Implemented Transactions

src/pocketmine/inventory/SimpleTransactionGroup.php

@@ -0,0 +1,109 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\inventory;
+
+use pocketmine\item\Item;
+
+/**
+ * This TransactionGroup only allows doing Transaction between one / two inventories
+ */
+class SimpleTransactionGroup implements TransactionGroup{
+	private $creationTime;
+	protected $hasExecuted = false;
+
+	/** @var Inventory[] */
+	protected $inventories = [];
+
+	/** @var Transaction[] */
+	protected $transactions = [];
+
+	public function __construct(){
+		$this->creationTime = microtime(true);
+	}
+
+	public function getCreationTime(){
+		return $this->creationTime;
+	}
+
+	public function getInventories(){
+		return $this->inventories;
+	}
+
+	public function getTransactions(){
+		return $this->transactions;
+	}
+
+	public function addTransaction(Transaction $transaction){
+		$this->transactions[spl_object_hash($transaction)] = $transaction;
+		$this->inventories[spl_object_hash($transaction->getInventory())] = $transaction->getInventory();
+	}
+
+	public function canExecute(){
+		/** @var Item[] $needItems */
+		$needItems = [];
+		/** @var Item[] $haveItems */
+		$haveItems = [];
+		foreach($this->transactions as $key => $ts){
+			$needItems[] = $ts->getTargetItem();
+			$checkSourceItem = $ts->getInventory()->getItem($ts->getSlot());
+			$sourceItem = $ts->getSourceItem();
+			if(!$checkSourceItem->equals($sourceItem, true) or $sourceItem->getCount() !== $checkSourceItem->getCount()){
+				return false;
+			}
+			$haveItems[] = $sourceItem;
+		}
+
+		foreach($needItems as $i => $needItem){
+			foreach($haveItems as $j => $haveItem){
+				if($needItem->equals($haveItem, true)){
+					$amount = min($needItem->getCount(), $haveItem->getCount());
+					$needItem->setCount($needItem->getCount() - $amount);
+					$haveItem->setCount($haveItem->getCount() - $amount);
+					if($haveItem->getCount() === 0){
+						unset($haveItems[$j]);
+					}
+					if($needItem->getCount() === 0){
+						unset($needItems[$i]);
+						break;
+					}
+				}
+			}
+		}
+
+		return count($haveItems) === 0 and count($needItems) === 0 and count($this->transactions) > 0;
+	}
+
+	public function execute(){
+		if($this->hasExecuted() or !$this->canExecute()){
+			return false;
+		}
+		foreach($this->transactions as $transaction){
+			$transaction->getInventory()->setItem($transaction->getSlot(), $transaction->getTargetItem());
+		}
+
+		return true;
+	}
+
+	public function hasExecuted(){
+		return $this->hasExecuted;
+	}
+}