org.basex.query.xquery.expr
Class Pred
java.lang.Object
org.basex.query.ExprInfo
org.basex.query.xquery.expr.Expr
org.basex.query.xquery.expr.Arr
org.basex.query.xquery.expr.Pred
- Direct Known Subclasses:
- PredIter
public class Pred
- extends Arr
Predicate expression.
- Author:
- Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen
Fields inherited from class org.basex.query.xquery.expr.Arr |
expr |
Method Summary |
Expr |
comp(XQContext ctx)
Optimizes and compiles the expression. |
java.lang.String |
info()
Returns a string description of the expression. |
Iter |
iter(XQContext 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. |
java.lang.String |
toString()
|
boolean |
uses(Expr.Using u)
Indicates if an expression uses the specified type. |
Methods inherited from class org.basex.query.xquery.expr.Arr |
returned |
Methods inherited from class org.basex.query.xquery.expr.Expr |
e, i |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Pred
public Pred(Expr r,
Expr[] e)
- Constructor.
- Parameters:
r
- expressione
- predicates
comp
public final Expr comp(XQContext ctx)
throws XQException
- Description copied from class:
Expr
- Optimizes and compiles the expression.
- Overrides:
comp
in class Arr
- Parameters:
ctx
- query context
- Returns:
- optimized Expression
- Throws:
XQException
- evaluation exception
iter
public Iter iter(XQContext ctx)
throws XQException
- 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
- Throws:
XQException
- evaluation exception
uses
public final boolean uses(Expr.Using u)
- Description copied from class:
Expr
- Indicates if an expression uses the specified type.
Called by the compiler to check if expressions can be reformulated.
true is returned by default.
- Overrides:
uses
in class Arr
- Parameters:
u
- using flag
- Returns:
- result of check
toString
public final java.lang.String toString()
- Specified by:
toString
in class ExprInfo
info
public final java.lang.String info()
- Description copied from class:
ExprInfo
- Returns a string description of the expression. Contrary to the
ExprInfo.toString()
method, the current expressions aren't included
in the output.
- Overrides:
info
in class ExprInfo
- Returns:
- result of check
plan
public final void plan(Serializer ser)
throws java.io.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:
java.io.IOException
- exception