Slab Pattern Chests now also keep their inventory!

src/main/java/tconstruct/tools/blocks/CraftingSlab.java

@@ -7,8 +7,10 @@
 import net.minecraft.block.material.Material;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.entity.item.EntityItem;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.*;
+import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.*;
 import net.minecraft.world.World;
@@ -132,7 +134,22 @@ public void getSubBlocks (Item b, CreativeTabs tab, List list)
     @Override
     public void onBlockPlacedBy (World world, int x, int y, int z, EntityLivingBase entityliving, ItemStack stack)
     {
-        if (PHConstruct.freePatterns)
+        boolean keptInventory = false;
+        if (stack.hasTagCompound())
+        {
+            NBTTagCompound inventory = stack.getTagCompound().getCompoundTag("Inventory");
+            TileEntity te = world.getTileEntity(x, y, z);
+            if (inventory != null && te instanceof PatternChestLogic)
+            {
+                PatternChestLogic logic = (PatternChestLogic) te;
+                logic.readInventoryFromNBT(inventory);
+                logic.xCoord = x;
+                logic.yCoord = y;
+                logic.zCoord = z;
+                keptInventory = true;
+            }
+        }
+        if (!keptInventory && PHConstruct.freePatterns)
         {
             int meta = world.getBlockMetadata(x, y, z);
             if (meta == 4)
@@ -169,4 +186,52 @@ public TileEntity createNewTileEntity (World var1, int metadata)
             return null;
         }
     }
+
+    /* Keep pattern chest inventory */
+    @Override
+    public boolean removedByPlayer (World world, EntityPlayer player, int x, int y, int z, boolean willHarvest)
+    {
+        player.addExhaustion(0.025F);
+
+        if (!world.isRemote && world.getGameRules().getGameRuleBooleanValue("doTileDrops"))
+        {
+            int meta = world.getBlockMetadata(x, y, z);
+            if (meta == 4)
+            {
+                ItemStack chest = new ItemStack(this, 1, 4);
+                NBTTagCompound inventory = new NBTTagCompound();
+                PatternChestLogic logic = (PatternChestLogic) world.getTileEntity(x, y, z);
+                logic.writeInventoryToNBT(inventory);
+                NBTTagCompound baseTag = new NBTTagCompound();
+                baseTag.setTag("Inventory", inventory);
+                chest.setTagCompound(baseTag);
+
+                // remove content. This is necessary because otherwise the patterns would also spill into the world
+                // we don't want to prevent that since that's the intended behaviour for explosions.
+                for(int i = 0; i < logic.getSizeInventory(); i++)
+                    logic.setInventorySlotContents(i, null);
+
+                //Spawn item
+                if (!player.capabilities.isCreativeMode || player.isSneaking())
+                {
+                    float f = 0.7F;
+                    double d0 = (double) (world.rand.nextFloat() * f) + (double) (1.0F - f) * 0.5D;
+                    double d1 = (double) (world.rand.nextFloat() * f) + (double) (1.0F - f) * 0.5D;
+                    double d2 = (double) (world.rand.nextFloat() * f) + (double) (1.0F - f) * 0.5D;
+                    EntityItem entityitem = new EntityItem(world, (double) x + d0, (double) y + d1, (double) z + d2, chest);
+                    entityitem.delayBeforeCanPickup = 10;
+                    world.spawnEntityInWorld(entityitem);
+                }
+            }
+        }
+        return world.setBlockToAir(x, y, z);
+    }
+
+    @Override
+    public void harvestBlock (World world, EntityPlayer player, int x, int y, int z, int meta)
+    {
+        if (meta != 4)
+            super.harvestBlock(world, player, x, y, z, meta);
+        //Do nothing
+    }
 }