/*******************************************************************************
 * Breakout Cave Survey Visualizer
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * 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 2 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, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package org.andork.collect;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;

public class LineIterator extends EasyIterator<String> {
	private BufferedReader reader;

	public LineIterator(File file) {
		try {
			InputStream in = new FileInputStream(file);
			reader = new BufferedReader(new InputStreamReader(in));
		} catch (Exception ex) {

		}
	}

	public LineIterator(InputStream in) {
		try {
			reader = new BufferedReader(new InputStreamReader(in));
		} catch (Exception ex) {

		}
	}

	public LineIterator(Reader reader) {
		if (reader instanceof BufferedReader) {
			this.reader = (BufferedReader) reader;
		} else {
			try {
				this.reader = new BufferedReader(reader);
			} catch (Exception ex) {

			}
		}
	}

	public LineIterator(String file) {
		this(new File(file));
	}

	public LineIterator(URL url) {
		try {
			InputStream in = url.openStream();
			reader = new BufferedReader(new InputStreamReader(in));
		} catch (Exception ex) {

		}
	}

	@Override
	public void finalize() {
		try {
			reader.close();
		} catch (Exception ex) {

		}
		reader = null;
	}

	@Override
	protected String nextOrNull() {
		String result = null;
		if (reader != null) {
			try {
				result = reader.readLine();
			} catch (IOException e) {
			} finally {
				if (result == null) {
					finalize();
				}
			}
		}
		return result;
	}
}