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A Functional Reactive Programming (FRP) system for Java

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package nz.sodium;

class LazyCell extends Cell {
    LazyCell(final Stream event, final Lazy lazyInitValue) {
        super(event, null);
        this.lazyInitValue = lazyInitValue;
    }

    @Override
    A sampleNoTrans()
    {
        if (value == null && lazyInitValue != null) {
            value = lazyInitValue.get();
            lazyInitValue = null;
        }
        return value;
    }
}