Merge pull request #193 from adam-vessey/7.x-alter-hook-defs

Alter hook calls and update documentation to reflect it.

includes/islandora.ingest.inc

@@ -2,7 +2,7 @@
 
 /**
  * @file
- * This file contains ingest callback functions
+ * This file contains ingest callback functions.
  */
 
 /**
@@ -16,23 +16,69 @@ function islandora_ingest_get_information(AbstractFedoraObject $collection_objec
 }
 
 /**
- * @TODO: needs documentation
+ * Get an ingestable object.
+ * 
+ * @deprecated
+ *   Deprecated in favour of the more flexible
+ *   islandora_ingest_new_object_prepare()--which this function has been made
+ *   to call behind the scenes anyway.
+ *
+ * @param array $content_models
+ *   An array of content models to which the new object should subscribe, where
+ *   each content model is described by an associative array containing:
+ *   - pid: The Fedora PID of the content model.
+ * @param string $collection_pid
+ *   The collection to which the new object should belong.
+ * @param string $relationship
+ *   The relationship this object will have to the collection.
+ * @param string $namespace
+ *   The namespace in which the PID for the new object will be created.
+ *
+ * @return NewFedoraObject
+ *   A NewFedoraObject which may be adjusted before ingesting.
  */
 function islandora_ingest_get_object($content_models, $collection_pid, $relationship, $namespace) {
-  module_load_include('inc', 'islandora', 'includes/tuque');
+  $models = array();
-  global $user;
+  foreach ($content_models as $relation) {
-  $connection = new IslandoraTuque($user);
+    $models[] = $relation['pid'];
-  $object = $connection->repository->constructObject($namespace);
-  foreach ($content_models as $content_model) {
-    $object->relationships->add(FEDORA_MODEL_URI, 'hasModel', $content_model['pid']);
   }
-  $object->relationships->add(FEDORA_RELS_EXT_URI, $relationship, $collection_pid);
+
-  module_invoke_all('islandora_ingest_pre_ingest', $object, $content_models, $collection_pid);
+  return islandora_ingest_new_object_prepare($namespace, NULL, array(), $models, array(
-  return $object;
+    array(
+      'pid' => $collection_pid,
+      'relationship' => $relationship,
+    ),
+  ), $collection_pid);
 }
 
 /**
- * @TODO: needs documentation
+ * Prepare an ingestable object.
+ *
+ * @param string $namespace
+ *   The namespace in which the PID for the new object will be created.
+ * @param string $label
+ *   An optional label to apply to the object.
+ * @param array $datastreams
+ *   A array of datastreams to add, where each datastream definition is an
+ *   associative array containing:
+ *   - dsid: The datastream ID.
+ *   - label: An optional label for the datastream.
+ *   - mimetype: A MIMEtype for the datastream; defaults to text/xml.
+ *   - control_group: One of X, M, R and E; defaults to M.
+ *   - datastream_file: A web-accessible path, for which we try to get an
+ *     absolute path using url().
+ * @param array $content_models
+ *   An array of content model PIDs to which the new object should subscribe.
+ * @param array $relationships
+ *   An array of relationships, where each relationship is an associative array
+ *   containing:
+ *   - relationship: The predicate for the relationship, from the Fedora
+ *     RELS-EXT namespace.
+ *   - pid: The object for the relationship, to which we are creating the
+ *     relationhsip.
+ *
+ * @return NewFedoraObject
+ *   An ingestable NewFedoraObject.
  */
 function islandora_ingest_new_object_prepare($namespace = NULL, $label = NULL, $datastreams = array(), $content_models = array(), $relationships = array(), $collection_pid = NULL) {
   // include Tuque library
@@ -86,20 +132,56 @@ function islandora_ingest_new_object_prepare($namespace = NULL, $label = NULL, $
     $object->ingestDatastream($datastream);
   }
 
-  module_invoke_all('islandora_ingest_pre_ingest', $object, $content_models, $collection_pid);
+  module_load_include('inc', 'islandora', 'includes/utilities');
+  foreach (islandora_build_hook_list('islandora_ingest_pre_ingest', $content_models) as $hook) {
+    module_invoke_all($hook, $object, $content_models, $collection_pid);
+  }
+
   return $object;
 }
 
