Package org.apache.xpath.axes
Class OneStepIterator
- java.lang.Object
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,javax.xml.transform.SourceLocator
,DTMIterator
,PathComponent
,SubContextList
,ExpressionNode
,XPathVisitable
public class OneStepIterator extends ChildTestIterator
This class implements a general iterator for those LocationSteps with only one step, and perhaps a predicate.- See Also:
org.apache.xpath.axes#LocPathIterator
, 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 OneStepIterator(DTMAxisIterator iterator, int axis)
Create a OneStepIterator object.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
clone()
Get a cloned iterator.DTMIterator
cloneWithReset()
Get a cloned Iterator that is reset to the beginning of the query.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.int
getAxis()
Returns the axis being iterated, if it is known.int
getLength()
The number of nodes in the list.boolean
isReverseAxes()
Tells if this is a reverse axes.void
reset()
Reset the iterator.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.BasicTestIterator
nextNode
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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, getPrefixResolver, getRoot, getWhatToShow, getXPathContext, incrementCurrentPos, isDocOrdered, isFresh, isMutable, isNodesetExpr, item, previousNode, runTo, setCurrentContextNode, setCurrentPos, setEnvironment, setIsTopLevel, setItem, setShouldCacheNodes, size
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Methods inherited from class org.apache.xpath.axes.PredicatedNodeTest
acceptNode, callPredicateVisitors, canTraverseOutsideSubtree, fixupVariables, getLocPathIterator, getPredicate, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, initProximityPosition, 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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Constructor Detail
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OneStepIterator
public OneStepIterator(DTMAxisIterator iterator, int axis) throws javax.xml.transform.TransformerException
Create a OneStepIterator object.- Parameters:
iterator
- The DTM iterator which this iterator will use.axis
- One of Axis.Child, etc., or -1 if the axis is unknown.- Throws:
javax.xml.transform.TransformerException
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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 classChildTestIterator
- 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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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. Afterdetach
has been invoked, calls tonextNode
orpreviousNode
will raise the exception INVALID_STATE_ERR.- Specified by:
detach
in interfaceDTMIterator
- Overrides:
detach
in classChildTestIterator
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clone
public java.lang.Object clone() throws java.lang.CloneNotSupportedException
Get a cloned iterator.- Specified by:
clone
in interfaceDTMIterator
- Overrides:
clone
in classPredicatedNodeTest
- Returns:
- A new iterator that can be used without mutating this one.
- Throws:
java.lang.CloneNotSupportedException
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cloneWithReset
public DTMIterator cloneWithReset() throws java.lang.CloneNotSupportedException
Get a cloned Iterator that is reset to the beginning of the query.- Specified by:
cloneWithReset
in interfaceDTMIterator
- Overrides:
cloneWithReset
in classChildTestIterator
- Returns:
- A cloned NodeIterator set of the start of the query.
- Throws:
java.lang.CloneNotSupportedException
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isReverseAxes
public boolean isReverseAxes()
Tells if this is a reverse axes. Overrides AxesWalker#isReverseAxes.- Overrides:
isReverseAxes
in classPredicatedNodeTest
- Returns:
- true for this class.
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getLength
public int getLength()
The number of nodes in the list. The range of valid child node indices is 0 tolength-1
inclusive.- Specified by:
getLength
in interfaceDTMIterator
- Overrides:
getLength
in classLocPathIterator
- Returns:
- The number of nodes in the list, always greater or equal to zero.
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reset
public void reset()
Reset the iterator.- Specified by:
reset
in interfaceDTMIterator
- Overrides:
reset
in classLocPathIterator
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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 classChildTestIterator
- Returns:
- Axis.CHILD, etc., or -1 if the axis is not known or is of multiple types.
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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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