Class UnionChildIterator


public class UnionChildIterator
extends ChildTestIterator

This class defines a simplified type of union iterator that only tests along the child axes. If the conditions are right, it is much faster than using a UnionPathIterator.

See Also:
Serialized Form

Fields inherited from class org.apache.xpath.axes.LocPathIterator
Fields inherited from class org.apache.xpath.patterns.NodeTest
Constructor Summary
          Constructor for UnionChildIterator
Method Summary
 short acceptNode(int n)
          Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator.
 void addNodeTest(PredicatedNodeTest test)
          Add a node test to the union list.
 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.
Methods inherited from class org.apache.xpath.axes.ChildTestIterator
cloneWithReset, detach, getAxis, setRoot
Methods inherited from class org.apache.xpath.axes.BasicTestIterator
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, runTo, setCurrentContextNode, setCurrentPos, setEnvironment, setIsTopLevel, setItem, setShouldCacheNodes, size
Methods inherited from class org.apache.xpath.axes.PredicatedNodeTest
callPredicateVisitors, canTraverseOutsideSubtree, clone, deepEquals, 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


public UnionChildIterator()
Constructor for UnionChildIterator
Method Detail


public void addNodeTest(PredicatedNodeTest test)
Add a node test to the union list.
test - reference to a NodeTest, which will be added directly to the list of node tests (in other words, it will not be cloned). The parent of this test will be set to this object.


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.
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).
fixupVariables in class PredicatedNodeTest


public short acceptNode(int n)
Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator. This function will be called by the implementation of TreeWalker and NodeIterator; it is not intended to be called directly from user code.
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 .
acceptNode in class PredicatedNodeTest

Copyright 2006 Apache XML Project. All Rights Reserved.