From c9bfccc35345ce58fb5774d4b0b6a9868b262c0a Mon Sep 17 00:00:00 2001
From: giorgio <giorgio@13f79535-47bb-0310-9956-ffa450edef68>
Date: Wed, 5 Sep 2012 08:31:30 +0000
Subject: git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1381061
 13f79535-47bb-0310-9956-ffa450edef68

---
 .../samples/store-cpp/shopping-cart.cpp            | 135 +++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 sca-cpp/branches/lightweight-sca/samples/store-cpp/shopping-cart.cpp

(limited to 'sca-cpp/branches/lightweight-sca/samples/store-cpp/shopping-cart.cpp')

diff --git a/sca-cpp/branches/lightweight-sca/samples/store-cpp/shopping-cart.cpp b/sca-cpp/branches/lightweight-sca/samples/store-cpp/shopping-cart.cpp
new file mode 100644
index 0000000000..2771d7cd9c
--- /dev/null
+++ b/sca-cpp/branches/lightweight-sca/samples/store-cpp/shopping-cart.cpp
@@ -0,0 +1,135 @@
+/*
+ * 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 lambda<value(const list<value>&)>& 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(list<value>());
+    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 lambda<value(const list<value>&)>& 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 lambda<value(const list<value>&)>& 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 lambda<value(const list<value>&)>& cache) {
+    if (isNil(id))
+        return cache(mklist<value>("delete", mklist<value>(cartId)));
+    return value(true);
+}
+
+/**
+ * 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 lambda<value(const list<value>&)>& 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>();
+}
+
+}
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