Package org.basex.query.expr
Class SimpleMap
- 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.expr.SimpleMap
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
accept(ASTVisitor visitor)
Traverses this expression, notifying the visitor of declared and used variables, and checking the tree for other recursive properties.void
checkUp()
Checks if the updating semantics are satisfied.Expr
compile(CompileContext cc)
Compiles and optimizes the expression, assigns types and cardinalities.VarUsage
count(Var var)
Checks how often a variable or context reference is used in this expression.String
description()
Returns a string description of the expression.boolean
equals(Object obj)
This function is e.g.static Expr
get(CompileContext cc, InputInfo ii, Expr... exprs)
Creates a new, optimized map expression, or the first expression if only one was specified.boolean
has(Flag... flags)
Indicates if an expression has one of the specified compiler properties.Expr
inline(InlineContext ic)
Inlines an expression into this one, replacing all variable or context references.boolean
inlineable(InlineContext ic)
Checks if inlining is possible.void
markTailCalls(CompileContext cc)
Finds and marks tail calls, enabling TCO.Expr
optimize(CompileContext cc)
Optimizes an already compiled expression without recompiling its sub-expressions.Expr
simplifyFor(CompileContext.Simplify mode, CompileContext cc)
Simplifies the expression.void
toString(QueryString qs)
Creates a query string.boolean
vacuous()
Tests if this is a vacuous expression (empty sequence or error function).-
Methods inherited from class org.basex.query.expr.Arr
allAreValues, args, copyAll, exprSize, flatten, mayBePositional, removeEmpty, simplifyAll, toXml
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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, 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, copy, ddo, funcType, hasFreeVars, indexAccessible, isSimple, 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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get
public static Expr get(CompileContext cc, InputInfo ii, Expr... exprs) throws QueryException
Creates a new, optimized map expression, or the first expression if only one was specified.- Parameters:
cc
- compilation contextii
- input infoexprs
- one or more expressions- Returns:
- filter root, path or filter expression
- Throws:
QueryException
- query exception
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checkUp
public final void checkUp() throws QueryException
Description copied from class:Expr
Checks if the updating semantics are satisfied. This function is only called if any updating expression was found in the query.- Overrides:
checkUp
in classArr
- Throws:
QueryException
- query exception
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vacuous
public boolean vacuous()
Description copied from class:Expr
Tests if this is a vacuous expression (empty sequence or error function). This check is needed for updating queries.
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compile
public final Expr compile(CompileContext cc) throws QueryException
Description copied from class:Expr
Compiles and optimizes the expression, assigns types and cardinalities.- Overrides:
compile
in classArr
- Parameters:
cc
- compilation context- Returns:
- optimized expression
- Throws:
QueryException
- query exception
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optimize
public final 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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simplifyFor
public final 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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has
public final boolean has(Flag... flags)
Description copied from class:Expr
Indicates if an expression has one of the specified compiler properties. This method must only be called at compile time. It is invoked to test properties of sub-expressions. It returnstrue
if at least flag matches an expression.
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accept
public final boolean accept(ASTVisitor visitor)
Description copied from class:Expr
Traverses this expression, notifying the visitor of declared and used variables, and checking the tree for other recursive properties.
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count
public final VarUsage count(Var var)
Description copied from class:Expr
Checks how often a variable or context reference is used in this expression. This function is called by:-
Closure.optimize(org.basex.query.CompileContext)
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GFLWOR.inlineForLet(org.basex.query.CompileContext)
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GFLWOR.optimizePos(org.basex.query.CompileContext)
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GFLWOR.simplify(org.basex.query.CompileContext)
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GFLWOR.unusedVars(org.basex.query.CompileContext)
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optimize(org.basex.query.CompileContext)
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TypeswitchGroup.optimize(org.basex.query.CompileContext)
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inlineable
public final boolean inlineable(InlineContext ic)
Description copied from class:Expr
Checks if inlining is possible. This function is called byInlineContext.inlineable(org.basex.query.expr.Expr...)
and:CNode.inlineable(org.basex.query.InlineContext)
returns false if the new expression construct new nodes. The following tests might reject inlining if the expression is a context reference:- Overrides:
inlineable
in classArr
- Parameters:
ic
- inlining context- Returns:
- result of check
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inline
public final Expr inline(InlineContext ic) throws QueryException
Description copied from class:Expr
Inlines an expression into this one, replacing all variable or context references. This function is called byInlineContext.inline(Expr)
(see invocations of these functions for further inlinings). The variable reference is replaced in: The context is replaced in:- Overrides:
inline
in classArr
- Parameters:
ic
- inlining context- Returns:
- resulting expression if something has changed,
null
otherwise - Throws:
QueryException
- query exception
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markTailCalls
public void markTailCalls(CompileContext cc)
Description copied from class:Expr
Finds and marks tail calls, enabling TCO.- Overrides:
markTailCalls
in classExpr
- Parameters:
cc
- compilation context,null
if the changes should not be reported
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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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toString
public void toString(QueryString qs)
Description copied from class:ExprInfo
Creates a query string.
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