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757 lines
27 KiB
757 lines
27 KiB
<?php |
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|
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/** |
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* @file |
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* |
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* This file contains all admin and callback functions for solution pack |
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* management. |
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*/ |
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|
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/** |
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* Solution pack admin page callback. |
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*/ |
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function islandora_solution_packs_admin() { |
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module_load_include('inc', 'islandora', 'includes/utilities'); |
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drupal_add_css(drupal_get_path('module', 'islandora') . '/css/islandora.admin.css'); |
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if (!islandora_describe_repository()) { |
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$message = t('Could not connect to the repository. Please check the settings on the ' . |
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'<a href="@config_url" title="Islandora configuration page">Islandora configuration</a> page.', |
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array('@config_url' => url('admin/islandora/configure'))); |
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drupal_set_message($message, 'error'); |
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} |
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$enabled_solution_packs = module_invoke_all('islandora_required_objects'); |
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$output = ''; |
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foreach ($enabled_solution_packs as $solution_pack_module => $solution_pack_info) { |
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$objects = array(); |
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foreach ($solution_pack_info as $field => $value) { |
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switch ($field) { |
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case 'title': |
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$solution_pack_name = $value; |
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break; |
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case 'objects': |
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$objects = $value; |
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break; |
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} |
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} |
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$form_array = drupal_get_form('islandora_solution_pack_form_' . $solution_pack_module, $solution_pack_module, $solution_pack_name, $objects); |
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$output .= drupal_render($form_array); |
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} |
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return $output; |
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} |
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/** |
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* Solution pack admin page |
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*/ |
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function islandora_solution_pack_form($form, &$form_state, $solution_pack_module, $solution_pack_name, $objects = array()) { |
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global $base_url; |
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$needs_update = FALSE; |
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$needs_install = FALSE; |
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$could_not_connect = FALSE; |
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$form = array(); |
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|
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$form['solution_pack'] = array( |
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'#type' => 'fieldset', |
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'#collapsible' => FALSE, |
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'#collapsed' => FALSE, |
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'#attributes' => array('class' => array('islandora-solution-pack-fieldset')), |
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); |
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// adding values |
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$form['solution_pack']['solution_pack_module'] = array( |
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'#type' => 'value', |
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'#value' => $solution_pack_module, |
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); |
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$form['solution_pack']['solution_pack_name'] = array( |
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'#type' => 'value', |
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'#value' => $solution_pack_name, |
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); |
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$form['solution_pack']['objects'] = array( |
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'#type' => 'value', |
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'#value' => $objects, |
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); |
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$table_header = array(t('Label'), t('PID'), t('Status')); |
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$table_rows = array(); |
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|
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foreach ($objects as $object) { |
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$datastreams = NULL; |
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if (isset($object['pid'])) { |
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$pid = $object['pid']; |
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$table_row = array(); |
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$object_status = islandora_check_object_status($object); |
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switch ($object_status) { |
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case 'up_to_date': |
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$object_status = t('Up-to-date'); |
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break; |
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case 'missing': |
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$object_status = t('Missing'); |
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$needs_install = TRUE; |
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break; |
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case 'missing_datastream': |
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$object_status = t('Missing datastream'); |
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$needs_update = TRUE; |
