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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) 2010-2013 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;

import com.jaeksoft.searchlib.crawler.web.browser.BrowserDriverEnum;
import com.jaeksoft.searchlib.util.FileUtils;
import com.jaeksoft.searchlib.util.properties.PropertyItem;
import com.jaeksoft.searchlib.util.properties.PropertyItemListener;
import com.jaeksoft.searchlib.util.properties.PropertyManager;
import com.jaeksoft.searchlib.web.StartStopListener;
import org.apache.lucene.search.BooleanQuery;
import org.xml.sax.SAXException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPathExpressionException;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;

public class ClientFactory implements PropertyItemListener {

	public static ClientFactory INSTANCE = null;

	public final InstanceProperties properties;

	private PropertyItem booleanQueryMaxClauseCount;

	private PropertyItem defaultWebBrowserDriver;

	private PropertyItem soapActive;

	private PropertyItem externalParser;

	private PropertyItem logFullTrace;

	private PropertyItem smtpHostname;

	private PropertyItem smtpPort;

	private PropertyItem smtpUseSsl;

	private PropertyItem smtpUseTls;

	private PropertyItem smtpSenderEmail;

	private PropertyItem smtpSenderName;

	private PropertyItem smtpUsername;

	private PropertyItem smtpPassword;

	private PropertyItem schedulerThreadPoolSize;

	private PropertyItem clusterInstanceId;

	private PropertyManager advancedProperties;

	public ClientFactory() throws SearchLibException {
		try {
			properties =
					new InstanceProperties(new File(StartStopListener.OPENSEARCHSERVER_DATA_FILE, "properties.xml"));
			File advPropFile = new File(StartStopListener.OPENSEARCHSERVER_DATA_FILE, "advanced.xml");
			advancedProperties = new PropertyManager(advPropFile);
			booleanQueryMaxClauseCount =
					advancedProperties.newIntegerProperty("booleanQueryMaxClauseCount", 1024, null, null);
			hasBeenSet(booleanQueryMaxClauseCount);
			booleanQueryMaxClauseCount.addListener(this);
			defaultWebBrowserDriver = advancedProperties
					.newStringProperty("defaultWebBrowserDriver", BrowserDriverEnum.FIREFOX.getName());
			defaultWebBrowserDriver.addListener(this);
			soapActive = advancedProperties.newBooleanProperty("soapActive", false);
			soapActive.addListener(this);
			externalParser = advancedProperties.newBooleanProperty("externalParser", false);
			externalParser.addListener(this);
			logFullTrace = advancedProperties.newBooleanProperty("logFullTrace", false);
			hasBeenSet(logFullTrace);
			logFullTrace.addListener(this);
			smtpHostname = advancedProperties.newStringProperty("smtpHostname", "localhost");
			smtpHostname.addListener(this);
			smtpPort = advancedProperties.newIntegerProperty("smtpPort", 25, 1, 65536);
			smtpPort.addListener(this);
			smtpUseSsl = advancedProperties.newBooleanProperty("smtpUseSsl", false);
			smtpUseSsl.addListener(this);
			smtpUseTls = advancedProperties.newBooleanProperty("smtpUseTls", false);
			smtpUseTls.addListener(this);
			smtpSenderEmail =
					advancedProperties.newStringProperty("smtpSenderEmail", "[email protected]");
			smtpSenderEmail.addListener(this);
			smtpSenderName = advancedProperties.newStringProperty("smtpSenderName", "");
			smtpSenderName.addListener(this);
			smtpUsername = advancedProperties.newStringProperty("smtpUsername", "");
			smtpUsername.addListener(this);
			smtpPassword = advancedProperties.newStringProperty("smtpPassword", "");
			smtpPassword.addListener(this);
			schedulerThreadPoolSize = advancedProperties.newIntegerProperty("schedulerThreadPoolSize", 20, 1, 200);
			schedulerThreadPoolSize.addListener(this);
			clusterInstanceId = advancedProperties.newIntegerProperty("clusterInstanceId", null, 0, 131072);
			clusterInstanceId.addListener(this);
			if (clusterInstanceId.getValue() == null)
				clusterInstanceId.setValue((int) System.currentTimeMillis() % 131072);
		} catch (XPathExpressionException e) {
			throw new SearchLibException(e);
		} catch (ParserConfigurationException e) {
			throw new SearchLibException(e);
		} catch (SAXException e) {
			throw new SearchLibException(e);
		} catch (IOException e) {
			throw new SearchLibException(e);
		} catch (URISyntaxException e) {
			throw new SearchLibException(e);
		}
	}

	protected Client newClient(File initFileOrDir, boolean createIndexIfNotExists, boolean disableCrawler,
			String silentReplicationUrl) throws SearchLibException {
		return new Client(initFileOrDir, createIndexIfNotExists, disableCrawler, silentReplicationUrl);
	}

	final public Client getNewClient(File initFileOrDir, boolean createIndexIfNotExists, boolean disableCrawler)
			throws SearchLibException {
		try {
			if (!FileUtils.isSubDirectory(StartStopListener.OPENSEARCHSERVER_DATA_FILE, initFileOrDir))
				throw new SearchLibException("Security alert: " + initFileOrDir + " is outside OPENSEARCHSERVER_DATA ("
						+ StartStopListener.OPENSEARCHSERVER_DATA_FILE + ")");
		} catch (IOException e) {
			throw new SearchLibException(e);
		}
		return newClient(initFileOrDir, createIndexIfNotExists, disableCrawler, null);
	}

	public static void setInstance(ClientFactory cf) {
		INSTANCE = cf;
	}

	public PropertyItem getBooleanQueryMaxClauseCount() {
		return booleanQueryMaxClauseCount;
	}

	public PropertyItem getDefaultWebBrowserDriver() {
		return defaultWebBrowserDriver;
	}

	public PropertyItem getSoapActive() {
		return soapActive;
	}

	public PropertyItem getExternalParser() {
		return externalParser;
	}

	public PropertyItem getLogFullTrace() {
		return logFullTrace;
	}

	public PropertyItem getSmtpHostname() {
		return smtpHostname;
	}

	public PropertyItem getSmtpPort() {
		return smtpPort;
	}

	public PropertyItem getSmtpUseSsl() {
		return smtpUseSsl;
	}

	public PropertyItem getSmtpUseTls() {
		return smtpUseTls;
	}

	public PropertyItem getSmtpSenderEmail() {
		return smtpSenderEmail;
	}

	public PropertyItem getSmtpSenderName() {
		return smtpSenderName;
	}

	public PropertyItem getSmtpUsername() {
		return smtpUsername;
	}

	public PropertyItem getSmtpPassword() {
		return smtpPassword;
	}

	public PropertyItem getSchedulerThreadPoolSize() {
		return schedulerThreadPoolSize;
	}

	public PropertyItem getClusterInstanceId() {
		return clusterInstanceId;
	}

	@Override
	public void hasBeenSet(PropertyItem prop) throws IOException {
		if (prop == booleanQueryMaxClauseCount)
			BooleanQuery.setMaxClauseCount(booleanQueryMaxClauseCount.getValue());
		else if (prop == logFullTrace)
			Logging.setShowStackTrace(logFullTrace.isValue());
		advancedProperties.save();
	}

}