ch.ethz.mxquery.iterators
Class LetIterator

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

All Implemented Interfaces:

XDMIterator, Traversable

public class LetIterator
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

LetIterator(Context ctx, XDMIterator[] subIters, QName var, TypeInfo t, QueryLocation location)

Method Summary

XDMIterator	copy(Context parentIterContext, XQStaticContext newParentIterContext, boolean copyContext, java.util.Vector nestedPredCtxStack) Copies the 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.

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

addPredicates, close, copyInts, copyIterators, copyQNames, copyStrings, copyTypeInfos, getAllSubIters, getAllSubItersRecursive, getContext, getExpressionCategoryType, getLoc, getPendingUpdateList, getPredicates, getStaticType, 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

LetIterator

public LetIterator(Context ctx,
                   XDMIterator[] subIters,
                   QName var,
                   TypeInfo t,
                   QueryLocation location)
            throws MXQueryException

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

copy

public final XDMIterator copy(Context parentIterContext,
                              XQStaticContext newParentIterContext,
                              boolean copyContext,
                              java.util.Vector nestedPredCtxStack)
                       throws MXQueryException

Description copied from interface: XDMIterator

Copies the Iterator. The context is copied (if necessary) here. The subIterators are copied (if existing) here.

Specified by:

copy in interface XDMIterator

Overrides:

copy in class Iterator

Parameters:

parentIterContext - The new parent context

newParentIterContext - The previous context of the parent iterator

copyContext - Copy the context or use the parent context

nestedPredCtxStack - The Stack of nested predicate context, needed for nested rewritten predicates

Returns:

A copy of this Iterator

Throws:

MXQueryException