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vendor/fguillot/picofeed/lib/PicoFeed/Syndication/Writer.php

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+<?php
+
+namespace PicoFeed\Syndication;
+
+use RuntimeException;
+
+/**
+ * Base writer class.
+ *
+ * @author    Frederic Guillot
+ */
+abstract class Writer
+{
+    /**
+     * Dom object.
+     *
+     * @var \DomDocument
+     */
+    protected $dom;
+
+    /**
+     * Items.
+     *
+     * @var array
+     */
+    public $items = array();
+
+    /**
+     * Author.
+     *
+     * @var array
+     */
+    public $author = array();
+
+    /**
+     * Feed URL.
+     *
+     * @var string
+     */
+    public $feed_url = '';
+
+    /**
+     * Website URL.
+     *
+     * @var string
+     */
+    public $site_url = '';
+
+    /**
+     * Feed title.
+     *
+     * @var string
+     */
+    public $title = '';
+
+    /**
+     * Feed description.
+     *
+     * @var string
+     */
+    public $description = '';
+
+    /**
+     * Feed modification date (timestamp).
+     *
+     * @var int
+     */
+    public $updated = 0;
+
+    /**
+     * Generate the XML document.
+     *
+     * @abstract
+     *
+     * @param string $filename Optional filename
+     *
+     * @return string
+     */
+    abstract public function execute($filename = '');
+
+    /**
+     * Check required properties to generate the output.
+     *
+     * @param array $properties List of properties
+     * @param mixed $container  Object or array container
+     */
+    public function checkRequiredProperties(array $properties, $container)
+    {
+        foreach ($properties as $property) {
+            if ((is_object($container) && !isset($container->$property)) || (is_array($container) && !isset($container[$property]))) {
+                throw new RuntimeException('Required property missing: '.$property);
+            }
+        }
+    }
+}