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Generic Evolver utility classes
There is a newer version: 3.5.0
package fi.evolver.utils;

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class UriUtils {

	public static Optional getQueryParameter(URI uri, String attributeName)  {
		return getParameter(uri.getRawQuery(), attributeName);
	}

	public static Optional getFragmentParameter(URI uri, String attributeName)  {
		return getParameter(uri.getRawFragment(), attributeName);
	}


	public static Optional getParameter(String data, String attributeName)  {
		if (data == null)
			return Optional.empty();

		Pattern pattern = Pattern.compile("(?:^|&)" + attributeName + "=([^&]*)");
		Matcher matcher = pattern.matcher(data);
		if (matcher.find()) {
			try {
				return Optional.of(URLDecoder.decode(matcher.group(1), "UTF-8"));
			}
			catch (UnsupportedEncodingException e) {
				throw new IllegalStateException("BUG! UTF-8 not supported?", e);
			}
		}

		return Optional.empty();
	}


	public static String getUserName(URL url) {
		return parseUserInfo(url.getUserInfo())[0];
	}

	public static String getUserName(URI uri) {
		return parseUserInfo(uri.getUserInfo())[0];
	}


	public static String getPassword(URL url) {
		return parseUserInfo(url.getUserInfo())[1];
	}

	public static String getPassword(URI uri) {
		return parseUserInfo(uri.getUserInfo())[1];
	}


	private static String[] parseUserInfo(String userInfo) {
		if (userInfo == null)
			return new String[2];

		if (userInfo.contains(":"))
			return userInfo.split(":", 2);
		else
			return new String[] { userInfo, null };
	}



	public static URI create(String protocol, String username, String password, String host, String path) throws URISyntaxException {
		return create(protocol, username, password, host, path, null, null);
	}


	public static URI create(String protocol, String username, String password, String host, String path, String query, String fragment) throws URISyntaxException {
		if (protocol == null || host == null || path == null)
			throw new IllegalArgumentException(String.format("FAILED creating URI due to missing information. protocol:%s, host:%s, path:%s", protocol, host, path));

		String userInfo = "";
		if (username != null)
			userInfo = username;
		if (password != null)
			userInfo += ':' + password;

		int pivot = host.indexOf(':');
		String hostName = host;
		int port = -1;
		if (pivot >= 0) {
			port = Integer.parseInt(host.substring(pivot + 1));
			hostName = host.substring(0, pivot);
		}

		return new URI(protocol, userInfo, hostName, port, path, query, fragment);
	}


	public static String encode(String value) {
		try {
			String result = URLEncoder.encode(value.replace("+", "PLUSSIGN"), "UTF-8");
			return result.replace("+", "%20").replace("PLUSSIGN", "+");
		}
		catch (UnsupportedEncodingException e) {
			return null;
		}
	}

}