Add utility function for accessing hidden object constructors with reflection

src/main/java/biomesoplenty/common/init/ModItems.java

@@ -11,7 +11,6 @@ package biomesoplenty.common.init;
 import static biomesoplenty.api.item.BOPItems.*;
 import static biomesoplenty.api.item.BOPItemHelper.*;
 
-import java.lang.reflect.Constructor;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -30,6 +29,7 @@ import net.minecraftforge.fml.relauncher.Side;
 import biomesoplenty.api.block.BOPBlocks;
 import biomesoplenty.common.command.BOPCommand;
 import biomesoplenty.common.item.*;
+import biomesoplenty.common.util.BOPReflectionHelper;
 import biomesoplenty.common.util.inventory.CreativeTabBOP;
 import biomesoplenty.core.BiomesOPlenty;
 
@@ -141,30 +141,10 @@ public class ModItems
         // no repair item for amethyst tool - they can't be repaired
 
         // ItemAxe and ItemPickaxe have protected constructors - use reflection to construct
-        // TODO use utility functions for this
+        mud_axe = registerItem(BOPReflectionHelper.construct(ItemAxe.class, mud_tool_material), "mud_axe");
-        Constructor<ItemAxe> axeConstructor;
+        mud_pickaxe = registerItem(BOPReflectionHelper.construct(ItemPickaxe.class, mud_tool_material), "mud_pickaxe");
-        try
+        amethyst_axe = registerItem(BOPReflectionHelper.construct(ItemAxe.class, amethyst_tool_material), "amethyst_axe");
-        {
+        amethyst_pickaxe = registerItem(BOPReflectionHelper.construct(ItemPickaxe.class, amethyst_tool_material), "amethyst_pickaxe");
-            axeConstructor = ItemAxe.class.getDeclaredConstructor(ToolMaterial.class);
-            axeConstructor.setAccessible(true);
-            mud_axe = registerItem(axeConstructor.newInstance(mud_tool_material), "mud_axe");
-            amethyst_axe = registerItem(axeConstructor.newInstance(amethyst_tool_material), "amethyst_axe");
-        }
-        catch (Exception e)
-        {
-            e.printStackTrace();
-        }
-        try
-        {
-            Constructor<ItemPickaxe> pickaxeConstructor = ItemPickaxe.class.getDeclaredConstructor(ToolMaterial.class);
-            pickaxeConstructor.setAccessible(true);  
-            mud_pickaxe = registerItem(pickaxeConstructor.newInstance(mud_tool_material), "mud_pickaxe");
-            amethyst_pickaxe = registerItem(pickaxeConstructor.newInstance(amethyst_tool_material), "amethyst_pickaxe");
-        }
-        catch (Exception e)
-        {
-            e.printStackTrace();
-        }
                 
         // the other tools have public constructors, so we create instances in the normal way
         mud_hoe = registerItem(new ItemHoe(mud_tool_material), "mud_hoe");

src/main/java/biomesoplenty/common/util/BOPReflectionHelper.java

@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright 2014, the Biomes O' Plenty Team
+ * 
+ * This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License.
+ * 
+ * To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.
+ ******************************************************************************/
+
+package biomesoplenty.common.util;
+
+import java.lang.reflect.Constructor;
+
+public class BOPReflectionHelper
+{    
+    
+    // Construct an instance of the given class using the given parameters in the constructor
+    // Works on constructors which aren't usually accessible
+    public static <T> T construct(Class<T> clazz, Object... args)
+    {
+        try {
+            Class<?>[] argClasses = new Class<?>[args.length];
+            for (int i = 0; i < args.length; i++)
+            {
+                argClasses[i] = args[i].getClass();
+            }
+            Constructor<T> constructor = clazz.getDeclaredConstructor(argClasses);
+            constructor.setAccessible(true);
+            return constructor.newInstance(args);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+    
+}

src/main/java/biomesoplenty/common/util/ReflectionHelper.java

@@ -1,15 +0,0 @@
-/*******************************************************************************
- * Copyright 2014, the Biomes O' Plenty Team
- * 
- * This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License.
- * 
- * To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.
- ******************************************************************************/
-
-package biomesoplenty.common.util;
-
-public class ReflectionHelper
-{
-    // Various fields used in Reflection. These should be checked with every
-    // update.
-}