# CSE 1105 Collaborative Software Engineering Project

## Dependency Injection

> **Dependent-on components** not managed by the component anymore, but need to be provided (injected) from outside.

### Dependency Inversion Principle

Traditional Control Flow:

- App calls/uses Library

Inverted Control Flow:

- App calls interface
- the Library implements the interface

The high-level code no longer depends on the low-level code, both depend on abstractions.

For example:

```java
public interface RailObject {
    boolean isRunning();

    void setDestination(String destinationName);

    Duration getRunningTime();
}

public interface RailController {
    private RailObject[] objects;

    public RailController(RailObject[] objects) {
        this.objects = objects;
    }

    public void setAllDestinations(StationDataSet stops) {
        for (RailObject object : objects) {
            // sommige dingen doen
            ...
        }
    }
}
```

Here, a `RailObject` can be implemented by any class, as long as they provide the right interface methods, `isRunning`, `setDestination`, `getRunningTime`. This decouples `RailController` from a specific implementation of `RailObject`, like `Train`, such that the controller can be used for more objects.

## JavaFX

## Spring Boot