Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>There are several options to enforce this.</p> <ul> <li>At build time you could write <strong>tests for each</strong> of the <code>Fruit</code> classes that look for a field that satisfies your requirements.</li> <li>At build time you could write a <strong>single test</strong> that goes through your entire classpath and verifies that each <code>Fruit</code> classes satisfies your requirements. A library like <a href="https://code.google.com/p/reflections/" rel="nofollow">Reflections</a> could help you to achieve this.</li> <li>At compile time you could <a href="http://www.javalobby.org/java/forums/t17876.html" rel="nofollow"><strong>process an Annotation</strong></a>. I am not sure how you would make sure that each of your classes had an Annotation (as opposed that each class that contains an Annotation is one of the classes in your set.)</li> <li>At implementation time, as a slight variation on your request, you could <strong>use an abstract class</strong> instead of an interface and require all implementors to hand you the fixed data in the constructor. That way, you have absolute control over the behaviour.</li> <li>At runtime, <strong>while the application launches</strong>, you could check that all implementing classes satify your requirements in the same way an integration test would do it. In a scenario where third parties contribute to your API, this might be the last-stop option if you absolutely have to check it.</li> </ul> <p>I think it is best to use tests for this. You'll have all the certainty you need with far better feedback and much less effort. If tests are not an option, because you can't control the implementers, I'd go for the abstract class with enforcement during launch as a last resort.</p>
    singulars
    1. This table or related slice is empty.
    1. POJava: force implementor of an interface to have an immutable name field?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USUrs Reupke
    1. USUrs Reupke
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COSorry, in my head I didn't have a distinction between build-time and compile-time. I'll have to think about the difference. What if implementors of `Fruit` are part of a separate project? (consumers of your library)
      singulars
      1. PO
      1. USjabalsad
    2. COIt is a subtle difference to me. In this model, build time consists of several phases, of which compile time is just one specific. If you don't differentiate between them, it probably doesn't matter to you and you're well off with tests. If all are parts of separate projects, you'll either have to set up one test per project, or create one integration test that loads all the modules and performs its verification there.
      singulars
      1. PO
      1. USUrs Reupke
    3. COYeah, I understand there is a subtle difference between build and compile. In this context, I'm not sure it matters much - I am open for any solution prior to runtime. The problem is that I will not necessarily be the only consumer of the interface, I cannot force external consumers to write tests.
      singulars
      1. PO
      1. USjabalsad
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload