org.basex.query.expr

Class TypeCase

java.lang.Object

org.basex.data.ExprInfo

org.basex.query.expr.Expr

org.basex.query.expr.ParseExpr

org.basex.query.expr.Single

org.basex.query.expr.TypeCase

public final class TypeCase
extends Single

Case expression for typeswitch.

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.Single

expr

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

input, size, type

Constructor Summary

Constructors

Constructor and Description
TypeCase(InputInfo ii, Var v, Expr r) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
TypeCase	comp(QueryContext ctx) Compiles and optimizes the expression, assigns data types and cardinalities.
TypeCase	markTailCalls() Finds and marks tail calls, enabling TCO.
void	plan(Serializer ser) Serializes the expression tree.
java.lang.String	toString()
boolean	uses(Expr.Use u) Indicates if an expression uses the specified type or operation.

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

count, removable, remove

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, item, iter, optPre, preEval, size, test, type, value

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

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

Methods inherited from class org.basex.data.ExprInfo

description, info

Methods inherited from class java.lang.Object

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

Constructor Detail

TypeCase

public TypeCase(InputInfo ii,
        Var v,
        Expr r)

Constructor.

Parameters:

ii - input info

v - variable

r - return expression

Method Detail

comp

public TypeCase comp(QueryContext ctx)
              throws QueryException

Description copied from class: Expr

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

Overrides:

comp in class Single

Parameters:

ctx - query context

Returns:

optimized expression

Throws:

QueryException - query exception

uses

public boolean uses(Expr.Use u)

Description copied from class: Expr

Indicates if an expression uses the specified type or operation. This method is called by numerous Expr.comp(org.basex.query.QueryContext) methods to test the properties of sub-expressions. It will return true as soon as at least one test is successful.

Overrides:

uses in class Single

Parameters:

u - type/operation to be found

Returns:

result of check

plan

public void plan(Serializer ser)
          throws java.io.IOException

Description copied from class: ExprInfo

Serializes the expression tree.

Overrides:

plan in class Single

Parameters:

ser - serializer

Throws:

java.io.IOException - I/O exception

toString

public java.lang.String toString()

Specified by:

toString in class ExprInfo

markTailCalls

public TypeCase markTailCalls()

Description copied from class: Expr

Finds and marks tail calls, enabling TCO.

Overrides:

markTailCalls in class Expr

Returns:

the expression, with tail calls marked