git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1381061 13f79535-47bb-0310-9956-ffa450edef68

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diff --git a/sca-cpp/branches/lightweight-sca/samples/store-scheme/shopping-cart.scm b/sca-cpp/branches/lightweight-sca/samples/store-scheme/shopping-cart.scm
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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.
+
+; Shopping cart implementation
+
+(define cartId "1234")
+
+; Get the shopping cart from the cache
+; Return an empty cart if not found
+(define (getcart id cache)
+  (define cart (cache "get" (list id)))
+  (if (nul cart)
+    (list)
+    cart)
+)
+
+; Post a new item to the cart, create a new cart if necessary
+(define (post collection item cache)
+  (define id (uuid))
+  (define newItem (list 'entry (cadr (car item)) (list 'id id) (cadddr (car item))))
+  (define cart (cons newItem (getcart cartId cache)))
+  (cache "put" (list cartId) cart)
+  (list id)
+)
+
+; Find an item in the cart
+(define (find id cart)
+  (if (nul cart)
+    (list (list 'entry (list 'title "Item") (list 'id "0")))
+    (if (= id (cadr (caddr (car cart))))
+      (list (car cart))
+      (find id (cdr cart))))
+)
+
+; Get items from the cart
+(define (get id cache)
+  (if (nul id)
+    (list (append (list 'feed (list 'title "Your Cart") (list 'id cartId)) (getcart cartId cache)))
+    (find (car id) (getcart cartId cache))
+  )
+)
+
+; Delete items from the  cart
+(define (delete id cache)
+  (if (nul id)
+    (cache "delete" (list cartId))
+    true
+  )
+)
+
+; Return the price of an item
+(define (price item)
+  (cadr (assoc 'price (cadr (cadddr item))))
+)
+
+; Sum the prices of a list of items
+(define (sum items)
+  (if (nul items)
+    0
+    (+ (price (car items)) (sum (cdr items))))
+)
+
+; Return the total price of the items in the cart
+(define (total cache)
+  (define cart (getcart cartId cache))
+  (sum cart)
+)
+