First attempt to add paging in the OPDS side.

Need more polishing before being used everywhere.

--HG--
extra : rebase_source : 0fb3a4b12cf83d4b450a1fca81f82addd8d58c14

OPDS_renderer.php

@@ -200,18 +200,27 @@ class OPDSRenderer
     }
     
     public function render ($page) {
+        global $config;
         self::startXmlDocument ($page->title, $page->idPage);
-        if ($page->query)
+        if ($config['cops_max_item_per_page'] != -1 && $page->totalNumber != -1)
         {
             self::getXmlStream ()->startElement ("opensearch:totalResults");
-                self::getXmlStream ()->text (count($page->entryArray));
+                self::getXmlStream ()->text ($page->totalNumber);
             self::getXmlStream ()->endElement ();
             self::getXmlStream ()->startElement ("opensearch:itemsPerPage");
-                self::getXmlStream ()->text (count($page->entryArray));
+                self::getXmlStream ()->text ($config['cops_max_item_per_page']);
             self::getXmlStream ()->endElement ();
             self::getXmlStream ()->startElement ("opensearch:startIndex");
-                self::getXmlStream ()->text ("1");
+                self::getXmlStream ()->text (($page->n - 1) * $config['cops_max_item_per_page'] + 1);
             self::getXmlStream ()->endElement ();
+            $currentUrl = $_SERVER['QUERY_STRING'];
+            $currentUrl = preg_replace ("/\&n=.*?$/", "", "?" . $_SERVER['QUERY_STRING']);
+            if ($page->n > 1) {
+                self::renderLink (new LinkNavigation ($currentUrl . "&n=" . ($page->n - 1), "previous", "Page precedente"));
+            }
+            if (($page->n + 1) * $config['cops_max_item_per_page'] < $page->totalNumber) {
+                self::renderLink (new LinkNavigation ($currentUrl . "&n=" . ($page->n + 1), "next", "Page suivante"));
+            }
         }
         foreach ($page->entryArray as $entry) {
             self::getXmlStream ()->startElement ("entry");

base.php

@@ -80,6 +80,7 @@ class Link
     const OPDS_IMAGE_TYPE = "http://opds-spec.org/image";
     const OPDS_ACQUISITION_TYPE = "http://opds-spec.org/acquisition";
     const OPDS_NAVIGATION_TYPE = "application/atom+xml;profile=opds-catalog;kind=navigation";
+    const OPDS_PAGING_TYPE = "application/atom+xml;profile=opds-catalog;kind=acquisition";
     
     public $href;
     public $type;
@@ -190,43 +191,46 @@ class Page
     public $idPage;
     public $idGet;
     public $query;
+    public $n;
+    public $totalNumber = -1;
     public $entryArray = array();
     
-    public static function getPage ($pageId, $id, $query)
+    public static function getPage ($pageId, $id, $query, $n)
     {
         switch ($pageId) {
             case Base::PAGE_ALL_AUTHORS :
-                return new PageAllAuthors ($id, $query);
+                return new PageAllAuthors ($id, $query, $n);
             case Base::PAGE_AUTHOR_DETAIL :
-                return new PageAuthorDetail ($id, $query);
+                return new PageAuthorDetail ($id, $query, $n);
             case Base::PAGE_ALL_TAGS :
-                return new PageAllTags ($id, $query);
+                return new PageAllTags ($id, $query, $n);
             case Base::PAGE_TAG_DETAIL :
-                return new PageTagDetail ($id, $query);
+                return new PageTagDetail ($id, $query, $n);
             case Base::PAGE_ALL_SERIES :
-                return new PageAllSeries ($id, $query);
+                return new PageAllSeries ($id, $query, $n);
             case Base::PAGE_ALL_BOOKS :
-                return new PageAllBooks ($id, $query);
+                return new PageAllBooks ($id, $query, $n);
             case Base::PAGE_ALL_BOOKS_LETTER:
-                return new PageAllBooksLetter ($id, $query);
+                return new PageAllBooksLetter ($id, $query, $n);
             case Base::PAGE_ALL_RECENT_BOOKS :
-                return new PageRecentBooks ($id, $query);
+                return new PageRecentBooks ($id, $query, $n);
             case Base::PAGE_SERIE_DETAIL : 
-                return new PageSerieDetail ($id, $query);
+                return new PageSerieDetail ($id, $query, $n);
             case Base::PAGE_OPENSEARCH_QUERY :
-                return new PageQueryResult ($id, $query);
+                return new PageQueryResult ($id, $query, $n);
                 break;
             default:
-                $page = new Page ($id, $query);
+                $page = new Page ($id, $query, $n);
                 $page->idPage = "cops:catalog";
                 return $page;
         }
     }
     