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break; |
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case 'out_of_date': |
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$object_status = t('Out-of-date'); |
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$needs_update = TRUE; |
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break; |
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case 'could_not_connect': |
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$object_status = t('Could not connect'); |
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$could_not_connect = TRUE; |
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break; |
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} |
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if ($needs_install OR $could_not_connect) { |
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$label = $object['label'] ? $object['label'] : ''; |
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} |
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else { |
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$label = $object['label'] ? l($object['label'], $base_url . '/islandora/object/' . $pid) : ''; |
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} |
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$table_row[] = $label; |
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$table_row[] = $pid; |
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$table_row[] = $object_status; |
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$table_rows[] = $table_row; |
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} |
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} |
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|
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// title |
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if (!$form_state['submitted']) { |
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$form['solution_pack']['solution_pack_label'] = array( |
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'#markup' => filter_xss($solution_pack_name), |
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'#prefix' => '<h3>', |
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'#suffix' => '</h3>', |
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); |
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$form['solution_pack']['install_status'] = array( |
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'#markup' => '<strong>' . t('Object status:') . ' </strong>', |
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'#prefix' => '<div class="islandora-solution-pack-install-status">', |
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'#suffix' => '</div>', |
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); |
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if (!$needs_install AND !$needs_update AND !$could_not_connect) { |
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$form['solution_pack']['install_status']['#markup'] .= ' ' . theme('image', array('path' => 'misc/watchdog-ok.png')) . ' ' . t('All required objects are installed and up-to-date.'); |
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$submit_button_text = t("Force reinstall objects"); |
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} |
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elseif ($needs_install) { |
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$form['solution_pack']['install_status']['#markup'] .= ' ' . theme('image', array('path' => 'misc/watchdog-warning.png')) . ' ' . t('Some objects are missing and must be installed. See objects list for details.'); |
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$submit_button_text = t("Install objects"); |
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} |
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elseif ($needs_update) { |
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$form['solution_pack']['install_status']['#markup'] .= ' ' . theme('image', array('path' => 'misc/watchdog-warning.png')) . ' ' . t('Some objects must be reinstalled. See objects list for details.'); |
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$submit_button_text = t("Reinstall objects"); |
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} |
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elseif ($could_not_connect) { |
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$form['solution_pack']['install_status']['#markup'] .= ' ' . theme('image', array('path' => 'misc/watchdog-error.png')) . ' ' . t('Could not connect to the repository.'); |
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$submit_button_text = ''; |
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} |
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$form['solution_pack']['table'] = array( |
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'#type' => 'item', |
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'#markup' => theme('table', array('header' => $table_header, 'rows' => $table_rows)), |
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); |
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} |
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|
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if (!$could_not_connect) { |
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$form['solution_pack']['submit'] = array( |
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'#value' => $submit_button_text, |
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'#type' => 'submit', |
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'#name' => $solution_pack_module, |
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'#attributes' => array('class' => array('islandora-solution-pack-submit')), |
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'#weight' => 40, |
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); |
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$form['solution_pack']['#submit'] = array('islandora_solution_pack_form_submit'); |
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} |
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return $form; |
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} |
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/** |
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* Submit handler for solution pack form. |
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* |
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* @param array $form |
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* The form submitted. |
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* @param array_reference $form_state |
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* The state of the form submited. |
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*/ |
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function islandora_solution_pack_form_submit($form, &$form_state) { |
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$solution_pack_module = $form_state['values']['solution_pack_module']; |
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$solution_pack_name = $form_state['values']['solution_pack_name']; |
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$objects = $form_state['values']['objects']; |
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$batch = array( |
