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Code creation for data validation [message #1822056] Wed, 26 February 2020 12:49 Go to next message
Mohan Radhakrishnan is currently offline Mohan RadhakrishnanFriend
Messages: 19
Registered: July 2009
Junior Member
Hi,

I usually come across projects that have a UI that collects data. Sometimes this data is quite complicated and many cross-validation scenarios have to be handled. We have a Java backend that validates this data using validators and Drools rules.

Code for this is boiler-plate because the domain logic is the tricky validation. There is no other complex code needed except this validation. Financial control central authorities will collect this data.

I would like to create some code to help such teams. So I started looking at JetBrains MPS and Eclipse tools. How does Eclipse xTend/xText help here ?

The code is composed of Java POJO's with validator annotations and if I could create some of it automatically it would be very interesting.

I have used Antlr for some tasks.

Thanks.

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Re: Code creation for data validation [message #1822057 is a reply to message #1822056] Wed, 26 February 2020 12:56 Go to previous messageGo to next message
Tamas Miklossy is currently offline Tamas MiklossyFriend
Messages: 157
Registered: February 2016
Senior Member
Hi Mohan,

as a starting point, you can take a look at
1. the Xtext Domainmodel Tutorial: https://www.eclipse.org/Xtext/documentation/102_domainmodelwalkthrough.html
2. the Xtext Domainmodel Example shipped with the Xtext Framework

Hope this helps,
Tamás

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Re: Code creation for data validation [message #1822063 is a reply to message #1822057] Wed, 26 February 2020 13:21 Go to previous messageGo to next message
Christian Dietrich is currently offline Christian DietrichFriend
Messages: 14665
Registered: July 2009
Senior Member
Xtext can do two things (together or independent)
- you can model the data (and or the validations - did not get how the validations derive from the data)
- you can write code generators (with the models as input)

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Code creation for data validation [message #1822097 is a reply to message #1822063] Thu, 27 February 2020 09:16 Go to previous messageGo to next message
Mohan Radhakrishnan is currently offline Mohan RadhakrishnanFriend
Messages: 19
Registered: July 2009
Junior Member
I have a XSD that is parsed and POJO is populated. I assume that the POJO can be generated too.

But mainly It is the validator that I want to generate. As I know how this Java code is structured I want to create a grammar that creates as much of the code as possible.

So the grammar is dependent on eclipse framework. But the generaed code is plain Java. Is that correct ?

Thanks,
Mohan

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Re: Code creation for data validation [message #1822104 is a reply to message #1822097] Thu, 27 February 2020 11:35 Go to previous messageGo to next message
Christian Dietrich is currently offline Christian DietrichFriend
Messages: 14665
Registered: July 2009
Senior Member
Xtext can run Standalone/Gradle/Maven; as Language Server in VSCode and others and as Eclipse Plugins.
All these make use of Eclipse/Xtext/EMF apis at modeling and generation time.
The generated code is independent of any of these
(you basically generate text that can "by chance" by compilable and executable java)

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Code creation for data validation [message #1822216 is a reply to message #1822104] Sun, 01 March 2020 16:10 Go to previous messageGo to next message
Mohan Radhakrishnan is currently offline Mohan RadhakrishnanFriend
Messages: 19
Registered: July 2009
Junior Member
Thanks. I understood some of it quickly from these links. These may help others.


https://www.youtube.com/watch?v=fXM0e00fS9o

These blogs

http://blog.efftinge.de/
https://www.nikostotz.de/blog/

Since I want to use lambdas and good functional programming patterns I found this announcement interesting.

What's new in Xtext 2.14 will be presented by Xtext committer of itemis, Holger Schill.
Major Changes in Xtext 2.14:

Java 9 and 10 Support
JUnit 5 Support

So I can use functional interfaces and lambdas. Right ?

I also read that IntelliJ 15 preview has support for XText/XTend.

XTend syntax looks odd. Is that a language in itself ? Internal DSL ?

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Re: Code creation for data validation [message #1822223 is a reply to message #1822216] Mon, 02 March 2020 06:17 Go to previous message
Christian Dietrich is currently offline Christian DietrichFriend
Messages: 14665
Registered: July 2009
Senior Member
- The IntelliJ support was dropped. But you may have a look at the Language Server Protocol which is supported by Xtext
- In Xtext 2.20+ Java is used for the most part of the code
- Xtend is a own language

=> You can write all of your Xtext related code in Java 8+ which has lambda support

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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