Extracting out the std. attributes impl details

Author: anithakathir

src/main/java/com/indix/query/SearchQuery.java

@@ -56,10 +56,18 @@ public SearchQuery withCategoryId(List<Integer> categoryId) {
 
     /**
      * Combined with any of query/brand/category/store, limits results to products with specific attribute values
+     * NOTE:
+     * Prepends attribute filter key with "attr.", since product attributes are identified that way.
+     * Examples of a few product attribute keys and values are:
+     *      1. color -> red / blue / green / black
+     *      2. size -> xs / s / m / l / xl
+     *      3. gender -> mens / womens
+     * A schema for the filterable keys and values isn't in place yet.
+     * When the standard schema is published, the filterable keys for a category and the list of values for the same will be available.
      */
     public SearchQuery withAttrFilter(String attrFilterKey, List<String> attrFilterValues) {
         for (String attrValue: attrFilterValues) {
-            parameters.add(new BasicNameValuePair(attrFilterKey, attrValue));
+            parameters.add(new BasicNameValuePair("attr."+attrFilterKey, attrValue));
         }
         return this;
     }

src/test/java/com/indix/query/SearchQueryTest.java

@@ -58,8 +58,8 @@ public void testBasicQuery() {
                 .withSortBy(SearchQuery.SortBy.PRICE_HIGH_TO_LOW)
                 .withFacetBy(Arrays.asList("storeId", "brandId"))
                 .withAttrFacetBy(Arrays.asList("attr.color", "attr.size"))
-                .withAttrFilter("attr.color", Arrays.asList("black", "red"))
-                .withAttrFilter("attr.size", Arrays.asList("xs"))
+                .withAttrFilter("color", Arrays.asList("black", "red"))
+                .withAttrFilter("size", Arrays.asList("xs"))
                 .withPageNumber(5)
                 .withPageSize(55)
                 .withCountryCode("US")