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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.
# stores collection implementation
from util import *
# Convert a particular store tag to a store id
def storeid(tag):
return ("store", tag, "store.apps")
# Get a store from the cache
def getstore(id, cache):
val = cache.get(id)
if isNil(val) or val is None:
return ()
return cdddr(car(val))
# Put a store into the cache
def putstore(id, store, cache):
val = ((("'feed", ("'title", "App Store"), ("'id", cadr(id))) + store),)
# Put an app into a store
def put(key, app, cache):
def putapp(app, store):
if isNil(store):
return app
if cadr(caddr(car(app))) == cadr(caddr(car(store))):
return cons(car(app), cdr(store))
return cons(car(store), putapp(app, cdr(store)))
tag = car(key)
store = putapp(app, getstore(storeid(tag), cache))
putstore(storeid(tag), store, cache)
return True
# Get apps from a store
def get(key, cache):
tag = car(key)
id = cdr(key)
def findapp(id, store):
if isNil(store):
return None
if car(id) == cadr(caddr(car(store))):
return (car(store),)
return findapp(id, cdr(store))
if isNil(id):
return ((("'feed", ("'title", "App Store"), ("'id", tag)) + getstore(storeid(tag), cache)),)
return findapp(id, getstore(storeid(tag), cache))
# Delete apps from a store
def delete(key, cache):
tag = car(key)
id = cdr(key)
if isNil(id):
return cache.delete(storeid(tag))
def deleteapp(id, store):
if isNil(store):
return ()
if car(id) == cadr(caddr(car(store))):
return cdr(store)
return cons(car(store), deleteapp(id, cdr(store)))
store = deleteapp(id, getstore(storeid(tag), cache))
putstore(storeid(tag), store, cache)
return True
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