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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) 2008-2014 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.pattern;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.xpath.XPathExpressionException;

import org.apache.commons.lang3.StringUtils;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import com.jaeksoft.searchlib.SearchLibException;
import com.jaeksoft.searchlib.crawler.web.database.pattern.PatternItem.Status;
import com.jaeksoft.searchlib.util.DomUtils;
import com.jaeksoft.searchlib.util.IOUtils;
import com.jaeksoft.searchlib.util.ReadWriteLock;
import com.jaeksoft.searchlib.util.XPathParser;
import com.jaeksoft.searchlib.util.XmlWriter;

public class PatternManager {

	final private ReadWriteLock rwl = new ReadWriteLock();

	private final Set patternSet;

	private final File patternFile;

	private PatternListMatcher patternListMatcher;

	public PatternManager(File indexDir, String filename)
			throws SearchLibException {
		patternFile = new File(indexDir, filename);
		patternSet = new TreeSet();
		patternListMatcher = null;
		try {
			load();
		} catch (ParserConfigurationException e) {
			throw new SearchLibException(e);
		} catch (SAXException e) {
			throw new SearchLibException(e);
		} catch (IOException e) {
			throw new SearchLibException(e);
		} catch (XPathExpressionException e) {
			throw new SearchLibException(e);
		} catch (URISyntaxException e) {
			throw new SearchLibException(e);
		}
	}

	private void load() throws ParserConfigurationException, SAXException,
			IOException, XPathExpressionException, SearchLibException,
			URISyntaxException {
		if (!patternFile.exists())
			return;
		XPathParser xpp = new XPathParser(patternFile);
		NodeList nodeList = xpp.getNodeList("/patterns/pattern");
		int l = nodeList.getLength();
		List patternList = new ArrayList(l);
		for (int i = 0; i < l; i++)
			patternList
					.add(new PatternItem(DomUtils.getText(nodeList.item(i))));
		addListWithoutStoreAndLock(patternList, true);
	}

	private void store() throws IOException, TransformerConfigurationException,
			SAXException {
		if (!patternFile.exists())
			patternFile.createNewFile();
		PrintWriter pw = new PrintWriter(patternFile);
		try {
			XmlWriter xmlWriter = new XmlWriter(pw, "UTF-8");
			xmlWriter.startElement("patterns");
			for (String pattern : patternSet) {
				xmlWriter.startElement("pattern");
				xmlWriter.textNode(pattern);
				xmlWriter.endElement();
			}
			xmlWriter.endElement();
			xmlWriter.endDocument();
		} finally {
			pw.close();
		}
	}

	private void addListWithoutStoreAndLock(List patternList,
			boolean bDeleteAll) throws SearchLibException,
			MalformedURLException, URISyntaxException {
		patternListMatcher = null;
		if (bDeleteAll)
			patternSet.clear();
		if (patternList == null)
			return;
		for (PatternItem item : patternList)
			addPatternWithoutLock(item);
	}

	public void addList(List patternList, boolean bDeleteAll)
			throws SearchLibException {
		rwl.w.lock();
		try {
			addListWithoutStoreAndLock(patternList, bDeleteAll);
			store();
		} catch (IOException e) {
			throw new SearchLibException(e);
		} catch (TransformerConfigurationException e) {
			throw new SearchLibException(e);
		} catch (SAXException e) {
			throw new SearchLibException(e);
		} catch (URISyntaxException e) {
			throw new SearchLibException(e);
		} finally {
			rwl.w.unlock();
		}
	}

	private int delPatternWithoutLock(String sPattern)
			throws MalformedURLException, URISyntaxException {
		if (sPattern == null)
			return 0;
		sPattern = sPattern.trim();
		if (!patternSet.remove(sPattern))
			return 0;
		patternListMatcher = null;
		return 1;
	}

	public int delPattern(Collection patterns)
			throws SearchLibException {
		rwl.w.lock();
		try {
			int count = 0;
			for (String pattern : patterns)
				count += delPatternWithoutLock(pattern);
			store();
			return count;
		} catch (MalformedURLException e) {
			throw new SearchLibException(e);
		} catch (TransformerConfigurationException e) {
			throw new SearchLibException(e);
		} catch (IOException e) {
			throw new SearchLibException(e);
		} catch (SAXException e) {
			throw new SearchLibException(e);
		} catch (URISyntaxException e) {
			throw new SearchLibException(e);
		} finally {
			rwl.w.unlock();
		}
	}

	public void delPatternItem(Collection patterns)
			throws SearchLibException {
		rwl.w.lock();
		try {
			for (String pattern : patterns)
				delPatternWithoutLock(pattern);
			store();
		} catch (MalformedURLException e) {
			throw new SearchLibException(e);
		} catch (TransformerConfigurationException e) {
			throw new SearchLibException(e);
		} catch (IOException e) {
			throw new SearchLibException(e);
		} catch (SAXException e) {
			throw new SearchLibException(e);
		} catch (URISyntaxException e) {
			throw new SearchLibException(e);
		} finally {
			rwl.w.unlock();
		}

