org.basex.query.gflwor
Class Window.Condition

java.lang.Object
  extended by org.basex.data.ExprInfo
      extended by org.basex.query.expr.Expr
          extended by org.basex.query.expr.ParseExpr
              extended by org.basex.query.expr.Single
                  extended by org.basex.query.gflwor.Window.Condition
Enclosing class:
Window

public static final class Window.Condition
extends Single

A window start of end condition.

Author:
BaseX Team 2005-12, BSD License, Leo Woerteler

Nested Class Summary
 
Nested classes/interfaces inherited from class org.basex.query.expr.Expr
Expr.Flag
 
Field Summary
 
Fields inherited from class org.basex.query.expr.Single
expr
 
Fields inherited from class org.basex.query.expr.ParseExpr
info, size, type
 
Constructor Summary
Window.Condition(boolean st, Var it, Var p, Var pr, Var nx, Expr cond, InputInfo ii)
          Constructor.
 
Method Summary
 boolean accept(ASTVisitor visitor)
          Traverses this expression, notifying the visitor of declared and used variables, and checking the tree for other recursive properties.
 Expr compile(QueryContext cx, VarScope scp)
          Compiles and optimizes the expression, assigns data types and cardinalities.
 Window.Condition copy(QueryContext ctx, VarScope scp, IntObjMap<Var> vs)
          Copies an expression.
 int exprSize()
          Counts the number of expressions in this expression's sub-tree.
 Window.Condition inline(QueryContext ctx, VarScope scp, Var v, Expr e)
          Inlines an expression into this one, replacing all references to the given variable.
 Window.Condition optimize(QueryContext ctx, VarScope scp)
          Optimizes an already compiled expression without recompiling its sub-expressions.
 void plan(FElem plan)
          Creates an expression tree.
 java.lang.String toString()
           
 
Methods inherited from class org.basex.query.expr.Single
checkUp, count, has, removable
 
Methods inherited from class org.basex.query.expr.ParseExpr
checkAdmin, checkAllUp, checkBinary, checkBln, checkColl, checkCreate, checkCtx, checkDbl, checkDBNode, checkEStr, checkEStr, checkFunc, checkItem, checkItr, checkItr, checkMap, checkNode, checkNode, checkNode, checkNoEmpty, checkNoneUp, checkNoUp, checkQNm, checkStr, checkStr, checkStrBin, checkType, checkWrite, compBln, copyType, ebv, item, iter, optPre, preEval, size, test, type, value
 
Methods inherited from class org.basex.query.expr.Expr
addText, compEbv, copy, hasFreeVars, indexAccessible, indexEquivalent, inlineAll, isEmpty, isFunction, isItem, isVacuous, isValue, iterable, markTailCalls, sameAs, uses, visitAll
 
Methods inherited from class org.basex.data.ExprInfo
addPlan, addPlan, description, info, planAttr, planElem
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Window.Condition

public Window.Condition(boolean st,
                        Var it,
                        Var p,
                        Var pr,
                        Var nx,
                        Expr cond,
                        InputInfo ii)
Constructor.

Parameters:
st - start condition flag
it - item variable
p - position variable
pr - previous variable
nx - next variable
cond - condition expression
ii - input info
Method Detail

compile

public Expr compile(QueryContext cx,
                    VarScope scp)
             throws QueryException
Description copied from class: Expr
Compiles and optimizes the expression, assigns data types and cardinalities.

Overrides:
compile in class Single
Parameters:
cx - query context
scp - variable scope
Returns:
optimized expression
Throws:
QueryException - query exception

optimize

public Window.Condition optimize(QueryContext ctx,
                                 VarScope scp)
                          throws QueryException
Description copied from class: Expr
Optimizes an already compiled expression without recompiling its sub-expressions.

Overrides:
optimize in class Expr
Parameters:
ctx - query context
scp - variable scope
Returns:
optimized expression
Throws:
QueryException - query exception

inline

public Window.Condition inline(QueryContext ctx,
                               VarScope scp,
                               Var v,
                               Expr e)
                        throws QueryException
Description copied from class: Expr
Inlines an expression into this one, replacing all references to the given variable.

Overrides:
inline in class Single
Parameters:
ctx - query context for recompilation
scp - variable scope for recompilation
v - variable to replace
e - expression to inline
Returns:
resulting expression in something changed, null otherwise
Throws:
QueryException - query exception

copy

public Window.Condition copy(QueryContext ctx,
                             VarScope scp,
                             IntObjMap<Var> vs)
Description copied from class: Expr
Copies an expression. Will be useful for inlining functions, or for copying static queries.

Specified by:
copy in class Expr
Parameters:
ctx - query context
scp - variable scope for creating new variables
vs - mapping from old variable IDs to new variable copies
Returns:
copied expression

toString

public java.lang.String toString()
Specified by:
toString in class ExprInfo

plan

public void plan(FElem plan)
Description copied from class: ExprInfo
Creates an expression tree.

Overrides:
plan in class Single
Parameters:
plan - root element

accept

public boolean accept(ASTVisitor visitor)
Description copied from class: Expr
Traverses this expression, notifying the visitor of declared and used variables, and checking the tree for other recursive properties.

Overrides:
accept in class Single
Parameters:
visitor - visitor
Returns:
if the walk should be continued

exprSize

public int exprSize()
Description copied from class: Expr
Counts the number of expressions in this expression's sub-tree.

Overrides:
exprSize in class Single
Returns:
number of expressions