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'title' => t('Installing / updating solution pack objects'), |
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'file' => drupal_get_path('module', 'islandora') . '/includes/solution_packs.inc', |
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'operations' => array(), |
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); |
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foreach ($objects as $object) { |
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// Add this object to the batch job queue. |
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$batch['operations'][] = array('islandora_batch_reingest_object', array($object)); |
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} |
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batch_set($batch); |
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|
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// Hook to let solution pack objects be modified. |
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// Not using module_invoke so solution packs can be expanded by other modules. |
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module_invoke_all('islandora_postprocess_solution_pack', $solution_pack_module); |
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} |
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/** |
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* Batch reingest object(s) |
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* |
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* @param array $object |
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* @param type $context |
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* @return type |
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*/ |
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function islandora_batch_reingest_object($object_model, &$context) { |
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module_load_include('inc', 'islandora', 'includes/utilities'); |
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global $user; |
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global $base_url; |
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// new connection |
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try { |
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$connection = new IslandoraTuque($user); |
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} |
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catch (Exception $e) { |
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drupal_set_message(t('Unable to connect to the repository %e', array('%e' => $e)), 'error'); |
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return; |
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} |
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if (!empty($object_model) && is_array($object_model)) { |
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$pid = $object_model['pid']; |
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if (!islandora_is_valid_pid($pid)) { |
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return NULL; |
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} |
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// purge object |
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// check if object already exits |
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$object_query = $connection->api->a->findObjects('query', 'pid=' . $pid); |
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$reinstall = FALSE; |
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if (!empty($object_query['results'])) { |
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$object = islandora_get_object_by_id($pid); |
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if (isset($object)) { |
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islandora_delete_object($object); |
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} |
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$reinstall = TRUE; |
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} |
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|
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// build and ingest new object |
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try { |
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$object = islandora_solution_pack_add_object($object_model); |
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$object_name = $object->label; |
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if ($reinstall) { |
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drupal_set_message(t('Successfully reinstalled <em>@object_name</em>.', array('@object_name' => $object_name, '@pid' => $pid))); |
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} |
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else { |
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drupal_set_message(t('Successfully installed <em>@object_name</em>.', array('@object_name' => $object_name, '@pid' => $pid))); |
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} |
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} |
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catch (Exception $e) { |
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drupal_set_message(t('Installation of object @pid failed', array('@pid' => $pid)), 'error'); |
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} |
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} |
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} |
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/** |
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* Callback function that can be called from the solution pack's hook_install() and hook_uninstall() functions. |
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* |
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* @TODO: add documentation |
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*/ |
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function islandora_install_solution_pack($module_name = NULL, $op = 'install') { |
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// check if a module name is given. // @TODO: check module name for existance |
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if (!empty($module_name)) { |
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module_load_include('module', 'islandora', 'islandora'); |
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module_load_include('inc', 'islandora', 'includes/utilities'); |
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module_load_include('module', $module_name, $module_name); |
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|
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// set globals |
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global $base_url; |
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global $user; |
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|
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// set variables |
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$sp_admin = url($base_url . '/admin/islandora/solution_packs'); |
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$config_url = url('admin/islandora/configure'); |
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|
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// get module info |
