Package net.sf.saxon.tree.iter
Class ArrayIterator<T extends Item>
- java.lang.Object
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- net.sf.saxon.tree.iter.ArrayIterator<T>
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- All Implemented Interfaces:
LastPositionFinder<T>
,SequenceIterator<T>
,GroundedIterator<T>
,LookaheadIterator<T>
,ReversibleIterator<T>
,UnfailingIterator<T>
public class ArrayIterator<T extends Item> extends java.lang.Object implements UnfailingIterator<T>, ReversibleIterator<T>, LastPositionFinder<T>, LookaheadIterator<T>, GroundedIterator<T>
ArrayIterator is used to enumerate items held in an array. The items are always held in the correct sorted order for the sequence.- Author:
- Michael H. Kay
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Field Summary
Fields Modifier and Type Field Description protected int
end
protected T[]
items
protected int
start
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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 ArrayIterator(T[] nodes)
Create an iterator over all the items in an arrayArrayIterator(T[] items, int start, int end)
Create an iterator over a range of an array.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
close()
Close the iterator.T
current()
Get the current item in the arrayArrayIterator<T>
getAnother()
Get another iterator over the same itemsT[]
getArray()
Get the underlying arrayint
getEndPosition()
Get the end position in the arrayint
getLength()
Get the number of items in the part of the array being processedint
getProperties()
Get properties of this iterator, as a bit-significant integer.SequenceIterator<T>
getReverseIterator()
Get an iterator that processes the same items in reverse orderint
getStartPosition()
Get the initial start positionboolean
hasNext()
Test whether there are any more itemsSequenceIterator<T>
makeSliceIterator(int min, int max)
Create a new ArrayIterator over the same items, with a different start point and end pointGroundedValue
materialize()
Return a SequenceValue containing all the items in the sequence returned by this SequenceIteratorT
next()
Get the next item in the arrayint
position()
Get the position of the current item in the array
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Constructor Detail
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ArrayIterator
public ArrayIterator(T[] nodes)
Create an iterator over all the items in an array- Parameters:
nodes
- the array (of any items, not necessarily nodes) to be processed by the iterator
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ArrayIterator
public ArrayIterator(T[] items, int start, int end)
Create an iterator over a range of an array. Note that the start position is zero-based- Parameters:
items
- the array (of nodes or simple values) to be processed by the iteratorstart
- the position of the first item to be processed (numbering from zero). Must be between zero and nodes.length-1; if not, undefined exceptions are likely to occur.end
- position of first item that is NOT returned, zero-based. Must be beween 1 and nodes.length; if not, undefined exceptions are likely to occur.
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Method Detail
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makeSliceIterator
public SequenceIterator<T> makeSliceIterator(int min, int max)
Create a new ArrayIterator over the same items, with a different start point and end point- Parameters:
min
- the start position (1-based) of the new ArrayIterator relative to the originalmax
- the end position (1-based) of the last item to be delivered by the new ArrayIterator, relative to the original. For example, min=2, max=3 delivers the two items ($base[2], $base[3]). Set this to Integer.MAX_VALUE if there is no end limit.- Returns:
- an iterator over the items between the min and max positions
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hasNext
public boolean hasNext()
Test whether there are any more items- Specified by:
hasNext
in interfaceLookaheadIterator<T extends Item>
- Returns:
- true if there are more items
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next
public T next()
Get the next item in the array- Specified by:
next
in interfaceSequenceIterator<T extends Item>
- Specified by:
next
in interfaceUnfailingIterator<T extends Item>
- Returns:
- the next item in the array
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current
public T current()
Get the current item in the array- Specified by:
current
in interfaceSequenceIterator<T extends Item>
- Specified by:
current
in interfaceUnfailingIterator<T extends Item>
- Returns:
- the item returned by the most recent call of next()
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position
public int position()
Get the position of the current item in the array- Specified by:
position
in interfaceSequenceIterator<T extends Item>
- Specified by:
position
in interfaceUnfailingIterator<T extends Item>
- Returns:
- the current position (starting at 1 for the first item)
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getLength
public int getLength()
Get the number of items in the part of the array being processed- Specified by:
getLength
in interfaceLastPositionFinder<T extends Item>
- Returns:
- the number of items; equivalently, the position of the last item
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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<T extends Item>
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getAnother
public ArrayIterator<T> getAnother()
Get another iterator over the same items- Specified by:
getAnother
in interfaceSequenceIterator<T extends Item>
- Specified by:
getAnother
in interfaceUnfailingIterator<T extends Item>
- Returns:
- a new ArrayIterator
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getReverseIterator
public SequenceIterator<T> getReverseIterator()
Get an iterator that processes the same items in reverse order- Specified by:
getReverseIterator
in interfaceReversibleIterator<T extends Item>
- Returns:
- a new ArrayIterator
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getArray
public T[] getArray()
Get the underlying array- Returns:
- the underlying array being processed by the iterator
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getStartPosition
public int getStartPosition()
Get the initial start position- Returns:
- the start position of the iterator in the array (zero-based)
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getEndPosition
public int getEndPosition()
Get the end position in the array- Returns:
- the position in the array (zero-based) of the first item not included in the iteration
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materialize
public GroundedValue materialize()
Return a SequenceValue containing all the items in the sequence returned by this SequenceIterator- Specified by:
materialize
in interfaceGroundedIterator<T extends Item>
- Returns:
- the corresponding SequenceValue
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getProperties
public int getProperties()
Get properties of this iterator, as a bit-significant integer.- Specified by:
getProperties
in interfaceSequenceIterator<T extends Item>
- 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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