NumericRangeCalculator.java

/*
 * NumericRangeCalculator.java
 *
 * Created on Sep 13, 2007, 12:14:01 PM
 *
 */

package edu.wustl.asl.gs.common;

import edu.wustl.asl.utils.NumericRange;
import java.util.Map;

/**
 *
 * @author erik
 */
public class NumericRangeCalculator<T extends Number & Comparable<? super T>> implements SensorStatusCalculator<T> {
    // For every class T that extends Number and is comparable to itself or one of its decendents

    protected Map<NumericRange<T>, SensorStatus> rules;
    protected SensorStatus defaultState;

    public NumericRangeCalculator(Map<NumericRange<T>, SensorStatus> rules, SensorStatus defaultState) {
        this.rules = rules;
        this.defaultState = defaultState;
    }

    public SensorStatus calculateStatus(SensorValue<? extends T> val) {
        for (Map.Entry<NumericRange<T>, SensorStatus> rule : rules.entrySet()) {
            NumericRange<T> range = rule.getKey();
            SensorStatus status = rule.getValue();

            if (range.getLowerBound().compareTo(val.getData()) >= 0 && range.getUpperBound().compareTo(val.getData()) <= 0) {
                return status;
            }
        }
        return defaultState;
    }
}

I wrote this back in college. The program was designed to read values from sensors and determine a status (nominal, warning, error, critical error). That's really not the important part.

What is important is the class declaration. Justification: Number is not Comparable...

I originally committed it without the comment, I was severely chastised :)