hide map for Character groups Quest Stations when there are no stations

www/analytics/core/Plugin/MetadataLoader.php

@@ -0,0 +1,106 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik\Plugin;
+
+use Exception;
+use Piwik\Common;
+use Piwik\Piwik;
+use Piwik\Version;
+
+/**
+ * @see core/Version.php
+ */
+require_once PIWIK_INCLUDE_PATH . '/core/Version.php';
+
+/**
+ * Loads plugin metadata found in the following files:
+ * - piwik.json
+ */
+class MetadataLoader
+{
+    const PLUGIN_JSON_FILENAME = 'plugin.json';
+
+    /**
+     * The name of the plugin whose metadata will be loaded.
+     *
+     * @var string
+     */
+    private $pluginName;
+
+    /**
+     * Constructor.
+     *
+     * @param string $pluginName Name of the plugin to load metadata.
+     */
+    public function __construct($pluginName)
+    {
+        $this->pluginName = $pluginName;
+    }
+
+    /**
+     * Loads plugin metadata. @see Plugin::getInformation.
+     *
+     * @return array
+     */
+    public function load()
+    {
+        return array_merge(
+            $this->getDefaultPluginInformation(),
+            $this->loadPluginInfoJson()
+        );
+    }
+
+    public function hasPluginJson()
+    {
+        $hasJson = $this->loadPluginInfoJson();
+
+        return !empty($hasJson);
+    }
+
+    private function getDefaultPluginInformation()
+    {
+        $descriptionKey = $this->pluginName . '_PluginDescription';
+        return array(
+            'description'      => Piwik::translate($descriptionKey),
+            'homepage'         => 'http://piwik.org/',
+            'authors'          => array(array('name' => 'Piwik', 'homepage'  => 'http://piwik.org/')),
+            'license'          => 'GPL v3+',
+            'license_homepage' => 'http://www.gnu.org/licenses/gpl.html',
+            'version'          => Version::VERSION,
+            'theme'            => false,
+            'require'          => array()
+        );
+    }
+
+    private function loadPluginInfoJson()
+    {
+        $path = \Piwik\Plugin\Manager::getPluginsDirectory() . $this->pluginName . '/' . self::PLUGIN_JSON_FILENAME;
+        return $this->loadJsonMetadata($path);
+    }
+
+    private function loadJsonMetadata($path)
+    {
+        if (!file_exists($path)) {
+            return array();
+        }
+
+        $json = file_get_contents($path);
+        if (!$json) {
+            return array();
+        }
+
+        $info = Common::json_decode($json, $assoc = true);
+        if (!is_array($info)
+            || empty($info)
+        ) {
+            throw new Exception("Invalid JSON file: $path");
+        }
+        return $info;
+    }
+}