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<?php
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class FootnoteManager
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{
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private static $fnstore = array();
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private static $nextFootnoteKey = 1;
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// private constructor
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private function __construct() {
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}
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/**
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* @param $footnoteListKey a string as key to the list of footnotes
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* @return an array of footnotes objects
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*
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*/
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public static function getFootnoteList($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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*
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* @param $footnoteListKey
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* @param $separator
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* @return unknown_type
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*/
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public static function renderFootnoteList($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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*
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* @param $footnoteListKey
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* @param $object
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* @param $theme
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* @param $themeArguments
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* @return unknown_type
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*/
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public static function addNewFootnote($footnoteListKey, $object, $theme = NULL, $themeArguments = array()){
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if(!array_key_exists($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 $fnKey;
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}
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/**
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*
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* @param $footnoteListKey
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* @param $object
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* @return unknown_type
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*/
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private static function footnoteExists($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 in a simple manner, namely:
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* Two object instances are equal if they have the same attributes and 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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// stop users from cloning
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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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