Package org.basex.query.func.fn
Class FnFoldLeft
- java.lang.Object
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- org.basex.query.expr.ExprInfo
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- org.basex.query.expr.Expr
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- org.basex.query.expr.ParseExpr
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- org.basex.query.expr.Arr
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- org.basex.query.func.StandardFunc
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- org.basex.query.func.fn.FnFoldLeft
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public final class FnFoldLeft extends StandardFunc
Function implementation.- Author:
- BaseX Team 2005-23, BSD License, Christian Gruen
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Field Summary
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Fields inherited from class org.basex.query.func.StandardFunc
definition, sc
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Constructor Summary
Constructors Constructor Description FnFoldLeft()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description Iter
iter(QueryContext qc)
Evaluates the expression and returns an iterator on the resulting items.protected Expr
opt(CompileContext cc)
Performs function specific optimizations.static void
opt(StandardFunc sf, CompileContext cc, boolean array, boolean left)
Refines the types of a fold function.Value
value(QueryContext qc)
Evaluates the expression and returns the resulting value.-
Methods inherited from class org.basex.query.func.StandardFunc
checkPerm, coerceFunc, compileData, copy, dataLock, defined, description, embed, equals, has, optFirst, optFirst, optimize, serialize, simplifyArgs, toBaseUri, toBindings, toCollation, toCollationOrDefault, toContent, toContent, toData, toDate, toDBNode, toEncodingOrNull, toFunction, toFunction, toIO, toIO, toMs, toName, toNodeOrAtomItem, toOptions, toOptions, toPath, toPath, toStr, toString, toXml, toZeroStr, updating, vacuous
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Methods inherited from class org.basex.query.expr.Arr
accept, allAreValues, arg, args, checkUp, compile, copyAll, count, exprSize, flatten, inline, inlineable, mayBePositional, removeEmpty, simplifyAll
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Methods inherited from class org.basex.query.expr.ParseExpr
adoptType, atomValue, checkAllUp, checkNoEmpty, checkNoEmpty, checkNoneUp, checkNoUp, checkType, checkType, checkUp, copyType, ctxValue, data, ebv, info, item, refineType, seqType, size, test, toArray, toArray, toAtomItem, toB64, toB64, toB64OrNull, toBin, toBin, toBoolean, toBoolean, toBooleanOrFalse, toBytes, toBytes, toDouble, toDouble, toElem, toElem, toFloat, toFunction, toItem, toItem, toLong, toLong, toMap, toMap, toNode, toNode, toNodeOrNull, toNumber, toNumberOrNull, toQNm, toQNmOrNull, toString, toString, toStringOrNull, toToken, toToken, toTokenOrNull, toZeroToken
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Methods inherited from class org.basex.query.expr.Expr
arg, atomItem, atomIter, ddo, funcType, hasFreeVars, indexAccessible, isSimple, markTailCalls, mergeEbv, optimizePos, simplify, simplifyFor, typeCheck, uses, visitAll
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Methods inherited from class org.basex.query.expr.ExprInfo
toErrorString, toString
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Method Detail
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value
public Value value(QueryContext qc) throws QueryException
Description copied from class:Expr
Evaluates the expression and returns the resulting value. If this method is not implemented,Expr.item(QueryContext, InputInfo)
must be implemented instead.- Overrides:
value
in classParseExpr
- Parameters:
qc
- query context- Returns:
- value
- Throws:
QueryException
- query exception
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iter
public Iter iter(QueryContext qc) throws QueryException
Description copied from class:Expr
Evaluates the expression and returns an iterator on the resulting items. The implementation of this method is optional.- Overrides:
iter
in classParseExpr
- Parameters:
qc
- query context- Returns:
- iterator
- Throws:
QueryException
- query exception
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opt
protected Expr opt(CompileContext cc) throws QueryException
Description copied from class:StandardFunc
Performs function specific optimizations.- Overrides:
opt
in classStandardFunc
- Parameters:
cc
- compilation context- Returns:
- optimized or original expression
- Throws:
QueryException
- query exception
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opt
public static void opt(StandardFunc sf, CompileContext cc, boolean array, boolean left) throws QueryException
Refines the types of a fold function.- Parameters:
sf
- functioncc
- compilation contextarray
- indicates if this is an array functionleft
- indicates if this is a left/right fold- Throws:
QueryException
- query exception
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