ch.ethz.mxquery.functions.fn
Class DataValuesIterator

java.lang.Object
  ch.ethz.mxquery.model.Iterator
      ch.ethz.mxquery.model.CurrentBasedIterator
          ch.ethz.mxquery.functions.fn.DataValuesIterator

All Implemented Interfaces:

XDMIterator, Traversable

public class DataValuesIterator
extends CurrentBasedIterator

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

DataValuesIterator()

Method Summary

static XDMIterator	getDataIterator(XDMIterator iter, Context ctx) This method returns a dataValuesIterator if the underlying iterator doesn't promise to give back a typed value! Otherwise the underlying iterator is given back
TypeInfo	getStaticType() Return the return type if it can be statically determined
Token	next() Produces the next XDM token This method typically implements the base functionality of an Iterator and computes the value of the next token.
void	setFnData(boolean fnData)

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

DataValuesIterator

public DataValuesIterator()

Method Detail

next

public Token next()
           throws MXQueryException

Description copied from interface: XDMIterator

Produces the next XDM token This method typically implements the base functionality of an Iterator and computes the value of the next token.

Returns:

The XDM token representing the next fragment of the XDM instance

Throws:

MXQueryException

getDataIterator

public static XDMIterator getDataIterator(XDMIterator iter,
                                          Context ctx)

This method returns a dataValuesIterator if the underlying iterator doesn't promise to give back a typed value! Otherwise the underlying iterator is given back

Parameters:

iter - underlying iterator

ctx - TODO

Returns:

An iterator which returns a sequence of atomic values

Throws:

MXQueryException

setFnData

public void setFnData(boolean fnData)

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*