package parameterrules;

import java.io.*;
import java.lang.Math;
import main.BetterTokenizer;
import main.GeneralInput;
import main.MoreMath;
import parameters.ParameterSet;

/** Implements the manipulation the Parameter's value is multiplied by a constant before
	being used in a model.
*/
public class MultiplyParameterRule extends ParameterRule	{
		/** The number of the parameter */
	private int			param_index = -1;
		/** The multiplier */
	private float		multiplier = 1;
	
	MultiplyParameterRule() {}
	
	public ParameterRule copy() {
		MultiplyParameterRule pr = (MultiplyParameterRule)super.copy();
		return pr;
	}
	
	public float getFuzzyScore(float [] params)	
	{
		return 0;
	}
	
	protected void loadParameter(String info, BetterTokenizer tokenizer) throws Exception	{
		if(info.equals("Param"))	
		{
			GeneralInput.nextToken(tokenizer);
			param_index = refParams.getPosition(tokenizer.sval);
		}	
		else if(info.equals("Multiplier"))	
		{
			GeneralInput.nextToken(tokenizer);
			multiplier = (float)tokenizer.nval;
		}
		else super.loadParameter(info, tokenizer);
	}

	public boolean changeParameters(float [] params, int mode, ParameterSet set) 
	{
		params[param_index] = multiplier * params[param_index];
		return true;
	}
}