Package net.sf.saxon.tree.wrapper
Class VirtualCopy.VirtualCopier
- java.lang.Object
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- net.sf.saxon.tree.wrapper.VirtualCopy.VirtualCopier
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- All Implemented Interfaces:
SequenceIterator
,AxisIterator
,UnfailingIterator
- Direct Known Subclasses:
VirtualUntypedCopy.VirtualUntypedCopier
- Enclosing class:
- VirtualCopy
protected class VirtualCopy.VirtualCopier extends java.lang.Object implements AxisIterator
VirtualCopier implements the XPath axes as applied to a VirtualCopy node. It works by applying the requested axis to the node of which this is a copy. There are two complications: firstly, all nodes encountered must themselves be (virtually) copied to give them a new identity. Secondly, axes that stray outside the subtree rooted at the original copied node must be truncated.
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Field Summary
Fields Modifier and Type Field Description protected AxisIterator
base
protected NodeInfo
subtreeRoot
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Fields inherited from interface net.sf.saxon.om.SequenceIterator
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
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Constructor Summary
Constructors Constructor Description VirtualCopier(AxisIterator base, VirtualCopy parent, NodeInfo subtreeRoot)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Value
atomize()
Return the atomized value of the current node.void
close()
Close the iterator.protected VirtualCopy
createCopy(NodeInfo node, NodeInfo root)
Method to create the virtual copy of a node encountered when navigating.NodeInfo
current()
Get the current item in the sequence.AxisIterator
getAnother()
Get another iterator over the same sequence of items, positioned at the start of the sequenceint
getProperties()
Get properties of this iterator, as a bit-significant integer.java.lang.CharSequence
getStringValue()
Return the string value of the current node.AxisIterator
iterateAxis(byte axis, NodeTest test)
Return an iterator over an axis, starting at the current node.boolean
moveNext()
Move to the next node, without returning it.NodeInfo
next()
Get the next item in the sequence.int
position()
Get the current position
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Field Detail
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base
protected AxisIterator base
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subtreeRoot
protected NodeInfo subtreeRoot
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Constructor Detail
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VirtualCopier
public VirtualCopier(AxisIterator base, VirtualCopy parent, NodeInfo subtreeRoot)
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Method Detail
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moveNext
public boolean moveNext()
Move to the next node, without returning it. Returns true if there is a next node, false if the end of the sequence has been reached. After calling this method, the current node may be retrieved using the current() function.- Specified by:
moveNext
in interfaceAxisIterator
- Returns:
- true if there is a next node, false if the end of the sequence has been reached
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next
public NodeInfo next()
Get the next item in the sequence.- Specified by:
next
in interfaceAxisIterator
- Specified by:
next
in interfaceSequenceIterator
- Specified by:
next
in interfaceUnfailingIterator
- Returns:
- the next Item. If there are no more nodes, return null.
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current
public NodeInfo current()
Get the current item in the sequence.- Specified by:
current
in interfaceAxisIterator
- Specified by:
current
in interfaceSequenceIterator
- Specified by:
current
in interfaceUnfailingIterator
- Returns:
- the current item, that is, the item most recently returned by next()
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position
public int position()
Get the current position- Specified by:
position
in interfaceSequenceIterator
- Specified by:
position
in interfaceUnfailingIterator
- Returns:
- the position of the current item (the item most recently returned by next()), starting at 1 for the first node
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close
public void close()
Description copied from interface:SequenceIterator
Close the iterator. This indicates to the supplier of the data that the client does not require any more items to be delivered by the iterator. This may enable the supplier to release resources. After calling close(), no further calls on the iterator should be made; if further calls are made, the effect of such calls is undefined.(Currently, closing an iterator is important only when the data is being "pushed" in another thread. Closing the iterator terminates that thread and means that it needs to do no additional work. Indeed, failing to close the iterator may cause the push thread to hang waiting for the buffer to be emptied.)
- Specified by:
close
in interfaceSequenceIterator
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iterateAxis
public AxisIterator iterateAxis(byte axis, NodeTest test)
Return an iterator over an axis, starting at the current node.- Specified by:
iterateAxis
in interfaceAxisIterator
- Parameters:
axis
- the axis to iterate over, using a constant such asAxis.CHILD
test
- a predicate to apply to the nodes before returning them.- Returns:
- an iterator over an axis, starting at the current node
- Throws:
java.lang.NullPointerException
- if there is no current node
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atomize
public Value atomize() throws XPathException
Return the atomized value of the current node.- Specified by:
atomize
in interfaceAxisIterator
- Returns:
- the atomized value.
- Throws:
java.lang.NullPointerException
- if there is no current nodeXPathException
- if the current node cannot be atomized, for example because it is an element node with element-only content.
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getStringValue
public java.lang.CharSequence getStringValue()
Return the string value of the current node.- Specified by:
getStringValue
in interfaceAxisIterator
- Returns:
- the string value, as an instance of CharSequence.
- Throws:
java.lang.NullPointerException
- if there is no current node
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getAnother
public AxisIterator getAnother()
Get another iterator over the same sequence of items, positioned at the start of the sequence- Specified by:
getAnother
in interfaceAxisIterator
- Specified by:
getAnother
in interfaceSequenceIterator
- Specified by:
getAnother
in interfaceUnfailingIterator
- Returns:
- a new iterator over the same sequence
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getProperties
public int getProperties()
Get properties of this iterator, as a bit-significant integer.- Specified by:
getProperties
in interfaceSequenceIterator
- Returns:
- the properties of this iterator. This will be some combination of
properties such as
SequenceIterator.GROUNDED
,SequenceIterator.LAST_POSITION_FINDER
, andSequenceIterator.LOOKAHEAD
. It is always acceptable to return the value zero, indicating that there are no known special properties. It is acceptable for the properties of the iterator to change depending on its state.
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createCopy
protected VirtualCopy createCopy(NodeInfo node, NodeInfo root)
Method to create the virtual copy of a node encountered when navigating. This method is separated out so that it can be overridden in a subclass.- Parameters:
node
- the node to be copiedroot
- the root of the tree- Returns:
- the virtual copy
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