Apply suggestions by @kske

client/src/main/java/envoy/client/data/shortcuts/EnvoyShortcutConfig.java

@@ -26,7 +26,8 @@ public class EnvoyShortcutConfig {
 	public static void initializeEnvoyShortcuts() {
 		final var instance = GlobalKeyShortcuts.getInstance();
 
-		// Add the option to exit Linux-like with "Control" + "Q" or "Alt" + "F4"
+		// Add the option to exit with "Control" + "Q" or "Alt" + "F4" as offered by
+		// some desktop environments
 		instance.add(new KeyCodeCombination(KeyCode.Q, KeyCombination.CONTROL_DOWN), ShutdownHelper::exit);
 
 		// Add the option to logout using "Control"+"Shift"+"L" if not in login scene

client/src/main/java/envoy/client/data/shortcuts/GlobalKeyShortcuts.java

@@ -1,64 +1,26 @@
 package envoy.client.data.shortcuts;
 
 import java.util.*;
-import java.util.Map.Entry;
 
 import javafx.scene.input.KeyCombination;
 
 import envoy.client.ui.SceneContext.SceneInfo;
 
 /**
- * Contains all KeyBoardshotcuts used throughout the application.
+ * Contains all keyboard shortcuts used throughout the application.
  *
  * @author Leon Hofmeister
  * @since Envoy Client v0.3-beta
  */
 public final class GlobalKeyShortcuts {
 
-	/**
-	 * Helper class for the Entry interface.
-	 *
-	 * @author Leon Hofmeister
-	 * @since Envoy Client v0.3-beta
-	 */
-	public final class KeyCombinationAction implements Entry<KeyCombination, Runnable> {
-
-		private final KeyCombination	keys;
-		private final Runnable			action;
-
-		/**
-		 * Creates a new {@code KeyCombinationAction}.
-		 *
-		 * @param keys   the keys to press to perform the given action
-		 * @param action the action to perform
-		 * @since Envoy Client v0.3-beta
-		 */
-		public KeyCombinationAction(KeyCombination keys, Runnable action) {
-			if (keys == null || action == null) throw new NullPointerException("Cannot create key combination action");
-			this.keys	= keys;
-			this.action	= action;
-		}
-
-		@Override
-		public KeyCombination getKey() { return keys; }
-
-		@Override
-		public Runnable getValue() { return action; }
-
-		@Override
-		public Runnable setValue(Runnable none) {
-			throw new UnsupportedOperationException("Reassignment of keyboard shortcut actions is not supported");
-		}
-
-	}
-
-	private final EnumMap<SceneInfo, Collection<KeyCombinationAction>> shortcuts = new EnumMap<>(SceneInfo.class);
+	private final EnumMap<SceneInfo, Map<KeyCombination, Runnable>> shortcuts = new EnumMap<>(SceneInfo.class);
 
 	private static GlobalKeyShortcuts instance = new GlobalKeyShortcuts();
 
 	private GlobalKeyShortcuts() {
 		for (final var sceneInfo : SceneInfo.values())
-			shortcuts.put(sceneInfo, new HashSet<KeyCombinationAction>());
+			shortcuts.put(sceneInfo, new HashMap<KeyCombination, Runnable>());
 	}
 
 	/**
@@ -74,10 +36,7 @@ public final class GlobalKeyShortcuts {
 	 * @param action the action to perform
 	 * @since Envoy Client v0.3-beta
 	 */
-	public void add(KeyCombination keys, Runnable action) {
-		final var keyCombinationAction = new KeyCombinationAction(keys, action);
-		shortcuts.values().forEach(collection -> collection.add(keyCombinationAction));
-	}
+	public void add(KeyCombination keys, Runnable action) { shortcuts.values().forEach(collection -> collection.put(keys, action)); }
 
 	/**
 	 * Adds the given keyboard shortcut and its action to all scenes that are not
@@ -102,17 +61,16 @@ public final class GlobalKeyShortcuts {
 		}
 
 		// Adding the action to the remaining sceneInfos
-		final var keyCombinationAction = new KeyCombinationAction(keys, action);
 		for (final var sceneInfo : include)
-			shortcuts.get(sceneInfo).add(keyCombinationAction);
+			shortcuts.get(sceneInfo).put(keys, action);
 	}
 
 	/**
-	 * Returns all stored keyboard shortcuts for the given scene constant
+	 * Returns all stored keyboard shortcuts for the given scene constant.
 	 *
 	 * @param sceneInfo the currently loading scene
 	 * @return all stored keyboard shortcuts for this scene
 	 * @since Envoy Client v0.3-beta
 	 */
-	public Collection<KeyCombinationAction> getKeyboardShortcuts(SceneInfo sceneInfo) { return shortcuts.get(sceneInfo); }
+	public Map<KeyCombination, Runnable> getKeyboardShortcuts(SceneInfo sceneInfo) { return shortcuts.get(sceneInfo); }
 }

client/src/main/java/envoy/client/data/shortcuts/KeyboardMapping.java

@@ -8,9 +8,9 @@ import envoy.client.ui.SceneContext;
 
 /**
  * Provides methods to set the keyboard shortcuts for a specific scene.
- * Should only be implemented by Controllers of Scenes so that these methods can
+ * Should only be implemented by controllers of scenes so that these methods can
  * automatically be called inside {@link SceneContext} as soon
- * as the underlying fxml file has been loaded.
+ * as the underlying FXML file has been loaded.
  *
  * @author Leon Hofmeister
  * @since Envoy Client v0.3-beta

client/src/main/java/envoy/client/ui/SceneContext.java

@@ -106,8 +106,7 @@ public final class SceneContext implements EventListener {
 			stage.setScene(scene);
 
 			// Supply the global custom keyboard shortcuts for that scene
-			for (final var shortcut : GlobalKeyShortcuts.getInstance().getKeyboardShortcuts(sceneInfo))
-				scene.getAccelerators().put(shortcut.getKey(), shortcut.getValue());
+			scene.getAccelerators().putAll(GlobalKeyShortcuts.getInstance().getKeyboardShortcuts(sceneInfo));
 
 			// Supply the scene specific keyboard shortcuts
 			if (controller instanceof KeyboardMapping) scene.getAccelerators().putAll(((KeyboardMapping) controller).getKeyboardShortcuts());

client/src/main/java/envoy/client/ui/Startup.java

@@ -85,7 +85,7 @@ public final class Startup extends Application {
 		stage.setTitle("Envoy");
 		stage.getIcons().add(IconUtil.loadIcon("envoy_logo"));
 
-		// Configure global shortcuts used
+		// Configure global shortcuts
 		EnvoyShortcutConfig.initializeEnvoyShortcuts();
 
 		// Create scene context

client/src/main/java/envoy/client/ui/controller/SettingsScene.java

@@ -1,6 +1,6 @@
 package envoy.client.ui.controller;
 
-import java.util.*;
+import java.util.Map;
 
 import javafx.fxml.FXML;
 import javafx.scene.control.*;
@@ -45,8 +45,6 @@ public final class SettingsScene implements KeyboardMapping {
 
 	@Override
 	public Map<KeyCombination, Runnable> getKeyboardShortcuts() {
-		final var map = new HashMap<KeyCombination, Runnable>();
-		map.put(new KeyCodeCombination(KeyCode.B, KeyCombination.CONTROL_DOWN), this::backButtonClicked);
-		return map;
+		return Map.of(new KeyCodeCombination(KeyCode.B, KeyCombination.CONTROL_DOWN), this::backButtonClicked);
 	}
 }