public abstract class Simple extends ParseExpr
Modifier | Constructor and Description |
---|---|
protected |
Simple(InputInfo info)
Constructor.
|
Modifier and Type | Method and Description |
---|---|
boolean |
accept(ASTVisitor visitor)
Traverses this expression, notifying the visitor of declared and used variables,
and checking the tree for other recursive properties.
|
void |
checkUp()
Checks if all updating expressions are correctly placed.
|
Expr |
compile(QueryContext qc,
VarScope scp)
Compiles and optimizes the expression, assigns types and cardinalities.
|
VarUsage |
count(Var var)
Checks how often a variable is used in this expression.
|
int |
exprSize()
Counts the number of expressions in this expression's sub-tree.
|
boolean |
has(Expr.Flag flag)
Indicates if an expression has the specified compiler property.
|
Expr |
inline(QueryContext qc,
VarScope scp,
Var var,
Expr ex)
Inlines an expression into this one, replacing all references to the given variable.
|
void |
plan(FElem plan)
Creates an expression tree.
|
boolean |
removable(Var var)
Checks if the specified variable is replaceable by a context value.
|
atomItem, atomValue, checkAtomic, checkNoEmpty, checkNoEmpty, checkNoneUp, checkNoUp, checkType, compBln, copyType, ctxValue, ebv, item, iter, optPre, optPre, preEval, seqType, seqType, size, test, toArray, toArray, toAtomItem, toB64, toB64, toBin, toBin, toBoolean, toBoolean, toBytes, toBytes, toDouble, toDouble, toElem, toEmptyNode, toEmptyToken, toFloat, toFunc, toItem, toLong, toLong, toMap, toMap, toNode, toNode, toNumber, toQNm, toQNm, toToken, toToken, value
atomIter, copy, data, hasFreeVars, indexAccessible, inlineAll, isEmpty, isFunction, isVacuous, isValue, iterable, markTailCalls, optimize, optimizeEbv, sameAs, typeCheck, uses, visitAll
addPlan, addPlan, description, planAttr, planElem, toErrorString, toString
protected Simple(InputInfo info)
info
- input infopublic final void checkUp()
Expr
public Expr compile(QueryContext qc, VarScope scp)
Expr
QueryContext.compile()
.public boolean has(Expr.Flag flag)
Expr
true
if at least one test is successful.public boolean removable(Var var)
Expr
Preds.removable(org.basex.query.var.Var)
if one of the variables is used within a predicate.Path.removable(org.basex.query.var.Var)
if the variable occurs within the path.GFLWOR.compile(QueryContext, VarScope)
to rewrite where
clauses into predicates.public VarUsage count(Var var)
Expr
SwitchCase.countCases(org.basex.query.var.Var)
or (indirectly)
GFLWOR.inlineLets(org.basex.query.QueryContext, org.basex.query.var.VarScope)
.public Expr inline(QueryContext qc, VarScope scp, Var var, Expr ex) throws QueryException
Expr
GFLWOR.inlineLets(org.basex.query.QueryContext, org.basex.query.var.VarScope)
and For.toPredicate(org.basex.query.QueryContext, org.basex.query.var.VarScope, org.basex.query.expr.Expr)
,
and the variable reference is replaced in VarRef.inline(org.basex.query.QueryContext, org.basex.query.var.VarScope, org.basex.query.var.Var, org.basex.query.expr.Expr)
.inline
in class Expr
qc
- query context for reoptimizationscp
- variable scope for reoptimizationvar
- variable to replaceex
- expression to inlinenull
otherwiseQueryException
- query exceptionpublic void plan(FElem plan)
ExprInfo
public boolean accept(ASTVisitor visitor)
Expr
public int exprSize()
Expr
StaticFunc.inline(org.basex.query.QueryContext, org.basex.query.util.list.AnnList, org.basex.query.expr.Expr)
to check if an expression
is small enough to be inlined.Copyright © 2005–2015 BaseX Team. All rights reserved.