ch.ethz.mxquery.iterators
Class IfThenElseIterator

java.lang.Object
  ch.ethz.mxquery.model.Iterator
      ch.ethz.mxquery.model.CurrentBasedIterator
          ch.ethz.mxquery.iterators.IfThenElseIterator

All Implemented Interfaces:

XDMIterator, Traversable

public class IfThenElseIterator
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

IfThenElseIterator(Context ctx, XDMIterator[] subIters, QueryLocation location)
Constructor for the IfThenElseIterator

Method Summary

PendingUpdateList	getPendingUpdateList() Returns the complete Pending Update List (PUL) of this iterator.
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.
KXmlSerializer	traverseIteratorTree(KXmlSerializer serializer)

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

IfThenElseIterator

public IfThenElseIterator(Context ctx,
                          XDMIterator[] subIters,
                          QueryLocation location)
                   throws MXQueryException

Constructor for the IfThenElseIterator

Parameters:

subIters - Array of Expressions: first Expression is the IF condition; second Expression is the THEN expression; third Expression is the ELSE expression.

Throws:

MXQueryException

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

getPendingUpdateList

public PendingUpdateList getPendingUpdateList()
                                       throws MXQueryException

Description copied from interface: XDMIterator

Returns the complete Pending Update List (PUL) of this iterator. Is null for non-updating expressions. Since the PUL is computed gradually (especially in a scripting environment, this function should only be called when the evaluation is complete. For scripting, this function also merges the PULs of the child iterators, so

Specified by:

getPendingUpdateList in interface XDMIterator

Overrides:

getPendingUpdateList in class Iterator

Returns:

pending update list

Throws:

MXQueryException

traverseIteratorTree

public KXmlSerializer traverseIteratorTree(KXmlSerializer serializer)
                                    throws java.lang.Exception

Specified by:

traverseIteratorTree in interface XDMIterator

Overrides:

traverseIteratorTree in class Iterator

Throws:

java.lang.Exception