	}

	private void addPatternWithoutLock(PatternItem patternItem)
			throws MalformedURLException, URISyntaxException {
		PatternMatcher matcher = patternItem.getMatcher();
		if (matcher == null) {
			patternItem.setStatus(Status.ERROR);
			return;
		}
		if (patternSet.add(matcher.sPattern)) {
			patternListMatcher = null;
			patternItem.setStatus(Status.INJECTED);
		} else
			patternItem.setStatus(Status.ALREADY);
	}

	public void addPattern(PatternItem patternItem) throws SearchLibException {
		rwl.w.lock();
		try {
			addPatternWithoutLock(patternItem);
			store();
		} catch (TransformerConfigurationException e) {
			throw new SearchLibException(e);
		} catch (IOException e) {
			throw new SearchLibException(e);
		} catch (SAXException e) {
			throw new SearchLibException(e);
		} catch (URISyntaxException e) {
			throw new SearchLibException(e);
		} finally {
			rwl.w.unlock();
		}
	}

	public int getPatterns(String startsWith, long start, long rows,
			List patternList) throws SearchLibException {
		rwl.r.lock();
		try {
			if (StringUtils.isEmpty(startsWith))
				startsWith = null;
			long end = start + rows;
			int pos = 0;
			int total = 0;
			for (String pattern : patternSet) {
				if (startsWith != null) {
					if (!pattern.startsWith(startsWith)) {
						pos++;
						continue;
					}
				}
				if (rows == 0 || pos < end) {
					if (pos >= start)
						patternList.add(pattern);
				}
				total++;
				pos++;
			}
			return total;
		} finally {
			rwl.r.unlock();
		}
	}

	public PatternListMatcher getPatternListMatcher() {
		rwl.r.lock();
		try {
			if (patternListMatcher != null)
				return patternListMatcher;
		} finally {
			rwl.r.unlock();
		}
		rwl.w.lock();
		try {
			if (patternListMatcher != null)
				return patternListMatcher;
			patternListMatcher = new PatternListMatcher(patternSet);
			return patternListMatcher;
		} finally {
			rwl.w.unlock();
		}
	}

	public int getPatterns(String startsWith, List patternList)
			throws SearchLibException {
		rwl.r.lock();
		try {
			if (StringUtils.isEmpty(startsWith))
				startsWith = null;
			int total = 0;
			for (String pattern : patternSet) {
				if (startsWith != null)
					if (!pattern.startsWith(startsWith))
						continue;
				patternList.add(pattern);
				total++;
			}
			return total;
		} finally {
			rwl.r.unlock();
		}
	}

	final private static void addLine(List list, String pattern) {
		pattern = pattern.trim();
		if (pattern.length() == 0)
			return;
		if (pattern.indexOf(':') == -1)
			pattern = "http://" + pattern;
		PatternItem item = new PatternItem();
		item.setPattern(pattern);
		list.add(item);
	}

	final private static void addLines(List list, String lines)
			throws IOException {
		if (lines == null)
			return;
		StringReader sr = null;
		BufferedReader br = null;
		try {
			sr = new StringReader(lines);
			br = new BufferedReader(sr);
			String line;
			while ((line = br.readLine()) != null)
				addLine(list, line);
		} finally {
			IOUtils.close(br, sr);
		}
	}

	public static List getPatternList(String pattern)
			throws IOException {
		List patternList = new ArrayList(0);
		addLines(patternList, pattern);
		return patternList;
	}

	public static List getPatternList(List patterns)
			throws IOException {
		List patternList = new ArrayList(0);
		if (patterns != null)
			for (String sPattern : patterns)
				addLines(patternList, sPattern);
		return patternList;
	}

	public static List getPatternList(BufferedReader reader)
			throws IOException {
		List patternList = new ArrayList();
		String line;
		while ((line = reader.readLine()) != null)
			addLine(patternList, line);
		return patternList;
	}

	public static String getStringPatternList(List patternList) {
		StringWriter sw = null;
		PrintWriter pw = null;
		try {
			sw = new StringWriter();
			pw = new PrintWriter(sw);
			for (PatternItem item : patternList)
				pw.println(item.getPattern());
			return sw.toString();
		} finally {
			if (pw != null)
				IOUtils.closeQuietly(pw);
			if (sw != null)
				IOUtils.closeQuietly(sw);
		}
	}

	public static final int countStatus(List patternList,
			PatternItem.Status status) {
		if (patternList == null)
			return 0;
		int count = 0;
		for (PatternItem patternItem : patternList)
			if (patternItem.getStatus() == status)
				count++;
		return count;
	}

}