fix

src/main/java/appeng/items/parts/ItemPart.java

@@ -140,6 +140,27 @@ public final class ItemPart extends AEBaseItem implements IPartItem, IItemGroup
         return AEApi.instance().partHelper().placeBus(player.getHeldItem(hand), pos, side, player, hand, w);
     }
 
+    @Override
+    public boolean isBookEnchantable(ItemStack itemstack1, ItemStack itemstack2) {
+        return true;
+    }
+
+    @Override
+    public boolean isEnchantable(ItemStack stack) {
+        if (getTypeByStack(stack) == PartType.IDENTITY_ANNIHILATION_PLANE) {
+            return true;
+        }
+        return super.isEnchantable(stack);
+    }
+
+    @Override
+    public int getItemEnchantability(ItemStack stack) {
+        if (getTypeByStack(stack) == PartType.IDENTITY_ANNIHILATION_PLANE) {
+            return 10;
+        }
+        return super.getItemEnchantability(stack);
+    }
+
     @Override
     @Nonnull
     public String getTranslationKey(final ItemStack is) {

src/main/java/appeng/parts/automation/PartAnnihilationPlane.java

@@ -330,6 +330,12 @@ public class PartAnnihilationPlane extends PartBasicState implements IGridTickab
         return changed;
     }
 
+    private void handleOverflow(final ItemStack stack, final IAEItemStack overflow) {
+        if (overflow.getStackSize() != 0L) {
+            stack.setCount((int) overflow.getStackSize());
+        }
+    }
+
     protected boolean isAnnihilationPlane(final TileEntity blockTileEntity, final AEPartLocation side) {
         if (blockTileEntity instanceof IPartHost) {
             final IPart p = ((IPartHost) blockTileEntity).getPart(side);
@@ -371,7 +377,7 @@ public class PartAnnihilationPlane extends PartBasicState implements IGridTickab
                     if (hasPower && canStore) {
                         if (modulate) {
                             energy.extractAEPower(requiredPower, Actionable.MODULATE, PowerMultiplier.CONFIG);
-                            this.breakBlockAndStoreItems(w, pos);
+                            this.breakBlockAndStoreItems(w, pos, items);
                             AppEng.proxy.sendToAllNearExcept(null, pos.getX(), pos.getY(), pos.getZ(), 64, w,
                                     new PacketTransitionEffect(pos.getX(), pos.getY(), pos.getZ(), this.getSide(), true));
                         } else {
@@ -471,14 +477,12 @@ public class PartAnnihilationPlane extends PartBasicState implements IGridTickab
         return canStore;
     }
 
-    private void breakBlockAndStoreItems(final WorldServer w, final BlockPos pos) {
-        w.destroyBlock(pos, true);
-
-        final AxisAlignedBB box = new AxisAlignedBB(pos).grow(0.2);
-        for (final Object ei : w.getEntitiesWithinAABB(EntityItem.class, box)) {
-            if (ei instanceof EntityItem) {
-                final EntityItem entityItem = (EntityItem) ei;
-                this.storeEntityItem(entityItem);
+    private void breakBlockAndStoreItems(final WorldServer w, final BlockPos pos, final List<ItemStack> drops) {
+        w.destroyBlock(pos, false);
+        for (final ItemStack drop : drops) {
+            IAEItemStack overflow = storeItemStack(drop);
+            if (overflow != null) {
+                handleOverflow(drop, overflow);
             }
         }
     }

src/main/java/appeng/parts/automation/PartIdentityAnnihilationPlane.java

@@ -19,23 +19,27 @@
 package appeng.parts.automation;
 
 
-import appeng.api.parts.IPart;
-import appeng.api.parts.IPartHost;
 import appeng.api.parts.IPartModel;
-import appeng.api.util.AEPartLocation;
 import appeng.items.parts.PartModels;
 import net.minecraft.block.state.IBlockState;
+import net.minecraft.enchantment.Enchantment;
+import net.minecraft.enchantment.EnchantmentHelper;
+import net.minecraft.init.Enchantments;
 import net.minecraft.init.Items;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
-import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.EnumHand;
+import net.minecraft.util.NonNullList;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.WorldServer;
 import net.minecraftforge.common.util.FakePlayer;
 import net.minecraftforge.common.util.FakePlayerFactory;
+import net.minecraftforge.event.ForgeEventFactory;
 
+import javax.annotation.Nonnull;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 
 public class PartIdentityAnnihilationPlane extends PartAnnihilationPlane {
@@ -47,26 +51,33 @@ public class PartIdentityAnnihilationPlane extends PartAnnihilationPlane {
         return MODELS.getModels();
     }
 
