@Scope(ScopeType.SESSION)
| @Name("whateverConverter")
| @Interceptors(SeamInterceptor.class)
|
| public class WhateverConveter implements Converter, Serializable {
|
| @In(create=true)
| private EntityManager em; //Hint: There needs to be an "em" in your
components.xml, see 9.4.2 of the Seam reference
|
| public String getAsString(....Object object) {
|
| return ( (Whatever) object ).getId().toString();
|
| }
|
| public Object getAsObject(....String string) {
|
| return em.find(Whatever.class, Long.valueOf(string));
|
| }
|
|
| }
This converter example would make it possible to use your Entity beans in
select menus. As I said I even added caching (even with a possibility to mark
the contained entities as dirty if changes happen) and a method to generate
SelectItems (with the same cache). But that's just an idea of the nice things
you can do with a converter.
PS: I reconstructed my converter and the caching went from an inner class
directly into my code. And now it works like a charm. Inner classes seam to
make problems in Converters, keep that in mind if you ever want to do that.
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