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$info_file = drupal_get_path('module', $module_name) . '/' . $module_name . '.info'; |
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$info_array = drupal_parse_info_file($info_file); |
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$module_label = $info_array['name']; |
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|
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// check connection |
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$url = variable_get('islandora_base_url', 'http://localhost:8080/fedora'); |
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$info = islandora_describe_repository($url); |
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if (!$info) { |
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// operation |
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switch ($op) { |
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case 'install': |
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drupal_set_message(st('@module_label: Did not install any objects. Could not connect to the repository. Please check the settings on the <a href="@config_url" title="Islandora configuration page">Islandora configuration</a> page and install the required objects manually on the <a href="@sp_url" title="Solution pack admin">solution pack admin</a> page.', array('@module_label' => $module_label, '@config_url' => $config_url, '@sp_url' => $sp_admin)), 'error'); |
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break; |
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|
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case 'uninstall': |
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drupal_set_message(st('@module_label: Did not uninstall any objects. Could not connect to the repository. Please check the settings on the <a href="@config_url" title="Islandora configuration page">Islandora configuration</a> page and uninstall the required objects manually if necessary.', array('@module_label' => $module_label, '@config_url' => $config_url)), 'error'); |
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break; |
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} |
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return; |
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} |
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|
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// create new connection |
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try { |
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$connection = new IslandoraTuque($user); |
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} |
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catch (Exception $e) { |
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drupal_set_message(st('Unable to connect to the repository %e', array('%e' => $e)), 'error'); |
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return; |
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} |
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|
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// get object models |
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$enabled_solution_packs = module_invoke_all('islandora_required_objects'); |
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$islandora_required_objects = $module_name . '_islandora_required_objects'; |
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$required_objects = $islandora_required_objects(); |
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$objects = $required_objects[$module_name]['objects']; |
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|
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// loop over object models |
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foreach ($objects as $object) { |
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// set variables |
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$pid = $object['pid']; |
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$label = isset($object['label']) ? $object['label'] : st('Object'); |
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// check if object already exists |
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$query = $connection->api->a->findObjects('query', 'pid=' . $pid); |
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// object url |
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$object_url = url($base_url . '/islandora/object/' . $pid); |
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|
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// operation: install or uninstall |
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switch ($op) { |
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case 'install': |
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// if object exists, don't re-ingest |
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if (!empty($query['results'])) { |
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// check object status |
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$object_status = islandora_check_object_status($object); |
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// set messages |
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switch ($object_status) { |
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case 'up_to_date': |
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drupal_set_message(st('@module_label: did not install <a href="@object_url" title="@pid">@label</a>. The object already exists and is up-to-date.', array('@module_label' => $module_label, '@label' => $label, '@pid' => $pid, '@object_url' => $object_url))); |
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break; |
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case 'missing_datastream': |
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drupal_set_message(st('@module_label: did not install <a href="@object_url" title="@pid">@label</a>. The object already exists but is missing a datastream. Please reinstall the object on the <a href="@sp_admin" title="Solution pack admin page">solution pack admin page</a>.', array('@module_label' => $module_label, '@label' => $label, '@pid' => $pid, '@objecturl' => $object_url, '@sp_admin' => $sp_admin)), 'warning'); |
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break; |
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case 'out_of_date': |
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drupal_set_message(st('@module_label: did not install <a href="@object_url" title="@pid">@label</a>. The object already exists but is out-of-date. Please update the object on the <a href="@sp_admin" title="Solution pack admin page">solution pack admin page</a>.', array('@module_label' => $module_label, '@label' => $label, '@pid' => $pid, '@object_url' => $object_url, '@sp_admin' => $sp_admin)), 'warning'); |
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break; |
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} |
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} |
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else { |
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islandora_solution_pack_add_object($object); |
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drupal_set_message(st('@module_label: installed <a href="@object_url" title="@pid">@label</a> object.', array('@module_label' => $module_label, '@label' => $label, '@pid' => $pid, '@object_url' => $object_url))); |