-    public function __construct($pid, $pquery) {
+    public function __construct($pid, $pquery, $pn) {
         $this->idGet = $pid;
         $this->query = $pquery;
-    }    
+        $this->n = $pn;
+    }
     
     public function InitializeContent () 
     {
@@ -318,7 +322,7 @@ class PageAllBooksLetter extends Page
     public function InitializeContent () 
     {
         $this->title = str_format (localize ("splitByLetter.letter"), localize ("bookword.title"), $this->idGet);
-        $this->entryArray = Book::getBooksByStartingLetter ($this->idGet);
+        list ($this->entryArray, $this->totalNumber) = Book::getBooksByStartingLetter ($this->idGet, $this->n);
         $this->idPage = Book::getEntryIdByLetter ($this->idGet);
     }
 }
@@ -373,6 +377,28 @@ abstract class Base
             }
         }
         return self::$db;
-    }    
+    }
+    
+    public static function executeQuery($query, $columns, $params, $n) {
+        global $config;
+        $totalResult = -1;
+        
+        if ($config['cops_max_item_per_page'] != -1)
+        {
+            // First check total number of results
+            $result = self::getDb ()->prepare (str_format ($query, "count(*)"));
+            $result->execute ($params);
+            $totalResult = $result->fetchColumn ();
+            
+            // Next modify the query and params
+            $query .= " limit ?, ?";
+            array_push ($params, ($n - 1) * $config['cops_max_item_per_page'], $config['cops_max_item_per_page']);
+        }
+        
+        $result = self::getDb ()->prepare(str_format ($query, $columns));
+        $result->execute ($params);
+        return array ($totalResult, $result);
+    }
+
 }
 ?>

book.php

@@ -363,19 +363,17 @@ order by substr (upper (sort), 1, 1)");
         return $entryArray;
     }
     
-    public static function getBooksByStartingLetter($letter) {
-        $result = parent::getDb ()->prepare('select ' . self::BOOK_COLUMNS . '
+    public static function getBooksByStartingLetter($letter, $n) {
+        list ($totalNumber, $result) = parent::executeQuery ('select {0} 
 from books left outer join comments on book = books.id
-where upper (books.sort) like ?');
+where upper (books.sort) like ?', self::BOOK_COLUMNS, array ($letter . "%"), $n);
         $entryArray = array();
-        $queryLike = $letter . "%";
-        $result->execute (array ($queryLike));
         while ($post = $result->fetchObject ())
         {
             $book = new Book ($post);
             array_push ($entryArray, $book->getEntry ());
         }
-        return $entryArray;
+        return array ($entryArray, $totalNumber);
     }
 
     

config_default.php

@@ -97,5 +97,11 @@
      *  0 : always generate valid OPDS code
      */
     $config['cops_generate_invalid_opds_stream'] = "0"; 
+    
+    /*
+     * Max number of items per page
+     */
+    $config['cops_max_item_per_page'] = "2"; 
+
      
 ?>

feed.php

@@ -18,6 +18,7 @@
     header ("Content-Type:application/xml");
     $page = getURLParam ("page", Base::PAGE_INDEX);
     $query = getURLParam ("query");
+    $n = getURLParam ("n", "1");
     if ($query)
         $page = Base::PAGE_OPENSEARCH_QUERY;
     $qid = getURLParam ("id");
@@ -29,7 +30,7 @@
             echo $OPDSRender->getOpenSearch ();
             return;
         default:
-            $currentPage = Page::getPage ($page, $qid, $query);
+            $currentPage = Page::getPage ($page, $qid, $query, $n);
             $currentPage->InitializeContent ();
             echo $OPDSRender->render ($currentPage);
             return;