2853156a2b
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1428206 13f79535-47bb-0310-9956-ffa450edef68
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/* $Rev$ $Date$ */
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/**
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* Shopping cart component implementation.
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*/
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#include "string.hpp"
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#include "function.hpp"
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#include "list.hpp"
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#include "value.hpp"
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#include "monad.hpp"
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namespace tuscany {
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namespace store {
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const string cartId("1234");
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/**
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* Get the shopping cart from the cache. Return an empty
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* cart if not found.
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*/
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const list<value> getcart(const value& id, const lvvlambda& cache) {
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const value cart = cache(mklist<value>("get", mklist<value>(id)));
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cerr << "cart value: " << cart << "\n";
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const failable<value> fcart = cart;
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cerr << "cart fvalue: " << fcart << "\n";
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cerr << "cart content: " << content(fcart) << "\n";
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cerr << "cart reason: " << reason(fcart) << "\n";
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if (isNull(cart))
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return value(nilListValue);
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return (list<value>)cart;
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}
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/**
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* Post a new item to the cart. Create a new cart if necessary.
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*/
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const failable<value> post(unused const list<value>& collection, const value& item, const lvvlambda& cache) {
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const value id(mkuuid());
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const list<value> newItem(mklist<value>("entry", cadr<value>(car<value>(item)), mklist<value>("id", id), cadddr<value>(car<value>(item))));
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const list<value> cart(cons<value>(newItem, getcart(cartId, cache)));
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cache(mklist<value>("put", mklist<value>(cartId), cart));
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return value(mklist<value>(id));
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}
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/**
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* Find an item in the cart.
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*/
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const value find(const value& id, const list<value>& cart) {
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if (isNull(cart))
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return mklist<value>(mklist<value>("entry", mklist<value>("title", string("Item")), mklist<value>("id", "0")));
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if (id == cadr<value>(caddr<value>(car(cart))))
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return mklist<value>(car(cart));
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return find(id, cdr(cart));
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}
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/**
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* Return items from the cart.
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*/
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const failable<value> get(const list<value>& id, const lvvlambda& cache) {
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if (isNull(id))
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return value(mklist<value>(append(mklist<value>("feed", mklist<value>("title", string("Your Cart")), mklist<value>("id", cartId)), getcart(cartId, cache))));
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return find(car(id), getcart(cartId, cache));
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}
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/**
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* Delete items from the cart.
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*/
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const failable<value> del(const list<value>& id, unused const lvvlambda& cache) {
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if (isNull(id))
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return cache(mklist<value>("delete", mklist<value>(cartId)));
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return trueValue;
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}
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/**
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* Return the price of an item.
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*/
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const double price(const list<value>& item) {
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return cadr<value>(assoc<value>("price", cdr<value>(cadr<value>(cadddr(item)))));
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}
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/**
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* Sum the prices of a list of items.
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*/
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const double sum(const list<value>& items) {
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if (isNull(items))
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return 0;
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return price(car(items)) + sum(cdr(items));
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}
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/**
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* Return the total price of the items in the cart.
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*/
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const failable<value> total(const lvvlambda& cache) {
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const list<value> cart(getcart(cartId, cache));
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return value(sum(cart));
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}
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}
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}
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extern "C" {
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const tuscany::value apply(const tuscany::list<tuscany::value>& params) {
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const tuscany::value func(car(params));
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if (func == "post")
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return tuscany::store::post(cadr(params), caddr(params), cadddr(params));
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if (func == "get")
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return tuscany::store::get(cadr(params), caddr(params));
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if (func == "delete")
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return tuscany::store::del(cadr(params), caddr(params));
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if (func == "total")
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return tuscany::store::total(cadr(params));
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return tuscany::mkfailure<tuscany::value>();
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}
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}
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