-    private static final float SILK_TOUCH_FACTOR = 16;
-
     public PartIdentityAnnihilationPlane(final ItemStack is) {
         super(is);
     }
 
-    @Override
-    protected boolean isAnnihilationPlane(final TileEntity blockTileEntity, final AEPartLocation side) {
-        if (blockTileEntity instanceof IPartHost) {
-            final IPart p = ((IPartHost) blockTileEntity).getPart(side);
-            return p != null && p.getClass() == this.getClass();
-        }
-        return false;
-    }
-
     @Override
     protected float calculateEnergyUsage(final WorldServer w, final BlockPos pos, final List<ItemStack> items) {
-        final float requiredEnergy = super.calculateEnergyUsage(w, pos, items);
+        float requiredEnergy = super.calculateEnergyUsage(w, pos, items);
 
-        return requiredEnergy * SILK_TOUCH_FACTOR;
+        final ItemStack stack = getItemStack();
+
+        // Give plane only a (100 / (level + 1))% chance to use energy.
+        // This is similar to vanilla Unbreaking behaviour for tools.
+        final int unbreaking = getEnchantmentLevel(Enchantments.UNBREAKING, stack);
+        if (unbreaking > 0) {
+            int randomNumber = w.rand.nextInt(unbreaking + 1);
+            if (randomNumber > 0) return 0;
+        }
+
+        // Increase power cost from other enchantments.
+        final int levelSum = EnchantmentHelper.getEnchantments(stack).values().stream().reduce(0, Integer::sum);
+        if (levelSum > 0) {
+            final int efficiency = getEnchantmentLevel(Enchantments.EFFICIENCY, stack);
+            requiredEnergy *= 8 * (levelSum - efficiency);
+            // Reduce total energy usage incurred by other enchantments by 15% per Efficiency level.
+            requiredEnergy *= (float) Math.pow(0.85F, efficiency);
+        }
+        return requiredEnergy;
     }
 
     @Override
@@ -74,7 +85,13 @@ public class PartIdentityAnnihilationPlane extends PartAnnihilationPlane {
         final FakePlayer fakePlayer = FakePlayerFactory.getMinecraft(w);
         final IBlockState state = w.getBlockState(pos);
 
-        if (state.getBlock().canSilkHarvest(w, pos, state, fakePlayer)) {
+        final ItemStack prevItem = fakePlayer.getHeldItem(EnumHand.MAIN_HAND);
+        final ItemStack stack = getItemStack();
+        fakePlayer.setHeldItem(EnumHand.MAIN_HAND, stack);
+
+        final int fortune = getEnchantmentLevel(Enchantments.FORTUNE, stack);
+
+        if (state.getBlock().canSilkHarvest(w, pos, state, fakePlayer) && fortune <= 0) {
             final List<ItemStack> out = new ArrayList<>(1);
             final Item item = Item.getItemFromBlock(state.getBlock());
 
@@ -85,16 +102,32 @@ public class PartIdentityAnnihilationPlane extends PartAnnihilationPlane {
                 }
                 final ItemStack itemstack = new ItemStack(item, 1, meta);
                 out.add(itemstack);
+
+                final float chance = ForgeEventFactory.fireBlockHarvesting(out, w, pos, state, 0, 1.0F, true, fakePlayer);
+                fakePlayer.setHeldItem(EnumHand.MAIN_HAND, prevItem);
+                if (chance == 1.0F) return out;
+                return out.stream().filter($ -> w.rand.nextFloat() <= chance).collect(Collectors.toList());
             }
+            fakePlayer.setHeldItem(EnumHand.MAIN_HAND, prevItem);
             return out;
-        } else {
-            return super.obtainBlockDrops(w, pos);
         }
+        final NonNullList<ItemStack> drops = NonNullList.create();
+        state.getBlock().getDrops(drops, w, pos, state, fortune);
+
+        final float chance = ForgeEventFactory.fireBlockHarvesting(drops, w, pos, state, fortune, 1.0F, false, fakePlayer);
+        fakePlayer.setHeldItem(EnumHand.MAIN_HAND, prevItem);
+        if (chance == 1.0F) return drops;
+        return drops.stream().filter($ -> w.rand.nextFloat() <= chance).collect(Collectors.toList());
     }
 
+    @Nonnull
     @Override
     public IPartModel getStaticModels() {
         return MODELS.getModel(this.getConnections(), this.isPowered(), this.isActive());
     }
 
+    private static int getEnchantmentLevel(final Enchantment enchantment, final ItemStack stack) {
+        if (enchantment == null) return 0;
+        return EnchantmentHelper.getEnchantmentLevel(enchantment, stack);
+    }
 }