SPIGOT-4002: Fix usage of default: statements in 1.13 plugins compiled w/ Eclipse

src/main/java/org/bukkit/craftbukkit/util/Commodore.java

@@ -196,6 +196,9 @@ public class Commodore
                                     case "values":
                                         super.visitMethodInsn( opcode, "org/bukkit/craftbukkit/util/CraftLegacy", "modern_" + name, desc, itf );
                                         return;
+                                    case "ordinal":
+                                        super.visitMethodInsn( Opcodes.INVOKESTATIC, "org/bukkit/craftbukkit/util/CraftLegacy", "modern_" + name, "(Lorg/bukkit/Material;)I", false );
+                                        return;
                                 }
                             }
 

src/main/java/org/bukkit/craftbukkit/util/CraftLegacy.java

@@ -221,6 +221,15 @@ public class CraftLegacy {
         return Arrays.copyOfRange(values, 0, Material.LEGACY_AIR.ordinal());
     }
 
+    public static int modern_ordinal(Material material) {
+        if (material.isLegacy()) {
+            // SPIGOT-4002: Fix for eclipse compiler manually compiling in default statements to lookupswitch
+            throw new NoSuchFieldError("Legacy field ordinal: " + material);
+        }
+
+        return material.ordinal();
+    }
+
     static {
         SPAWN_EGGS.put(EntityType.BAT, Material.BAT_SPAWN_EGG);
         SPAWN_EGGS.put(EntityType.BLAZE, Material.BLAZE_SPAWN_EGG);