 /**
- * @TODO: needs documentation
+ * Ingest the given object into Fedora.
+ *
+ * @param NewFedoraObject $object
+ *   An ingestable FedoraObject.
+ *
+ * @return FedoraObject
+ *   The ingested FedoraObject, after running the post ingest hooks.
  */
 function islandora_ingest_add_object(&$object) {
   $object->repository->ingestObject($object);
-  module_invoke_all('islandora_ingest_post_ingest', $object);
+
-  return $object;
+  module_load_include('inc', 'islandora', 'includes/utilities');
+
+  foreach (islandora_build_hook_list(ISLANDORA_POST_INGEST_HOOK, $object->models) as $hook) {
+    module_invoke_all($hook, $object);
   }
 
+  return $object;
+}
 
+/**
+ * Ingest an object.
+ *
+ * @param array $object_model
+ *   An associative array containing the necessary parameters to create the
+ *   desired object:
+ *   - pid: The PID with which the object will be created.
+ *   - label: An optional label to apply to the object.
+ *   - datastreams: Same as the "datastreams" array accepted by
+ *     islandora_ingest_new_object_prepare().
+ *   - cmodel: Either an array of content models as accepted by
+ *     islandora_ingest_new_object_prepare(), or a single content model PID to add
+ *     to the object.
+ *   - parent: Either an array of parents, or a single parent PID to which to
+ *     relate to; uses isMemberOfCollection by default.
+ *   - relationships: An array of relationships as accepted by
+ *     islandora_ingest_new_object_prepare().
+ *
+ * @return FedoraObject
+ *   An FedoraObject which has been ingested into Fedora.
+ */
 function islandora_ingest_new_object($object_model) {
   // prepare variables
   // namespace

includes/utilities.inc

@@ -8,6 +8,8 @@
 /**
  * Convert bytes to human readable format
  *
+ * XXX: Shouldn't Drupal's format_size() be preferred?
+ *
  * @param integer bytes Size in bytes to convert
  * @return string
  */
@@ -104,3 +106,49 @@ function islandora_describe_repository($url) {
     return FALSE;
   }
 }
+
+/**
+ * Build a list of all the hooks to call.
+ *
+ * Concatenates the each pid (escaped) to the hook name, for calling in
+ * module_invoke_all().
+ *
+ * @param string $hook
+ *   A hook to call.
+ * @param array $pids
+ *   An array of PIDs (probably content models).
+ *
+ * @return array
+ *   An array with each PID escaped and concatenated with the base hook name,
+ *   in addition to the base hook name at the end.
+ */
+function islandora_build_hook_list($hook, $pids = array()) {
+  $hooks = array();
+
+  foreach ($pids as $model) {
+    $hooks[] = islandora_escape_pid_for_function($model) . '_' . $hook;
+  }
+  $hooks[] = $hook;
+
+  return $hooks;
+}
+
+/**
+ * Escape a Fedora PID to be valid inside of a PHP function name.
+ *
+ * Originally intended to allow inclusion of a PID in a module_invoke_all()
+ * call.
+ */
+function islandora_escape_pid_for_function($pid) {
+  // Apparently, case doesn't matter for function calls in PHP, so let's not
+  //   really worry about changing the case.
+  return str_replace(
+    // Any PID characters which are not valid in the name of a PHP function.
+    array(
+      ':',
+      '-',
+    ),
+    '_',
+    $pid
+  );
+}

islandora.api.php

@@ -6,120 +6,192 @@
  */
 
 /**
- * remove a datastream from a repository object
+ * Generate a repository objects view.
- * @param object $fedora_object
+ *
- *  tuque FedoraObject
+ * @param FedoraObject $fedora_object
- * @param string $datastream_id
+ *   A Tuque FedoraObject being operated on.
+ * @param object $user
+ *   The user accessing the object.
+ * @param string $page_number
+ *   The page in the content.
+ * @param string $page_size: The size of the page.
+ *
+ * @return array
+ *   An array whose values are markup.
  */
-function hook_islandora_purge_datastream($fedora_object, $datastream_id) {}
+function hook_islandora_view_object($fedora_object, $user, $page_number, $page_size) {}
 
