ch.ethz.mxquery.iterators.update
Class TransformIterator

java.lang.Object
  ch.ethz.mxquery.model.Iterator
      ch.ethz.mxquery.model.CurrentBasedIterator
          ch.ethz.mxquery.iterators.update.TransformIterator

All Implemented Interfaces:

XDMIterator, Traversable

public class TransformIterator
extends CurrentBasedIterator

Represents the expression TRANSFORM.

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

TransformIterator(Context ctx, XDMIterator[] copyExprs, QName[] copyVars, XDMIterator modifyExpr, XDMIterator returnExpr, QueryLocation location)
Constructor

Method Summary

XDMIterator	copy(Context parentIterContext, XQStaticContext prevParentIterContext, boolean copyContext, java.util.Vector nestedPredCtxStack) Copies the Iterator.
XDMIterator[]	getAllSubIters()
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	setResettable(boolean r) Checks if the return expression is correct.
KXmlSerializer	traverseIteratorTree(KXmlSerializer serializer)

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

TransformIterator

public TransformIterator(Context ctx,
                         XDMIterator[] copyExprs,
                         QName[] copyVars,
                         XDMIterator modifyExpr,
                         XDMIterator returnExpr,
                         QueryLocation location)

Constructor

Parameters:

copyExprs - copy expression

copyVars - variables in which the copy expression are safed.

modifyExpr - modifying expression

returnExpr - return expression

Method Detail

setResettable

public void setResettable(boolean r)
                   throws MXQueryException

Checks if the return expression is correct.

Specified by:

setResettable in interface XDMIterator

Overrides:

setResettable in class Iterator

Parameters:

r - true make this iterator resetable, false make it not resetable

Throws:

MXQueryException

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

getAllSubIters

public XDMIterator[] getAllSubIters()

Specified by:

getAllSubIters in interface XDMIterator

Overrides:

getAllSubIters in class Iterator

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

copy

public XDMIterator copy(Context parentIterContext,
                        XQStaticContext prevParentIterContext,
                        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

prevParentIterContext - 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