org.basex.query.xquery.expr
Class TypeSwitch

java.lang.Object
  extended by org.basex.query.ExprInfo
      extended by org.basex.query.xquery.expr.Expr
          extended by org.basex.query.xquery.expr.Single
              extended by org.basex.query.xquery.expr.TypeSwitch

public final class TypeSwitch
extends Single

Typeswitch expression.

Author:
Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen

Nested Class Summary
 
Nested classes/interfaces inherited from class org.basex.query.xquery.expr.Expr
Expr.Return, Expr.Using
 
Field Summary
 Case[] cs
          Expression list.
 
Fields inherited from class org.basex.query.xquery.expr.Single
expr
 
Constructor Summary
TypeSwitch(Expr t, Case[] c, Var v, Expr r)
          Constructor.
 
Method Summary
 Expr comp(XQContext ctx)
          Optimizes and compiles the expression.
 Iter iter(XQContext ctx)
          Evaluates the expression and returns an iterator on the resulting items.
 void plan(Serializer ser)
          Recursively sends the abstract syntax of this expression to the specified serializer.
 Type returned()
          Indicates if an expression returns the specified type.
 java.lang.String toString()
           
 boolean uses(Expr.Using u)
          Indicates if an expression uses the specified type.
 
Methods inherited from class org.basex.query.xquery.expr.Expr
e, i
 
Methods inherited from class org.basex.query.ExprInfo
color, info, name
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

cs

public Case[] cs
Expression list.

Constructor Detail

TypeSwitch

public TypeSwitch(Expr t,
                  Case[] c,
                  Var v,
                  Expr r)
Constructor.

Parameters:
t - typeswitch expression
c - case expressions
v - variable
r - return expression
Method Detail

comp

public Expr comp(XQContext ctx)
          throws XQException
Description copied from class: Expr
Optimizes and compiles the expression.

Overrides:
comp in class Single
Parameters:
ctx - query context
Returns:
optimized Expression
Throws:
XQException - evaluation exception

iter

public Iter iter(XQContext ctx)
          throws XQException
Description copied from class: Expr
Evaluates the expression and returns an iterator on the resulting items.

Specified by:
iter in class Expr
Parameters:
ctx - query context
Returns:
resulting item
Throws:
XQException - evaluation exception

uses

public boolean uses(Expr.Using u)
Description copied from class: Expr
Indicates if an expression uses the specified type. Called by the compiler to check if expressions can be reformulated. true is returned by default.

Overrides:
uses in class Single
Parameters:
u - using flag
Returns:
result of check

returned

public Type returned()
Description copied from class: Expr
Indicates if an expression returns the specified type. Called by the compiler to check if expressions can be reformulated. null is returned by default.

Overrides:
returned in class Single
Returns:
result of check

toString

public java.lang.String toString()
Specified by:
toString in class ExprInfo

plan

public void plan(Serializer ser)
          throws java.io.IOException
Description copied from class: ExprInfo
Recursively sends the abstract syntax of this expression to the specified serializer.

Overrides:
plan in class Single
Parameters:
ser - serializer
Throws:
java.io.IOException - exception