Package org.basex.query.expr
Class CmpN
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public final class CmpN extends Cmp
Node comparison.- Author:
- BaseX Team 2005-22, BSD License, Christian Gruen
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
CmpN.OpN
Comparators.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Expr
copy(CompileContext cc, IntObjMap<Var> vm)
Copies an expression.String
description()
Returns a string description of the expression.boolean
equals(Object obj)
This function is e.g.Expr
invert()
If possible, returns an expression with inverted operands.Item
item(QueryContext qc, InputInfo ii)
Evaluates the expression and returns the resulting item, orEmpty.VALUE
if the expression yields an empty sequence.CmpG.OpG
opG()
Returns the general comparator of the expression.Expr
optimize(CompileContext cc)
Optimizes an already compiled expression without recompiling its sub-expressions.CmpV.OpV
opV()
Returns the value comparator of the expression.void
toString(QueryString qs)
Creates a query string.void
toXml(QueryPlan plan)
Creates a query plan.-
Methods inherited from class org.basex.query.expr.Arr
accept, allAreValues, args, checkUp, compile, copyAll, count, exprSize, flatten, has, 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, toBin, toBin, toBoolean, toBoolean, toBytes, toBytes, toDouble, toDouble, toElem, toFloat, toFunction, toItem, toItem, toLong, toLong, toMap, toMap, toNode, toNode, toNodeOrNull, toNumber, toNumberOrNull, toQNm, toQNm, 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, simplifyFor, typeCheck, uses, vacuous, 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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optimize
public Expr optimize(CompileContext cc) throws QueryException
Description copied from class:Expr
Optimizes an already compiled expression without recompiling its sub-expressions.- Overrides:
optimize
in classExpr
- Parameters:
cc
- compilation context- Returns:
- optimized expression
- Throws:
QueryException
- query exception
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item
public Item 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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invert
public Expr invert()
Description copied from class:Cmp
If possible, returns an expression with inverted operands.
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opV
public CmpV.OpV opV()
Description copied from class:Cmp
Returns the value comparator of the expression.
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opG
public CmpG.OpG opG()
Description copied from class:Cmp
Returns the general comparator of the expression.
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copy
public Expr copy(CompileContext cc, IntObjMap<Var> vm)
Description copied from class:Expr
Copies 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:
copy
in 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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equals
public boolean equals(Object obj)
Description copied from class:Arr
This 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)
, in order to compare the start and end value.PathCache
, in order to find identical root values at runtime.
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description
public String description()
Description copied from class:ExprInfo
Returns a string description of the expression. This method is only called by error messages. Contrary to theExprInfo.toString()
method, arguments are not included in the output.- Overrides:
description
in classExprInfo
- Returns:
- result of check
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toXml
public void toXml(QueryPlan plan)
Description copied from class:ExprInfo
Creates a query plan.
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toString
public void toString(QueryString qs)
Description copied from class:ExprInfo
Creates a query string.
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