info.archinnov.achilles.composite.ComponentEqualityCalculator Maven / Gradle / Ivy

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package info.archinnov.achilles.composite;

import static me.prettyprint.hector.api.beans.AbstractComposite.ComponentEquality.*;
import info.archinnov.achilles.type.BoundingMode;
import info.archinnov.achilles.type.OrderingMode;
import me.prettyprint.hector.api.beans.AbstractComposite.ComponentEquality;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * ComponentEqualityCalculator
 * 
 * @author DuyHai DOAN
 * 
 */
public class ComponentEqualityCalculator
{
	private static final Logger log = LoggerFactory.getLogger(ComponentEqualityCalculator.class);

	public ComponentEquality[] determineEquality(BoundingMode bounds,
			OrderingMode ordering)
	{
		log
				.trace("Determine component equality with respect to bounding mode {} and ordering mode {}",
						bounds.name(), ordering.name());
		ComponentEquality[] result = new ComponentEquality[2];
		switch (ordering)
		{
			case ASCENDING:
				switch (bounds)
				{
					case INCLUSIVE_BOUNDS:
						result[0] = EQUAL;
						result[1] = GREATER_THAN_EQUAL;
						break;
					case EXCLUSIVE_BOUNDS:
						result[0] = GREATER_THAN_EQUAL;
						result[1] = LESS_THAN_EQUAL;
						break;
					case INCLUSIVE_START_BOUND_ONLY:
						result[0] = EQUAL;
						result[1] = LESS_THAN_EQUAL;
						break;
					case INCLUSIVE_END_BOUND_ONLY:
						result[0] = GREATER_THAN_EQUAL;
						result[1] = GREATER_THAN_EQUAL;
						break;
				}
				break;
			case DESCENDING:
				switch (bounds)
				{
					case INCLUSIVE_BOUNDS:
						result[0] = GREATER_THAN_EQUAL;
						result[1] = EQUAL;
						break;
					case EXCLUSIVE_BOUNDS:
						result[0] = LESS_THAN_EQUAL;
						result[1] = GREATER_THAN_EQUAL;
						break;
					case INCLUSIVE_START_BOUND_ONLY:
						result[0] = GREATER_THAN_EQUAL;
						result[1] = GREATER_THAN_EQUAL;
						break;
					case INCLUSIVE_END_BOUND_ONLY:
						result[0] = LESS_THAN_EQUAL;
						result[1] = EQUAL;
						break;
				}
				break;
		}

		log
				.trace("For the to bounding mode {} and ordering mode {}, the component equalities should be : {} - {}",
						bounds.name(), ordering.name(), result[0].name(), result[1].name());
		return result;
	}
}