--- /dev/null
+<?php
+/**
+ * Copyright 2011-2017 Anthon Pang. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @package WebDriver
+ *
+ * @author Anthon Pang <apang@softwaredevelopment.ca>
+ */
+
+namespace WebDriver;
+
+use WebDriver\Exception as WebDriverException;
+
+/**
+ * WebDriver\Storage class
+ *
+ * @package WebDriver
+ *
+ * @method mixed getKey($key) Get key/value pair.
+ * @method void deleteKey($key) Delete a specific key.
+ * @method integer size() Get the number of items in the storage.
+ */
+abstract class Storage extends AbstractWebDriver
+{
+ /**
+ * {@inheritdoc}
+ */
+ protected function methods()
+ {
+ return array(
+ 'key' => array('GET', 'DELETE'),
+ 'size' => array('GET'),
+ );
+ }
+
+ /**
+ * Get all keys from storage or a specific key/value pair
+ *
+ * @return mixed
+ */
+ public function get()
+ {
+ // get all keys
+ if (func_num_args() === 0) {
+ $result = $this->curl('GET', '');
+
+ return $result['value'];
+ }
+
+ // get key/value pair
+ if (func_num_args() === 1) {
+ return $this->getKey(func_get_arg(0));
+ }
+
+ throw WebDriverException::factory(WebDriverException::UNEXPECTED_PARAMETERS);
+ }
+
+ /**
+ * Set specific key/value pair
+ *
+ * @return \WebDriver\Storage
+ *
+ * @throw \WebDriver\Exception\UnexpectedParameters if unexpected parameters
+ */
+ public function set()
+ {
+ if (func_num_args() === 1
+ && is_array($arg = func_get_arg(0))
+ ) {
+ $this->curl('POST', '', $arg);
+
+ return $this;
+ }
+
+ if (func_num_args() === 2) {
+ $arg = array(
+ 'key' => func_get_arg(0),
+ 'value' => func_get_arg(1),
+ );
+ $this->curl('POST', '', $arg);
+
+ return $this;
+ }
+
+ throw WebDriverException::factory(WebDriverException::UNEXPECTED_PARAMETERS);
+ }
+
+ /**
+ * Delete storage or a specific key
+ *
+ * @return \WebDriver\Storage
+ *
+ * @throw \WebDriver\Exception\UnexpectedParameters if unexpected parameters
+ */
+ public function delete()
+ {
+ // delete storage
+ if (func_num_args() === 0) {
+ $this->curl('DELETE', '');
+
+ return $this;
+ }
+
+ // delete key from storage
+ if (func_num_args() === 1) {
+ return $this->deleteKey(func_get_arg(0));
+ }
+
+ throw WebDriverException::factory(WebDriverException::UNEXPECTED_PARAMETERS);
+ }
+
+ /**
+ * Factory method to create Storage objects
+ *
+ * @param string $type 'local' or 'session' storage
+ * @param string $url URL
+ *
+ * @return \WebDriver\Storage
+ */
+ public static function factory($type, $url)
+ {
+ // dynamically define custom storage classes
+ $className = ucfirst(strtolower($type));
+ $namespacedClassName = __CLASS__ . '\\' . $className;
+
+ if (!class_exists($namespacedClassName, false)) {
+ eval(
+ 'namespace ' . __CLASS__ . '; final class ' . $className . ' extends \\' . __CLASS__ . '{}'
+ );
+ }
+
+ return new $namespacedClassName($url);
+ }
+}