Package org.basex.query.expr.gflwor
Class OrderKey
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.gflwor.OrderKey
Sort key.
- Author:
- BaseX Team 2005-21, BSD License, Leo Woerteler
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Field Summary
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionCompiles and optimizes the expression, assigns types and cardinalities.copy(CompileContext cc, IntObjMap<Var> vm) Copies an expression.booleanThis function is e.g.intexprSize()Counts the number of expressions in this expression's sub-tree.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, has, inline, inlineableMethods inherited from class org.basex.query.expr.ParseExpr
adoptType, atomValue, checkAllUp, checkNoEmpty, checkNoEmpty, checkNoneUp, checkNoUp, checkType, checkType, checkUp, copyType, ctxValue, ebv, item, 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, indexAccessible, isSimple, markTailCalls, mergeEbv, simplifyFor, typeCheck, uses, vacuous, visitAllMethods inherited from class org.basex.query.expr.ExprInfo
description, toErrorString, toString
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Constructor Details
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OrderKey
Constructor.- Parameters:
info- input infokey- sort key expressiondesc- descending orderleast- empty leastcoll- collation (can benull)
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Method Details
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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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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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exprSize
public int exprSize()Description copied from class:ExprCounts the number of expressions in this expression's sub-tree. This method is e.g. called byStaticFunc.inline(org.basex.query.expr.Expr[], org.basex.query.CompileContext)to check if an expression is small enough to be inlined. -
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)orCmpSR.mergeEbv(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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plan
Description copied from class:ExprInfoCreates a query plan. -
plan
Description copied from class:ExprInfoCreates a query string.
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