## org.apache.xpath.axes
Class WalkingIterator

    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.WalkingIterator

Direct Known Subclasses:
  WalkingIteratorSorted

public class WalkingIterator
extends LocPathIterator
implements ExpressionOwner

Location path iterator that uses Walkers.

See Also:
  Serialized Form

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

Fields inherited from class org.apache.xpath.patterns.NodeTest
`SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_OTHER, SCORE_QNAME, SHOW_BYFUNCTION, SUPPORTS_PRE_STRIPPING, WILD`

Constructor Summary
`WalkingIterator(PrefixResolver nscontext)` Create a WalkingIterator object.

Method Summary
`void` `callVisitors(ExpressionOwner owner, XPathVisitor visitor)`
`java.lang.Object` `clone()` Get a cloned WalkingIterator that holds the same position as this iterator.
`boolean` `deepEquals(Expression expr)`
`void` `detach()` Detaches the iterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.
`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.
`int` `getAnalysisBits()` Get the analysis bits for this walker, as defined in the WalkerFactory.
`Expression` `getExpression()`
`AxesWalker` `getFirstWalker()` Get the head of the walker list.
`AxesWalker` `getLastUsedWalker()` Get the last used walker.
`int` `nextNode()` Returns the next node in the set and advances the position of the iterator in the set.
`void` `reset()` Reset the iterator.
`void` `setExpression(Expression exp)`
`void` `setFirstWalker(AxesWalker walker)` Set the head of the walker list.
`void` `setLastUsedWalker(AxesWalker walker)` Set the last used walker.
`void` `setRoot(int context, java.lang.Object environment)` Initialize the context values for this expression after it is cloned.

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

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

Methods inherited from class org.apache.xpath.axes.PredicatedNodeTest
`acceptNode, callPredicateVisitors, canTraverseOutsideSubtree, getLocPathIterator, getPredicate, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, initProximityPosition, isReverseAxes, resetProximityPositions, setLocPathIterator, setPredicateCount`

Methods inherited from class org.apache.xpath.patterns.NodeTest
`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, isStableNumber, num, warn, xstr`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### WalkingIterator

    public WalkingIterator(PrefixResolver nscontext)

  Create a WalkingIterator object.
  Parameters:
    `nscontext` - The namespace context for this iterator, should be OK if null.

Method Detail

### getAnalysisBits

    public int getAnalysisBits()

  Get the analysis bits for this walker, as defined in the WalkerFactory.
  Returns:
    One of WalkerFactory#BIT_DESCENDANT, etc.
  Overrides:
    getAnalysisBits in class LocPathIterator

### clone

    public java.lang.Object clone()
                           throws java.lang.CloneNotSupportedException

  Get a cloned WalkingIterator that holds the same position as this iterator.
  Returns:
    A clone of this iterator that holds the same node position.
  Throws:
    java.lang.CloneNotSupportedException -
  Overrides:
    clone in class PredicatedNodeTest

### reset

    public void reset()

  Reset the iterator.
  Overrides:
    reset in class LocPathIterator

### setRoot

    public void setRoot(int context,
                        java.lang.Object environment)

  Initialize the context values for this expression after it is cloned.
  Parameters:
    `context` - The XPath runtime context for this transformation.
  Overrides:
    setRoot in class LocPathIterator

### nextNode

    public int nextNode()

  Returns the next node in the set and advances the position of the iterator in the set. After a NodeIterator is created, the first call to nextNode() returns the first node in the set.
  Returns:
    The next `Node` in the set being iterated over, or `null` if there are no more members in that set.
  Overrides:
    nextNode in class LocPathIterator

### getFirstWalker

    public final AxesWalker getFirstWalker()

  Get the head of the walker list.
  Returns:
    The head of the walker list, or null if this iterator does not implement walkers.
  Usage:
    **For advanced use only**

### setFirstWalker

    public final void setFirstWalker(AxesWalker walker)

  Set the head of the walker list.
  Parameters:
    `walker` - Should be a valid AxesWalker.
  Usage:
    **For advanced use only**

### setLastUsedWalker

    public final void setLastUsedWalker(AxesWalker walker)

  Set the last used walker.
  Parameters:
    `walker` - The last used walker, or null.
  Usage:
    **For advanced use only**

### getLastUsedWalker

    public final AxesWalker getLastUsedWalker()

  Get the last used walker.
  Returns:
    The last used walker, or null.
  Usage:
    **For advanced use only**

### detach

    public void detach()

  Detaches the iterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state. After`detach` has been invoked, calls to `nextNode` or`previousNode` will raise the exception INVALID_STATE_ERR.
  Overrides:
    detach in class LocPathIterator

### 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.
  Parameters:
    `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).
  Overrides:
    fixupVariables in class PredicatedNodeTest

### callVisitors

    public void callVisitors(ExpressionOwner owner,
                             XPathVisitor visitor)

  Overrides:
    callVisitors in class LocPathIterator
  See Also:
    `XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)`

### getExpression

    public Expression getExpression()

  Specified by:
    getExpression in interface ExpressionOwner
  See Also:
    `ExpressionOwner.getExpression()`

### setExpression

    public void setExpression(Expression exp)

  Specified by:
    setExpression in interface ExpressionOwner
  See Also:
    `ExpressionOwner.setExpression(Expression)`

### deepEquals

    public boolean deepEquals(Expression expr)

  Overrides:
    deepEquals in class PredicatedNodeTest
  See Also:
    `Expression.deepEquals(Expression)`

Copyright © 2006 Apache XML Project. All Rights Reserved.