| /* |
| * 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 (http://www.visigoths.org/)." |
| * 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 visigoths@visigoths.org. |
| * |
| * 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 IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * 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 |
| * http://www.visigoths.org/ |
| */ |
| |
| |
| package freemarker.cache; |
| |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| import java.net.URL; |
| |
| /** |
| * This is an abstract template loader that can load templates whose |
| * location can be described by an URL. Subclasses only need to override |
| * the {@link #getURL(String)} method. Both {@link ClassTemplateLoader} and |
| * {@link WebappTemplateLoader} are (quite trivial) subclasses of this class. |
| * @author Attila Szegedi |
| */ |
| public abstract class URLTemplateLoader implements TemplateLoader |
| { |
| public Object findTemplateSource(String name) |
| throws |
| IOException |
| { |
| 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. |
| * @param name the name of the sought template, including the locale |
| * decorations. |
| * @return 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 ((URLTemplateSource) templateSource).lastModified(); |
| } |
| |
| public Reader getReader(Object templateSource, String encoding) |
| throws |
| IOException |
| { |
| return new InputStreamReader( |
| ((URLTemplateSource) templateSource).getInputStream(), |
| encoding); |
| } |
| |
| public void closeTemplateSource(Object templateSource) |
| throws |
| IOException |
| { |
| ((URLTemplateSource) templateSource).close(); |
| } |
| |
| /** |
| * Can be used by subclasses to canonicalize URL path prefixes. |
| * @param prefix the path prefix to canonicalize |
| * @return 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; |
| } |
| } |