Implement Dropper interface. Adds BUKKIT-3750

src/main/java/org/bukkit/craftbukkit/block/CraftDropper.java

@@ -0,0 +1,50 @@
+package org.bukkit.craftbukkit.block;
+
+import net.minecraft.server.BlockDropper;
+import net.minecraft.server.TileEntityDropper;
+
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.Dropper;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.inventory.CraftInventory;
+import org.bukkit.inventory.Inventory;
+
+public class CraftDropper extends CraftBlockState implements Dropper {
+    private final CraftWorld world;
+    private final TileEntityDropper dropper;
+
+    public CraftDropper(final Block block) {
+        super(block);
+
+        world = (CraftWorld) block.getWorld();
+        dropper = (TileEntityDropper) world.getTileEntityAt(getX(), getY(), getZ());
+    }
+
+    public Inventory getInventory() {
+        return new CraftInventory(dropper);
+    }
+
+    public void drop() {
+        Block block = getBlock();
+
+        synchronized (block) {
+            if (block.getType() == Material.DROPPER) {
+                BlockDropper drop = (BlockDropper) net.minecraft.server.Block.DROPPER;
+
+                drop.dispense(world.getHandle(), getX(), getY(), getZ());
+            }
+        }
+    }
+
+    @Override
+    public boolean update(boolean force) {
+        boolean result = super.update(force);
+
+        if (result) {
+            dropper.update();
+        }
+
+        return result;
+    }
+}