Move account access check to an event

This should be the final addition that allows other plugins to implement
multi-owner/group shops like requested in #119 and #133 by listening to
all the transaction events to handle money flow and shop/account access
events to enable access to the actual shop.

src/main/java/com/Acrobot/ChestShop/Events/AccountAccessEvent.java

@@ -0,0 +1,57 @@
+package com.Acrobot.ChestShop.Events;
+
+import com.Acrobot.ChestShop.Database.Account;
+import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+
+/**
+ * Represents an access request for a specific account.
+ */
+public class AccountAccessEvent extends PlayerEvent {
+    private static final HandlerList handlers = new HandlerList();
+    private final Account account;
+    private boolean canAccess = false;
+
+    public AccountAccessEvent(Player player, Account account) {
+        super(player);
+        this.account = account;
+    }
+
+    /**
+     * The account to check the access for
+     *
+     * @return The account
+     */
+    public Account getAccount() {
+        return account;
+    }
+
+    /**
+     * Whether or not the player can access the account.
+     *
+     * @return Whether or not the player can access the account
+     */
+    public boolean canAccess() {
+        return canAccess;
+    }
+
+    /**
+     * Set whether or not the player can access the account.
+     *
+     * @param canAccess Whether or not the player can access the account
+     */
+    public void setAccess(boolean canAccess) {
+        this.canAccess = canAccess;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+}

src/main/java/com/Acrobot/ChestShop/UUIDs/NameManager.java

@@ -7,6 +7,7 @@ import com.Acrobot.ChestShop.ChestShop;
 import com.Acrobot.ChestShop.Configuration.Properties;
 import com.Acrobot.ChestShop.Database.Account;
 import com.Acrobot.ChestShop.Database.DaoCreator;
+import com.Acrobot.ChestShop.Events.AccountAccessEvent;
 import com.Acrobot.ChestShop.Events.AccountQueryEvent;
 import com.Acrobot.ChestShop.Permission;
 import com.Acrobot.ChestShop.Signs.ChestShopSign;
@@ -363,8 +364,22 @@ public class NameManager implements Listener {
         }
 
         Account account = getAccountFromShortName(name, false);
-        return account != null && (account.getUuid().equals(player.getUniqueId())
-                || (!account.getName().equalsIgnoreCase(name) && Permission.otherName(player, base, account.getName())));
+        if (account == null) {
+            return false;
+        }
+        if (!account.getName().equalsIgnoreCase(name) && Permission.otherName(player, base, account.getName())) {
+            return true;
+        }
+        AccountAccessEvent event = new AccountAccessEvent(player, account);
+        ChestShop.callEvent(event);
+        return event.canAccess();
+    }
+
+    @EventHandler
+    public static void onAccountAccessCheck(AccountAccessEvent event) {
+        if (!event.canAccess()) {
+            event.setAccess(event.getPlayer().getUniqueId().equals(event.getAccount().getUuid()));
+        }
     }
 
     public static boolean isAdminShop(UUID uuid) {