ch.ethz.mxquery.model
Interface IndexIterator

All Known Implementing Classes:

LLStoreIterator, Window, WindowEarlyBinding, WindowEarlyBindingParallel, WindowEmptySequenceIterator, WindowItemIterator, WindowIterator, WindowSequenceIterator, WindowTokenIterator

public interface IndexIterator

If an iterator implements this class, it should have at least an index on items to allow fast access for each item.

Method Summary

XDMIterator	getItem(int position) Returns the item on the given Position.
boolean	hasItem(int position) Checks if the given position is availabe
boolean	hasNextItem() Checks if a nextItem exists
XDMIterator	nextItem() Returns the next item.

Method Detail

hasItem

boolean hasItem(int position)
                throws MXQueryException

Checks if the given position is availabe

Parameters:

position - Position in the sequence (starting with 1)

Returns:

True if the next item is not end_sequence otherwise false

Throws:

MXQueryException

getItem

XDMIterator getItem(int position)
                    throws MXQueryException

Returns the item on the given Position. If the item is not evailabe, an empty sequence item is returned

Parameters:

position - Position in the sequence (starting with 1)

Returns:

Item or empty sequence iterator

Throws:

MXQueryException

hasNextItem

boolean hasNextItem()
                    throws MXQueryException

Checks if a nextItem exists

Returns:

True if the next item is not end_sequence otherwise false

Throws:

MXQueryException

nextItem

XDMIterator nextItem()
                     throws MXQueryException

Returns the next item. If the item is not evailabe, an empty sequence item is returned

Returns:

Item or empty sequence iterator

Throws:

MXQueryException