org.basex.query.up.expr

Class Rename

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.up.expr.Rename

public final class Rename
extends Arr

Rename expression.

Author:

BaseX Team 2005-19, BSD License, Lukas Kircher

Field Summary

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 and Description
Rename(StaticContext sc, InputInfo info, Expr trg, Expr name) Constructor.

Method Summary

Modifier and Type	Method and Description
Expr	copy(CompileContext cc, IntObjMap<Var> vm) Copies an expression.
boolean	equals(Object obj) This function is e.g. called by: If.optimize(CompileContext), Switch.optimize(CompileContext), Typeswitch.optimize(CompileContext), in order to discard identical expressions.
boolean	has(Flag... flags) Indicates if an expression has one of the specified compiler properties.
Item	item(QueryContext qc, InputInfo ii) Evaluates the expression and returns the resulting item, or Empty.VALUE if the expression yields an empty sequence.
String	toString()

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

accept, allAreValues, checkUp, compile, copyAll, count, emptyExpr, exprSize, inline, inline, inlineable, plan, toString

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

adoptType, atomValue, checkAllUp, checkNoEmpty, checkNoEmpty, checkNoneUp, checkNoUp, checkType, checkType, checkUp, copyType, ctxValue, ebv, iter, seqType, size, test, toArray, toArray, toAtomItem, toB64, toB64, toBin, toBin, toBoolean, toBoolean, toBytes, toBytes, toDouble, toDouble, toElem, toEmptyNode, toEmptyToken, toFloat, toFunc, toItem, toItem, toLong, toLong, toMap, toMap, toNode, toNode, toNumber, toNumber, toQNm, toQNm, toToken, toToken, toTokenOrNull, value

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

atomItem, atomIter, data, funcType, hasFreeVars, indexAccessible, inlineAll, isSimple, isVacuous, iterable, markTailCalls, merge, optimize, optimizeEbv, typeCheck, uses, visitAll

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

description, toErrorString

Methods inherited from class java.lang.Object

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

Constructor Detail

Rename

public Rename(StaticContext sc,
              InputInfo info,
              Expr trg,
              Expr name)

Constructor.

Parameters:

sc - static context

info - input info

trg - target expression

name - new name expression

Method Detail

item

public Item item(QueryContext qc,
                 InputInfo ii)
          throws QueryException

Description copied from class: Expr

Evaluates the expression and returns the resulting item, or Empty.VALUE if the expression yields an empty sequence. If this method is not implemented, Expr.value(QueryContext) must be implemented instead.

Overrides:

item in class ParseExpr

Parameters:

qc - query context

ii - input info (only required by Seq instances, which have no input info)

Returns:

item or Empty.VALUE

Throws:

QueryException - query exception

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 by VarRef.inline(org.basex.query.var.Var, org.basex.query.expr.Expr, org.basex.query.CompileContext), FuncItem.inline(org.basex.query.expr.Expr[], org.basex.query.CompileContext), Closure.inline(org.basex.query.var.Var, org.basex.query.expr.Expr, org.basex.query.CompileContext) and StaticFunc.inline(org.basex.query.expr.Expr[], org.basex.query.CompileContext).

Specified by:

copy in class Expr

Parameters:

cc - compilation context

vm - mapping from old variable IDs to new variable copies. Required by Closure.copy(org.basex.query.CompileContext, org.basex.util.hash.IntObjMap<org.basex.query.var.Var>) and VarRef.copy(org.basex.query.CompileContext, org.basex.util.hash.IntObjMap<org.basex.query.var.Var>)

Returns:

copied expression

equals

public boolean equals(Object obj)

Description copied from class: Arr

This function is e.g. called by:

• If.optimize(CompileContext), Switch.optimize(CompileContext), Typeswitch.optimize(CompileContext), in order to discard identical expressions.
• CmpR.merge(Expr, boolean, CompileContext) or CmpSR.merge(Expr, boolean, CompileContext), in order to merge expressions with identical input.
• CmpG.optimize(CompileContext) or CmpV.optimize(CompileContext), in order to pre-evaluate equality tests.
• CmpG.optimize(CompileContext) or Pos.get(Expr, CmpV.OpV, InputInfo, CompileContext), in order to compare the start and end value.
• PathCache, in order to find identical root values at runtime.

Must be overwritten by implementing class.

Overrides:

equals in class Arr

toString

public String toString()

Specified by:

toString in class ExprInfo

has

public 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 returns true if at least flag matches an expression.

Overrides:

has in class Arr

Parameters:

flags - flags to be checked

Returns:

result of check