/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.operator.learner.associations.gsp;

import java.util.ArrayList;
import java.util.Collections;

/**
 * @author Sebastian Land
 *
 */
public class Transaction extends ArrayList<Item> {

	private static final long serialVersionUID = 8725134393133916536L;

	private double time;
	
	public Transaction(double time, Item...items) {
		this.time = time;
		for(Item item: items)
			super.add(item);
		Collections.sort(this);
	}
	
	public Transaction(Transaction transaction) {
		this.addAll(transaction);
	}
	
	public Item getLastItem() {
		return get(size() - 1);
	}

	public double getTime() {
		return time;
	}

	@Override
	public boolean add(Item item) {
		if (!contains(item)) {
			super.add(item);
			Collections.sort(this);
		}
		return true;
	}
	
	@Override
	public String toString() {
		StringBuffer buffer = new StringBuffer();
		String separator = "";
		for (Item item: this) {
			buffer.append(separator + item.toString());
			separator = ", ";
		}
		return buffer.toString();
	}
}