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java.lang.Objectorg.apache.xpath.Expression
org.apache.xpath.patterns.NodeTest
org.apache.xpath.axes.PredicatedNodeTest
org.apache.xpath.axes.LocPathIterator
org.apache.xpath.axes.UnionPathIterator
public class UnionPathIterator
This class extends NodeSetDTM, which implements DTMIterator, and fetches nodes one at a time in document order based on a XPath UnionExpr. As each node is iterated via nextNode(), the node is also stored in the NodeVector, so that previousNode() can easily be done.
Field Summary |
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Fields inherited from class org.apache.xpath.axes.LocPathIterator |
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m_lastFetched |
Fields inherited from class org.apache.xpath.patterns.NodeTest |
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SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_OTHER, SCORE_QNAME, SHOW_BYFUNCTION, SUPPORTS_PRE_STRIPPING, WILD |
Fields inherited from interface org.apache.xml.dtm.DTMIterator |
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FILTER_ACCEPT, FILTER_REJECT, FILTER_SKIP |
Constructor Summary | |
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UnionPathIterator()
Constructor to create an instance which you can add location paths to. |
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UnionPathIterator(Compiler compiler,
int opPos)
Create a UnionPathIterator object, including creation of location path iterators from the opcode list, and call back into the Compiler to create predicate expressions. |
Method Summary | |
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void |
addIterator(DTMIterator expr)
Add an iterator to the union list. |
void |
callVisitors(ExpressionOwner owner,
XPathVisitor visitor)
This will traverse the heararchy, calling the visitor for each member. |
java.lang.Object |
clone()
Get a cloned LocPathIterator that holds the same position as this iterator. |
static LocPathIterator |
createUnionIterator(Compiler compiler,
int opPos)
This will return an iterator capable of handling the union of paths given. |
boolean |
deepEquals(Expression expr)
Compare this object with another object and see if they are equal, include the sub heararchy. |
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. |
int |
getAxis()
Returns the axis being iterated, if it is known. |
int |
nextNode()
Returns the next node in the set and advances the position of the iterator in the set. |
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 |
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allowDetachToRelease, asIterator, asNode, bool, cloneWithReset, execute, executeCharsToContentHandler, 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 |
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acceptNode, callPredicateVisitors, canTraverseOutsideSubtree, getLocPathIterator, getPredicate, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, initProximityPosition, isReverseAxes, resetProximityPositions, setLocPathIterator, setPredicateCount |
Methods inherited from class org.apache.xpath.patterns.NodeTest |
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debugWhatToShow, execute, execute, getDefaultScore, getLocalName, getNamespace, getNodeTypeTest, getStaticScore, initNodeTest, initNodeTest, setLocalName, setNamespace, setStaticScore, setWhatToShow |
Methods inherited from class org.apache.xpath.Expression |
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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 |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.apache.xml.dtm.DTMIterator |
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allowDetachToRelease, cloneWithReset, getCurrentNode, getCurrentPos, getDTM, getDTMManager, getExpandEntityReferences, getLength, getRoot, getWhatToShow, isDocOrdered, isFresh, isMutable, item, previousNode, reset, runTo, setCurrentPos, setItem, setShouldCacheNodes |
Constructor Detail |
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public UnionPathIterator()
public UnionPathIterator(Compiler compiler, int opPos) throws javax.xml.transform.TransformerException
compiler
- The Compiler which is creating
this expression.opPos
- The position of this iterator in the
opcode list from the compiler.
javax.xml.transform.TransformerException
Method Detail |
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public void setRoot(int context, java.lang.Object environment)
setRoot
in interface DTMIterator
setRoot
in class LocPathIterator
context
- The XPath runtime context for this
transformation.environment
- The environment object.
The environment in which this iterator operates, which should provide:
At this time the exact implementation of this environment is application dependent. Probably a proper interface will be created fairly soon.
public void addIterator(DTMIterator expr)
expr
- non-null reference to a location path iterator.public void detach()
detach
has been invoked, calls to
nextNode
orpreviousNode
will raise the
exception INVALID_STATE_ERR.
detach
in interface DTMIterator
detach
in class LocPathIterator
public static LocPathIterator createUnionIterator(Compiler compiler, int opPos) throws javax.xml.transform.TransformerException
compiler
- The Compiler which is creating
this expression.opPos
- The position of this iterator in the
opcode list from the compiler.
javax.xml.transform.TransformerException
public int getAnalysisBits()
getAnalysisBits
in interface PathComponent
getAnalysisBits
in class LocPathIterator
public java.lang.Object clone() throws java.lang.CloneNotSupportedException
clone
in interface DTMIterator
clone
in class PredicatedNodeTest
java.lang.CloneNotSupportedException
public int nextNode()
nextNode
in interface DTMIterator
nextNode
in class LocPathIterator
Node
in the set being iterated over, or
null
if there are no more members in that set.public void fixupVariables(java.util.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 int getAxis()
getAxis
in interface DTMIterator
getAxis
in class LocPathIterator
public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
XPathVisitable
callVisitors
in interface XPathVisitable
callVisitors
in class LocPathIterator
owner
- The owner of the visitor, where that path may be
rewritten if needed.visitor
- The visitor whose appropriate method will be called.XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)
public boolean deepEquals(Expression expr)
Expression
deepEquals
in class PredicatedNodeTest
expr
- Another expression object.
Expression.deepEquals(Expression)
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