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} |
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break; |
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|
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case 'uninstall': |
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// if object exists, set message |
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if (!empty($query['results'])) { |
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$object_url = url($base_url . '/islandora/object/' . $pid); |
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drupal_set_message(st('@module_label: did not remove <a href="@object_url" title="@pid">@label</a>. It may be used by other sites.', array('@pid' => $pid, '@object_url' => $object_url, '@label' => $label, '@module_label' => $module_label)), 'warning'); |
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} |
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break; |
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} |
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} |
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} |
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} |
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/** |
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* Function to check the status of an object against an object model array. |
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* |
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* @param array $object_model |
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* an array describing an object |
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* @return string |
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* Returns one of the following values: |
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* up_to_date, missing, missing_datastream or out_of_date |
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* You can perform an appropriate action based on this value. |
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* Returns FALSE if the array is empty |
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* |
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* @see islandora_solution_pack_form() |
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* @see islandora_install_solution_pack() |
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* @todo: Should this function live in islandora.module so it can be called |
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* easier without having to include the solution_packs.inc file? |
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*/ |
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function islandora_check_object_status($object_model = array()) { |
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if (!empty($object_model)) { |
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// set variables |
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$pid = $object_model['pid']; |
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$object_status = 'up_to_date'; |
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|
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// table row |
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$table_row = array(); |
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|
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// check connection |
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module_load_include('inc', 'islandora', 'includes/utilities'); |
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$url = variable_get('islandora_base_url', 'http://localhost:8080/fedora'); |
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$info = islandora_describe_repository($url); |
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if (!$info) { |
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$object_status = 'could_not_connect'; |
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} |
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else { |
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|
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// load object |
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$object = islandora_object_load($pid); |
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// check if object exists |
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if (!$object) { |
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$object_status = 'missing'; |
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} |
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else { |
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// object defined with single datastream file |
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// @TODO: should dsversion be mandatory for the check to valid? |
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if (isset($object_model['dsid']) && isset($object_model['datastream_file']) && isset($object_model['dsversion'])) { |
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$datastreams = array( |
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array( |
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'dsid' => $object_model['dsid'], |
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'datastream_file' => $object_model['datastream_file'], |
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'dsversion' => $object_model['dsversion'], |
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), |
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); |
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} |
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// object defined with multiple datastreams (using an array) |
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elseif (!empty($object_model['datastreams'])) { |
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$datastreams = $object_model['datastreams']; |
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} |
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if (!empty($datastreams) && is_array($datastreams)) { |
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// loop over defined datastreams |
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foreach ($datastreams as $ds) { |
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$ds_id = $ds['dsid']; |
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// check if defined datastream exists in the object |
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if (!$object[$ds_id]) { |
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$object_status = 'missing_datastream'; |
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break; |
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} |
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elseif (isset($ds['dsversion'])) { |
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// Check if the datastream is versioned and needs updating. |
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$installed_version = islandora_get_islandora_datastream_version($object, $ds['dsid']); |
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$available_version = islandora_get_islandora_datastream_version(NULL, NULL, $ds['datastream_file']); |
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|
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if ($available_version > $installed_version) { |
