91 lines
2.2 KiB
Ruby
91 lines
2.2 KiB
Ruby
module Rubella
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# The Rubella::Storage holds the weighted data.
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# Storages can be added to get a timeline. But the Storage has no concrete
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# knowledge of time.
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# The Storage can have a defined length. If new data is added, it will drop
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# the oldest entries.
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#
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class Storage
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attr_reader :data
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# :length
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def initialize data, length = 0
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@data = data
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self.length = length
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end
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# Defines the length of the Storage.
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#
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# Be careful, if your Storage has more entries, tha the new length, the
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# oldest entries will immediately be dropped. If your Storage has less
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# entries, it will be filled up with empty entries.
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# Happens only if data has entries.
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#
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# Setting the length to 0 will disable this feature
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#
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# @param length Integer The size of the storage
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# @return Integer The new size
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#
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def length= length
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@length = length
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# Use length only, if length is valid
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if @length != 0 and self.length != 0
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# Drop entries, if more than new length
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while self.length > @length
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@data.pop
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end
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# Prefill with empty content, if less than new length
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dummy_data = Array.new(self.dataset_length, 0)
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while self.length < @length
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@data.unshift dummy_data
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end
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end
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@length
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end
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# Returns the current length of the storage.
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# (How many datasets it holds.)
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#
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# @return Integer length
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#
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def length
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@data.length
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end
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# Returns the length of a dataset.
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# Will return 0, if no datasets in storage.
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#
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# @return Integer length of one dataset
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#
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def dataset_length
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return 0 if self.length == 0
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return 1 unless @data[0].respond_to? "length"
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@data[0].length
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end
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# Adds the data from the given storage to the own data and return this as a
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# new Storage. Does not modify one of the storages.
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#
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# @param storage Rubella::Storage Storage with new data
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# @return Rubella::Storage
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#
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def add storage
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Storage.new (storage.data+@data), @length
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end
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# Passes each dataset through the given block.
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#
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# @param pointer to block
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#
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def each &block
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@data.each &block
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end
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end
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end
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