| /* |
| * 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. |
| */ |
| |
| /* $Rev$ $Date$ */ |
| |
| /** |
| * Shopping cart component implementation. |
| */ |
| |
| #include "string.hpp" |
| #include "function.hpp" |
| #include "list.hpp" |
| #include "value.hpp" |
| #include "monad.hpp" |
| |
| namespace tuscany { |
| namespace store { |
| |
| const string cartId("1234"); |
| |
| /** |
| * Get the shopping cart from the cache. Return an empty |
| * cart if not found. |
| */ |
| const list<value> getcart(const value& id, const lvvlambda& cache) { |
| const value cart = cache(mklist<value>("get", mklist<value>(id))); |
| cerr << "cart value: " << cart << "\n"; |
| const failable<value> fcart = cart; |
| cerr << "cart fvalue: " << fcart << "\n"; |
| cerr << "cart content: " << content(fcart) << "\n"; |
| cerr << "cart reason: " << reason(fcart) << "\n"; |
| if (isNil(cart)) |
| return value(nilListValue); |
| return (list<value>)cart; |
| } |
| |
| /** |
| * Post a new item to the cart. Create a new cart if necessary. |
| */ |
| const failable<value> post(unused const list<value>& collection, const value& item, const lvvlambda& cache) { |
| const value id(mkuuid()); |
| const list<value> newItem(mklist<value>("entry", cadr<value>(car<value>(item)), mklist<value>("id", id), cadddr<value>(car<value>(item)))); |
| const list<value> cart(cons<value>(newItem, getcart(cartId, cache))); |
| cache(mklist<value>("put", mklist<value>(cartId), cart)); |
| return value(mklist<value>(id)); |
| } |
| |
| /** |
| * Find an item in the cart. |
| */ |
| const value find(const value& id, const list<value>& cart) { |
| if (isNil(cart)) |
| return mklist<value>(mklist<value>("entry", mklist<value>("title", string("Item")), mklist<value>("id", "0"))); |
| if (id == cadr<value>(caddr<value>(car(cart)))) |
| return mklist<value>(car(cart)); |
| return find(id, cdr(cart)); |
| } |
| |
| /** |
| * Return items from the cart. |
| */ |
| const failable<value> get(const list<value>& id, const lvvlambda& cache) { |
| if (isNil(id)) |
| return value(mklist<value>(append(mklist<value>("feed", mklist<value>("title", string("Your Cart")), mklist<value>("id", cartId)), getcart(cartId, cache)))); |
| return find(car(id), getcart(cartId, cache)); |
| } |
| |
| /** |
| * Delete items from the cart. |
| */ |
| const failable<value> del(const list<value>& id, unused const lvvlambda& cache) { |
| if (isNil(id)) |
| return cache(mklist<value>("delete", mklist<value>(cartId))); |
| return trueValue; |
| } |
| |
| /** |
| * Return the price of an item. |
| */ |
| const double price(const list<value>& item) { |
| return cadr<value>(assoc<value>("price", cdr<value>(cadr<value>(cadddr(item))))); |
| } |
| |
| /** |
| * Sum the prices of a list of items. |
| */ |
| const double sum(const list<value>& items) { |
| if (isNil(items)) |
| return 0; |
| return price(car(items)) + sum(cdr(items)); |
| } |
| |
| /** |
| * Return the total price of the items in the cart. |
| */ |
| const failable<value> total(const lvvlambda& cache) { |
| const list<value> cart(getcart(cartId, cache)); |
| return value(sum(cart)); |
| } |
| |
| } |
| } |
| |
| extern "C" { |
| |
| const tuscany::value apply(const tuscany::list<tuscany::value>& params) { |
| const tuscany::value func(car(params)); |
| if (func == "post") |
| return tuscany::store::post(cadr(params), caddr(params), cadddr(params)); |
| if (func == "get") |
| return tuscany::store::get(cadr(params), caddr(params)); |
| if (func == "delete") |
| return tuscany::store::del(cadr(params), caddr(params)); |
| if (func == "total") |
| return tuscany::store::total(cadr(params)); |
| return tuscany::mkfailure<tuscany::value>(); |
| } |
| |
| } |