BAEL-1554 (#3864)

* BAEL-1554 - Flips code

* BAEL-1554 - Flips code, round 2

* BAEL-1554 - Guide to Flips

* BAEL-1554 - update read me

* BAEL-1554 - rename "Thing" to "Foo"

* BAEL-1554 - rename module to spring-4

spring-4/src/main/java/com/baeldung/flips/controller/FlipController.java

@@ -0,0 +1,65 @@
+package com.baeldung.flips.controller;
+
+import com.baeldung.flips.model.Foo;
+import com.baeldung.flips.service.FlipService;
+import org.flips.annotation.FlipOnDateTime;
+import org.flips.annotation.FlipOnDaysOfWeek;
+import org.flips.annotation.FlipOnEnvironmentProperty;
+import org.flips.annotation.FlipOnProfiles;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.time.DayOfWeek;
+import java.util.List;
+
+@RestController
+public class FlipController {
+
+    private FlipService flipService;
+
+    @Autowired
+    public FlipController(FlipService flipService) {
+        this.flipService = flipService;
+    }
+
+    @RequestMapping(value = "/foos", method = RequestMethod.GET)
+    @FlipOnProfiles(activeProfiles = "dev")
+    public List<Foo> getAllFoos() {
+        return flipService.getAllFoos();
+    }
+
+    @RequestMapping(value = "/foo/{id}", method = RequestMethod.GET)
+    @FlipOnDaysOfWeek(daysOfWeek = {
+        DayOfWeek.MONDAY, DayOfWeek.TUESDAY, DayOfWeek.WEDNESDAY, DayOfWeek.THURSDAY,
+        DayOfWeek.FRIDAY, DayOfWeek.SATURDAY, DayOfWeek.SUNDAY
+    })
+    public Foo getFooByNewId(@PathVariable int id) {
+        return flipService.getFooById(id).orElse(new Foo("Not Found", -1));
+    }
+
+    @RequestMapping(value = "/foo/last", method = RequestMethod.GET)
+    @FlipOnDateTime(cutoffDateTimeProperty = "last.active.after")
+    public Foo getLastFoo() {
+        return flipService.getLastFoo();
+    }
+
+    @RequestMapping(value = "/foo/first", method = RequestMethod.GET)
+    @FlipOnDateTime(cutoffDateTimeProperty = "first.active.after")
+    public Foo getFirstFoo() {
+        return flipService.getLastFoo();
+    }
+
+    @RequestMapping(value = "/foos/{id}", method = RequestMethod.GET)
+    @FlipOnEnvironmentProperty(property = "feature.foo.by.id", expectedValue = "Y")
+    public Foo getFooById(@PathVariable int id) {
+        return flipService.getFooById(id).orElse(new Foo("Not Found", -1));
+    }
+
+    @RequestMapping(value = "/foo/new", method = RequestMethod.GET)
+    public Foo getNewThing() {
+        return flipService.getNewFoo();
+    }
+}