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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package store;
import static org.apache.tuscany.IterableUtil.*;
import static org.apache.tuscany.UUIDUtil.*;
import org.apache.tuscany.Service;
/**
* Shopping cart component implementation.
*/
public class ShoppingCartImpl {
static String cartId = "1234";
/**
* Get the shopping cart from the cache. Return an empty cart if not found.
*/
public Iterable<?> getcart(final String id, final Service cache) {
final Iterable<String> iid = list(id);
final Iterable<?> cart = cache.get(iid);
if(cart == null)
return list();
return cart;
}
/**
* Post a new item to the cart. Create a new cart if necessary.
*/
public Iterable<String> post(final Iterable<String> collection, final Iterable<?> item, final Service cache) {
final String id = uuid();
final Iterable<?> newItem = list(car(item), id, caddr(item));
final Iterable<?> cart = cons(newItem, this.getcart(cartId, cache));
final Iterable<String> iid = list(cartId);
cache.put(iid, cart);
return list(id);
}
/**
* Find an item in the cart.
*/
Iterable<?> find(final String id, final Iterable<?> cart) {
if(isNil(cart))
return cons("Item", list("0", list()));
if(id.equals(cadr(car(cart))))
return car(cart);
return this.find(id, cdr(cart));
}
/**
* Return items from the cart.
*/
public Iterable<?> get(final Iterable<String> id, final Service cache) {
if(isNil(id))
return cons("Your Cart", cons(cartId, this.getcart(cartId, cache)));
return this.find((String)car(id), this.getcart(cartId, cache));
}
/**
* Delete items from the cart.
*/
public Boolean delete(final Iterable<String> id, final Service cache) {
if(isNil(id)) {
final Iterable<String> iid = list(cartId);
return cache.delete(iid);
}
return true;
}
/**
* Return the price of an item.
*/
Double price(final Iterable<?> item) {
return Double.valueOf((String)cadr(assoc("'price", caddr(item))));
}
/**
* Sum the prices of a list of items.
*/
Double sum(final Iterable<?> items) {
if(isNil(items))
return 0.0;
return this.price((Iterable<?>)car(items)) + this.sum(cdr(items));
}
/**
* Return the total price of the items in the cart.
*/
public Double total(final Service cache) {
final Iterable<?> cart = this.getcart(cartId, cache);
return this.sum(cart);
}
}
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