Fixes some weird cases for lectern protection

src/main/java/com/massivecraft/factions/engine/EnginePermBuild.java

@@ -16,6 +16,7 @@ import com.massivecraft.massivecore.util.MUtil;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
+import org.bukkit.block.data.type.Lectern;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
@@ -154,12 +155,31 @@ public class EnginePermBuild extends Engine {
 
     @EventHandler(priority = EventPriority.NORMAL)
     public void takeBook(PlayerTakeLecternBookEvent event) {
-        protect(ProtectCase.TAKE_BOOK, true, event.getPlayer(), PS.valueOf(event.getLectern().getBlock()), Material.LECTERN, event);
+        protect(ProtectCase.CHANGE_BOOK, true, event.getPlayer(), PS.valueOf(event.getLectern().getBlock()),
+                Material.LECTERN, event);
     }
 
     @EventHandler(priority = EventPriority.NORMAL)
     public void build(BlockPlaceEvent event) {
-        build(event.getPlayer(), event.getBlock(), event);
+        if (isUpdatingBook(event)) {
+            protect(ProtectCase.CHANGE_BOOK, true, event.getPlayer(), PS.valueOf(event.getBlock()),
+                    Material.LECTERN, event);
+        } else {
+            build(event.getPlayer(), event.getBlock(), event);
+        }
+    }
+
+    /**
+     * Checks whether the given block place event is a book being updated
+     *
+     * @param event <p>The event to check</p>
+     * @return <p>True if the event is causing a book to be updated</p>
+     */
+    private boolean isUpdatingBook(BlockPlaceEvent event) {
+        return event.getBlockPlaced().getType().equals(Material.LECTERN) &&
+                event.getBlockPlaced().getState() instanceof Lectern &&
+                (event.getItemInHand().getType().equals(Material.WRITTEN_BOOK) ||
+                        event.getItemInHand().getType().equals(Material.WRITABLE_BOOK));
     }
 
     @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)

src/main/java/com/massivecraft/factions/engine/ProtectCase.java

@@ -17,7 +17,7 @@ public enum ProtectCase {
     USE_ITEM,
     USE_ENTITY,
 
-    TAKE_BOOK,
+    CHANGE_BOOK,
 
     // END OF LIST
     ;
@@ -29,7 +29,7 @@ public enum ProtectCase {
     public MPerm getPerm(Object object) {
         switch (this) {
             case BUILD:
-            case TAKE_BOOK:
+            case CHANGE_BOOK:
                 return MPerm.getPermBuild();
 
             case USE_ITEM: