How do I load configuration to create a list of Shapes which inherits defaults and also support overriding?
Here is how my application.yml files looks like...
store:
default:
color: red
size: 10
shapes:
- id: square
size: 20
- id: circle
size: 30
color: black
- id: rectangle
And here is what I want...
{
"catalog": {
"shapes": [
{
"color": "red", // default
"size": 20, // override
"id": "square"
},
{
"color": "black", // override
"size": 30, // override
"id": "circle"
},
{
"color": "red", // default
"size": 10, // default
"id": "rectangle"
}
]
}
}
So far I have tried following but its missing defaults in the inheritance. In other words, the defaults never makes into Shapes object.
@lombok.Data
@Component
@ConfigurationProperties(prefix = "store")
public class Catalog {
private List<Shape> shapes;
}
@lombok.Data
public class Shape extends DefaultConfig {
private String id;
}
@lombok.Data
@ConfigurationProperties(prefix = "store.default")
@Component
public class DefaultConfig {
private String color;
private int size;
}
There's no magic way to do that. The size must be an Integer and you should post-process your configuration to apply the defaults if need to be.
Something as easy as
public class Catalog {
private final DefaultConfig defaultConfig;
public Catalog(DefaultConfig defaultConfig) { ... }
@PostConstruct
public void initialize() {
// iterate over all the shapes and if the color or size is null
// apply the default value from defalutConfig
}
}