// Copyright 2004, 2005 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry.web;
import java.util.Locale;
import org.apache.hivemind.util.LocalizedNameGenerator;
import org.apache.hivemind.util.LocalizedResource;
/**
* Finds localized resources within a {@link org.apache.tapestry.web.WebContext}..
*
* @author Howard Lewis Ship
* @since 4.0
*/
public class LocalizedWebContextResourceFinder
{
private WebContext _context;
public LocalizedWebContextResourceFinder(WebContext context)
{
_context = context;
}
/**
* Resolves the resource, returning a path representing the closest match
* (with respect to the provided locale). Returns null if no match.
* <p>
* The provided path is split into a base path and a suffix (at the last
* period character). The locale will provide different suffixes to the base
* path and the first match is returned.
*/
public LocalizedResource resolve(String contextPath, Locale locale)
{
int dotx = contextPath.lastIndexOf('.');
String basePath;
String suffix;
if (dotx >= 0)
{
basePath = contextPath.substring(0, dotx);
suffix = contextPath.substring(dotx);
}
else
{
// Resource without extension
basePath = contextPath;
suffix = "";
}
LocalizedNameGenerator generator = new LocalizedNameGenerator(basePath,
locale, suffix);
while(generator.more())
{
String candidatePath = generator.next();
if (isExistingResource(candidatePath))
return new LocalizedResource(candidatePath, generator
.getCurrentLocale());
}
return null;
}
private boolean isExistingResource(String path)
{
return _context.getResource(path) != null;
}
}