ch.ethz.mxquery.functions.fn
Class BooleanIterator

java.lang.Object
  ch.ethz.mxquery.model.Iterator
      ch.ethz.mxquery.model.TokenBasedIterator
          ch.ethz.mxquery.functions.fn.BooleanIterator

All Implemented Interfaces:

XDMIterator, Traversable

public class BooleanIterator
extends TokenBasedIterator

Field Summary

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

BooleanIterator()

BooleanIterator(Context ctx, XDMIterator[] subIters, QueryLocation location)

Method Summary

static XDMIterator	createEBVIterator(XDMIterator iter, Context ctx) Creates a EffectiveBooleanIterator that can never return an empty sequence
TypeInfo	getStaticType() Return the return type if it can be statically determined

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

next

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

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

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BooleanIterator

public BooleanIterator(Context ctx,
                       XDMIterator[] subIters,
                       QueryLocation location)

BooleanIterator

public BooleanIterator()

Method Detail

createEBVIterator

public static XDMIterator createEBVIterator(XDMIterator iter,
                                            Context ctx)

Creates a EffectiveBooleanIterator that can never return an empty sequence

Parameters:

iter -

Returns:

a boolean iterator, unless iter already produces either true or false

getStaticType

public TypeInfo getStaticType()

Description copied from interface: XDMIterator

Return the return type if it can be statically determined

Specified by:

getStaticType in interface XDMIterator

Overrides:

getStaticType in class Iterator

Returns:

a Type info carrying the most precise static type that could be determined. If no specific type could be determined, the type is ITEM*