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OpenSearchServer is a powerful, enterprise-class, search engine program. Using the web user interface, the crawlers (web, file, database, ...) and the REST/RESTFul API you will be able to integrate quickly and easily advanced full-text search capabilities in your application. OpenSearchServer runs on Windows and Linux/Unix/BSD.

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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 2008-2013 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer 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.
 *
 * OpenSearchServer 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 OpenSearchServer. 
 *  If not, see .
 **/

package com.jaeksoft.searchlib.crawler.web.database;

import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.regex.Pattern;

import com.jaeksoft.searchlib.Logging;
import com.jaeksoft.searchlib.util.LinkUtils;
import com.jaeksoft.searchlib.util.StringUtils;

public class PatternItem {

	public enum Status {
		UNDEFINED("Undefined"), INJECTED("Injected"), ALREADY(
				"Already injected"), ERROR("Unknown Error");

		private String name;

		private Status(String name) {
			this.name = name;
		}

		@Override
		public String toString() {
			return name;
		}
	}

	private Status status;

	protected String sPattern;

	private Pattern pattern;

	private String topPrivateDomain;

	public PatternItem() {
		status = Status.UNDEFINED;
		sPattern = null;
		pattern = null;
		topPrivateDomain = null;
	}

	public PatternItem(URL url) {
		this();
		setPattern(url.toExternalForm());
	}

	public PatternItem(String sPattern) {
		this();
		setPattern(sPattern);
	}

	public Status getStatus() {
		return status;
	}

	public void setStatus(Status v) {
		status = v;
	}

	public boolean match(String sUrl) {
		if (pattern == null)
			return sUrl.equals(sPattern);
		return pattern.matcher(sUrl).matches();
	}

	public void setPattern(String s) {
		sPattern = s.trim();
		pattern = StringUtils.wildcardPattern(s);
		topPrivateDomain = null;
	}

	/**
	 * Return NULL if no valid URL can be extracted
	 * 
	 * @return
	 */
	public final URL tryExtractURL() {
		try {
			return LinkUtils.newEncodedURL(StringUtils.replace(sPattern, "*",
					""));
		} catch (MalformedURLException e) {
			Logging.warn("Unable to extract URL from " + sPattern);
			return null;
		} catch (URISyntaxException e) {
			Logging.warn("Unable to extract URL from " + sPattern);
			return null;
		}
	}

	public final static String getTopDomainOrHost(String host) {
		String[] part = StringUtils.split(host, '.');
		return part == null || part.length == 0 ? host : part[part.length - 1];
	}

	public String getTopDomainOrHost() throws MalformedURLException {
		if (topPrivateDomain != null)
			return topPrivateDomain;
		String host = new URL(StringUtils.replace(sPattern, "*", "a"))
				.getHost();
		topPrivateDomain = getTopDomainOrHost(host);
		return topPrivateDomain;
	}

	public String getPattern() {
		return sPattern;
	}

	public final static void main(String[] args) throws MalformedURLException {
		PatternItem item = new PatternItem("http://*.open-search-server.com/*");
		System.out.println(item.getTopDomainOrHost());
		System.out.println(item
				.match("http://www.open-search-server.com/download"));
		System.out.println(!item
				.match("http://open-search-server.com/download"));
		System.out.println(!item
				.match("https://www.open-search-server.com/download"));
		System.out.println(!item
				.match("https://www.open-search-server.com/download"));
	}
}