MatchingRuleParser.java

/*
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.servlet.sip.startup.loading.rules;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * @author Thomas Leseney
 */
public class MatchingRuleParser {
	
	public static MatchingRule buildRule(Element e) {
		String name = e.getNodeName();
		
		if ("and".equals(name)) {
			AndRule and = new AndRule();
			NodeList list = e.getChildNodes();
			for (int i = 0; i < list.getLength(); i++) {
				Node n = list.item(i);
				if (n.getNodeType() == Node.ELEMENT_NODE) {
					and.addCriterion(buildRule((Element) n));
				}
			}
			return and;
		} else if ("equal".equals(name)) {
			String var = getString(e, "var") ;
			String value = getString(e, "value");
			boolean ignoreCase = "true".equalsIgnoreCase(e.getAttribute("ignore-case"));
			return new EqualsRule(var, value, ignoreCase);
		} else if ("subdomain-of".equals(name)) {
			String var = getString(e, "var");
			String value = getString(e, "value");
			return new SubdomainRule(var, value);
		} else if ("or".equals(name)) {
			OrRule or = new OrRule();
			NodeList list = e.getChildNodes();
			for (int i = 0; i < list.getLength(); i++) {
				Node n = list.item(i);
				if (n.getNodeType() == Node.ELEMENT_NODE) {
					or.addCriterion(buildRule((Element) n));
				}
			}
			return or;
		} else if ("not".equals(name)) {
			NotRule not = new NotRule();
			NodeList list = e.getChildNodes();
			for (int i = 0; i < list.getLength(); i++) {
				Node n = list.item(i);
				if (n.getNodeType() == Node.ELEMENT_NODE) {
					not.setCriterion(buildRule((Element) n));
				}
			}
			return not;
		} else if ("contains".equals(name)) {
			String var = getString(e, "var");
			String value = getString(e, "value");
			boolean ignoreCase = "true".equalsIgnoreCase(e.getAttribute("ignore-case"));
			return new ContainsRule(var, value, ignoreCase);
		} else if ("exists".equals(name)) {
			return new ExistsRule(getString(e, "var"));
		} else {
			throw new IllegalArgumentException("Unknown rule: " + name);
		} 
	} 
	
	public static String getString(Element e, String name) {
		NodeList list = e.getElementsByTagName(name);
		return ((Element) list.item(0)).getTextContent();
	}
}