/**
* Returns list of all items that are in cart for that user.
*
* @param userId
* @return
*/
public List<CartItem> getCartItemsFromUserId(int userId) {
// Declare mapper
DynamoDBMapper mapper = this.conn.getMapper();
// Create hash key values which to form a query
CartItem hashKeyValues = new CartItem();
hashKeyValues.setUserId(userId);
// Form a query
DynamoDBQueryExpression<CartItem> queryExpression =
new DynamoDBQueryExpression<CartItem>()
.withHashKeyValues(hashKeyValues)
.withQueryFilterEntry(
"IsOrdered",
new Condition()
.withComparisonOperator(ComparisonOperator.EQ)
.withAttributeValueList(new AttributeValue().withN("0")));
// add query filter
queryExpression.setHashKeyValues(hashKeyValues);
// execute that query
List<CartItem> itemList = mapper.query(CartItem.class, queryExpression);
for (int i = 0; i < itemList.size(); i++) {
System.out.println(itemList.get(i).getUserId());
System.out.println(itemList.get(i).getCartId());
System.out.println(itemList.get(i).getProductId());
System.out.println(itemList.get(i).getQuantity());
}
// return the first item (we will have only one item)
return itemList;
}
/**
* Saves Item into the cart. - DynamoDB.
*
* @param form
*/
public void saveCartItem(AddToCartForm form) {
DynamoDBMapper mapper = this.conn.getMapper();
CartItem item = new CartItem();
item.setCartId(UUID.randomUUID().getLeastSignificantBits());
item.setProductId(form.getProductId());
item.setQuantity(form.getQuantity());
item.setUserId(form.getUserId());
item.setIsOrdered(form.getIsOrdered());
mapper.save(item);
}