I'm just new in the spring architecture and I am wondering if it is possible to use a generic T (o what you want) in an ItemStreamReader.
Something like this:
public class Reader implements ItemStreamReader<T extends SomeClass>{
public T read() {
.......
}
public void open() {
.......
}
public void update() {
.......
}
public void close() {
.......
}
}
So I pass to the reader various objects that extends SomeClass.
this should work:
public class Reader<T extends SomeClass> implements ItemStreamReader<T>{
public T read() {
.......
}
public void open() {
.......
}
public void update() {
.......
}
public void close() {
.......
}
}
use it like:
Reader<SomeClass> reader = new Reader<>();
Reader<ExtendedFromSomeClass> reader2 = new Reader<>();
I recommend you to read first about java generics.
http://www.angelikalanger.com/GenericsFAQ/FAQSections/ParameterizedTypes.html#What is a parameterized (or generic) type?
But if you define your class
public class Reader implements ItemStreamReader<SomeClass>{
public SomeClass read() {
.......
}
public void open() {
.......
}
public void update() {
.......
}
public void close() {
.......
}
}
Your method can return any object that is Subclass of SomeClass.
For example
Reader a = new Reader();
Subclass b = (Subclass)a.read();
public abstract class Reader<T extends XInterface<R>, R extends Y, S extends Z<S, R>> implements ItemStreamReader<T> where XYZ are classes or interfaces. But thanks the guide was helpful!