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$object_status = 'out_of_date'; |
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break; |
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} |
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} |
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} |
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} |
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} |
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} |
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return $object_status; |
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} |
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else { |
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return FALSE; |
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} |
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} |
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|
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/** |
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* Converts the given definition into an object and add's it to the repository. |
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* |
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* @param array $object_definition |
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* An associative array containing the necessary parameters to create the |
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* desired object: |
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* - pid: The PID with which the object will be created. |
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* - label: An optional label to apply to the object. |
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* - datastreams: Same as the "datastreams" array accepted by |
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* islandora_prepare_new_object(). |
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* - cmodel: Either an array of content models as accepted by |
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* islandora_preprare_new_object(), or a single content model PID to add |
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* to the object. |
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* - parent: Either an array of parents, or a single parent PID to which to |
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* relate to; uses isMemberOfCollection by default. |
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* - relationships: An array of relationships as accepted by |
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* islandora_prepare_new_object(). |
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* |
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* @return FedoraObject |
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* The newly created object. |
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*/ |
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function islandora_solution_pack_add_object(array $object_definition) { |
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$object = islandora_solution_pack_prepare_new_object($object_definition); |
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return islandora_add_object($object); |
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} |
|
|
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/** |
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* Prepares a new object based on the solution pack style of declaring them as arrays. |
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* |
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* @param array $object_definition |
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* An associative array containing the necessary parameters to create the |
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* desired object: |
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* - pid: The PID with which the object will be created. |
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* - label: An optional label to apply to the object. |
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* - datastreams: Same as the "datastreams" array accepted by |
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* islandora_prepare_new_object(). |
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* - cmodel: Either an array of content models as accepted by |
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* islandora_prepare_new_object(), or a single content model PID to add |
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* to the object. |
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* - parent: Either an array of parents, or a single parent PID to which to |
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* relate to; uses isMemberOfCollection by default. |
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* - relationships: An array of relationships as accepted by |
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* islandora_prepare_new_object(). |
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* |
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* @return NewFedoraObject |
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* An NewFedoraObject which has been initalized with the given properties. |
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*/ |
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function islandora_solution_pack_prepare_new_object(array $object_definition) { |
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$namespace = $object_definition['pid']; |
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$label = !empty($object_definition['label']) ? $object_definition['label'] : NULL; |
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$datastreams = array(); |
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if (!empty($object_definition['datastreams']) AND is_array($object_definition['datastreams'])) { |
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$datastreams = $object_definition['datastreams']; |
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} |
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$content_models = array(); |
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if (!empty($object_definition['cmodel'])) { |
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if (is_array($object_definition['cmodel'])) { |
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$content_models = $object_definition['cmodel']; |
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} |
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else { |
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$content_models[] = $object_definition['cmodel']; |
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} |
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} |
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$relationships = array(); |
|
if (!empty($object_definition['parent']) AND !is_array($object_definition['parent'])) { |
|
$relationships[] = array('relationship' => 'isMemberOfCollection', 'pid' => $object_definition['parent']); |
|
} |
|
if (!empty($object_definition['parents']) AND is_array($object_definition['parents'])) { |
|
foreach ($object_definition['parents'] as $parent) { |
|
$relationships[] = array('relationship' => 'isMemberOfCollection', 'pid' => $parent); |
|
} |
|
} |
|
if (!empty($object_definition['relationships']) AND is_array($object_definition['relationships'])) { |
