/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library 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 library 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.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.configuration;
import org.opencms.file.types.CmsResourceTypeUnknown;
import org.opencms.file.types.I_CmsResourceType;
import org.opencms.main.CmsLog;
import org.apache.commons.digester.AbstractObjectCreationFactory;
import org.apache.commons.logging.Log;
import org.xml.sax.Attributes;
/**
* Factory to create resource type instances from the XML configuration.<p>
*
* This is required because the default digester implementation will cause an exception in case
* a resource type class is missing. However, a missing class is common if a module with a new resource type
* class is imported. In this case, the resource type class is changes to <code>{@link org.opencms.file.types.CmsResourceTypeUnknown}</code>,
* so that the import of the resources can proceed.<p>
*
* @since 6.0.2
*/
public class CmsDigesterResourceTypeCreationFactory extends AbstractObjectCreationFactory {
/** The log object of this class. */
private static final Log LOG = CmsLog.getLog(CmsDigesterResourceTypeCreationFactory.class);
/**
* Default constructor for the resource type configuration factory.<p>
*/
public CmsDigesterResourceTypeCreationFactory() {
super();
}
/**
* @see org.apache.commons.digester.ObjectCreationFactory#createObject(org.xml.sax.Attributes)
*/
@Override
public Object createObject(Attributes attributes) throws Exception {
// get the class name attribute
String className = attributes.getValue(I_CmsXmlConfiguration.A_CLASS);
// create the class instance
I_CmsResourceType type;
try {
if (className != null) {
className = className.trim();
}
type = (I_CmsResourceType)Class.forName(className).newInstance();
} catch (Exception e) {
// resource type is unknown, use dummy class to import the module resources
type = new CmsResourceTypeUnknown();
// write an error to the log
LOG.error(Messages.get().getBundle().key(
Messages.ERR_UNKNOWN_RESTYPE_CLASS_2,
className,
type.getClass().getName()), e);
}
return type;
}
}