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<?php
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/**
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* @file
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* Singleton class to provide render hints.
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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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* A Singleton class which holds and manages information on the render path in the
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* page element hierarchy and also stored the current FootnoteListKey.
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*
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* RenderPath:
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* The render path is manages as a stack.
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* Usually you will push a new element to this stack at the beginning of a theme
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* method: RenderHints::pushToRenderStack('mypageElement');
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* After the output is generated you again pop the current path element from the stack:
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* RenderHints::popFromRenderStack()
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* The current render path can be retrieved by @see getRenderPath().
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*
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* FootnoteListKey
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*
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*/
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class RenderHints {
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private static $renderStack = array();
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private static $footnoteListKey = '';
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private static $footnoteListKeyDefault = 'PAGE_GLOBAL';
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private static $annotationsAndSourceConfig = ANNOTATIONS_AND_SOURCE_CONFIG_DEFAULT;
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/**
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* Private constructor.
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*/
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private function __construct() {}
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/**
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* @return string
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* The FootnoteListKey as set or the default FootnoteListKey ('PAGE_GLOBAL')
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*/
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public static function getFootnoteListKey() {
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if(self::$footnoteListKey){
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return self::$footnoteListKey;
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} else {
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return self::$footnoteListKeyDefault;
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}
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}
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/**
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* @return bool
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* true if the FootnoteListKey is unset or reset (== $footnoteListKeyDefault)
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*/
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public static function isUnsetFootnoteListKey() {
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return self::$footnoteListKey === self::$footnoteListKeyDefault;
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}
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/**
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* Set the new FootnoteList key.
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* The key which is replaced by the new value is returned.
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*
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* @param $key
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* The new FootnoteListKey to set
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* @return string
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* The last FootnoteListKey or NULL
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*/
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public static function setFootnoteListKey($key) {
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$lastFnListKey = self::$footnoteListKey;
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self::$footnoteListKey = $key;
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return $lastFnListKey;
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}
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/**
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* Reset the FootnoteListKey to the default value = 'PAGE_GLOBAL'
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* An existing key which is cleared will be returned returned.
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* @return string
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* The last FootnoteListKey or NULL
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*/
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public static function clearFootnoteListKey() {
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$lastFnListKey = self::$footnoteListKey;
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self::$footnoteListKey = self::$footnoteListKeyDefault;
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return $lastFnListKey;
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}
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/**
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* Put the $pathelement onto the stack render hint
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* path elements to add a new named hierarchy level
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* in which the following render actions are taking
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* place.
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*
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* @param string $pathelement
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* The element to put onto the stack of render elements.
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*/
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public static function pushToRenderStack($pathelement) {
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array_push(self::$renderStack, $pathelement);
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}
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/**
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* Removes and returns the last element from the
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* render stack.
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*
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* @return string
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* The element which has just been removed from the render stack.
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*/
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public static function popFromRenderStack() {
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return array_pop(self::$renderStack);
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}
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/**
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* @return array
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*/
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public static function getAnnotationsAndSourceConfig() {
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return self::$annotationsAndSourceConfig;
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}
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/**
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* Set the configuration for handling annotations and sources in the
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* current section of the page.
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*
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* This configuration is being used in handle_annotations_and_sources():
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*
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* @param array $annotationsAndSourceConfig
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* The associative configuration array with the keys and boolean values:
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* - 'sources_as_content' => TRUE|FALSE,
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* - 'link_to_name_used_in_source' => TRUE|FALSE,
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* - 'link_to_reference' => TRUE|FALSE,
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* - 'add_footnote_keys' => TRUE|FALSE,
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* - 'bibliography_aware' => TRUE|FALSE
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* @return array
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* the configuration array which has been set before.
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*/
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public static function setAnnotationsAndSourceConfig($annotationsAndSourceConfig) {
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$lastConfig = self::$annotationsAndSourceConfig;
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self::$annotationsAndSourceConfig = $annotationsAndSourceConfig;
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return $lastConfig;
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}
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/**
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* Provides access to the size of the render stack.
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*
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* @return int
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* The size of the render stack.
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*/
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public static function renderStackSize() {
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return sizeof(self::$renderStack);
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}
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/**
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* Composes and returns the render path from the
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* elements on the stack.
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* The render path elements will be concatenated with the
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* dot '.' character.
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*
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* @return string
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* The current render path.
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*/
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public static function getRenderPath() {
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return join('.', array_reverse(self::$renderStack));
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}
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/**
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* Function to produce html id attribute values consistently for
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* the current render path and the passed cdm entity.
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*
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* @param $cdmBase
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* The cdm entity.
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*
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* @return string
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* The value for the DOM element id attribute composed from the current
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* render path and cdm entity class and uuid.
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*
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* @see html_class_attribute_ref()
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*
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* TODO: check, only used in theme_cdm_polytomousKey_linkedStyle_subgraph()
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*
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*/
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public static function getHtmlElementID($cdmBase) {
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return 'id="' . RenderHints::getRenderPath() . '(' . $cdmBase->class . ':' . $cdmBase->uuid . ')"';
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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 RenderHints is prohibited', E_USER_ERROR);
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}
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}
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