|
foreach ($object_definition['relationships'] as $relationship) { |
|
$relationships[] = array('relationship' => $relationship['relationship'], 'pid' => $relationship['pid']); |
|
} |
|
} |
|
return islandora_prepare_new_object($namespace, $label, $datastreams, $content_models, $relationships); |
|
} |
|
|
|
|
|
/** |
|
* @defgroup viewer-functions |
|
* @{ |
|
* Helper functions to include viewers for solution packs. |
|
*/ |
|
|
|
/** |
|
* A form construct to create a viewer selection table. |
|
* |
|
* @param string $variable_id |
|
* The ID of the Drupal variable to save the viewer settings in |
|
* @param string $mimetype |
|
* The table will be populated with viewers supporting this mimetype |
|
* @return |
|
* A form api array which defines a themed table to select a viewer. |
|
*/ |
|
function islandora_viewers_form($variable_id = NULL, $mimetype = NULL) { |
|
$form = array(); |
|
// get viewers |
|
$viewers = islandora_get_viewers($mimetype); |
|
if (!empty($viewers)) { |
|
// add option for no viewer |
|
$no_viewer = array(); |
|
$no_viewer['none'] = array( |
|
'label' => t('None'), |
|
'description' => t('Don\'t use a viewer for this solution pack.'), |
|
); |
|
// merge to viewers array |
|
$viewers = array_merge_recursive($no_viewer, $viewers); |
|
} |
|
// get viewer settings |
|
$viewers_config = variable_get($variable_id, array()); |
|
// viewer |
|
$form['viewers'] = array( |
|
'#type' => 'fieldset', |
|
'#title' => t('Viewers'), |
|
'#collapsible' => FALSE, |
|
'#collapsed' => FALSE, |
|
); |
|
|
|
if (!empty($viewers)) { |
|
// viewers table |
|
$form['viewers'][$variable_id] = array( |
|
'#type' => 'item', |
|
'#title' => t('Select a viewer'), |
|
'#description' => t('Preferred viewer for your solution pack. These may be provided by third-party modules.'), |
|
// This attribute is important to return the submitted values in a deeper |
|
// nested arrays in |
|
'#tree' => TRUE, |
|
'#theme' => 'islandora_viewers_table', |
|
); |
|
|
|
// table loop |
|
foreach ($viewers as $name => $profile) { |
|
|
|
$options[$name] = ''; |
|
// machine name |
|
$form['viewers'][$variable_id]['name'][$name] = array( |
|
'#type' => 'hidden', |
|
'#value' => $name, |
|
); |
|
// label |
|
$form['viewers'][$variable_id]['label'][$name] = array( |
|
'#type' => 'item', |
|
'#markup' => $profile['label'], |
|
); |
|
// description |
|
$form['viewers'][$variable_id]['description'][$name] = array( |
|
'#type' => 'item', |
|
'#markup' => $profile['description'], |
|
); |
|
// configuration url |
|
$form['viewers'][$variable_id]['configuration'][$name] = array( |
|
'#type' => 'item', |
|
'#markup' => (isset($profile['configuration']) AND $profile['configuration'] != '') ? l(t('configure'), $profile['configuration']) : '', |
|
); |
|
} |
|
// radios |
|
$form['viewers'][$variable_id]['default'] = array( |
|
'#type' => 'radios', |
|
'#options' => isset($options) ? $options : array(), |
|
'#default_value' => !empty($viewers_config) ? $viewers_config['default'] : 'none', |
|
); |
|
} |
|
else { |
|
// No viewers found |
|
$form['viewers'][$variable_id . '_no_viewers'] = array( |
|
'#markup' => t('No viewers detected.'), |
|
); |
|
// remove viewers variable |
|
variable_del($variable_id); |
|
} |
|
return $form; |
|
} |
|
|
|
/** |
|
* Returns all defined viewers. |
|
* |
|
* @param string $mimetype |
|
* specify a mimetype to return only viewers that support this certain |
|
* mimetype. |
|
* @return |
|
* array of viewer definitions, or FALSE if none are found. |
|
*/ |
|
function islandora_get_viewers($mimetype = NULL) { |
|
$viewers = array(); |
|
// get all viewers |
|
$defined_viewers = module_invoke_all('islandora_viewer_info'); |
|
// filter viewers by mimetype |
|
foreach ($defined_viewers as $key => $value) { |
|
if (in_array($mimetype, $value['mimetype']) OR $mimetype == NULL) { |
|
$viewers[$key] = $value; |
|
} |
|
} |
|
if (!empty($viewers)) { |
|
return $viewers; |
|
} |
|
return FALSE; |
|
} |
|
|
|
/** |
|
* Theme function for the admin primary display table |
|
* |
|
* @param type $variables |
|
* render element: $form |
|
* Contains the form array |
|
* @return |
|
* rendered form element |
|
* |
|
* @see islandora_large_image_admin() |
|
*/ |
|
function theme_islandora_viewers_table($variables) { |
|
// set form |
|
$form = $variables['form']; |
|
$rows = array(); |
|
|
|
foreach ($form['name'] as $key => $element) { |
|
// Do not take form control structures. |
|
if (is_array($element) && element_child($key)) { |
|
// set rows |
|
$row = array(); |
|
$row[] = array('data' => drupal_render($form['default'][$key])); |
|
$row[] = array('data' => drupal_render($form['label'][$key])); |
|
$row[] = array('data' => drupal_render($form['description'][$key])); |
|
$row[] = array('data' => drupal_render($form['configuration'][$key])); |
|
|
|
// add to rows |
|
$rows[] = array('data' => $row); |
|
} |
|
} |
|
|
|
// Individual table headers. |
|
// default | label | description | configuration |
|
$header = array(); |
|
$header[] = array('data' => t('Default')); |
|
$header[] = array('data' => t('Label')); |
|
$header[] = array('data' => t('Description')); |
|
$header[] = array('data' => t('Configuration')); |
|
|
|
// render form |
|
$output = ''; |
|
$output .= theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => array('id' => 'islandora-viewers-table'))); |
|
$output .= drupal_render_children($form); |
|
|
|
return $output; |
|
} |
|
|
|
/** |
|
* Gather information and return a rendered viewer |
|
* |
|
* @param array/string $params |
|
* Array or string with data the module needs in order to render a full viewer |
|
* @param string $variable_id |
|
* The id of the Drupal variable the viewer settings are saved in |
|
* @return |
|
* The callback to the viewer module. Returns a rendered viewer. Returns FALSE |
|
* if no viewer is set. |
|
*/ |
|
function islandora_get_viewer($params = NULL, $variable_id = NULL) { |
|
// get viewer from settings |
|
$settings = variable_get($variable_id, array()); |
|
// make sure a viewer is set |
|
if (!empty($settings) AND $settings['default'] !== 'none') { |
|
// get callback function |
|
$viewer_id = islandora_get_viewer_id($variable_id); |
|
if ($viewer_id AND $params !== NULL) { |
|
$callback = islandora_get_viewer_callback($viewer_id); |
|
// call callback function |
|
return $callback($params); |
|
} |
|
} |
|
return NULL; |
|
} |
|
|
|
/** |
|
* Get id of the enabled viewer. |
|
* |
|
* @param string $variable_id |
|
* The id of the Drupal variable the viewer settings are saved in |
|
* @return |
|
* The enabled viewer id. Returns FALSE if no viewer config is set. |
|
*/ |
|
function islandora_get_viewer_id($variable_id) { |
|
$viewers_config = variable_get($variable_id, array()); |
|
if (!empty($viewers_config)) { |
|
return $viewers_config['default']; |
|
} |
|
return FALSE; |
|
} |
|
|
|
/** |
|
* Get callback function for a viewer. |
|
* |
|
* @param string $viewer_id |
|
* The ID of a viewer |
|
* @return |
|
* The callback function as a string as defined by the viewer. |
|
*/ |
|
function islandora_get_viewer_callback($viewer_id = NULL) { |
|
if ($viewer_id !== NULL) { |
|
$viewers = module_invoke_all('islandora_viewer_info'); |
|
if (isset($viewers[$viewer_id]['callback'])) { |
|
return $viewers[$viewer_id]['callback']; |
|
} |
|
} |
|
return FALSE; |
|
} |
|
|
|
/** |
|
* @} End of "defgroup viewer-functions". |
|
*/
|
|
|