Add service loader example. Close #7

Common/src/main/java/com/example/examplemod/CommonClass.java

@@ -1,5 +1,6 @@
 package com.example.examplemod;
 
+import com.example.examplemod.platform.Services;
 import net.minecraft.core.Registry;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.chat.TextComponent;
@@ -11,27 +12,27 @@ import net.minecraft.world.item.TooltipFlag;
 import java.util.List;
 
 public class CommonClass {
-    
+
     // This method serves as an initialization hook for the mod. The vanilla
     // game has no mechanism to load tooltip listeners so this must be
     // invoked from a mod loader specific project like Forge or Fabric.
     public static void init() {
-        
+
-        Constants.LOG.info("Hello from Common init!");
+        Constants.LOG.info("Hello from Common init on {}! we are currently in a {} environment!", Services.PLATFORM.getPlatformName(), Services.PLATFORM.isDevelopmentEnvironment() ? "development" : "production");
         Constants.LOG.info("Diamond Item >> {}", Registry.ITEM.getKey(Items.DIAMOND));
     }
-    
+
     // This method serves as a hook to modify item tooltips. The vanilla game
     // has no mechanism to load tooltip listeners so this must be registered
     // by a mod loader like Forge or Fabric.
     public static void onItemTooltip(ItemStack stack, TooltipFlag context, List<Component> tooltip) {
-    
+
         if (!stack.isEmpty()) {
-            
+
             final FoodProperties food = stack.getItem().getFoodProperties();
-            
+
             if (food != null) {
-    
+
                 tooltip.add(new TextComponent("Nutrition: " + food.getNutrition()));
                 tooltip.add(new TextComponent("Saturation: " + food.getSaturationModifier()));
             }

Common/src/main/java/com/example/examplemod/Constants.java

@@ -5,7 +5,7 @@ import org.apache.logging.log4j.Logger;
 
 public class Constants {
 
-	public static final String MOD_ID = "multiloader";
+	public static final String MOD_ID = "examplemod";
-	public static final String MOD_NAME = "MultiLoader";
+	public static final String MOD_NAME = "Example Mod";
 	public static final Logger LOG = LogManager.getLogger(MOD_NAME);
 }

Common/src/main/java/com/example/examplemod/platform/Services.java

@@ -0,0 +1,20 @@
+package com.example.examplemod.platform;
+
+import com.example.examplemod.Constants;
+import com.example.examplemod.platform.services.IPlatformHelper;
+
+import java.util.ServiceLoader;
+
+public class Services {
+
+    public static final IPlatformHelper PLATFORM = load(IPlatformHelper.class);
+
+    public static <T> T load(Class<T> clazz) {
+
+        final T loadedService = ServiceLoader.load(clazz)
+                .findFirst()
+                .orElseThrow(() -> new NullPointerException("Failed to load service for " + clazz.getName()));
+        Constants.LOG.debug("Loaded {} for service {}", loadedService, clazz);
+        return loadedService;
+    }
+}

Common/src/main/java/com/example/examplemod/platform/services/IPlatformHelper.java

@@ -0,0 +1,26 @@
+package com.example.examplemod.platform.services;
+
+public interface IPlatformHelper {
+
+    /**
+     * Gets the name of the current platform
+     *
+     * @return The name of the current platform.
+     */
+    String getPlatformName();
+
+    /**
+     * Checks if a mod with the given id is loaded.
+     *
+     * @param modId The mod to check if it is loaded.
+     * @return True if the mod is loaded, false otherwise.
+     */
+    boolean isModLoaded(String modId);
+
+    /**
+     * Check if the game is currently in a development environment.
+     *
+     * @return True if in a development environment, false otherwise.
+     */
+    boolean isDevelopmentEnvironment();
+}

Fabric/src/main/java/com/example/examplemod/platform/FabricPlatformHelper.java

@@ -0,0 +1,24 @@
+package com.example.examplemod.platform;
+
+import com.example.examplemod.platform.services.IPlatformHelper;
+import net.fabricmc.loader.api.FabricLoader;
+
+public class FabricPlatformHelper implements IPlatformHelper {
+
+    @Override
+    public String getPlatformName() {
+        return "Fabric";
+    }
+
+    @Override
+    public boolean isModLoaded(String modId) {
+
+        return FabricLoader.getInstance().isModLoaded(modId);
+    }
+
+    @Override
+    public boolean isDevelopmentEnvironment() {
+
+        return FabricLoader.getInstance().isDevelopmentEnvironment();
+    }
+}

Fabric/src/main/resources/META-INF/services/com.example.examplemod.platform.services.IPlatformHelper

@@ -0,0 +1 @@
+com.example.examplemod.platform.FabricPlatformHelper

Forge/src/main/java/com/example/examplemod/platform/ForgePlatformHelper.java

@@ -0,0 +1,26 @@
+package com.example.examplemod.platform;
+
+import com.example.examplemod.platform.services.IPlatformHelper;
+import net.minecraftforge.fml.ModList;
+import net.minecraftforge.fml.loading.FMLLoader;
+
+public class ForgePlatformHelper implements IPlatformHelper {
+
+    @Override
+    public String getPlatformName() {
+
+        return "Forge";
+    }
+
+    @Override
+    public boolean isModLoaded(String modId) {
+
+        return ModList.get().isLoaded(modId);
+    }
+
+    @Override
+    public boolean isDevelopmentEnvironment() {
+
+        return !FMLLoader.isProduction();
+    }
+}

Forge/src/main/resources/META-INF/services/com.example.examplemod.platform.services.IPlatformHelper

@@ -0,0 +1 @@
+com.example.examplemod.platform.ForgePlatformHelper

gradle.properties

@@ -1,6 +1,6 @@
 # Project
 version=1.0.0
-group=com.blamejared.multiloader
+group=com.example.examplemod
 
 # Common
 minecraft_version=1.18.1