refactor: annotation-based dependency-injection

2022-11-14 21:15:27 +01:00
parent 15279838b7
commit 5ef3f6c587
9 changed files with 188 additions and 139 deletions
@@ -0,0 +1,10 @@
+package ch.zhaw.gartenverwaltung.bootstrap;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface AfterInject { }
@@ -0,0 +1,112 @@
+package ch.zhaw.gartenverwaltung.bootstrap;
+
+import ch.zhaw.gartenverwaltung.HelloApplication;
+import ch.zhaw.gartenverwaltung.MainFXMLController;
+import ch.zhaw.gartenverwaltung.io.CropList;
+import ch.zhaw.gartenverwaltung.io.JsonCropList;
+import ch.zhaw.gartenverwaltung.io.JsonPlantList;
+import ch.zhaw.gartenverwaltung.io.JsonTaskList;
+import ch.zhaw.gartenverwaltung.io.PlantList;
+import ch.zhaw.gartenverwaltung.io.TaskList;
+import ch.zhaw.gartenverwaltung.models.Garden;
+import ch.zhaw.gartenverwaltung.models.GardenSchedule;
+import ch.zhaw.gartenverwaltung.models.PlantListModel;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.scene.layout.AnchorPane;
+import javafx.scene.layout.Pane;
+import javafx.stage.Stage;
+
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+public class AppLoader {
+    /**
+     * Caching the panes
+     */
+    private final Map<String, Pane> panes = new HashMap<>();
+
+    /**
+     * Application-wide dependencies
+     */
+    private final PlantList plantList = new JsonPlantList();
+    private final CropList cropList = new JsonCropList();
+    private final TaskList taskList = new JsonTaskList();
+
+    private final GardenSchedule gardenSchedule = new GardenSchedule(taskList, plantList);
+    private final Garden garden = new Garden(gardenSchedule, cropList);
+    private final MainFXMLController mainController;
+
+
+    public AppLoader(MainFXMLController mainController) throws IOException {
+        this.mainController = mainController;
+    }
+
+
+    public Pane loadPane(String fxmlFile) throws IOException {
+        Pane pane = panes.get(fxmlFile);
+        if (pane == null) {
+            loadAndCacheFxml(fxmlFile);
+            pane = panes.get(fxmlFile);
+        }
+        return pane;
+    }
+
+    public Object loadSceneToStage(String fxmlFile, Stage appendee) throws IOException {
+        FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
+        Pane root = loader.load();
+        appendee.setScene(new Scene(root));
+        Object controller = loader.getController();
+        annotationInject(controller);
+        return controller;
+    }
+
+    public void loadAndCacheFxml(String fxmlFile) throws IOException {
+        FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
+        AnchorPane anchorPane = loader.load();
+        panes.put(fxmlFile, anchorPane);
+        annotationInject(loader.getController());
+    }
+
+    public void annotationInject(Object controller) {
+        Arrays.stream(controller.getClass().getDeclaredFields())
+                .filter(field -> field.isAnnotationPresent(Inject.class))
+                .forEach(field -> {
+                    field.setAccessible(true);
+                    try {
+                        field.set(controller, getAppDependency(field.getType()));
+                    } catch (IllegalAccessException e) {
+                        throw new RuntimeException(e);
+                    }
+                    field.setAccessible(false);
+                });
+
+        Arrays.stream(controller.getClass().getMethods())
+                .filter(method -> method.isAnnotationPresent(AfterInject.class))
+                .forEach(afterInjectMethod -> {
+                    if (afterInjectMethod.getParameterCount() == 0) {
+                        try {
+                            afterInjectMethod.invoke(controller);
+                        } catch (IllegalAccessException | InvocationTargetException e) {
+                            e.printStackTrace();
+                        }
+                    }
+                });
+    }
+
+    private Object getAppDependency(Class<?> type) {
+        return switch (type.getSimpleName()) {
+            case "Garden" -> garden;
+            case "PlantList" -> plantList;
+            case "PlantListModel" -> new PlantListModel(plantList);
+            case "GardenSchedule" -> gardenSchedule;
+            case "MainFXMLController" -> mainController;
+            case "AppLoader" -> this;
+            default -> null;
+        };
+    }
+}
@@ -0,0 +1,10 @@
+package ch.zhaw.gartenverwaltung.bootstrap;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface Inject { }