Spring versioning

Spring REST API versioning through annotations in enum.

This is example that solve problem of versioning Spring REST API in the elegant way.

Description

Suppose we have API v1 and v2 that could be represented as enum:

public enum ApiVersion {
    V1("v1"), V2("v2");
    private final String code;
    ...
}

And we want to use this enum in mapping like this:

@Controller
public class FooController
{
    @RestVersion(version = ApiVersion.V2)
    @RequestMapping("{version}/foo")
    public ResponseEntity<String> foo(final @PathVariable String version) { ... }
    
    @RestVersion(version = ApiVersion.V1)
    @RequestMapping("{version}/foo")
    public ResponseEntity<String> foo_v1(final @PathVariable String version) { ... }
}

We could reach this by RequestCondition mechanism.