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48 lines
1.3 KiB
CoffeeScript
48 lines
1.3 KiB
CoffeeScript
#
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# We can insert data into the PreloadStore when the document is loaded.
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# The data can be accessed once by a key, after which it is removed.
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#
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window.PreloadStore =
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data: {}
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store: (key, value) ->
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@data[key] = value
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# To retrieve a key, you provide the key you want, plus a finder to
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# load it if the key cannot be found. Once the key is used once, it is
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# removed from the store. So, for example, you can't load a preloaded topic
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# more than once.
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get: (key, finder) ->
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promise = new RSVP.Promise
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if @data[key]
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promise.resolve(@data[key])
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delete @data[key]
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else
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if finder
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result = finder()
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# If the finder returns a promise, we support that too
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if result.then
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result.then (result) ->
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promise.resolve(result)
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, (result) -> promise.reject(result)
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else
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promise.resolve(result)
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else
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promise.resolve(undefined)
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promise
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# Does the store contain a particular key? Does not delete, just returns
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# true or false.
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contains: (key) -> @data[key] isnt undefined
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# If we are sure it's preloaded, we don't have to supply a finder. Just
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# returns undefined if it's not in the store.
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getStatic: (key) ->
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result = @data[key]
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delete @data[key]
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result
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