move getting books by chung to base function

NetBiblio.php

@@ -64,6 +64,19 @@ class NetBiblio extends WebService
      * @throws WebException
      */
     private function GetBooks(array $codes) {
+        // it is faster to do multiple small request to Solr rather than one big so separate
+        // in chunks if we are above the limit. 15 was found by testing and seems to be a sweet spot
+        $limit = 15;
+        $count = count($codes);
+        if(count($codes) > $limit) {
+            $parts = array_chunk($codes, $limit);
+            $books = array();
+            foreach($parts as $p) {
+                $books = array_merge($books, $this->GetBooks($p));
+            }
+            return $books;
+        }
+
         $bs = new BookSearch();
         $bs->addQuery('code:('.implode(' OR ', $codes).')', null, false);
         $results = $bs->getResults(0, count($codes));
@@ -398,23 +411,7 @@ class NetBiblio extends WebService
     public function FindBooks($codes)
     {
         $this->CheckSession();
-
-        $codes = json_decode($codes);
-
-        // it is faster to do multiple small request to Solr rather than one big so separate
-        // in chunks if we are above the limit. 15 was found by testing and seems to be a sweet spot
-        $limit = 15;
-        if(count($codes) > $limit) {
-            $parts = array_chunk($codes, $limit);
-            $books = array();
-            foreach($parts as $p) {
-                $books = array_merge($books, $this->GetBooks($p));
-            }
-        } else {
-            $books = $this->GetBooks($codes);
-        }
-
-        return $this->AddBookData($books);
+        return $this->AddBookData($this->GetBooks(json_decode($codes)));
     }
 
     public function FindBook($code)