cc.recommenders.evaluation.data.Averager.java Source code

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Here is the source code for cc.recommenders.evaluation.data.Averager.java

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/**
 * Copyright (c) 2011-2013 Darmstadt University of Technology.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Sebastian Proksch - initial API and implementation
 */
package cc.recommenders.evaluation.data;

import java.util.List;

import org.apache.commons.math.util.MathUtils;

import cc.recommenders.assertions.Asserts;

import com.google.common.collect.Lists;

public class Averager {

    private List<Double> data = Lists.newLinkedList();

    public void reinit() {
        data.clear();
    }

    public boolean hasValues() {
        return !data.isEmpty();
    }

    public void add(double value) {
        data.add(value);
    }

    public double getAverage() {
        Asserts.assertFalse(data.isEmpty());

        double avg = 0.0;
        for (Double v : data) {
            avg += v;
        }
        avg = avg / data.size();

        return avg;
    }

    public double getRoundedAverage(int scale) {
        return MathUtils.round(getAverage(), scale);
    }

    public int getIntAverage() {
        return (int) Math.round(getAverage());
    }
}