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jCOLIBRI is a java framework for the development of Case-Based Reasoning systems.

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/**
 * NumericDirectProportionMethod.java
 * jCOLIBRI2 framework. 
 * @author Juan A. Recio-Garc�a.
 * GAIA - Group for Artificial Intelligence Applications
 * http://gaia.fdi.ucm.es
 * 09/01/2007
 */
package es.ucm.fdi.gaia.jcolibri.method.reuse;


import java.util.Collection;

import org.apache.log4j.LogManager;

import es.ucm.fdi.gaia.jcolibri.cbrcore.Attribute;
import es.ucm.fdi.gaia.jcolibri.cbrcore.CBRCase;
import es.ucm.fdi.gaia.jcolibri.cbrcore.CBRQuery;
import es.ucm.fdi.gaia.jcolibri.exception.AttributeAccessException;
import es.ucm.fdi.gaia.jcolibri.util.AttributeUtils;

/**
 * Computes the value of an attribute
 * related to a description attribute as proportional to the actual
 * values of these attributes in a retrieved case.
 * @author Juan A. Recio-Garcia
 *
 */
public class NumericDirectProportionMethod {

	/**
	 * This method computes the proportion of the values of a source attibute in a query and a case, and modifies the destination attribute in the case with that proportion.
	 */
	public static void directProportion(Attribute source, Attribute destination, CBRQuery query, Collection cases)
	{
		Object qs = AttributeUtils.findValue(source, query);
		if(qs == null)
			return;
		if(!(qs instanceof Number))
			return;
		
		Number qsn = (Number)qs;
		
		for(CBRCase c: cases)
		{
			try {
				Object cs = AttributeUtils.findValue(source, c);
				Object cdcomp = AttributeUtils.findBelongingComponent(destination, c);
				Object cd = destination.getValue(cdcomp);
				if((cs == null)||(cd == null))
					return;
				if(!(cs instanceof Number) || !(cd instanceof Number))
					return;
				
				Number csn = (Number)cs;
				Number cdn = (Number)cd;
				
				Double dres = (cdn.doubleValue() / csn.doubleValue()) * qsn.doubleValue();
				
				if(cd instanceof Double)
					destination.setValue(cdcomp, dres);
				else if(cd instanceof Integer)
					destination.setValue(cdcomp, new Integer(dres.intValue()));
				else if(cd instanceof Float)
					destination.setValue(cdcomp, new Float(dres.floatValue()));
				else if(cd instanceof Byte)
					destination.setValue(cdcomp, new Byte(dres.byteValue()));
				else if(cd instanceof Short)
					destination.setValue(cdcomp, new Short(dres.shortValue()));	
				
			} catch (AttributeAccessException e) {
				LogManager.getLogger(NumericDirectProportionMethod.class).error(e);
			}
			
			
			
		}
	}
}