ch.ethz.mxquery.bindings
Class WindowTokenIterator

java.lang.Object
  ch.ethz.mxquery.model.Iterator
      ch.ethz.mxquery.model.Window
          ch.ethz.mxquery.bindings.WindowIterator
              ch.ethz.mxquery.bindings.WindowTokenIterator

All Implemented Interfaces:

IndexIterator, XDMIterator, Traversable

Direct Known Subclasses:

WindowEarlyBinding, WindowEarlyBindingParallel, WindowItemIterator

public abstract class WindowTokenIterator
extends WindowIterator

Field Summary

Fields inherited from class ch.ethz.mxquery.model.Window

END_OF_STREAM_NODE, END_OF_STREAM_POSITION

Fields inherited from interface ch.ethz.mxquery.model.XDMIterator

EXPR_CATEGORY_SEQUENTIAL, EXPR_CATEGORY_SIMPLE, EXPR_CATEGORY_UPDATING, EXPR_CATEGORY_VACUOUS, EXPR_PARAM_CHEAPEVAL, EXPR_PARAM_VARIABLE, EXPR_PARAM_WINDOW, EXPR_PARAM_XDMGEN

Constructor Summary

WindowTokenIterator(WindowBuffer mat, int startNodeId, int id)
Creates a new window item iterator.

Method Summary

int	getPosition()
int	getStartNode() Returns the first node id of the window

Methods inherited from class ch.ethz.mxquery.bindings.WindowIterator

destroyWindow, equals, getStore, getWindowId, hashCode, isWindowInUse, setContext, setWindowInUse

Methods inherited from class ch.ethz.mxquery.model.Window

getEndPosition, getNewEarlyParallelWindowInterface, getNewEarlyWindowInterface, getNewItemWindow, getNewWindow, getNextWindowStartPosition, getUnderlyingWindow, increasePosition, isExprParameter, isWindow, jumpToNextAttribute, setPosition

Methods inherited from class ch.ethz.mxquery.model.Iterator

addPredicates, close, copy, copyInts, copyIterators, copyQNames, copyStrings, copyTypeInfos, getAllSubIters, getAllSubItersRecursive, getContext, getExpressionCategoryType, getLoc, getPendingUpdateList, getPredicates, getStaticType, getSubIters, hasPredicates, isConstModePreserve, isOpen, isResettable, removePredicates, reset, setConstModePreserve, setContext, setLoc, setOrderByExpr, setParam, setResettable, setReturnExpr, setSubIters, setSubIters, setSubIters, setWhereExpr, traverse, traverseIteratorTree

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ch.ethz.mxquery.model.IndexIterator

getItem, hasItem, hasNextItem, nextItem

Methods inherited from interface ch.ethz.mxquery.model.XDMIterator

next

Constructor Detail

WindowTokenIterator

public WindowTokenIterator(WindowBuffer mat,
                           int startNodeId,
                           int id)

Creates a new window item iterator. In contrast to a WindowSequenceIterator it allows to define sequences which don't exist only of ongoing numbers. But the positions in nodeIds have to be orders, such that for the position p1, p2, p3 ... pn the following is valic p1 < p2

Parameters:

mat - underlying window buffer

startNodeId - start position

id -

Method Detail

getPosition

public int getPosition()

Specified by:

getPosition in class Window

getStartNode

public int getStartNode()

Description copied from class: Window

Returns the first node id of the window

Specified by:

getStartNode in class WindowIterator

Returns:

returns the first node id of this window