Resolve a relative URL string against an absolute URL string
/*
Copyright (c) 2003 eInnovation Inc. All rights reserved
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.
*/
/*--
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*/
/**
* Utility class for working with request paths.
*
* @author Anthony Eden
*/
public final class PathUtilities
{
private static final String WILDCARD = "*";
/**
* resolve a relative URL string against an absolute URL string.
*
* This method was adapted from the CalCom library at http://www.calcom.de
*
* <p>the absolute URL string is the start point for the
* relative path.</p>
*
* <p><b>Example:</b></p>
* <pre>
* relative path: ../images/test.jpg
* absolute path: file:/d:/eigene dateien/eigene bilder/
* result: file:/d:/eigene dateien/images/test.jpg
* </pre>
*
* @param relPath The relative URL string to resolve. Unlike the Calcom version, this may be
* an absolute path, if it starts with "/".
* @param absPath The absolute URL string to start at. Unlike the CalCom version, this may be a filename
* rather than just a path.
*
* @return the absolute URL string resulting from resolving relPath against absPath
*
* @author Ulrich Hilger
* @author CalCom
* @author <a href="http://www.calcom.de">http://www.calcom.de</a>
* @author <a href="mailto:info@calcom.de">info@calcom.de</a>
* @author Dennis Brown (eInnovation)
*/
public static String resolveRelativePath(String relPath, String absPath)
{
// if relative path is really absolute, then ignore absPath (eInnovation change)
if ( relPath.startsWith( "/" ) )
{
absPath = "";
}
String newAbsPath = absPath;
String newRelPath = relPath;
if( relPath.startsWith("$"))
{
return relPath;
}
else if (absPath.endsWith("/"))
{
newAbsPath = absPath.substring(0, absPath.length() - 1);
}
else
{
// absPath ends with a filename, remove it (eInnovation change)
int lastSlashIndex = absPath.lastIndexOf('/');
if ( lastSlashIndex >= 0 )
{
newAbsPath = absPath.substring( 0, lastSlashIndex );
}
else
{
newAbsPath = "";
}
}
int relPos = newRelPath.indexOf("../");
while (relPos > -1)
{
newRelPath = newRelPath.substring(relPos + 3);
int lastSlashInAbsPath = newAbsPath.lastIndexOf( "/" );
if ( lastSlashInAbsPath >= 0 )
{
newAbsPath = newAbsPath.substring(0, newAbsPath.lastIndexOf("/"));
}
else
{
// eInnovation change: fix potential exception
newAbsPath = "";
}
relPos = newRelPath.indexOf("../");
}
String returnedPath;
if (newRelPath.startsWith("/"))
{
returnedPath = newAbsPath + newRelPath;
}
else
{
returnedPath = newAbsPath + "/" + newRelPath;
}
// remove any "." references to current directory (eInnovation change)
// For example:
// "./junk" becomes "junk"
// "/./junk" becomes "/junk"
// "junk/." becomes "junk"
while ( returnedPath.endsWith( "/." ) )
{
returnedPath = returnedPath.substring( 0, returnedPath.length() - 2 );
}
do
{
int dotSlashIndex = returnedPath.lastIndexOf( "./" );
if ( dotSlashIndex < 0 )
{
break;
}
else if ( dotSlashIndex == 0 || returnedPath.charAt( dotSlashIndex - 1 ) != '.' )
{
String firstSubstring;
if ( dotSlashIndex > 0 )
{
firstSubstring = returnedPath.substring( 0, dotSlashIndex );
}
else
{
firstSubstring = "";
}
String secondSubstring;
if ( dotSlashIndex + 2 < returnedPath.length() )
{
secondSubstring = returnedPath.substring( dotSlashIndex + 2, returnedPath.length() );
}
else
{
secondSubstring = "";
}
returnedPath = firstSubstring + secondSubstring;
}
} while ( true );
return returnedPath;
}
}
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