org.basex.query.expr
Class For
java.lang.Object
org.basex.query.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.Single
org.basex.query.expr.ForLet
org.basex.query.expr.For
public final class For
- extends ForLet
For clause.
- Author:
- Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen
Nested classes/interfaces inherited from class org.basex.query.expr.Expr |
Expr.Use |
Fields inherited from class org.basex.query.expr.ForLet |
var |
Fields inherited from class org.basex.query.expr.Single |
expr |
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. |
void |
plan(Serializer ser)
Recursively sends the abstract syntax of this expression to the
specified serializer. |
boolean |
shadows(Var v)
Checks if the specified is not shadowed by another variable. |
String |
toString()
|
Methods inherited from class org.basex.query.expr.Expr |
addText, atomic, checkCtx, checkDbl, checkItr, duplicates, e, ebv, i, indexAccessible, indexEquivalent, sameAs, size, test, v |
For
public For(Expr e,
Var v,
Var p,
Var s)
- Constructor.
- Parameters:
e
- variable inputv
- variablep
- positional variables
- score variable
comp
public Expr comp(QueryContext ctx)
throws QueryException
- Description copied from class:
Expr
- Optimizes and compiles the expression.
- Overrides:
comp
in class Single
- Parameters:
ctx
- query context
- Returns:
- optimized Expression
- Throws:
QueryException
- query exception
iter
public Iter iter(QueryContext ctx)
- 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
shadows
public boolean shadows(Var v)
- Description copied from class:
ForLet
- Checks if the specified is not shadowed by another variable.
- Parameters:
v
- variable to be checked
- Returns:
- result of check
toString
public String toString()
- Specified by:
toString
in class ExprInfo
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 Single
- Parameters:
ser
- serializer
- Throws:
IOException
- I/O exception