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ReShaper can automatically recognize if states on enums and offer to convert them to switch statements (or back). (Of course, this can only happen if the if statements are solely testing the enums and nothing else.)
Can Eclipse do something like that and how?
Eclipse can convert switch statements to if-else but not the other way around. There is already a bug open to provide a “Convert ‘if-else’ to ‘switch'” quick assist, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=348179
Update: The bug has been fixed, Starting 4.3 Milestone 1 Eclipse will support converting if-else statements to switch statements.