Trying to set a destination boolean property based on source byte[] presence?

[Ninju]

Hello all,

I am trying the following:

public class UserInfoMapper extends PropertyMap<User, UserInfo> {

    @Override

    protected void configure() {

        Converter<byte[], Boolean> isBytesNotNull = new Converter<byte[], Boolean>() {

            @Override

            public Boolean convert(MappingContext<byte[], Boolean> context) {

                return context.getSource() != null;

            }

        };

        using(isBytesNotNull).map().setPhotoAvailable(source.getPhoto());

        skip().setPhoto(null);

    }

}

But I get the following compile error:

java: method setPhotoAvailable in class com.asics.model.UserInfo cannot be applied to given types;

  required: boolean

  found: byte[]

  reason: actual argument byte[] cannot be converted to boolean by method invocation conversion

source.getPhoto() returns a byte[] while setPhotoAvailable(boolean) expects boolean

What is the right way to do this?

Thanks!

[Luis Cruz]

   Hi, try this:

using(isBytesNotNull).map(source.getPhoto()).setPhotoAvailable(null);

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[Ninju]

Close...because my setPhotoAvailable(...) takes a primitive boolean and not an object Boolean I had to 'cast' the null

        using(isBytesNotNull).map(source.getPhoto()).setPhotoAvailable(Boolean.parseBoolean(null));

But after that it worked like a charm!!

Just curious...would it possible to the generalize the converter to work with any source type.  Would the following work?

        Converter<?, Boolean> isSourceNotNull = new Converter<?, Boolean>() {

            @Override

            public Boolean convert(MappingContext<?, Boolean> context) {

                return context.getSource() != null;

            }

        };

And then I can reuse this converter in many places!!

[Jonathan Halterman]

Hey Ninju,

On Tuesday, April 16, 2013 1:04:02 PM UTC-7, Ninju wrote:

Close...because my setPhotoAvailable(...) takes a primitive boolean and not an object Boolean I had to 'cast' the null

        using(isBytesNotNull).map(source.getPhoto()).setPhotoAvailable(Boolean.parseBoolean(null));

I would think:

using(isBytesNotNull).map(source.getPhoto()).setPhotoAvailable(false);

..would work as well (for simplicity). Basically the false value is ignored since the real value is being provided by your converter. 

 

But after that it worked like a charm!!

Just curious...would it possible to the generalize the converter to work with any source type.  Would the following work?

        Converter<?, Boolean> isSourceNotNull = new Converter<?, Boolean>() {

            @Override

            public Boolean convert(MappingContext<?, Boolean> context) {

                return context.getSource() != null;

            }

        };

It depends how you register that converter for use. If you use ModelMapper.addConverter, I think you'll get an exception since the source type is not defined. You should be able to reuse your converter if you set it against individual TypeMaps:

modelMapper.createTypeMap(Source.class, Destination.class).setConverter(myConverter);

Cheers,

Jonathan

[Jonathan Halterman]

Hey Ninju,

There is one more ModelMapper abstraction that you might want to check out as an alternative to using a Converter here: Conditions. Ex:

when(Conditions.notNull).map().setPhotoAvailable(source.getPhoto());

Cheers,

Jonathan