Package org.basex.query.expr
Class Union
java.lang.Object
org.basex.query.expr.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.ParseExpr
org.basex.query.expr.Arr
org.basex.query.expr.Union
Union expression.
- Author:
- BaseX Team 2005-21, BSD License, Christian Gruen
-
Field Summary
-
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncopy(CompileContext cc, IntObjMap<Var> vm) Copies an expression.data()Returns the data reference bound to this expression.final booleanddo()Indicates if this expression returns nodes in document order without duplicates.booleanThis function is e.g.final Iteriter(QueryContext qc) Evaluates the expression and returns an iterator on the resulting items.final ExprOptimizes an already compiled expression without recompiling its sub-expressions.final voidCreates a query plan.final voidplan(QueryString qs) Creates a query string.final Valuevalue(QueryContext qc) Evaluates the expression and returns the resulting value.Methods inherited from class org.basex.query.expr.Arr
accept, allAreValues, args, checkUp, compile, copyAll, count, exprSize, flatten, has, inline, 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, item, 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, toZeroTokenMethods inherited from class org.basex.query.expr.Expr
arg, atomItem, atomIter, data, funcType, hasFreeVars, indexAccessible, isSimple, markTailCalls, mergeEbv, simplifyFor, typeCheck, uses, vacuous, visitAllMethods inherited from class org.basex.query.expr.ExprInfo
description, toErrorString, toString
-
Constructor Details
-
Union
Constructor.- Parameters:
info- input infoexprs- expressions
-
-
Method Details
-
data
Description copied from class:Expr -
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
-
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.
-
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
-
iter
Description copied from class:ExprEvaluates the expression and returns an iterator on the resulting items. The implementation of this method is optional.- Overrides:
iterin classParseExpr- Parameters:
qc- query context- Returns:
- iterator
- Throws:
QueryException- query exception
-
value
Description copied from class:ExprEvaluates the expression and returns the resulting value. If this method is not implemented,Expr.item(QueryContext, InputInfo)must be implemented instead.- Overrides:
valuein classParseExpr- Parameters:
qc- query context- Returns:
- value
- Throws:
QueryException- query exception
-
ddo
public final boolean ddo()Description copied from class:ExprIndicates if this expression returns nodes in document order without duplicates. -
plan
Description copied from class:ExprInfoCreates a query plan. -
plan
Description copied from class:ExprInfoCreates a query string.
-