Add questions manager class

QuestionsFile.class.php

@@ -0,0 +1,71 @@
+<?php
+
+require("Question.class.php");
+
+class QuestionsFile
+{
+  private var $filename;
+  private var $treeXML;
+
+  public function __construct($filename)
+  {
+    $this->filename = $filename;
+    $this->reload();
+  }
+
+  /**
+   * Load or reload the questions file.
+   * Unsave changes will be erased.
+   */
+  private function reload()
+  {
+    $this->treeXML = new DOMDocument('1.0', 'UTF-8');
+    $this->treeXML->formatOutput   = true;
+
+    if (isfile($this->filename))
+    {
+      $this->treeXML->load($this->filename);
+
+      $root_nodes = $this->treeXML->getElementsByTagName("questions");
+      if ($root_node->length > 0)
+        $this->root_node = $root_nodes->item(0);
+      else
+        throw Exception("Not a valid nemubot QuestionsFile.");
+    }
+    else
+    {
+      $this->root_node = $this->treeXML->createElement("questions");
+      $this->treeXML->appendChild($this->root_node);
+    }
+  }
+
+  /**
+   * Add a new question into the file
+   * @param $question The question object
+   */
+  public function add_question($question)
+  {
+    $this->root_node->appendChild($question->to_xml($this->root_node));
+  }
+
+  /**
+   * Get a question from its unique identifiant
+   */
+  public function get_question($id)
+  {
+    return new Question($this->root_node->getElementById($id));
+  }
+
+  /**
+   * Write changes into the real file
+   */
+  public function save($newfilename = null)
+  {
+    if (!empty($newfilename))
+      $this->filename = $newfilename;
+
+    $this->treeXML->save($this->filename);
+  }
+}
+
+?>