SpawnFieldInteractionType.java

package Roguelike.Fields.FieldInteractionTypes;

import java.util.HashMap;

import net.objecthunter.exp4j.Expression;
import net.objecthunter.exp4j.ExpressionBuilder;
import Roguelike.Fields.Field;

import com.badlogic.gdx.utils.XmlReader.Element;

import exp4j.Helpers.EquationHelper;

public class SpawnFieldInteractionType extends AbstractFieldInteractionType
{
	String fieldName;
	String stacksEqn;

	@Override
	public Field process(Field src, Field dst)
	{
		HashMap<String, Integer> variableMap = new HashMap<String, Integer>();

		variableMap.put("srcstacks", src.stacks);
		variableMap.put("dststacks", dst.stacks);

		int stacks = EquationHelper.evaluate( stacksEqn, variableMap );

		if (stacks == 0)
		{
			return null;
		}

		Field field = Field.load(fieldName);
		field.stacks = stacks;

		return field;
	}

	@Override
	public void parse(Element xml)
	{
		fieldName = xml.getText();
		stacksEqn = xml.getAttribute("Stacks", "1").toLowerCase();
	}

}