negated boolean

[slymz]

Is it possible to have negated boolean options?

@Parameter(names= "-nofoo", description="do not use foo")
public boolean withFoo = true; // but false if the option is given

It is occasionally more natural to expose negation as an option to the user, but work with the positive boolean in code. Current workaround for this requires an extra boolean, set during postprocessing, which becomes a bit unwieldy when such options are numerous.

Also, related, is it somehow possible to have options '-bar' and '-nobar' act as boolean toggles to the same boolean member variable?  (similarly, ugly workaround with an extra useless boolean in option set)

thx,

slymz

[Cédric Beust ♔]

That’s a good idea, I just added support for this in 1.70, which is now available on JCenter:

    @Test
    public void invertedBoolean() {
        class Args {
            @Parameter(names = {"--f"})
            private boolean f = true;
        }
        Args args = new Args();
        JCommander.newBuilder()
                .addObject(args)
                .args(new String[] { "--f"})
                .build();
        Assert.assertEquals(args.f, false);
    }

​

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Cédric

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[slymz]

works great! thanks

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[Al Le]

Does this mean that boolean @Parameter's just invert the default value?

 

Gesendet: Mittwoch, 26. April 2017 um 05:10 Uhr
Von: "Cédric Beust ♔" <ced...@beust.com>
An: jcommander <jcomm...@googlegroups.com>
Betreff: Re: [JCommander] negated boolean

 

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Cédric
 

 

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[Cédric Beust ♔]

Yes: if the flag is found on the command line, JCommander will simply invert the value the field was initialized with.

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Cédric

 

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