ch.ethz.mxquery.iterators
Class CastAsIterator

java.lang.Object
  ch.ethz.mxquery.model.Iterator
      ch.ethz.mxquery.model.TokenBasedIterator
          ch.ethz.mxquery.iterators.CastAsIterator

All Implemented Interfaces:

XDMIterator, Traversable

public class CastAsIterator
extends TokenBasedIterator

Implements cast as TYPE (single atomic value) and casting sequences of atomic values (for function parameters) Implemented using the xs:TYPE casting functions

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

CastAsIterator(Context ctx, XDMIterator subIters, TypeInfo typeInfo, boolean onlyCheckCastable, boolean onlyCastUntyped, QueryLocation location)

Method Summary

TypeInfo	getStaticType() Return the return type if it can be statically determined
Token	next() generate next Token, needs to be implemented by the respective iterator

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

CastAsIterator

public CastAsIterator(Context ctx,
                      XDMIterator subIters,
                      TypeInfo typeInfo,
                      boolean onlyCheckCastable,
                      boolean onlyCastUntyped,
                      QueryLocation location)

Method Detail

next

public Token next()
           throws MXQueryException

Description copied from class: TokenBasedIterator

generate next Token, needs to be implemented by the respective iterator

Specified by:

next in interface XDMIterator

Overrides:

next in class TokenBasedIterator

Returns:

The first call will give the type of first Token of the result, the second the second and so on. When the last token has been produced, the type of an END_SEQUENCE token will be returned

Throws:

MXQueryException

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*