register dispenser behaviors in DispenserBlock.getBehaviorForItem(...)

src/main/java/carpet/mixins/DispenserBlock_cactusMixin.java

@@ -0,0 +1,24 @@
+package carpet.mixins;
+
+import carpet.helpers.BlockRotator;
+import net.minecraft.block.DispenserBlock;
+import net.minecraft.block.dispenser.DispenserBehavior;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(DispenserBlock.class)
+public abstract class DispenserBlock_cactusMixin
+{
+    @Inject(method = "getBehaviorForItem", at = @At("HEAD"), cancellable = true)
+    private void registerCarpetBehaviors(ItemStack stack, CallbackInfoReturnable<DispenserBehavior> cir)
+    {
+        Item item = stack.getItem();
+        if (item == Items.CACTUS)
+            cir.setReturnValue(new BlockRotator.CactusDispenserBehaviour());
+    }
+}