feature 1622 added: pwg.categories.getList is now able to return a tree with

the new "tree_output" option. Only compatible with json/php output formats.


git-svn-id: http://piwigo.org/svn/branches/2.2@11152 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_category.inc.php

@@ -533,4 +533,34 @@ SELECT image_id
 
   return $image_id;
 }
+
+/**
+ * create a tree from a flat list of categories, no recursivity for high speed
+ */
+function categories_flatlist_to_tree($categories)
+{
+  $tree = array();
+  $key_of_cat = array();
+  
+  foreach ($categories as $key => &$node)
+  {
+    $key_of_cat[$node['id']] = $key;
+    
+    if (!isset($node['id_uppercat']))
+    {
+      $tree[$key] = &$node;
+    }
+    else
+    {
+      if (!isset($categories[ $key_of_cat[ $node['id_uppercat'] ] ]['sub_categories']))
+      {
+        $categories[ $key_of_cat[ $node['id_uppercat'] ] ]['sub_categories'] = array();
+      }
+      
+      $categories[ $key_of_cat[ $node['id_uppercat'] ] ]['sub_categories'][$key] = &$node;
+    }
+  }
+  
+  return $tree;
+}
 ?>

include/ws_functions.inc.php

@@ -432,6 +432,22 @@ function ws_categories_getList($params, &$service)
 {
   global $user,$conf;
 
+  if ($params['tree_output'])
+  {
+    if (!isset($_GET['format']) or !in_array($_GET['format'], array('php', 'json')))
+    {
+      // the algorithm used to build a tree from a flat list of categories
+      // keeps original array keys, which is not compatible with
+      // PwgNamedArray.
+      //
+      // PwgNamedArray is useful to define which data is an attribute and
+      // which is an element in the XML output. The "hierarchy" output is
+      // only compatible with json/php output.
+      
+      return new PwgError(405, "The tree_output option is only compatible with json/php output formats");
+    }
+  }
+
   $where = array('1=1');
   $join_type = 'INNER';
   $join_user = $user['id'];
@@ -471,7 +487,7 @@ function ws_categories_getList($params, &$service)
   }
 
   $query = '
-SELECT id, name, permalink, uppercats, global_rank,
+SELECT id, name, permalink, uppercats, global_rank, id_uppercat,
     comment,
     nb_images, count_images AS total_nb_images,
     date_last, max_date_last, count_categories AS nb_categories
@@ -514,6 +530,13 @@ SELECT id, name, permalink, uppercats, global_rank,
     array_push($cats, $row);
   }
   usort($cats, 'global_rank_compare');
+
+  if ($params['tree_output'])
+  { 
+    return categories_flatlist_to_tree($cats);
+  }
+  else
+  {
     return array(
       'categories' => new PwgNamedArray(
         $cats,
@@ -529,6 +552,7 @@ SELECT id, name, permalink, uppercats, global_rank,
           )
         )
       );
+  }
 }
 
 /**

ws.php

@@ -81,8 +81,9 @@ function ws_addDefaultMethods( $arr )
         'cat_id' => array('default'=>0),
         'recursive' => array('default'=>false),
         'public' => array('default'=>false),
+        'tree_output' => array('default'=>false),
       ),
-      'retrieves a list of categories' );
+      'retrieves a list of categories (tree_output option only compatible with json/php output format' );
 
   $service->addMethod('pwg.images.addComment', 'ws_images_addComment',
       array(