Package org.basex.query.expr
Class CmpSR
java.lang.Object
org.basex.query.expr.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.ParseExpr
org.basex.query.expr.Single
org.basex.query.expr.CmpSR
String range expression.
- Author:
- BaseX Team 2005-21, BSD License, Christian Gruen
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Field Summary
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Method Summary
Modifier and TypeMethodDescriptionCompiles and optimizes the expression, assigns types and cardinalities.copy(CompileContext cc, IntObjMap<Var> vm) Copies an expression.Returns a string description of the expression.booleanThis function is e.g.booleanChecks if an expression can be rewritten to an index access.item(QueryContext qc, InputInfo ii) Evaluates the expression and returns the resulting item, orEmpty.VALUEif the expression yields an empty sequence.mergeEbv(Expr ex, boolean or, CompileContext cc) Tries to merge two expressions that are part of an EBV test.Optimizes an already compiled expression without recompiling its sub-expressions.voidCreates a query plan.voidplan(QueryString qs) Creates a query string.Methods inherited from class org.basex.query.expr.Single
accept, checkUp, count, exprSize, has, inline, inlineableMethods inherited from class org.basex.query.expr.ParseExpr
adoptType, atomValue, checkAllUp, checkNoEmpty, checkNoEmpty, checkNoneUp, checkNoUp, checkType, checkType, checkUp, copyType, ctxValue, ebv, iter, refineType, seqType, size, test, toArray, toArray, toAtomItem, toB64, toB64, toBin, toBin, toBoolean, toBoolean, toBytes, toBytes, toDouble, toDouble, toElem, toFloat, toFunc, toItem, toItem, toLong, toLong, toMap, toMap, toNode, toNode, toNodeOrNull, toNumber, toNumberOrNull, toQNm, toQNm, toToken, toToken, toTokenOrNull, toZeroToken, valueMethods inherited from class org.basex.query.expr.Expr
arg, args, atomItem, atomIter, data, data, ddo, funcType, hasFreeVars, isSimple, markTailCalls, simplifyFor, typeCheck, uses, vacuous, visitAllMethods inherited from class org.basex.query.expr.ExprInfo
toErrorString, toString
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Method Details
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compile
Description copied from class:ExprCompiles and optimizes the expression, assigns types and cardinalities.- Overrides:
compilein classSingle- Parameters:
cc- compilation context- Returns:
- optimized expression
- Throws:
QueryException- query exception
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optimize
Description copied from class:ExprOptimizes an already compiled expression without recompiling its sub-expressions.- Overrides:
optimizein classSingle- Parameters:
cc- compilation context- Returns:
- optimized expression
- Throws:
QueryException- query exception
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item
Description copied from class:ExprEvaluates the expression and returns the resulting item, orEmpty.VALUEif the expression yields an empty sequence. If this method is not implemented,Expr.value(QueryContext)must be implemented instead.- Overrides:
itemin classParseExpr- Parameters:
qc- query contextii- input info (only required bySeqinstances, which have no input info)- Returns:
- item or
Empty.VALUE - Throws:
QueryException- query exception
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mergeEbv
Description copied from class:Expr -
indexAccessible
Description copied from class:ExprChecks if an expression can be rewritten to an index access. If so, the index expression will be bound toIndexInfo.expr. This method will be called by thePathexpression.- Overrides:
indexAccessiblein classExpr- Parameters:
ii- index info- Returns:
- true if an index can be used
- Throws:
QueryException- query exception
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copy
Description copied from class:ExprCopies an expression. Used for inlining functions, or for copying static queries. It is utilized byVarRef.inline(org.basex.query.InlineContext),FuncItem.inline(org.basex.query.expr.Expr[], org.basex.query.CompileContext),Closure.inline(org.basex.query.InlineContext)andStaticFunc.inline(org.basex.query.expr.Expr[], org.basex.query.CompileContext).- Specified by:
copyin classExpr- Parameters:
cc- compilation contextvm- mapping from old variable IDs to new variable copies. Required byClosure.copy(org.basex.query.CompileContext, org.basex.util.hash.IntObjMap<org.basex.query.var.Var>)andVarRef.copy(org.basex.query.CompileContext, org.basex.util.hash.IntObjMap<org.basex.query.var.Var>)- Returns:
- copied expression
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equals
Description copied from class:SingleThis function is e.g. called by:Must be overwritten by implementing class.If.optimize(CompileContext),Switch.optimize(CompileContext),Typeswitch.optimize(CompileContext), in order to discard identical expressions.CmpR.mergeEbv(Expr, boolean, CompileContext)ormergeEbv(Expr, boolean, CompileContext), in order to merge expressions with identical input.CmpG.optimize(CompileContext)orCmpV.optimize(CompileContext), in order to pre-evaluate equality tests.CmpG.optimize(CompileContext)orPos.get(Expr, CmpV.OpV, InputInfo, CompileContext), in order to compare the start and end value.PathCache, in order to find identical root values at runtime.
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description
Description copied from class:ExprInfoReturns a string description of the expression. This method is only called by error messages. Contrary to theExprInfo.toString()method, arguments are not included in the output.- Overrides:
descriptionin classExprInfo- Returns:
- result of check
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plan
Description copied from class:ExprInfoCreates a query plan. -
plan
Description copied from class:ExprInfoCreates a query string.
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