cmsresourcetranslator.java

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/*
 * File   : $Source: /usr/local/cvs/opencms/src/org/opencms/util/CmsResourceTranslator.java,v $
 * Date   : $Date: 2007-08-13 16:29:56 $
 * Version: $Revision: 1.25 $
 *
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) 2002 - 2007 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 GmbH, 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.util;

import org.opencms.main.CmsLog;

import org.apache.commons.logging.Log;
import org.apache.oro.text.PatternCache;
import org.apache.oro.text.PatternCacheFIFO;
import org.apache.oro.text.perl.MalformedPerl5PatternException;
import org.apache.oro.text.perl.Perl5Util;
import org.apache.oro.text.regex.MalformedPatternException;

/**
 * Provides a resource name / path translation facility.<p>
 * 
 * This facility is used for translating new file names that contain
 * illegal chars to legal names. This feature is most useful (and currently
 * only used) for uploaded files. It is also applied to uploded ZIP directories
 * that are extracted after upload. 
 * The rules that are used for resource name translation are available from 
 * {@link org.opencms.file.CmsRequestContext#getFileTranslator()}.<p> 
 * 
 * Optionally, resource name translation is also applied to all files read 
 * from the VFS, so it can be used for accessing files out of teir usual context.
 * This feature is called directoy translation, and the configured directory 
 * translations are available from {@link org.opencms.file.CmsRequestContext#getDirectoryTranslator()}.<p> 
 * 
 * Directory translation was originally required for backward compatibility
 * to the directory layout before OpenCms 5.0 beta 2. In a modern installation,
 * directory translation is usually disabled.<p>
 *  
 * The translations can be configured in <code>opencms-vfs.xml</code>
 * in the <code>opencms\vfs\resources\translations</code> node.<p>
 * 
 * The default file name translation setting is:<br>
 * <pre>
 * &lt;filetranslations enabled="true"&gt;
 *    &lt;translation&gt;s#[\s]+#_#g&lt;/translation&gt;
 *    &lt;translation&gt;s#\\#/#g&lt;/translation&gt;
 *    &lt;translation&gt;s#