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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 (car item) id (caddr 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)
+ (cons "Item" (list "0" (list)))
+ (if (= id (cadr (car cart)))
+ (car cart)
+ (find id (cdr cart))))
+)
+
+; Get items from the cart
+(define (get id cache)
+ (if (nul id)
+ (cons "Your Cart" (cons 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 (caddr 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 (gettotal cache)
+ (define cart (getcart cartId cache))
+ (sum cart)
+)
+
+; TODO remove these JSON-RPC specific functions
+(define (listMethods cache) (list "Service.gettotal"))