annotation problem.

[ankur trapasiya]

Hello all..

I am assigned a task to develop a custom annotation for database connectivity

public class xyz
{
@myannotation(dbname="abc",username="root",password="q")
connection con; // should be injected via annotation.
//perform db operations into the methods using this connection object.
}

Now at a very basic level i have created one annotation but it is not fulfilling my this requirement..can anyone guide me how to develop this type of annotation? I surfed and come to know that to inject an entity like in built annotations we have to use reflections. is it so ?

and there is no tutorial available for this kind of annotation also..
some expert please guide me regarding this ..


Thanks in advance............

[Rob Spoor]

http://download.oracle.com/javase/tutorial/reflect/index.html

I don't know if that's been updated to handle annotations though.
If not, then there are a few methods you need to learn after reading it:
- isAnnotationPresent checks if a specific annotation is present
- getAnnotation returns a specific annotation (or null if not present).

In your case, once you have a java.lang.reflect.Field for field "con" you get its annotation like this:

myannotation annotation = field.getAnnotation(myannotation.class);
if (annotation != null)
{
    // use its values
}