Adds support for faceting by product attributes

Author: anithakathir

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

@@ -224,6 +224,16 @@ public SearchQuery withFacetBy(List<String> facetBy) {
         return this;
     }
 
+    /**
+     * Facet by product attribute values
+     */
+    public SearchQuery withAttrFacetBy(List<String> attrFacetBy) {
+        for (String attrFacet : attrFacetBy) {
+            parameters.add(new BasicNameValuePair("attrFacetBy", attrFacet));
+        }
+        return this;
+    }
+
     /**
      * Specifies the page number of the result set to return. 10 results per page.
      */

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

@@ -41,6 +41,8 @@ public void testBasicQuery() {
         expectedValue.add(new BasicNameValuePair("sortBy", "PRICE_HIGH_TO_LOW"));
         expectedValue.add(new BasicNameValuePair("facetBy", "storeId"));
         expectedValue.add(new BasicNameValuePair("facetBy", "brandId"));
+        expectedValue.add(new BasicNameValuePair("attrFacetBy", "attr.color"));
+        expectedValue.add(new BasicNameValuePair("attrFacetBy", "attr.size"));
         expectedValue.add(new BasicNameValuePair("attr.color", "black"));
         expectedValue.add(new BasicNameValuePair("attr.color", "red"));
         expectedValue.add(new BasicNameValuePair("attr.size", "xs"));
@@ -55,6 +57,7 @@ public void testBasicQuery() {
                 .withSku("sku1")
                 .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"))
                 .withPageNumber(5)