001/* 002 * This library is part of OpenCms - 003 * the Open Source Content Management System 004 * 005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * For further information about Alkacon Software, please see the 018 * company website: http://www.alkacon.com 019 * 020 * For further information about OpenCms, please see the 021 * project website: http://www.opencms.org 022 * 023 * You should have received a copy of the GNU Lesser General Public 024 * License along with this library; if not, write to the Free Software 025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 026 */ 027 028package org.opencms.configuration; 029 030import org.opencms.file.types.CmsResourceTypeUnknown; 031import org.opencms.file.types.I_CmsResourceType; 032import org.opencms.main.CmsLog; 033 034import org.apache.commons.digester3.AbstractObjectCreationFactory; 035import org.apache.commons.logging.Log; 036 037import org.xml.sax.Attributes; 038 039/** 040 * Factory to create resource type instances from the XML configuration.<p> 041 * 042 * This is required because the default digester implementation will cause an exception in case 043 * a resource type class is missing. However, a missing class is common if a module with a new resource type 044 * class is imported. In this case, the resource type class is changes to <code>{@link org.opencms.file.types.CmsResourceTypeUnknown}</code>, 045 * so that the import of the resources can proceed.<p> 046 * 047 * @since 6.0.2 048 */ 049public class CmsDigesterResourceTypeCreationFactory extends AbstractObjectCreationFactory<I_CmsResourceType> { 050 051 /** The log object of this class. */ 052 private static final Log LOG = CmsLog.getLog(CmsDigesterResourceTypeCreationFactory.class); 053 054 /** 055 * Default constructor for the resource type configuration factory.<p> 056 */ 057 public CmsDigesterResourceTypeCreationFactory() { 058 059 super(); 060 } 061 062 /** 063 * @see org.apache.commons.digester3.ObjectCreationFactory#createObject(org.xml.sax.Attributes) 064 */ 065 @Override 066 public I_CmsResourceType createObject(Attributes attributes) throws Exception { 067 068 // get the class name attribute 069 String className = attributes.getValue(I_CmsXmlConfiguration.A_CLASS); 070 // create the class instance 071 I_CmsResourceType type; 072 try { 073 if (className != null) { 074 className = className.trim(); 075 } 076 type = (I_CmsResourceType)Class.forName(className).newInstance(); 077 } catch (Exception e) { 078 // resource type is unknown, use dummy class to import the module resources 079 type = new CmsResourceTypeUnknown(); 080 // write an error to the log 081 LOG.error( 082 Messages.get().getBundle().key( 083 Messages.ERR_UNKNOWN_RESTYPE_CLASS_2, 084 className, 085 type.getClass().getName()), 086 e); 087 } 088 return type; 089 } 090}