org.basex.query.expr

Class CElem

java.lang.Object

org.basex.data.ExprInfo

org.basex.query.expr.Expr

org.basex.query.expr.ParseExpr

org.basex.query.expr.Arr

org.basex.query.expr.CFrag

org.basex.query.expr.CName

org.basex.query.expr.CElem

public final class CElem
extends CName

Element constructor.

Author:

BaseX Team 2005-12, BSD License, Christian Gruen

Nested Class Summary

Nested classes/interfaces inherited from class org.basex.query.expr.Expr

Expr.Use

Field Summary

Fields inherited from class org.basex.query.expr.Arr

expr

Fields inherited from class org.basex.query.expr.ParseExpr

input, size, type

Constructor Summary

Constructors

Constructor and Description
CElem(InputInfo ii, Expr t, Atts ns, Expr... cont) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
CElem	comp(QueryContext ctx) Compiles and optimizes the expression, assigns data types and cardinalities.
FElem	item(QueryContext ctx, InputInfo ii) Evaluates the expression and returns the resulting item or a null reference, if the expression yields an empty sequence.

Methods inherited from class org.basex.query.expr.CName

count, description, plan, remove, toString, uses

Methods inherited from class org.basex.query.expr.CFrag

toString

Methods inherited from class org.basex.query.expr.Arr

allAreValues, indexEquivalent, removable

Methods inherited from class org.basex.query.expr.ParseExpr

checkBln, checkColl, checkCreate, checkCtx, checkDbl, checkDBNode, checkEStr, checkEStr, checkIO, checkItem, checkItr, checkItr, checkMap, checkNode, checkNoEmpty, checkStr, checkType, checkUp, checkUp, checkWrite, compBln, ebv, iter, optPre, preEval, size, test, type, value

Methods inherited from class org.basex.query.expr.Expr

addText, compEbv, hasFreeVars, indexAccessible, isEmpty, isFunction, isItem, isVacuous, isValue, iterable, markTailCalls, sameAs

Methods inherited from class org.basex.data.ExprInfo

info

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CElem

public CElem(InputInfo ii,
     Expr t,
     Atts ns,
     Expr... cont)

Constructor.

Parameters:

ii - input info

t - tag

ns - namespaces, or null if this is a computed constructor.

cont - element contents

Method Detail

comp

public CElem comp(QueryContext ctx)
           throws QueryException

Description copied from class: Expr

Compiles and optimizes the expression, assigns data types and cardinalities.

Overrides:

comp in class CName

Parameters:

ctx - query context

Returns:

optimized expression

Throws:

QueryException - query exception

item

public FElem item(QueryContext ctx,
         InputInfo ii)
           throws QueryException

Description copied from class: Expr

Evaluates the expression and returns the resulting item or a null reference, if the expression yields an empty sequence. If this method is not overwritten, Expr.iter(org.basex.query.QueryContext) must be implemented by an expression, as it may be called by this method.

Specified by:

item in class CFrag

Parameters:

ctx - query context

ii - input info

Returns:

iterator

Throws:

QueryException - query exception