org.basex.query.expr
Class CAttr

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.CFrag
                  extended by org.basex.query.expr.CAttr

public final class CAttr
extends CFrag

Attribute fragment.

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
CAttr(Expr n, Expr[] v, boolean c)
          Constructor.
 
Method Summary
 FAttr atomic(QueryContext ctx)
          Evaluates the expression and returns the resulting item or a null reference.
 Expr comp(QueryContext ctx)
          Optimizes and compiles the expression.
 String info()
          Returns a string description of the expression.
 void plan(Serializer ser)
          Recursively sends the abstract syntax of this expression to the specified serializer.
 Expr remove(Var v)
          Removes the specified variable in a sub expression.
 String toString()
           
 
Methods inherited from class org.basex.query.expr.CFrag
returned, uses
 
Methods inherited from class org.basex.query.expr.Arr
duplicates, indexEquivalent, removable
 
Methods inherited from class org.basex.query.expr.Expr
addText, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, iter, sameAs, size, test, v
 
Methods inherited from class org.basex.query.ExprInfo
color, name
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

CAttr

public CAttr(Expr n,
             Expr[] v,
             boolean c)
Constructor.

Parameters:
n - name
v - attribute values
c - computed construction flag
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

atomic

public FAttr atomic(QueryContext ctx)
             throws QueryException
Description copied from class: Expr
Evaluates the expression and returns the resulting item or a null reference. If this method is not overwritten, Expr.iter(org.basex.query.QueryContext) must be implemented.

Specified by:
atomic in class CFrag
Parameters:
ctx - query context
Returns:
iterator
Throws:
QueryException - query exception

remove

public Expr remove(Var v)
Description copied from class: Expr
Removes the specified variable in a sub expression.

Overrides:
remove in class Arr
Parameters:
v - variable to be removed
Returns:
expression with removed variable

plan

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

Overrides:
plan in class Arr
Parameters:
ser - serializer
Throws:
IOException - I/O exception

info

public String info()
Description copied from class: ExprInfo
Returns a string description of the expression. Contrary to the ExprInfo.toString() method, arguments are not included in the output.

Overrides:
info in class ExprInfo
Returns:
result of check

toString

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