@@ -0,0 +1,363 @@
+package de.jeha.s3pt.operations;%0A%0Aimport org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;%0A%0A/**%0A * @author jenshadlich@googlemail.com%0A */%0Apublic abstract class AbstractOperation %7B%0A%0A    private DescriptiveStatistics statistics = new DescriptiveStatistics();%0A%0A    protected DescriptiveStatistics getStatistics() %7B%0A        return statistics;%0A    %7D%0A%0A%7D%0A

introduce abstract operation