157ca678de
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1428191 13f79535-47bb-0310-9956-ffa450edef68
82 lines
2.2 KiB
Scheme
82 lines
2.2 KiB
Scheme
; 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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; Shopping cart implementation
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(define cartId "1234")
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; Get the shopping cart from the cache
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; Return an empty cart if not found
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(define (getcart id cache)
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(define cart (cache "get" (list id)))
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(if (null? cart)
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(list)
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cart)
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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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(define (post collection item cache)
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(define id (uuid))
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(define newItem (list 'entry (cadr (car item)) (list 'id id) (cadddr (car item))))
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(define cart (cons newItem (getcart cartId cache)))
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(cache "put" (list cartId) cart)
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(list id)
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)
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; Find an item in the cart
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(define (find id cart)
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(if (null? cart)
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(list (list 'entry (list 'title "Item") (list 'id "0")))
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(if (= id (cadr (caddr (car cart))))
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(list (car cart))
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(find id (cdr cart))))
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)
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; Get items from the cart
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(define (get id cache)
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(if (null? id)
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(list (append (list 'feed (list 'title "Your Cart") (list 'id cartId)) (getcart cartId cache)))
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(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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(define (delete id cache)
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(if (null? id)
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(cache "delete" (list cartId))
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true
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)
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)
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; Return the price of an item
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(define (price item)
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(cadr (assoc 'price (cadr (cadddr item))))
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)
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; Sum the prices of a list of items
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(define (sum items)
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(if (null? items)
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0
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(+ (price (car items)) (sum (cdr items))))
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)
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; Return the total price of the items in the cart
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(define (total cache)
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(define cart (getcart cartId cache))
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(sum cart)
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)
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