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Property Custom Parser? [message #1268315]

Mon, 10 March 2014 06:44

Eclipse User

Hello all

I use Sapphire 0.7, and I have a property called "Resolution" which user should be allowed to write a Matlab Expression in it like:

10+(16*2^-12)

I already made a function called "parseResolution" that takes a String input and returns either a valid double or null if parsing failed.

The problem is, many other properties validation is based upon this "Resolution" property, and I would like to avoid calling my custom "parseResolution" each time I implement a new Validation Service. Also I would like to make use of the new @Validation for all other properties that are dependent upon "Resolution".

What I'm thinking of is somehow changing how ".content()" works. Is there anything like that?

Re: Property Custom Parser? [message #1268391 is a reply to message #1268315]

Mon, 10 March 2014 08:52

Eclipse User

Yes you sure can do that with the type conversion system assuming that your custom type can be converted from a String and back again. So for your property you can set the Base type like this:

@Type( base = MatlabExpression.class )
@Label(...)
ValueProperty PROP_RESOLUTION = new ValueProperty( TYPE, "Resolution" );

Value<MatlabExpression> getResolution();
setResolution( MatlabExpression resolution );
setResolution( String resolution );

Where MatlabExpression.java is just a POJO that has a method called "doubleValue()" or something that gives the double value. Then you need to use the META-INF/sapphire-extension.xml file to register two service classes that will be used for the conversion using ConversionService<String, MatlabExpression>, one for StringToMatlabExpressionService.java and another for MatlabExpressionToStringService.java. You can see in the sapphire samples plugin some examples of how to exactly how to wire this up. http://git.eclipse.org/c/sapphire/org.eclipse.sapphire.git/tree/plugins/org.eclipse.sapphire.samples/META-INF/sapphire-extension.xml

Once you have this working you can do something like this:

 element.getResolution().content().doubleValue();

Would that work for you?

[Updated on: Mon, 10 March 2014 09:19] by Moderator

Re: Property Custom Parser? [message #1268455 is a reply to message #1268391]

Mon, 10 March 2014 10:16

Eclipse User

+1 to Greg's answer.

Re: Property Custom Parser? [message #1268964 is a reply to message #1268455]

Tue, 11 March 2014 03:46

Eclipse User

That looks great, but then, can I use "Resolution" in an EL like that?

${ Decimal == ((Physical - Offset)/Resolution.Content.doubleValue) }

Re: Property Custom Parser? [message #1268987 is a reply to message #1268964]

Tue, 11 March 2014 04:35

Eclipse User

well, I tried it and didn't work Smile

Re: Property Custom Parser? [message #1269621 is a reply to message #1268987]

Tue, 11 March 2014 23:15

Eclipse User

You are going to need to be more specific. Include your property definition, the conversion service implementations and their registrations in the extensions file.

Quote:

That looks great, but then, can I use "Resolution" in an EL like that?
${ Decimal == ((Physical - Offset)/Resolution.Content.doubleValue) }

You cannot access an arbitrary method in Sapphire EL, but you should be able to write a conversion service implementation from your Resolution object to whatever is the data type of (Physical - Offset). Then it's just...

${ Decimal == ((Physical - Offset)/Resolution.Content) }

Re: Property Custom Parser? [message #1269757 is a reply to message #1269621]

Wed, 12 March 2014 02:52

Eclipse User

http://www.i2clipart.com/cliparts/8/5/9/5/clipart-thumbs-up-happy-smiley-emoticon-8595.png

That helped a lot, thank you very much for your help Smile

[Updated on: Wed, 12 March 2014 02:53] by Moderator

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