Updated startWithFilterBuilder(), endWithFilterBuilder(), containsFilterBuilder() to support case insensitive comparisons.

Author: Jalina2007

components/api-resource-mgt/org.wso2.carbon.identity.api.resource.mgt/src/main/java/org/wso2/carbon/identity/api/resource/mgt/util/FilterQueriesUtil.java

@@ -191,24 +191,27 @@ private static void notEqualFilterBuilder(int count, String value, String attrib
     private static void startWithFilterBuilder(int count, String value, String attributeName, StringBuilder filter,
                                                FilterQueryBuilder filterQueryBuilder) {
 
-        String filterString = " LIKE ? AND ";
-        filter.append(attributeName).append(filterString);
+        String filterString = " LIKE LOWER(?) AND ";
+        String attributeNameWithLowerCaseFunction = "LOWER(" + attributeName + ")";
+        filter.append(attributeNameWithLowerCaseFunction).append(filterString);
         filterQueryBuilder.setFilterAttributeValue(count, value + "%");
     }
 
     private static void endWithFilterBuilder(int count, String value, String attributeName, StringBuilder filter,
                                              FilterQueryBuilder filterQueryBuilder) {
 
-        String filterString = " LIKE ? AND ";
-        filter.append(attributeName).append(filterString);
+        String filterString = " LIKE LOWER(?) AND ";
+        String attributeNameWithLowerCaseFunction = "LOWER(" + attributeName + ")";
+        filter.append(attributeNameWithLowerCaseFunction).append(filterString);
         filterQueryBuilder.setFilterAttributeValue(count, "%" + value);
     }
 
     private static void containsFilterBuilder(int count, String value, String attributeName, StringBuilder filter,
                                               FilterQueryBuilder filterQueryBuilder) {
 
-        String filterString = " LIKE ? AND ";
-        filter.append(attributeName).append(filterString);
+        String filterString = " LIKE LOWER(?) AND ";
+        String attributeNameWithLowerCaseFunction = "LOWER(" + attributeName + ")";
+        filter.append(attributeNameWithLowerCaseFunction).append(filterString);
         filterQueryBuilder.setFilterAttributeValue(count, "%" + value + "%");
     }