 /**
+ * Generate an object's display for the given content model.
  *
- * @param type $object
+ * Content models PIDs have colons and hyphens changed to underscores, to
- *   tuque FedoraObject
+ * create the hook name.
+ *
+ * @param type $fedora_object
+ *   A Tuque FedoraObject
+ *
+ * @return array
+ *   An array whose values are markup.
  */
-function hook_islandora_purge_object($islandora_object) {}
+function hook_CMODEL_PID_islandora_view_object($fedora_object) {}
+
 
 /**
- * allows modules to add to a repository objects display.  If you implement this
+ * Alter display output after it has been generated.
- * hook you should also register your module for view with the get types hook.
- *
- * islandora gets all displays back in an array and iterates over them.  the order
- * they are displayed is based on the order of the key of the array that each
- * module returns.
- *
- * your module may also want to register a varible that says whether or not it
- * should be part of the default display. Modules can also add secondary tabs as
- * a way to add there output to an islandora display.  the basic image module has
- * samples of both (the secondary tabs examples are commented out)
  *
- * @param type $islandora_object
+ * @param FedoraObject $fedora_object
- *   tuque FedoraObject
+ *   A Tuque FedoraObject being operated on.
+ * @param array $arr
+ *   An arr of rendered views.
  */
-function hook_islandora_view_object($islandora_object) {}
+function hook_islandora_view_object_alter(&$fedora_object, &$arr) {}
 
 /**
- * returns an array listing object types provided by sub modules
+ * Generate an object's management display.
- *  Ex.  array($types['islandora:collectionCModel'][ISLANDORA_VIEW_HOOK] = variable_get('islandora_basic_collection_use_for_default_tab', TRUE);
+ *
- * $types['islandora:collectionCModel'][ISLANDORA_EDIT_HOOK] = FALSE;
+ * @param type $fedora_object
+ *   A Tuque FedoraObject
  *
  * @return array
+ *   An array whose values are markup.
  */
-function hook_islandora_get_types() {}
+function hook_islandora_edit_object($fedora_object) {}
 
 /**
- * allows modules to define an object edit page by cmodel
+ * Generate an object's management display for the given content model.
  *
- * your module should return true for ISLANDORA_EDIT_HOOK in its get_types function
+ * Content models PIDs have colons and hyphens changed to underscores, to
+ * create the hook name.
  *
- * islandora provides a default implementation that should work for most use cases
+ * @param type $fedora_object
- * @param string $islandora_object
+ *   A Tuque FedoraObject
- * @return string
  *
+ * @return array
+ *   An array whose values are markup.
  */
-function hook_islandora_edit_object($islandora_object) {}
+function hook_CMODEL_PID_islandora_edit_object($fedora_object) {}
 
 /**
- * allows modules to alter the fedora object before it is pass through the edit
+ * Allow management display output to be altered.
- * hooks
+ *
- * @param type $islandora_object
+ * @param type $fedora_object
- *   a tugue FedoraObject
+ *   A Tuque FedoraObject
+ * @param type $arr
+ *   an arr of rendered views
  */
-function hook_islandora_edit_object_alter($islandora_object) {}
+function hook_islandora_edit_object_alter(&$fedora_object, &$arr) {}
 
+/**
+ * Allows modules to add to an objects ingest process.
+ *
+ * @param FedoraObject $fedora_object
+ *   A Tuque FedoraObject.
+ */
+function hook_islandora_ingest_post_ingest($fedora_object) {}
 
 /**
- * creates and populates a php Fedora object.
+ * Allow modules to add to the ingest process of a specific content model.
  */
-function hook_islandora_preingest_alter() {}
+function hook_CMODEL_PID_islandora_ingest_post_ingest($fedora_object) {}
 
