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<?php
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/**
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* @file
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* Class to manage footnotes.
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*
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* @copyright
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* (C) 2007-2012 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this module are subject to the Mozilla
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* Public License Version 1.1.
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* @see http://www.mozilla.org/MPL/MPL-1.1.html
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*/
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/**
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* Manages footnotes.
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*/
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class FootnoteManager {
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private static $fnstore = array();
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private static $nextFootnoteKey = 1;
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/**
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* Private constructor.
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*/
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private function __construct() {}
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/**
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* Get a list of footnotes.
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*
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* @param string $footnoteListKey
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* A string as key to the list of footnotes.
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*
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* @return array
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* An array of footnotes objects.
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*/
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public static function getFootnoteList($footnoteListKey) {
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return array_key_exists($footnoteListKey, self::$fnstore) ? self::$fnstore[$footnoteListKey] : NULL;
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}
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/**
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* Remove a list of footnotes.
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*
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* @param string $footnoteListKey
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* A string as key to the list of footnotes.
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*
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* @return void
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*/
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public static function removeFootnoteList($footnoteListKey) {
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if (array_key_exists($footnoteListKey, self::$fnstore)) {
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unset(self::$fnstore[$footnoteListKey]);
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}
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}
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/**
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* Render a footnote list
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*
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* @param array $footnoteListKey
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* @param string $separator
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*
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* @return string
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* The rendered footnotelist.
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*/
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public static function renderFootnoteList($footnoteListKey, $separator = ', ') {
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$out = '';
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if (array_key_exists($footnoteListKey, self::$fnstore)) {
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foreach (self::$fnstore[$footnoteListKey] as $fn) {
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$out .= $fn->doRender() . $separator;
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}
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$out = substr($out, 0, strlen($out) - strlen($separator));
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}
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return $out;
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}
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/**
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* Add a new footnote.
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*
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* @param $footnoteListKey
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* @param $object
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* @param $theme
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* @param $themeArguments
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*
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* @return unknown_type
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*/
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public static function addNewFootnote($footnoteListKey, $object = NULL, $theme = NULL, $themeArguments = array()) {
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if (!$object) {
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return FALSE;
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}
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if (!array_key_exists($footnoteListKey, self::$fnstore)) {
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self::$fnstore[$footnoteListKey] = array();
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}
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$fnKey = NULL;
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if (!($fnKey = self::footnoteExists($footnoteListKey, $object))) {
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$fnKey = self::$nextFootnoteKey++;
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$fn = new Footnote($fnKey, $object, $theme, $themeArguments);
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self::$fnstore[$footnoteListKey][$fnKey] = $fn;
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}
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return new FootnoteKey($fnKey, $footnoteListKey);
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}
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/**
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* Check if a footnote exists.
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*
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* @param $footnoteListKey
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* @param $object
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*
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* @return unknown_type
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*/
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private static function footnoteExists($footnoteListKey, $object) {
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foreach (self::$fnstore[$footnoteListKey] as $key => $fn) {
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/*
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When using the comparison operator (==), object variables are compared
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in a simple manner, namely:
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Two object instances are equal if they have the same attributes and
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values, and are instances of the same class.
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*/
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if ($object == $fn->object) {
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return $key;
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}
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}
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return FALSE;
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}
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/**
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* Stop users from cloning.
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*/
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public function __clone() {
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trigger_error('Cloning instances of the singleton class FootNoteManager is prohibited', E_USER_ERROR);
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}
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}
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