initial commit

src/Internal/DependencyManagement/Definition.php

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+<?php
+/**
+ * An extension to the Definition class to prevent constructor injection from being possible.
+ */
+
+namespace Automattic\WooCommerce\Internal\DependencyManagement;
+
+use Automattic\WooCommerce\Vendor\League\Container\Definition\Definition as BaseDefinition;
+
+/**
+ * An extension of the definition class that replaces constructor injection with method injection.
+ */
+class Definition extends BaseDefinition {
+
+	/**
+	 * The standard method that we use for dependency injection.
+	 */
+	const INJECTION_METHOD = 'init';
+
+	/**
+	 * Resolve a class using method injection instead of constructor injection.
+	 *
+	 * @param string $concrete The concrete to instantiate.
+	 *
+	 * @return object
+	 */
+	protected function resolveClass( string $concrete ) {
+		$resolved = $this->resolveArguments( $this->arguments );
+		$concrete = new $concrete();
+
+		// Constructor injection causes backwards compatibility problems
+		// so we will rely on method injection via an internal method.
+		if ( method_exists( $concrete, static::INJECTION_METHOD ) ) {
+			call_user_func_array( array( $concrete, static::INJECTION_METHOD ), $resolved );
+		}
+
+		return $concrete;
+	}
+}