My first commit of codes

vendor/league/flysystem/src/Plugin/PluggableTrait.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace League\Flysystem\Plugin;
+
+use League\Flysystem\FilesystemInterface;
+use League\Flysystem\PluginInterface;
+use LogicException;
+
+trait PluggableTrait
+{
+    /**
+     * @var array
+     */
+    protected $plugins = [];
+
+    /**
+     * Register a plugin.
+     *
+     * @param PluginInterface $plugin
+     *
+     * @return $this
+     */
+    public function addPlugin(PluginInterface $plugin)
+    {
+        $this->plugins[$plugin->getMethod()] = $plugin;
+
+        return $this;
+    }
+
+    /**
+     * Register a plugin.
+     *
+     * @param string $method
+     *
+     * @throws LogicException
+     *
+     * @return PluginInterface $plugin
+     */
+    protected function findPlugin($method)
+    {
+        if (! isset($this->plugins[$method])) {
+            throw new PluginNotFoundException('Plugin not found for method: '.$method);
+        }
+
+        if (! method_exists($this->plugins[$method], 'handle')) {
+            throw new LogicException(get_class($this->plugins[$method]).' does not have a handle method.');
+        }
+
+        return $this->plugins[$method];
+    }
+
+    /**
+     * Invoke a plugin by method name.
+     *
+     * @param string $method
+     * @param array  $arguments
+     *
+     * @return mixed
+     */
+    protected function invokePlugin($method, array $arguments, FilesystemInterface $filesystem)
+    {
+        $plugin = $this->findPlugin($method);
+        $plugin->setFilesystem($filesystem);
+        $callback = [$plugin, 'handle'];
+
+        return call_user_func_array($callback, $arguments);
+    }
+}