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   * Copyright (c) 2003 The Visigoth Software Society. All rights
   * reserved.
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  * 3. The end-user documentation included with the redistribution, if
  *    any, must include the following acknowledgement:
  *       "This product includes software developed by the
  *        Visigoth Software Society ("
  *    Alternately, this acknowledgement may appear in the software itself,
  *    if and wherever such third-party acknowledgements normally appear.
  * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
  *    project contributors may be used to endorse or promote products derived
  *    from this software without prior written permission. For written
  *    permission, please contact
  * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
  *    nor may "FreeMarker" or "Visigoth" appear in their names
  *    without prior written permission of the Visigoth Software Society.
  * ====================================================================
  * This software consists of voluntary contributions made by many
  * individuals on behalf of the Visigoth Software Society. For more
  * information on the Visigoth Software Society, please see
 package freemarker.cache;

This is an abstract template loader that can load templates whose location can be described by an URL. Subclasses only need to override the getURL(java.lang.String) method. Both ClassTemplateLoader and WebappTemplateLoader are (quite trivial) subclasses of this class.

Attila Szegedi
$Id:,v 1.14 2003/01/29 08:01:17 szegedia Exp $
 public abstract class URLTemplateLoader implements TemplateLoader
     public Object findTemplateSource(String name)
         URL url = getURL(name);
         return url == null ? null : new URLTemplateSource(url);
Given a template name (plus potential locale decorations) retrieves an URL that points the template source.

name the name of the sought template, including the locale decorations.
an URL that points to the template source, or null if it can determine that the template source does not exist.
     protected abstract URL getURL(String name);
     public long getLastModified(Object templateSource)
         return ((URLTemplateSourcetemplateSource).lastModified();
     public Reader getReader(Object templateSourceString encoding)
         return new InputStreamReader(
    public void closeTemplateSource(Object templateSource)

Can be used by subclasses to canonicalize URL path prefixes.

prefix the path prefix to canonicalize
the canonicalized prefix. All backslashes are replaced with forward slashes, and a trailing slash is appended if the original prefix wasn't empty and didn't already end with a slash.
    protected static String canonicalizePrefix(String prefix)
        // make it foolproof
        prefix = prefix.replace('\\''/');
        // ensure there's a trailing slash
        if (prefix.length() > 0 && !prefix.endsWith("/"))
            prefix += "/";
        return prefix;
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