WebScriptItem.java

/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 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 <http://www.gnu.org/licenses/>.
 **/

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

import groovy.lang.Binding;
import groovy.lang.GroovyShell;
import groovy.lang.Script;

import java.io.UnsupportedEncodingException;

import org.w3c.dom.Node;
import org.xml.sax.SAXException;

import com.jaeksoft.searchlib.crawler.web.database.AbstractPatternNameValueItem;
import com.jaeksoft.searchlib.crawler.web.spider.HttpDownloader;
import com.jaeksoft.searchlib.util.DomUtils;
import com.jaeksoft.searchlib.util.ReadWriteLock;
import com.jaeksoft.searchlib.util.StringUtils;
import com.jaeksoft.searchlib.util.XmlWriter;

public class WebScriptItem extends AbstractPatternNameValueItem {

	private Script script;

	public WebScriptItem() {
		script = null;
	}

	public WebScriptItem(Node node) {
		script = null;
		String s = DomUtils.getText(node);
		if (!StringUtils.isEmpty(s))
			setValue(StringUtils.base64decode(s));
		setName(StringUtils.base64decode(DomUtils
				.getAttributeText(node, "name")));
		setPattern(StringUtils.base64decode(DomUtils.getAttributeText(node,
				"pattern")));
	}

	@Override
	public void writeXml(XmlWriter xmlWriter)
			throws UnsupportedEncodingException, SAXException {
		xmlWriter.startElement(
				WebScriptManager.ITEM_NODE_NAME,
				"name",
				new String(StringUtils.base64encode(name)),
				"pattern",
				pattern == null ? null : new String(StringUtils
						.base64encode(pattern)));
		if (value != null)
			xmlWriter.textNode(StringUtils.base64encode(value));
		xmlWriter.endElement();
	}

	@Override
	protected void changeEvent() {
		setScript(null);
	}

	@Override
	public boolean isCheckable() {
		return true;
	}

	@Override
	public String check() {
		getScript();
		return script == null ? "Empty script" : "Successful compiling";
	}

	private ReadWriteLock syncLock = new ReadWriteLock();

	private void setScript(Script script) {
		syncLock.w.lock();
		try {
			this.script = script;
		} finally {
			syncLock.w.unlock();
		}
	}

	public Script getScript() {
		syncLock.r.lock();
		try {
			if (script != null)
				return script;
		} finally {
			syncLock.r.unlock();
		}
		String v = getValue();
		if (StringUtils.isEmpty(v))
			return null;
		GroovyShell shell = new GroovyShell();
		Script s = shell.parse(getValue());
		setScript(s);
		return s;
	}

	public void exec(HttpDownloader httpDownloader) {
		Script s = getScript();
		if (s == null)
			return;
		Binding binding = new Binding();
		binding.setVariable("downloader", httpDownloader);
		s.setBinding(binding);
		s.run();
	}
}