 /**
- * modules can implement this hook to add or remove datastreams after an
+ * Allows modules to add to a repository objects view/edit(/misc) process.
- * object has been ingested.
  *
- * Each module should check for the newly ingested repository objects content
+ * If you implement this hook you must also register your module with
- * model to make sure it is a type of object they want to act on.
+ * hook_islandora_hook_info().
  *
- * @param type $islandora_object
+ * @param FedoraObject $fedora_object
- *   tugue FeodoraObject
+ *   A Tuque FedoraObject.
+ *
+ * @return array|null
+ *   An associative array with 'deleted' mapped to TRUE--indicating that the
+ *   object should just be marked as deleted, instead of actually being
+ *   purged--or NULL/no return if we just need to do something before the
+ *   is purged.
+ */
+function hook_islandora_pre_purge_object($fedora_object) {}
+
+/**
+ * Allow modules to react to the purge process of a specific content model.
+ *
+ * @see hook_islandora_pre_purge_object()
  */
-function hook_islandora_postingest($islandora_object) {}
+function hook_CMODEL_PID_islandora_pre_purge_object($fedora_object) {}
 
 /**
- * Register potential ingest routes. Implementations should return an array containing possible routes.
+ * Register potential ingest routes.
- * Ex. array(
+ *
- *       array('name' => t('Ingest Route Name'), 'url' => 'ingest_route/url', 'weight' => 0),
+ * Implementations should return an array containing possible routes.
- *     );
  */
-function hook_islandora_ingest_registry($collection_object) {}
+function hook_islandora_ingest_registry($collection_object) {
+  $reg = array(
+    array(
+      'name' => t('Ingest Route Name'),
+      'url' => 'ingest_route/url',
+      'weight' => 0,
+    ),
+  );
+  return $reg
+}
 
 /**
  * Register a datastream edit route/form.
+ *
  * @param $islandora_object
  * @param $ds_id
  */
 function hook_islandora_edit_datastream_registry($islandora_object, $ds_id) {}
 
 /**
- * alter an object before it gets used further down the stack
+ * Alter an object before it gets used further down the stack.
+ *
  * @param type $object
- *   a tuque FedoraObject
+ *   A Tuque FedoraObject
  */
 function hook_islandora_object_alter($fedora_object) {}
 
 /**
- * insert or remove rendered elements by implementing this function
+ * Allow modification of an object before ingesting.
- * in your module
- * @param type $arr
- *   an arr of rendered views
- */
-function hook_islandora_display_alter($arr) {}
-
-/**
  *
  * @param type $islandora_object
- *   a tuque FedoraObject
+ *   A Tuque FedoraObject
  * @param array $content_models
  * @param string $collection_pid
  */
 function hook_islandora_ingest_pre_ingest($islandora_object, $content_models, $collection_pid) {}
+
+/**
+ * Allow modification of objects of a certain content model before ingesting.
+ *
+ * @see hook_islandora_ingest_pre_ingest()
+ */
+function hook_CMODEL_PID_islandora_ingest_pre_ingest($islandora_object, $content_models, $collection_pid) {}
+
+/**
+ * Allow modules to setup for the purge of a datastream.
+ *
+ * @param object $datastream
+ *   A Tuque FedoraDatastream object.
+ */
+function hook_islandora_pre_purge_datastream($datastream) {}
+
+/**
+ * Allow modules to react after a datastream is purged.
+ *
+ * @param object $object
+ *   A Tuque FedoraObject.
+ * @param string $dsid
+ *   A id of the former datastream.
+ */
+function hook_islandora_post_purge_datastream($object, $dsid) {}
+
+/**
+ * Allow modules to react post-purge.
+ *
+ * @param string $object_id
+ *   The former object's PID.
+ * @param array $content_models
+ *   An array containing the models to which the former object.
+ */
+function hook_islandora_post_purge_object($object_id, $content_models) {}
+

islandora.module

@@ -31,9 +31,11 @@ define('FEDORA_PURGE', 'delete fedora objects and datastreams');
 define('FEDORA_MODIFY_STATE', 'modify fedora state');
 define('FEDORA_MANAGE', 'manage fedora items');
 
