/******************************************************************************
 * Copyright (C) 2013 Elaine Tan                                              *
 * Copyright (C) 2013 Trek Global
 * This program is free software; you can redistribute it and/or modify it    *
 * under the terms version 2 of the GNU General Public License as published   *
 * by the Free Software Foundation. This program 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 this program; if not, write to the Free Software Foundation, Inc.,    *
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.                     *
 *****************************************************************************/
package org.adempiere.base;

import java.util.logging.Level;

import org.adempiere.base.equinox.EquinoxExtensionLocator;
import org.adempiere.model.ITaxProvider;
import org.compiere.util.CLogger;

/**
 * Default {@link ITaxProviderFactory} implementation for core.<br/>
 * Load {@link ITaxProvider} instance from plugin.xml (org.adempiere.model.ITaxProvider extension point) or class path.
 * @author Elaine
 */
public class DefaultTaxProviderFactory implements ITaxProviderFactory {

	private final static CLogger s_log = CLogger.getCLogger(DefaultTaxProviderFactory.class);

	@Override
	public ITaxProvider newTaxProviderInstance(String className) {
		ITaxProvider myCalculator = EquinoxExtensionLocator.instance().locate(ITaxProvider.class, className, null).getExtension();
		if (myCalculator == null) 
		{
			//fall back to dynamic java class loading
			try 
			{
				Class<?> ppClass = Class.forName(className);
				if (ppClass != null)
					myCalculator = (ITaxProvider) ppClass.getDeclaredConstructor().newInstance();
			} 
			catch (Error e1) 
			{   //  NoClassDefFound
				s_log.log(Level.SEVERE, className + " - Error=" + e1.getMessage());
				return null;
			} 
			catch (Exception e2) 
			{
				s_log.log(Level.SEVERE, className, e2);
				return null;
			}
		}
		if (myCalculator == null) 
		{
			s_log.log(Level.SEVERE, "Not found in extension registry and classpath");
			return null;
		}
		
		return myCalculator;
	}
}