org.basex.query.xquery.expr
Class Case

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.Case

public final class Case
extends Single

Case 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
 
Fields inherited from class org.basex.query.xquery.expr.Single
expr
 
Constructor Summary
Case(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.
 Type returned()
          Indicates if an expression returns the specified type.
 java.lang.String toString()
           
 
Methods inherited from class org.basex.query.xquery.expr.Single
plan, uses
 
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
 

Constructor Detail

Case

public Case(Var v,
            Expr r)
Constructor.

Parameters:
v - variable
r - return expression
Method Detail

comp

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

Overrides:
comp in class Single
Parameters:
ctx - query context
Returns:
optimized Expression

iter

public Iter iter(XQContext ctx)
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

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