-// hooks
+// Hooks
 define('ISLANDORA_VIEW_HOOK', 'islandora_view_object');
 define('ISLANDORA_EDIT_HOOK', 'islandora_edit_object');
+define('ISLANDORA_POST_INGEST_HOOK', 'islandora_ingest_post_ingest');
+define('ISLANDORA_PRE_PURGE_OBJECT_HOOK', 'islandora_pre_purge_object');
 
 /**
  * Implements hook_menu().
@@ -249,14 +251,6 @@ function islandora_access_callback($object = NULL, $perm = NULL) {
   return ($namespace_access && user_access($perm));
 }
 
-/**
- * returns an array listing object types provided by sub modules
- * @return array
- */
-function islandora_get_types() {
-  return module_invoke_all('islandora_get_types');
-}
-
 function islandora_init() {
   if (path_is_admin(current_path())) {
     drupal_add_css(drupal_get_path('module', 'islandora') . '/css/islandora.admin.css');
@@ -287,14 +281,30 @@ function islandora_edit_object($object) {
   if (!$object) {
     return drupal_not_found();
   }
-  drupal_alter('islandora_edit_object', $object);
+
-  $arr = module_invoke_all('islandora_edit_object', $object);
+  module_load_include('inc', 'islandora', 'includes/utilities');
-  $output = "";
+
-  foreach ($arr as $key => $value) {
+  // Accumulate the output.
-    $output .= $value; //if we have multiple modules handle one cmodel we need to iterate over multiple
+  $output = array();
+
+  // Call cmodel oriented variants first.
+  foreach (islandora_build_hook_list(ISLANDORA_EDIT_HOOK, $object->models) as $hook) {
+    $temp = module_invoke_all($hook, $object);
+    if (!empty($temp)) {
+      $output = array_merge_recursive($output, $temp);
+    }
+  }
+
+  // Add in the default, if we did not get any results.
+  if (empty($output)) {
+    $output = islandora_default_islandora_edit_object($object);
   }
-  //we could do another module invoke all here to build the edit tab with a default implemented in this module?
+
-  return $output;
+  arsort($output);
+
+  drupal_alter(ISLANDORA_EDIT_HOOK, $object, $output);
+
+  return implode('', $output);
 }
 
 /**
@@ -314,23 +324,25 @@ function islandora_edit_properties($object_id) {
 }
 
 /**
- * builds a default page for the edit tab
+ * Builds a default page for the edit tab.
  *
  * @param object $fedora_object
  *   A tuque Fedora Object
  */
-function islandora_islandora_edit_object($fedora_object) {
+function islandora_default_islandora_edit_object($fedora_object) {
-  $supported_models = islandora_get_types();
+  $output = theme('islandora_default_edit', array(
-  $output = "";
+    'islandora_object' => $fedora_object,
-  foreach ($fedora_object->models as $model) {
+  ));
-    if (isset($supported_models[$model][ISLANDORA_EDIT_HOOK]) && $supported_models[$model][ISLANDORA_EDIT_HOOK] == TRUE) {//another module is handling the view
+
-      return;
+  return array('Default Edit output' => $output);
-    }
-  }
-  $output = theme('islandora_default_edit', array('islandora_object' => $fedora_object));
-  return array('Default edit output' => $output);
 }
 
+/**
+ * Page callback for the path "islandora".
+ *
+ * Redirects to the view of the object indicated by the Drupal variable
+ * islandora_repository_pid.
+ */
 function islandora_view_default_object() {
   $pid = variable_get('islandora_repository_pid', 'islandora:root');
   drupal_goto("islandora/object/$pid");
@@ -346,6 +358,8 @@ function islandora_view_default_object() {
  */
 function islandora_view_object($fedora_object = NULL) {
   module_load_include('inc', 'islandora', 'includes/breadcrumb');
+  module_load_include('inc', 'islandora', 'includes/utilities');
+
   global $user;
 
   if (!$fedora_object) {
@@ -358,37 +372,38 @@ function islandora_view_object($fedora_object = NULL) {
   $page_number = (empty($_GET['page'])) ? '1' : $_GET['page'];
   $page_size = (empty($_GET['pagesize'])) ? '10' : $_GET['pagesize'];
 
