StringUtil.java

/*
 * Copyright (c) 2014-2016 Jan Strauß <jan[at]over9000.eu>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package eu.over9000.skadi.util;

import eu.over9000.skadi.model.Channel;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringUtil {
	public static final String USERNAME_REGEX = "\\w{2,25}";
	private static final long SIZE_KB = 1024;
	private static final long SIZE_MB = SIZE_KB * SIZE_KB;
	private static final long SIZE_GB = SIZE_KB * SIZE_MB;
	private static final Pattern urlPattern = Pattern.compile("http(s)*://(www\\.)*twitch\\.tv/(" + USERNAME_REGEX + ")(/.*)?");

	public static boolean containsIgnoreCase(final List<String> list, final String lookup) {
		for (final String current : list) {
			if (current.equalsIgnoreCase(lookup)) {
				return true;
			}
		}
		return false;
	}

	public static String extractUsernameFromURL(final String url) {
		final Matcher urlMatcher = urlPattern.matcher(url);

		if (urlMatcher.matches()) {
			return urlMatcher.group(3);
		}

		return null;
	}

	public static String toStreamURL(final Channel channel) {
		return "http://www.twitch.tv/" + channel.getName() + "/";
	}

	public static String toReadableFileSize(final long size) {
		final String result;
		if (size / SIZE_GB > 0) {
			result = String.valueOf(size / SIZE_GB) + " GB";
		} else if (size / SIZE_MB > 0) {
			result = String.valueOf(size / SIZE_MB) + " MB";
		} else if (size / SIZE_KB > 0) {
			result = String.valueOf(size / SIZE_KB) + " KB";
		} else {
			result = String.valueOf(size) + " bytes";
		}
		return result;
	}
}