SPIGOT-4889: Add PlayerTakeLecternBookEvent

By: Brokkonaut <hannos17@gmx.de>

paper-api/src/main/java/org/bukkit/event/player/PlayerTakeLecternBookEvent.java

@@ -0,0 +1,67 @@
+package org.bukkit.event.player;
+
+import org.bukkit.block.Lectern;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * This event is called when a player clicks the button to take a book of a
+ * Lectern. If this event is cancelled the book remains on the lectern.
+ */
+public class PlayerTakeLecternBookEvent extends PlayerEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    //
+    private boolean cancelled;
+    private final Lectern lectern;
+
+    public PlayerTakeLecternBookEvent(@NotNull Player who, @NotNull Lectern lectern) {
+        super(who);
+        this.lectern = lectern;
+    }
+
+    /**
+     * Gets the lectern involved.
+     *
+     * @return the Lectern
+     */
+    @NotNull
+    public Lectern getLectern() {
+        return lectern;
+    }
+
+    /**
+     * Gets the current ItemStack on the lectern.
+     *
+     * @return the ItemStack on the Lectern
+     */
+    @Nullable
+    public ItemStack getBook() {
+        return lectern.getInventory().getItem(0);
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}