DynamoDB count total rows that match key and filter expression also fixes the reserved word issues

DynamoDBCount.java

Table table = dynamoDB.getTable(UserActivity.Table.TableName);

Map<String, Object> valueMap = new HashMap<>();
valueMap.put(":user_id", getUserId());
valueMap.put(":state", UserActivity.STATE_ACTIVE);
valueMap.put(":type", type);

QuerySpec spec = new QuerySpec()
        .withNameMap(new NameMap()
                .with("#s", "State").with("#t", "Type"))
        .withKeyConditionExpression("UserId = :user_id")
        .withFilterExpression("#s = :state and #t = :type")
        .withValueMap(valueMap);
spec.withSelect(Select.COUNT);

ItemCollection<QueryOutcome> items = table.query(spec);
for (Item item : items) {
    Logger.of(getClass()).info(item.toJSONPretty());
}

return items.getTotalCount();