diff -r 000000000000 -r 6474c204b198 dom/activities/src/ActivitiesServiceFilter.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/activities/src/ActivitiesServiceFilter.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,129 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict"
+
+this.EXPORTED_SYMBOLS = ['ActivitiesServiceFilter'];
+
+this.ActivitiesServiceFilter = {
+  match: function(aValues, aFilters) {
+
+    function matchValue(aValue, aFilter, aFilterObj) {
+      if (aFilter !== null) {
+        // Custom functions for the different types.
+        switch (typeof(aFilter)) {
+        case 'boolean':
+          return aValue === aFilter;
+
+        case 'number':
+          return Number(aValue) === aFilter;
+
+        case 'string':
+          return String(aValue) === aFilter;
+
+        default: // not supported
+          return false;
+        }
+      }
+
+      // Pattern.
+      if (('pattern' in aFilterObj)) {
+        var pattern = String(aFilterObj.pattern);
+
+        var patternFlags = '';
+        if (('patternFlags' in aFilterObj)) {
+          patternFlags = String(aFilterObj.patternFlags);
+        }
+
+        var re = new RegExp('^(?:' + pattern + ')$', patternFlags);
+        return re.test(aValue);
+      }
+
+      // Validation of the min/Max.
+      if (('min' in aFilterObj) || ('max' in aFilterObj)) {
+        // Min value.
+        if (('min' in aFilterObj) &&
+            aFilterObj.min > aValue) {
+          return false;
+        }
+
+        // Max value.
+        if (('max' in aFilterObj) &&
+            aFilterObj.max < aValue) {
+          return false;
+        }
+      }
+
+      return true;
+    }
+
+    // this function returns true if the value matches with the filter object
+    function matchObject(aValue, aFilterObj) {
+
+      // Let's consider anything an array.
+      let filters = ('value' in aFilterObj)
+                      ? (Array.isArray(aFilterObj.value)
+                          ? aFilterObj.value
+                          : [aFilterObj.value])
+                      : [ null ];
+      let values  = Array.isArray(aValue) ? aValue : [aValue];
+
+      for (var filterId = 0; filterId < filters.length; ++filterId) {
+        for (var valueId = 0; valueId < values.length; ++valueId) {
+          if (matchValue(values[valueId], filters[filterId], aFilterObj)) {
+            return true;
+          }
+        }
+      }
+
+      return false;
+    }
+
+    // Creation of a filter map useful to know what has been
+    // matched and what is not.
+    let filtersMap = {}
+    for (let filter in aFilters) {
+      // Convert this filter in an object if needed
+      let filterObj = aFilters[filter];
+
+      if (Array.isArray(filterObj) || typeof(filterObj) !== 'object') {
+        filterObj = {
+          required: false,
+          value: filterObj
+        }
+      }
+
+      filtersMap[filter] = { filter: filterObj,
+                             found:  false };
+    }
+
+    // For any incoming property.
+    for (let prop in aValues) {
+      // If this is unknown for the app, let's continue.
+      if (!(prop in filtersMap)) {
+        continue;
+      }
+
+      if (Array.isArray(aValues[prop]) && aValues[prop].length == 0) {
+        continue;
+      }
+
+      // Otherwise, let's check the value against the filter.
+      if (!matchObject(aValues[prop], filtersMap[prop].filter)) {
+        return false;
+      }
+
+      filtersMap[prop].found = true;
+    }
+
+    // Required filters:
+    for (let filter in filtersMap) {
+      if (filtersMap[filter].filter.required && !filtersMap[filter].found) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}