Package org.basex.query.expr
Class And
And expression.
- Author:
- BaseX Team 2005-21, BSD License, Christian Gruen
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Field Summary
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncopy(CompileContext cc, IntObjMap<Var> vm) Copies an 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.Optimizes an already compiled expression without recompiling its sub-expressions.voidplan(QueryString qs) Creates a query string.Methods inherited from class org.basex.query.expr.Logical
compile, inline, markTailCalls, planMethods inherited from class org.basex.query.expr.Arr
accept, allAreValues, args, checkUp, copyAll, count, exprSize, flatten, has, inline, inlineable, mayBePositional, simplifyAllMethods 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, atomItem, atomIter, data, data, ddo, funcType, hasFreeVars, isSimple, 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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And
Constructor.- Parameters:
info- input infoexprs- expressions
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Method Details
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optimize
Description copied from class:ExprOptimizes an already compiled expression without recompiling its sub-expressions.- Overrides:
optimizein classExpr- 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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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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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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equals
Description copied from class:ArrThis 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 string.
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