Package org.basex.query.func.fn

Class FnExists

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.func.StandardFunc

org.basex.query.func.fn.FnEmpty

org.basex.query.func.fn.FnExists

public final class FnExists
extends FnEmpty

Function implementation.

Author:

BaseX Team 2005-24, BSD License, Christian Gruen

Field Summary

Fields inherited from class org.basex.query.func.StandardFunc

definition

Fields inherited from class org.basex.query.expr.Arr

exprs

Fields inherited from class org.basex.query.expr.ParseExpr

exprType, info

Constructor Summary

Constructors

Constructor	Description
FnExists()

Method Summary

Modifier and Type	Method	Description
Expr	simplifyFor(CompileContext.Simplify mode, CompileContext cc)	Simplifies the expression.
boolean	test(QueryContext qc, InputInfo ii, long pos)	Computes the effective boolean value for this expression.

Methods inherited from class org.basex.query.func.fn.FnEmpty

item, mergeEbv, opt, simplifyArgs

Methods inherited from class org.basex.query.func.StandardFunc

arity, checkPerm, coerceFunc, coerceFunc, compileData, copy, dataLock, defined, description, embed, equals, has, hasCTX, hasUPD, hofIndex, invoke, optFirst, optFirst, optimize, refineFunc, serialize, test, toBaseUri, toBindings, toCollation, toCollation, toContent, toContent, toData, toDate, toDBNode, toEncodingOrNull, toEncodingOrNull, toFunction, toFunction, toFunctionOrNull, toGregorian, toIO, toIO, toMs, toName, toNodeOrAtomItem, toOptions, toOptions, toOptions, toPath, toPath, toSerializerOptions, toStr, toString, toXml, toZeroStr, vacuous

Methods inherited from class org.basex.query.expr.Arr

accept, arg, args, checkUp, compile, copyAll, count, exprSize, flatten, inline, inlineable, mayBePositional, removeEmpty, simplifyAll, values

Methods inherited from class org.basex.query.expr.ParseExpr

adoptType, atomValue, checkAllUp, checkNoneUp, checkNoUp, checkType, checkType, checkUp, copyType, ctxValue, data, info, iter, refineType, sc, seqType, size, toArray, toArray, toAtomItem, toBin, toBin, toBinOrNull, toBoolean, toBoolean, toBooleanOrFalse, toBytes, toBytes, toDouble, toDouble, toElem, toElem, toEnum, toFloat, toFunction, toLong, toLong, toLong, toMap, toMap, toNode, toNode, toNodeOrNull, toNumber, toNumber, toNumberOrNull, toQNm, toQNmOrNull, toRecord, toString, toString, toStringOrNull, toToken, toToken, toTokenOrNull, toZeroToken, value

Methods inherited from class org.basex.query.expr.Expr

arg, atomItem, atomIter, ddo, funcType, hasFreeVars, indexAccessible, info, isSimple, markTailCalls, optimizePos, simplify, typeCheck, uses, visitAll

Methods inherited from class org.basex.query.expr.ExprInfo

toErrorString, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

FnExists

public FnExists()

Method Detail

test

public boolean test(QueryContext qc,
                    InputInfo ii,
                    long pos)
             throws QueryException

Description copied from class: Expr

Computes the effective boolean value for this expression.

Overrides:

test in class FnEmpty

Parameters:

qc - query context

ii - input info (can be null); required for those Value instances that have no input info)

pos - position of context item (if 0, perform EBV test)

Returns:

item

Throws:

QueryException - query exception

simplifyFor

public Expr simplifyFor(CompileContext.Simplify mode,
                        CompileContext cc)
                 throws QueryException

Description copied from class: Expr

Simplifies the expression. Overwritten by many expressions; calls Expr.simplify(Simplify, CompileContext) otherwise.

Overrides:

simplifyFor in class Expr

Parameters:

mode - mode of simplification

cc - compilation context

Returns:

simplified or original expression

Throws:

QueryException - query exception

See Also:

CompileContext.Simplify