org.basex.query.expr
Class Simple
java.lang.Object
org.basex.query.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.Simple
- Direct Known Subclasses:
- Context, FTIndexAccess, Pos, RangeAccess, Root
public abstract class Simple
- extends Expr
Simple expression without arguments.
- 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 |
Method Summary |
String |
color()
Returns a color string for the expression. |
Expr |
comp(QueryContext ctx)
Optimizes and compiles the expression. |
void |
plan(Serializer ser)
Recursively sends the abstract syntax of this expression to the
specified serializer. |
boolean |
uses(Expr.Use u,
QueryContext ctx)
Indicates if an expression uses the specified type. |
Methods inherited from class org.basex.query.expr.Expr |
addText, atomic, checkCtx, checkDbl, checkItr, duplicates, e, ebv, i, indexAccessible, indexEquivalent, iter, removable, remove, returned, sameAs, size, test, v |
Simple
public Simple()
comp
public final Expr comp(QueryContext ctx)
- Description copied from class:
Expr
- Optimizes and compiles the expression.
- Specified by:
comp
in class Expr
- Parameters:
ctx
- query context
- Returns:
- optimized Expression
uses
public boolean uses(Expr.Use u,
QueryContext ctx)
- Description copied from class:
Expr
- Indicates if an expression uses the specified type.
Called by the compiler to perform certain optimizations.
true
is returned by default and thus assumed as "worst-case".
- Specified by:
uses
in class Expr
- Parameters:
u
- use type to be checkedctx
- query context
- Returns:
- result of check
color
public String color()
- Description copied from class:
ExprInfo
- Returns a color string for the expression.
- Overrides:
color
in class ExprInfo
- Returns:
- color
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.
- Specified by:
plan
in class ExprInfo
- Parameters:
ser
- serializer
- Throws:
IOException
- I/O exception