/*******************************************************************************
 * This file is part of logisim-evolution.
 *
 *   logisim-evolution 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.
 *
 *   logisim-evolution 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 logisim-evolution.  If not, see <http://www.gnu.org/licenses/>.
 *
 *   Original code by Carl Burch (http://www.cburch.com), 2011.
 *   Subsequent modifications by :
 *     + Haute École Spécialisée Bernoise
 *       http://www.bfh.ch
 *     + Haute École du paysage, d'ingénierie et d'architecture de Genève
 *       http://hepia.hesge.ch/
 *     + Haute École d'Ingénierie et de Gestion du Canton de Vaud
 *       http://www.heig-vd.ch/
 *   The project is currently maintained by :
 *     + REDS Institute - HEIG-VD
 *       Yverdon-les-Bains, Switzerland
 *       http://reds.heig-vd.ch
 *******************************************************************************/

package com.cburch.logisim.tools.key;

import java.util.HashMap;

import com.cburch.logisim.data.Attribute;

public class ParallelConfigurator implements KeyConfigurator, Cloneable {
	public static ParallelConfigurator create(KeyConfigurator a,
			KeyConfigurator b) {
		return new ParallelConfigurator(new KeyConfigurator[] { a, b });
	}

	public static ParallelConfigurator create(KeyConfigurator[] configs) {
		return new ParallelConfigurator(configs);
	}

	private KeyConfigurator[] handlers;

	private ParallelConfigurator(KeyConfigurator[] handlers) {
		this.handlers = handlers;
	}

	@Override
	public ParallelConfigurator clone() {
		ParallelConfigurator ret;
		try {
			ret = (ParallelConfigurator) super.clone();
		} catch (CloneNotSupportedException e) {
			e.printStackTrace();
			return null;
		}
		int len = this.handlers.length;
		ret.handlers = new KeyConfigurator[len];
		for (int i = 0; i < len; i++) {
			ret.handlers[i] = this.handlers[i].clone();
		}
		return ret;
	}

	public KeyConfigurationResult keyEventReceived(KeyConfigurationEvent event) {
		KeyConfigurator[] hs = handlers;
		if (event.isConsumed()) {
			return null;
		}
		KeyConfigurationResult first = null;
		HashMap<Attribute<?>, Object> map = null;
		for (int i = 0; i < hs.length; i++) {
			KeyConfigurationResult result = hs[i].keyEventReceived(event);
			if (result != null) {
				if (first == null) {
					first = result;
				} else if (map == null) {
					map = new HashMap<Attribute<?>, Object>(
							first.getAttributeValues());
					map.putAll(result.getAttributeValues());
				} else {
					map.putAll(result.getAttributeValues());
				}
			}
		}
		if (map != null) {
			return new KeyConfigurationResult(event, map);
		} else {
			return first;
		}
	}
}