org.basex.query.expr
Class Range

java.lang.Object
  extended by org.basex.query.ExprInfo
      extended by org.basex.query.expr.Expr
          extended by org.basex.query.expr.Arr
              extended by org.basex.query.expr.Range

public final class Range
extends Arr

Range expression.

Author:
Workgroup DBIS, University of Konstanz 2005-10, ISC 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
 
Constructor Summary
Range(Expr e1, Expr e2)
          Constructor.
 
Method Summary
 Expr comp(QueryContext ctx)
          Optimizes and compiles the expression.
 Iter iter(QueryContext ctx)
          Evaluates the expression and returns an iterator on the resulting items.
 Return returned(QueryContext ctx)
          Indicates the return type of an expression.
 long size(QueryContext ctx)
          Returns the sequence size or 1.
 String toString()
           
 
Methods inherited from class org.basex.query.expr.Arr
duplicates, indexEquivalent, plan, removable, remove, uses
 
Methods inherited from class org.basex.query.expr.Expr
addText, atomic, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, sameAs, test, v
 
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

Range

public Range(Expr e1,
             Expr e2)
Constructor.

Parameters:
e1 - first expression
e2 - second expression
Method Detail

comp

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

Overrides:
comp in class Arr
Parameters:
ctx - query context
Returns:
optimized Expression
Throws:
QueryException - query exception

iter

public Iter iter(QueryContext ctx)
          throws QueryException
Description copied from class: Expr
Evaluates the expression and returns an iterator on the resulting items. If this method is not overwritten, Expr.atomic(org.basex.query.QueryContext) must be implemented.

Overrides:
iter in class Expr
Parameters:
ctx - query context
Returns:
resulting item
Throws:
QueryException - query exception

size

public long size(QueryContext ctx)
          throws QueryException
Description copied from class: Expr
Returns the sequence size or 1.

Overrides:
size in class Expr
Parameters:
ctx - query context
Returns:
result of check
Throws:
QueryException - query exception

returned

public Return returned(QueryContext ctx)
Description copied from class: Expr
Indicates the return type of an expression. Called by the compiler to check if expressions can be reformulated. null is returned by default.

Overrides:
returned in class Expr
Parameters:
ctx - query context
Returns:
result of check

toString

public String toString()
Specified by:
toString in class ExprInfo