Package org.apache.xpath.axes
Class FilterExprIteratorSimple
- java.lang.Object
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- org.apache.xpath.Expression
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- org.apache.xpath.patterns.NodeTest
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- org.apache.xpath.axes.PredicatedNodeTest
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- org.apache.xpath.axes.LocPathIterator
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- org.apache.xpath.axes.FilterExprIteratorSimple
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,javax.xml.transform.SourceLocator
,DTMIterator
,PathComponent
,SubContextList
,ExpressionNode
,XPathVisitable
public class FilterExprIteratorSimple extends LocPathIterator
Class to use for one-step iteration that doesn't have a predicate, and doesn't need to set the context.- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.apache.xpath.axes.LocPathIterator
m_lastFetched
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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
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Fields inherited from interface org.apache.xml.dtm.DTMIterator
FILTER_ACCEPT, FILTER_REJECT, FILTER_SKIP
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Constructor Summary
Constructors Constructor Description FilterExprIteratorSimple()
Create a FilterExprIteratorSimple object.FilterExprIteratorSimple(Expression expr)
Create a FilterExprIteratorSimple object.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
callPredicateVisitors(XPathVisitor visitor)
This will traverse the heararchy, calling the visitor for each member.boolean
deepEquals(Expression expr)
Compare this object with another object and see if they are equal, include the sub heararchy.void
detach()
Detaches the walker from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.static XNodeSet
executeFilterExpr(int context, XPathContext xctxt, PrefixResolver prefixResolver, boolean isTopLevel, int stackFrame, Expression expr)
Execute the expression.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.Expression
getInnerExpression()
Get the inner contained expression of this filter.boolean
isDocOrdered()
Returns true if all the nodes in the iteration well be returned in document order.int
nextNode()
Returns the next node in the set and advances the position of the iterator in the set.void
setInnerExpression(Expression expr)
Set the inner contained expression of this filter.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, callVisitors, cloneWithReset, execute, executeCharsToContentHandler, getContext, getCurrentContextNode, getCurrentNode, getCurrentPos, getDTM, getDTMManager, getExpandEntityReferences, getFilter, getFoundLast, getIsTopLevel, getLastPos, getLength, getPrefixResolver, getRoot, getWhatToShow, getXPathContext, incrementCurrentPos, isFresh, isMutable, isNodesetExpr, item, previousNode, reset, runTo, setCurrentContextNode, setCurrentPos, setEnvironment, setIsTopLevel, setItem, setShouldCacheNodes, size
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Methods inherited from class org.apache.xpath.axes.PredicatedNodeTest
acceptNode, canTraverseOutsideSubtree, clone, getLocPathIterator, getPredicate, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, initProximityPosition, isReverseAxes, resetProximityPositions, setLocPathIterator, setPredicateCount
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Methods inherited from class org.apache.xpath.patterns.NodeTest
debugWhatToShow, execute, execute, getDefaultScore, getLocalName, getNamespace, getNodeTypeTest, getStaticScore, initNodeTest, initNodeTest, setLocalName, setNamespace, setStaticScore, setWhatToShow
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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
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Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.xml.dtm.DTMIterator
clone
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Constructor Detail
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FilterExprIteratorSimple
public FilterExprIteratorSimple()
Create a FilterExprIteratorSimple object.
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FilterExprIteratorSimple
public FilterExprIteratorSimple(Expression expr)
Create a FilterExprIteratorSimple object.
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Method Detail
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setRoot
public void setRoot(int context, java.lang.Object environment)
Initialize the context values for this expression after it is cloned.- Specified by:
setRoot
in interfaceDTMIterator
- Overrides:
setRoot
in classLocPathIterator
- Parameters:
context
- The XPath runtime context for this transformation.environment
- The environment object. The environment in which this iterator operates, which should provide:- a node (the context node... same value as "root" defined below)
- a pair of non-zero positive integers (the context position and the context size)
- a set of variable bindings
- a function library
- the set of namespace declarations in scope for the expression.
At this time the exact implementation of this environment is application dependent. Probably a proper interface will be created fairly soon.
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executeFilterExpr
public static XNodeSet executeFilterExpr(int context, XPathContext xctxt, PrefixResolver prefixResolver, boolean isTopLevel, int stackFrame, Expression expr) throws WrappedRuntimeException
Execute the expression. Meant for reuse by other FilterExpr iterators that are not derived from this object.- Throws:
WrappedRuntimeException
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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.- Specified by:
nextNode
in interfaceDTMIterator
- Specified by:
nextNode
in classLocPathIterator
- Returns:
- The next
Node
in the set being iterated over, ornull
if there are no more members in that set.
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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.- Specified by:
detach
in interfaceDTMIterator
- Overrides:
detach
in classLocPathIterator
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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.- Overrides:
fixupVariables
in classPredicatedNodeTest
- 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).
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getInnerExpression
public Expression getInnerExpression()
Get the inner contained expression of this filter.
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setInnerExpression
public void setInnerExpression(Expression expr)
Set the inner contained expression of this filter.
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getAnalysisBits
public int getAnalysisBits()
Get the analysis bits for this walker, as defined in the WalkerFactory.- Specified by:
getAnalysisBits
in interfacePathComponent
- Overrides:
getAnalysisBits
in classLocPathIterator
- Returns:
- One of WalkerFactory#BIT_DESCENDANT, etc.
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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!- Specified by:
isDocOrdered
in interfaceDTMIterator
- Overrides:
isDocOrdered
in classLocPathIterator
- Returns:
- true as a default.
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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.- Overrides:
callPredicateVisitors
in classPredicatedNodeTest
- Parameters:
visitor
- The visitor whose appropriate method will be called.
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deepEquals
public boolean deepEquals(Expression expr)
Description copied from class:Expression
Compare this object with another object and see if they are equal, include the sub heararchy.- Overrides:
deepEquals
in classPredicatedNodeTest
- Parameters:
expr
- Another expression object.- Returns:
- true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.
- See Also:
Expression.deepEquals(Expression)
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getAxis
public int getAxis()
Returns the axis being iterated, if it is known.- Specified by:
getAxis
in interfaceDTMIterator
- Overrides:
getAxis
in classLocPathIterator
- Returns:
- Axis.CHILD, etc., or -1 if the axis is not known or is of multiple types.
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