the filter or not.
- a constant to determine whether the node is accepted,
rejected, or skipped, as defined above .
callPredicateVisitors
public void callPredicateVisitors(XPathVisitor visitor)
This will traverse the heararchy, calling the visitor for
each member. If the called visitor method returns
false, the subtree should not be called.
- callPredicateVisitors in interface PredicatedNodeTest
visitor
- The visitor whose appropriate method will be called.
clone
public Object clone()
throws CloneNotSupportedException
Get a cloned FilterExprWalker.
- clone in interface AxesWalker
- A new FilterExprWalker that can be used without mutating this one.
detach
public void detach()
Detaches the walker from the set which it iterated over, releasing
any computational resources and placing the iterator in the INVALID
state.
- detach in interface AxesWalker
fixupVariables
public void fixupVariables(java.util.Vector vars,
int globalsSize)
This function is used to fixup variables from QNames to stack frame
indexes at stylesheet build time.
- fixupVariables in interface 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).
getAxis
public int getAxis()
Returns the axis being iterated, if it is known.
- getAxis in interface AxesWalker
- Axis.CHILD, etc., or -1 if the axis is not known or is of multiple
types.
getInnerExpression
public Expression getInnerExpression()
Get the inner contained expression of this filter.
getNextNode
public int getNextNode()
Moves the 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.
- The new node, or
null
if the current node has no
next node in the TreeWalker's logical view.
init
public void init(Compiler compiler,
int opPos,
int stepType)
throws javax.xml.transform.TransformerException
Init a FilterExprWalker.
- init in interface AxesWalker
compiler
- non-null reference to the Compiler that is constructing.opPos
- positive opcode position for this step.stepType
- The type of step.
isDocOrdered
public boolean isDocOrdered()
Returns true if all the nodes in the iteration well be returned in document
order.
Warning: This can only be called after setRoot has been called!
- isDocOrdered in interface AxesWalker
setInnerExpression
public void setInnerExpression(Expression expr)
Set the inner contained expression of this filter.
setRoot
public void setRoot(int root)
Set the root node of the TreeWalker.
- setRoot in interface AxesWalker
root
- non-null reference to the root, or starting point of
the query.
Copyright © 2006 Apache XML Project. All Rights Reserved.