MyPortalPlusConfigDOM.java

/*
*
* Copyright 2013 Entando S.r.l. (http://www.entando.com) All rights reserved.
*
* This file is part of Entando software. 
* Entando is a free software; 
* You can redistribute it and/or modify it
* under the terms of the GNU General Public License (GPL) as published by the Free Software Foundation; version 2.
* 
* See the file License for the specific language governing permissions   
* and limitations under the License
* 
* 
* 
* Copyright 2013 Entando S.r.l. (http://www.entando.com) All rights reserved.
*
*/
package com.agiletec.plugins.jpmyportalplus.aps.system.services.config.parse;

import java.io.StringReader;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;

import com.agiletec.aps.system.ApsSystemUtils;
import com.agiletec.aps.system.exception.ApsSystemException;
import com.agiletec.plugins.jpmyportalplus.aps.system.services.config.model.MyPortalConfig;

/**
 * This class parses the configuration of jpmyportal
 * @author E.Santoboni - E. Mezzano
 */
public class MyPortalPlusConfigDOM {

	public MyPortalConfig extractConfig(String xml) throws ApsSystemException {
		Element root = this.getRootElement(xml);
		MyPortalConfig config = new MyPortalConfig();
		this.extractWidgetConfig(root, config);
		return config;
	}

	/**
	 * Create an xml containing the MyPortal configuration.
	 * @param config The MyPortal configuration.
	 * @return The xml containing the configuration.
	 * @throws ApsSystemException In case of errors.
	 */
	public String createConfigXml(MyPortalConfig config) throws ApsSystemException {
		Element root = this.createConfigElement(config);
		Document doc = new Document(root);
		String xml = new XMLOutputter().outputString(doc);
		return xml;
	}

	private void extractWidgetConfig(Element root, MyPortalConfig config) {
		Element element = root.getChild(ALLOWED_WIDGETS_ELEM);
		if (null == element) {
			element = root.getChild(ALLOWED_SHOWLETS_ELEM);
		}
		Set<String> allowedWidgets = new TreeSet<String>();
		if (null != element) {
			List<Element> codeElements = element.getChildren(WIDGET_ELEM);
			if (null == codeElements || codeElements.isEmpty()) {
				codeElements = element.getChildren(SHOWLET_ELEM);
			}
			if (null != codeElements) {
				for (Element codeElem : codeElements) {
					String code = codeElem.getAttributeValue(WIDGET_CODE_ATTR);
					allowedWidgets.add(code);
				}
			}
		}
		config.setAllowedShowlets(allowedWidgets);
	}

	/**
	 * Create the configuration element for the myportal service.
	 * @param config The configuration of myportal service
	 * @return the configuration of this plugin.
	 */
	private Element createConfigElement(MyPortalConfig config) {
		Element configElem = new Element(ROOT);
		Element allowedShowletsElem = this.createShowletsElement(config);
		configElem.addContent(allowedShowletsElem);
		return configElem;
	}

	private Element createShowletsElement(MyPortalConfig config) {
		Element showletsElement = new Element(ALLOWED_WIDGETS_ELEM);
		Set<String> showlets = config.getAllowedShowlets();
		if (null != showlets && showlets.size() > 0) {
			Iterator<String> iter = showlets.iterator();
			while (iter.hasNext()) {
				String showletCode = iter.next();
				Element showletElem = new Element(WIDGET_ELEM);
				showletElem.setAttribute(WIDGET_CODE_ATTR, showletCode);
				showletsElement.addContent(showletElem);
			}
		}
		return showletsElement;
	}

	/**
	 * Returns the XML element from a given text.
	 * @param xmlText The text containing an Xml.
	 * @return The XML element from a given text.
	 * @throws ApsSystemException In case of parsing exceptions.
	 */
	private Element getRootElement(String xmlText) throws ApsSystemException {
		SAXBuilder builder = new SAXBuilder();
		builder.setValidation(false);
		StringReader reader = new StringReader(xmlText);
		Element root = null;
		try {
			Document doc = builder.build(reader);
			root = doc.getRootElement();
		} catch (Throwable t) {
			ApsSystemUtils.getLogger().error("Error parsing xml: " + t.getMessage());
			throw new ApsSystemException("Error parsing xml", t);
		}
		return root;
	}

	private static final String ROOT = "myportalConfig";
	
	@Deprecated
	private static final String ALLOWED_SHOWLETS_ELEM = "showlets";
	private static final String ALLOWED_WIDGETS_ELEM = "widgets";
	
	@Deprecated
	private static final String SHOWLET_ELEM = "showlet";
	private static final String WIDGET_ELEM = "widget";
	
	private static final String WIDGET_CODE_ATTR = "code";

}