Support java.beans.Transient anntoation

[onacit]

It seems that Genson doesn't support java.beans.Transient annotation, yet.

    //@com.owlike.genson.annotation.JsonIgnore
    @java.beans.Transient
    public int getSizeInBytes() {
    }

    public void setSizeInBytes(final int sizeInBytes) {
    }

    //@com.owlike.genson.annotation.JsonIgnore
    @java.beans.Transient
    public Format getFormatAsOneOfPredefined() {
    }

    public void setFormatAsOneOfPredefined(final Format formatAsEnum) {
    }

Here comes the output.

jackson: {"n":1,"size":1024,"format":"base64","apiKey":"6b1e65b9-4186-45c2-8981-b77a9842c4f0"}
gson:    {"n":1,"size":1024,"format":"base64","apiKey":"6b1e65b9-4186-45c2-8981-b77a9842c4f0"}
moshi:   {"apiKey":"6b1e65b9-4186-45c2-8981-b77a9842c4f0","format":"base64","n":1,"size":1024}
genson:  {"apiKey":"6b1e65b9-4186-45c2-8981-b77a9842c4f0","format":"base64","formatAsOneOfPredefined":"BASE64","n":1,"size":1024,"sizeInBytes":128}

[nicky9door]

I think this could be implemented by hooking into the code that checks for the @JsonIgnore annotation and also check for the @Transient annotation. Ideally, this should be toggled in the genson builder to avoid breaking existing code.

Alternatively, this can be quickly addressed by creating a custom BeanMutatorAccessorResolver and passing it to GensonBuilder.with

static class TransientPropResolver implements BeanMutatorAccessorResolver {
		@Override
		public Trilean isCreator(Constructor<?> constructor, Class<?> fromClass){
			if(hasTransientAnnotation(constructor)){
				return Trilean.FALSE;
			}
			return Trilean.UNKNOWN;
		}

		@Override
		public Trilean isCreator(Method method, Class<?> fromClass){
			if(hasTransientAnnotation(method)){
				return Trilean.FALSE;
			}
			return Trilean.UNKNOWN;
		}

		@Override
		public Trilean isAccessor(Field field, Class<?> fromClass){
			if(hasTransientAnnotation(field)){
				return Trilean.FALSE;
			}
			return Trilean.UNKNOWN;
		}

		@Override
		public Trilean isAccessor(Method method, Class<?> fromClass){
			if(hasTransientAnnotation(method)){
				return Trilean.FALSE;
			}
			return Trilean.UNKNOWN;
		}

		@Override
		public Trilean isMutator(Field field, Class<?> fromClass){
			if(hasTransientAnnotation(field)){
				return Trilean.FALSE;
			}
			return Trilean.UNKNOWN;
		}

		@Override
		public Trilean isMutator(Method method, Class<?> fromClass){
			if(hasTransientAnnotation(method)){
				return Trilean.FALSE;
			}
			return Trilean.UNKNOWN;
		}

		private boolean hasTransientAnnotation(AccessibleObject ac){
			return ac.getAnnotation(Transient.class) != null;
		}
	}

Genson genson = new GensonBuilder()
				.with(new TransientPropResolver())
				.create();

[EugenCepoi]

What @nicky9door suggests should work.

On a separate note, I'm not actively coding in Genson anymore but if people want to contribute and submit PRs I can review them and make new releases.

Thanks!