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Re: [science-iwg] Making your own Dataset 
FYI I am changing the operations UI to add categories. This work might not be finished until early next week.
________________________________________
From: Matt.Gerring@xxxxxxxxxxxxx [Matt.Gerring@xxxxxxxxxxxxx]
Sent: 29 October 2014 12:35
To: science-iwg@xxxxxxxxxxx
Subject: [science-iwg] Making your own Dataset

Hi Vincent,

Making your own IDataset is a lot easier than implementing the IDataset interface, if as you say, you already have a lazy data object.

What you do is you use the class org.eclipse.dawnsci.analysis.dataset.impl.LazyDataset and provide it with an ILazyLoader. This loader could interface with your existing lazy dataset implementation, getting for instance double[].

Once you have your primitive array, there is a constructor for DoubleDataset (and for all other primitives, IntegerDataset etc.). The external code would then look like:

YourLazyDataObject lo = ...
ILazyLoader loader = new ILazyLoader() {
    ...
    public IDataset getDataset(IMonitor mon, int[] shape, int[] start, int[] stop, int[] step) throws Exception {
        // process the slice information using lo
        // end up with a double[], da
        return new DoubleDataset(da, ...)
    }
};
ILazyDataset lazy = new LazyDataset("data de Vincent:)", Dataset.FLOAT, size, shape, loader);

// Now you can slice these data with ISliceSystem (or slicing using the example code) and use them with the plotting IPlottingSystem - voila!


Matt

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Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd.
Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message.
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