Package org.basex.query.func.fn
Class FnBoolean
- 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.FnBoolean
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public final class FnBoolean 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 FnBoolean()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Bln
item(QueryContext qc, InputInfo ii)
Evaluates the expression and returns the resulting item, orEmpty.VALUE
if the expression yields an empty sequence.protected Expr
opt(CompileContext cc)
Performs function specific optimizations.protected void
simplifyArgs(CompileContext cc)
Simplifies the types of all arguments.Expr
simplifyFor(CompileContext.Simplify mode, CompileContext cc)
Simplifies the expression.-
Methods inherited from class org.basex.query.func.StandardFunc
checkPerm, coerceFunc, compileData, copy, dataLock, defined, description, embed, equals, has, optFirst, optFirst, optimize, serialize, 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, iter, 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, value
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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, 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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item
public Bln item(QueryContext qc, InputInfo ii) throws QueryException
Description copied from class:Expr
Evaluates the expression and returns the resulting item, orEmpty.VALUE
if the expression yields an empty sequence. If this method is not implemented,Expr.value(QueryContext)
must be implemented instead.- Overrides:
item
in classParseExpr
- Parameters:
qc
- query contextii
- input info (only required bySeq
instances, which have no input info)- Returns:
- item or
Empty.VALUE
- 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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simplifyArgs
protected void simplifyArgs(CompileContext cc) throws QueryException
Description copied from class:StandardFunc
Simplifies the types of all arguments. This function is overwritten by functions that rely on the original argument type.- Overrides:
simplifyArgs
in classStandardFunc
- Parameters:
cc
- compilation context- Throws:
QueryException
- query exception
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simplifyFor
public Expr simplifyFor(CompileContext.Simplify mode, CompileContext cc) throws QueryException
Description copied from class:Expr
Simplifies the expression. Overwritten by many expressions; callsExpr.simplify(Simplify, CompileContext)
otherwise.- Overrides:
simplifyFor
in classExpr
- Parameters:
mode
- mode of simplificationcc
- compilation context- Returns:
- simplified or original expression
- Throws:
QueryException
- query exception- See Also:
CompileContext.Simplify
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