--- a/src/js/serializers/JSONSerializer.js	Fri Dec 02 10:56:38 2011 +0100
+++ b/src/js/serializers/JSONSerializer.js	Fri Dec 02 17:31:50 2011 +0100
@@ -39,9 +39,9 @@
 
 /* this function searches for an annotation which matches title, description and keyword 
    "" matches any field. 
+   Note: it ignores tweets.
 */    
 IriSP.JSONSerializer.prototype.searchAnnotations = function(title, description, keyword) {
- 
     /* we can have many types of annotations. We want search to only look for regular segments */
     /* the next two lines are a bit verbose because for some test data, _serializer.data.view is either
        null or undefined.
@@ -57,10 +57,61 @@
             searchViewType = view.annotation_types[0];
     }
 
+    var filterfn = function(annotation) {
+      if( searchViewType  != "" && 
+          typeof(annotation.meta) !== "undefined" && 
+          typeof(annotation.meta["id-ref"]) !== "undefined" &&
+          annotation.meta["id-ref"] !== searchViewType) {
+        return true; // don't pass
+      } else {
+          return false;
+      }
+    };
+
+    return this.searchAnnotationsFilter(title, description, keyword, filterfn);
+
+};
+
+/* only look for tweets */
+IriSP.JSONSerializer.prototype.searchTweets = function(title, description, keyword) {
+    /* we can have many types of annotations. We want search to only look for regular segments */
+    /* the next two lines are a bit verbose because for some test data, _serializer.data.view is either
+       null or undefined.
+    */
+    var view;
+
+    if (typeof(this._data.views) !== "undefined" && this._data.views !== null)
+       view = this._data.views[0];
+
+    var searchViewType = "";
+
+    if(typeof(view) !== "undefined" && typeof(view.annotation_types) !== "undefined" && view.annotation_types.length > 1) {
+            searchViewType = view.annotation_types[0];
+    }
+
+    var filterfn = function(annotation) {
+      if( searchViewType  != "" && 
+          typeof(annotation.meta) !== "undefined" && 
+          typeof(annotation.meta["id-ref"]) !== "undefined" &&
+          annotation.meta["id-ref"] !== searchViewType) {
+        return false; // pass
+      } else {
+          return true;
+      }
+    };
+
+    return this.searchAnnotationsFilter(title, description, keyword, filterfn);
+
+};
+
+/*
+  the previous function call this one, which is more general:
+ */    
+IriSP.JSONSerializer.prototype.searchAnnotationsFilter = function(title, description, keyword, filter) {
+
     var rTitle;
     var rDescription;
     var rKeyword;
-    
     /* match anything if given the empty string */
     if (title == "")
       title = ".*";
@@ -80,11 +131,10 @@
       var annotation = this._data.annotations[i];
       
       /* filter the annotations whose type is not the one we want */
-      if (searchViewType  != "" && typeof(annotation.meta) !== "undefined" && typeof(annotation.meta["id-ref"]) !== "undefined"
-            && annotation.meta["id-ref"] !== searchViewType) {
+      if (filter(annotation)) {
           continue;
       }
-    
+      
       if (rTitle.test(annotation.content.title) && 
           rDescription.test(annotation.content.description)) {
           /* FIXME : implement keyword support */
@@ -128,6 +178,39 @@
   return ret;
 };
 
+/* breaks a string in words and searches each of these words. Returns an array
+   of objects with the id of the annotation and its number of occurences.
+   
+   FIXME: optimize ? seems to be n^2 in the worst case.
+*/
+IriSP.JSONSerializer.prototype.searchTweetsOccurences = function(searchString) {
+  var ret = { };
+  var keywords = searchString.split(/\s+/);
+  
+  for (var i in keywords) {
+    var keyword = keywords[i];
+    
+    // search this keyword in descriptions and title
+    var found_annotations = []
+    found_annotations = found_annotations.concat(this.searchTweets(keyword, "", ""));
+    found_annotations = found_annotations.concat(this.searchTweets("", keyword, ""));
+    
+    for (var j in found_annotations) {
+      var current_annotation = found_annotations[j];
+      
+      if (!ret.hasOwnProperty(current_annotation.id)) {
+        ret[current_annotation.id] = 1;
+      } else {
+        ret[current_annotation.id] += 1;
+      }
+      
+    }
+
+  };
+  
+  return ret;
+};
+
 /* takes the currentTime and returns all the annotations that are displayable at the moment 
    NB: only takes account the first type of annotations - ignores tweets 
    currentTime is in seconds.