com.sun.tools.javac.comp
Class Lower.EnumMapping

java.lang.Object
  com.sun.tools.javac.comp.Lower.EnumMapping

Enclosing class:

Lower

 class Lower.EnumMapping
extends java.lang.Object

This map gives a translation table to be used for enum switches.

For each enum that appears as the type of a switch expression, we maintain an EnumMapping to assist in the translation, as exemplified by the following example:

we translate

          switch(colorExpression) {
          case red: stmt1;
          case green: stmt2;
          }
  

into

          switch(Outer$0.$EnumMap$Color[colorExpression.ordinal()]) {
          case 1: stmt1;
          case 2: stmt2
          }
  

with the auxilliary table intialized as follows:

          class Outer$0 {
              synthetic final int[] $EnumMap$Color = new int[Color.values().length];
              static {
                  try { $EnumMap$Color[red.ordinal()] = 1; } catch (NoSuchFieldError ex) {}
                  try { $EnumMap$Color[green.ordinal()] = 2; } catch (NoSuchFieldError ex) {}
              }
          }
  

class EnumMapping provides mapping data and support methods for this translation.

Field Summary

(package private) Symbol.TypeSymbol	forEnum
(package private) Symbol.VarSymbol	mapVar
(package private) int	next
(package private) JCDiagnostic.DiagnosticPosition	pos
(package private) java.util.Map<Symbol.VarSymbol,java.lang.Integer>	values

Constructor Summary

Lower.EnumMapping(JCDiagnostic.DiagnosticPosition pos, Symbol.TypeSymbol forEnum)

Method Summary

(package private) JCTree.JCLiteral	forConstant(Symbol.VarSymbol v)
(package private) void	translate()

Methods inherited from class java.lang.Object

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

Field Detail

pos

JCDiagnostic.DiagnosticPosition pos

next

int next

forEnum

final Symbol.TypeSymbol forEnum

mapVar

final Symbol.VarSymbol mapVar

values

final java.util.Map<Symbol.VarSymbol,java.lang.Integer> values

Constructor Detail

Lower.EnumMapping

Lower.EnumMapping(JCDiagnostic.DiagnosticPosition pos,
                  Symbol.TypeSymbol forEnum)

Method Detail

forConstant

JCTree.JCLiteral forConstant(Symbol.VarSymbol v)

translate

void translate()