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angular.module('News').factory '_Cache', ->
class Cache
constructor: (@feedType, @feedModel, @folderModel) ->
@clear()
clear: ->
@feedCache = []
@folderCache = {}
@folderCacheLastModified = 0
@importantCache = []
@highestId = 0
@lowestId = 0
@highestTimestamp = 0
@lowestTimestamp = 0
@highestIds = {}
@lowestIds = {}
@highestTimestamps = {}
@lowestTimestamps = {}
add: (item) ->
# cache for feed access
if not @feedCache[item.feedId]
@feedCache[item.feedId] = []
@feedCache[item.feedId].push(item)
# cache for non feeds
if @highestTimestamp < item.date
@highestTimestamp = item.date
if @lowestTimestamp > item.date
@lowestTimestamp = item.date
if @highestId < item.id
@highestId = item.id
if @lowestId > item.id
@lowestId = item.id
# cache for important
if item.isImportant
@importantCache.push(item)
# cache lowest and highest ids and timestamps for only fetching new
# items
if @highestTimestamps[item.feedId] == undefined or item.id > @highestTimestamps[item.feedId]
@highestTimestamps[item.feedId] = item.date
if @lowestTimestamps[item.feedId] == undefined or item.id > @lowestTimestamps[item.feedId]
@lowestTimestamps[item.feedId] = item.date
if @highestIds[item.feedId] == undefined or item.id > @highestIds[item.feedId]
@highestIds[item.feedId] = item.id
if @lowestIds[item.feedId] == undefined or item.id > @lowestIds[item.feedId]
@lowestIds[item.feedId] = item.id
getItemsOfFeed: (feedId) ->
return @feedCache[feedId]
getFeedIdsOfFolder: (folderId) ->
@buildFolderCache(folderId)
return @folderCache[folderId]
getImportantItems: ->
return @importantCache
buildFolderCache: (id) ->
# invalidate the foldercache if the last modified date is
# not the currently used one
if @folderCacheLastModified != @feedModel.getLastModified()
@folderCache = {}
@folderCacheLastModified = @feedModel.getLastModified()
# if the folderarray does not yet exist, build it
# otherwise use the last generated one
if @folderCache[id] == undefined
@folderCache[id] = []
for feed in @feedModel.getItems()
if feed.folderId == id
@folderCache[id].push(feed.id)
getFeedsOfFolderId: (id) ->
@buildFolderCache(id)
return @folderCache[id]
removeItemInArray: (id, array) ->
removeItemIndex = null
counter = 0
for element in array
if element.id == id
removeItemIndex = counter
break
counter += 1
if removeItemIndex != null
array.splice(removeItemIndex, 1)
remove: (item) ->
@removeItemInArray(item.id, @feedCache[item.feedId])
@removeItemInArray(item.id, @importantCache)
setImportant: (item, isImportant) ->
if isImportant
@importantCache.push(item)
else
@removeItemInArray(item.id, @importantCache)
getHighestId: (type, id) ->
if @isFeed(type)
return @highestIds[id] || 0
else
return @highestId
getHighestTimestamp: (type, id) ->
if @isFeed(type)
return @highestTimestamps[id] || 0
else
return @highestTimestamp
getLowestId: (type, id) ->
if @isFeed(type)
return @lowestIds[id] || 0
else
return @lowestId
getLowestTimestamp: (type, id) ->
if @isFeed(type)
return @lowestTimestamps[id] || 0
else
return @lowestTimestamp
isFeed: (type) ->
return type == @feedType.Feed
return Cache
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