-  drupal_alter('islandora_object', $fedora_object); //modify object if required before it is passed along
+  // Accumulate the output.
-  $arr = module_invoke_all('islandora_view_object', $fedora_object, $user, $page_number, $page_size); //allow submodules to decide how to handle content base on object type
+  $output = array();
-  if (empty($arr)) {
+
-    //TODO: make sure we iterate over the array as they will be more then one cmodel per object
+  // Call cmodel oriented variants first.
-    drupal_set_message(t('there was an error loading the view for Islandora object "%s"', array('%s' => $fedora_object->label)), 'error');
+  foreach (islandora_build_hook_list(ISLANDORA_VIEW_HOOK, $fedora_object->models) as $hook) {
-    return "";
+    $temp = module_invoke_all($hook, $fedora_object, $user, $page_number, $page_size);
+    if (!empty($temp)) {
+      $output = array_merge_recursive($output, $temp);
     }
-  arsort($arr);
-  drupal_alter('islandora_display', $arr);
-  $output = "";
-  foreach ($arr as $key => $value) {
-    $output .= $value; //if we have multiple modules handle one cmodel we need to iterate over multiple
   }
-  return $output;
+
+  // Add in the default, if we did not get any results.
+  if (empty($output)) {
+    $output = islandora_default_islandora_view_object($fedora_object);
+  }
+
+  arsort($output);
+ 
+  drupal_alter(ISLANDORA_VIEW_HOOK, $fedora_object, $output);
+
+  return implode('', $output);
 }
 
 /**
- * The default view hook.  If there are no modules registered to handle this objects cmodels or there are
+ * If there are no modules registered to handle this objects cmodels or there are
  * not any cmodels specified this will create a default display.
  *
- * @param string $object_id
+ * @param FedoraObject $object
- * @return string
+ *   The object whose display we are to render.
+ * @return array
  */
-function islandora_islandora_view_object($object) {
+function islandora_default_islandora_view_object($object) {
-  $supported_models = islandora_get_types();
-  $output = "";
-  foreach ($object->models as $model) {
-    if (isset($supported_models[$model][ISLANDORA_VIEW_HOOK]) && (boolean) $supported_models[$model][ISLANDORA_VIEW_HOOK] === TRUE) { //another module is handling the view
-      return;
-    }
-  }
   $output = theme('islandora_default', array('islandora_object' => $object));
   return array('Default output' => $output);
 }
@@ -460,7 +475,7 @@ function islandora_permission() {
  */
 function islandora_object_load($object_id) {
   module_load_include('inc', 'islandora', 'includes/tuque');
-  static $islandora_tuque = NULL;
+  $islandora_tuque = &drupal_static(__FUNCTION__);
 
   if (!$islandora_tuque) {
     $islandora_tuque = new IslandoraTuque();
@@ -472,6 +487,8 @@ function islandora_object_load($object_id) {
     } catch (Exception $e) {
       return NULL;
     }
+
+    drupal_alter('islandora_object', $fedora_object);
     return $fedora_object;
   }
   else {
@@ -500,8 +517,19 @@ function islandora_object_purge($object_id) {
     drupal_set_message(t('Could not remove object, object not found'));
     return;
   }
+
+  module_load_include('inc',  'islandora', 'includes/utilities');
+
   $content_models = $object->models;
-  $arr = module_invoke_all('islandora_pre_purge_object', $object); // notify modules of pending deletion
+  
+  $arr = array();
+  foreach (islandora_build_hook_list(ISLANDORA_PRE_PURGE_OBJECT_HOOK, $object->models) as $hook) {
+    $temp = module_invoke_all($hook, $object);
+    if (!empty($temp)) {
+      $arr = array_merge_recursive($arr, $temp);
+    }
+  }
+
   if (isset($arr['delete']) && $arr['delete']) {
     try {
       $object->delete();
@@ -518,6 +546,7 @@ function islandora_object_purge($object_id) {
       return "";
     }
   }
+
   module_invoke_all('islandora_post_purge_object', $object_id, $content_models);  // notify modules post deletion
 }