VariableNumber.java

/**
 * BetonQuest - advanced quests for Bukkit
 * Copyright (C) 2016  Jakub "Co0sh" Sapalski
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package pl.betoncraft.betonquest;

import pl.betoncraft.betonquest.api.Variable;
import pl.betoncraft.betonquest.config.Config;
import pl.betoncraft.betonquest.utils.Debug;

/**
 * Represents a number which might also be a variable.
 * 
 * @author Jakub Sapalski
 */
public class VariableNumber {

	private double number;
	private Variable variable;

	/**
	 * Parses the string as a number or saves it as a variable if it's not a
	 * number.
	 * 
	 * @param packName
	 *            the package in which the variable is defined
	 * @param variable
	 *            the string to parse
	 */
	public VariableNumber(String packName, String variable) throws NumberFormatException {
		if (variable.length() > 2 && variable.startsWith("%") && variable.endsWith("%")) {
			try {
				this.variable = BetonQuest.createVariable(Config.getPackages().get(packName), variable);
			} catch (InstructionParseException e) {
				throw new NumberFormatException("Could not create variable: " + e.getMessage());
			}
			if (this.variable == null) {
				throw new NumberFormatException("Could not create variable");
			}
		} else {
			number = Double.parseDouble(variable);
		}
	}

	/**
	 * Creates the VariableNumber using specified number.
	 * 
	 * @param number
	 *            the number to use
	 */
	public VariableNumber(int number) {
		this.number = number;
	}

	/**
	 * Creates the VariableNumber using specified number.
	 * 
	 * @param number
	 *            the number to use
	 */
	public VariableNumber(double number) {
		this.number = number;
	}

	/**
	 * Returns an integer represented by this variable. If it's a double, this
	 * method will return the floor of it.
	 * 
	 * @param playerID
	 *            ID of the player for whom the variable should be resolved
	 * @return the integer represented by this variable number
	 * @throws QuestRuntimeException when the variable does not resolve to a number
	 */
	public int getInt(String playerID) throws QuestRuntimeException {
		return (int) Math.floor(resolveVariable(playerID));
	}

	/**
	 * Returns a double represented by this variable.
	 * 
	 * @param playerID
	 *            ID of the player for whom the variable should be resolved
	 * @return the double represented by this variable number
	 * @throws QuestRuntimeException when the variable does not resolve to a number
	 */
	public double getDouble(String playerID) throws QuestRuntimeException {
		return resolveVariable(playerID);
	}

	private double resolveVariable(String playerID) throws QuestRuntimeException {
		if (variable == null) {
			return number;
		} else if (playerID == null) {
			return 0;
		} else {
			String resolved = variable.getValue(playerID);
			double parsed = 0;
			try {
				parsed = Double.parseDouble(resolved);
			} catch (NumberFormatException e) {
				Debug.error("Could not parse the as a number, it's value is: '" + resolved + "'; returning 0.");
			}
			return parsed;
		}
	}

}