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A set of mathematical utilities

There is a newer version: 1.0.4

package com.cogpunk.math.probability;

import java.util.List;

import com.cogpunk.math.NumberOperator;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.EqualsBuilder;

/**
 * Strategy for multiplying all of the events together 
 */
public class EventProbabilityProfileMultiplicationAggregationStrategy
		implements EventProbabilityProfileAggregationStrategy {
	
	private NumberOperator numberOperator;
	
	/**
	 * @param numberOperator suitable for manipulating the events
	 */
	public EventProbabilityProfileMultiplicationAggregationStrategy(NumberOperator numberOperator) {
		this.numberOperator = numberOperator;
	}
	
	
	/**
	 * 
	 * 
	 * @param results  The events to be multipled together
	 * @return All of the supplied events multpled together
	 */
	@Override
	public E aggregate(List results) {
		
		E total = null;
		
		for (E r : results)  {
			if (total == null) {
				total = r;
			} else {
				total = numberOperator.multiply(total, r);
			}
		}
		
		if (total == null) {
			total = numberOperator.cast(1);
		}
		
		return total;
		
		
	}


	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean equals(final Object other) {
		if (!(other instanceof EventProbabilityProfileMultiplicationAggregationStrategy)) {
			return false;
		}
		EventProbabilityProfileMultiplicationAggregationStrategy castOther = (EventProbabilityProfileMultiplicationAggregationStrategy) other;
		return new EqualsBuilder().append(numberOperator, castOther.numberOperator).isEquals();
	}


	/**
	 * {@inheritDoc}
	 */
	@Override
	public int hashCode() {
		return new HashCodeBuilder().append(numberOperator).toHashCode();
	}

}