Add OpenPlayerSaveEvent

Closes #156

api/src/main/java/com/lishid/openinv/event/OpenPlayerSaveEvent.java

@@ -0,0 +1,74 @@
+package com.lishid.openinv.event;
+
+import com.lishid.openinv.internal.ISpecialInventory;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Event fired before OpenInv saves a player's data.
+ */
+public class OpenPlayerSaveEvent extends Event implements Cancellable {
+
+  private static final HandlerList HANDLERS = new HandlerList();
+
+  private final Player player;
+  private final ISpecialInventory inventory;
+  private boolean cancelled = false;
+
+  public OpenPlayerSaveEvent(@NotNull Player player, @NotNull ISpecialInventory inventory) {
+    this.player = player;
+    this.inventory = inventory;
+  }
+
+  /**
+   * Get the {@link Player} whose data is being saved.
+   *
+   * @return player the Player whose data is being saved
+   */
+  public @NotNull Player getPlayer() {
+    return player;
+  }
+
+  /**
+   * Get the {@link ISpecialInventory} that triggered the save by being closed.
+   *
+   * @return the special inventory
+   */
+  public @NotNull ISpecialInventory getInventory() {
+    return inventory;
+  }
+
+  /**
+   * Get whether the event is cancelled.
+   *
+   * @return true if the event is cancelled
+   */
+  @Override
+  public boolean isCancelled() {
+    return cancelled;
+  }
+
+  /**
+   * Set whether the event is cancelled.
+   *
+   * @param cancel whether the event is cancelled
+   */
+  @Override
+  public void setCancelled(boolean cancel) {
+    this.cancelled = cancel;
+  }
+
+  @NotNull
+  @Override
+  public HandlerList getHandlers() {
+    return HANDLERS;
+  }
+
+  public static HandlerList getHandlerList() {
+    return HANDLERS;
+  }
+
+}