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java.lang.Objectorg.basex.data.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.ParseExpr
org.basex.query.expr.Arr
org.basex.query.expr.CFrag
org.basex.query.expr.CName
public abstract class CName
Abstract fragment constructor with a QName argument.
Nested Class Summary |
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Nested classes/interfaces inherited from class org.basex.query.expr.Expr |
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Expr.Flag |
Field Summary |
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Fields inherited from class org.basex.query.expr.Arr |
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expr |
Fields inherited from class org.basex.query.expr.ParseExpr |
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info, size, type |
Method Summary | |
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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 ctx,
VarScope scp)
Compiles and optimizes the expression, assigns data types and cardinalities. |
VarUsage |
count(Var v)
Checks how often a variable is used in this expression. |
java.lang.String |
description()
Returns a string description of the 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 ctx,
VarScope scp,
Var v,
Expr e)
Inlines an expression into this one, replacing all references to the given variable. |
void |
plan(FElem plan)
Creates an expression tree. |
boolean |
removable(Var v)
Checks if the specified variable is replaceable by a context item. |
java.lang.String |
toString()
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Methods inherited from class org.basex.query.expr.CFrag |
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item, toString |
Methods inherited from class org.basex.query.expr.Arr |
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allAreValues, checkNoUp, copyAll, indexEquivalent |
Methods inherited from class org.basex.query.expr.ParseExpr |
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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, iter, optPre, preEval, size, test, type, value |
Methods inherited from class org.basex.query.expr.Expr |
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addText, compEbv, copy, copy, hasFreeVars, indexAccessible, inlineAll, isEmpty, isFunction, isItem, isVacuous, isValue, iterable, markTailCalls, optimize, sameAs, uses, visitAll |
Methods inherited from class org.basex.data.ExprInfo |
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addPlan, addPlan, info, planAttr, planElem |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Method Detail |
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public final void checkUp() throws QueryException
Expr
checkUp
in class Arr
QueryException
- query exceptionpublic Expr compile(QueryContext ctx, VarScope scp) throws QueryException
Expr
compile
in class Arr
ctx
- query contextscp
- variable scope
QueryException
- query exceptionpublic boolean removable(Var v)
Expr
Preds.removable(org.basex.query.var.Var)
, if one of the variables is used within a predicate.MixedPath.removable(org.basex.query.var.Var)
, if the variable occurs within the path.GFLWOR.compile(org.basex.query.QueryContext, org.basex.query.var.VarScope)
to rewrite where clauses
into predicates.
removable
in class Arr
v
- variable to be replaced
public final boolean has(Expr.Flag flag)
Expr
Expr.compile(org.basex.query.QueryContext, org.basex.query.var.VarScope)
methods to test properties of sub-expressions.
It returns true
if at least one test is successful.
has
in class CFrag
flag
- flag to be found
public final void plan(FElem plan)
ExprInfo
plan
in class Arr
plan
- root elementpublic final java.lang.String description()
ExprInfo
ExprInfo.toString()
method,
arguments are not included in the output.
description
in class ExprInfo
public final java.lang.String toString()
toString
in class ExprInfo
public final boolean accept(ASTVisitor visitor)
Expr
accept
in class Arr
visitor
- visitor
public final VarUsage count(Var v)
Expr
count
in class Arr
v
- variable to look for
VarUsage
public Expr inline(QueryContext ctx, VarScope scp, Var v, Expr e) throws QueryException
Expr
inline
in class Arr
ctx
- query context for recompilationscp
- variable scope for recompilationv
- variable to replacee
- expression to inline
null
otherwise
QueryException
- query exceptionpublic final int exprSize()
Expr
exprSize
in class Arr
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