/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.wicket.examples.customresourceloading;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.wicket.Page;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.examples.WicketExampleApplication;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.resource.UrlResourceStream;
import org.apache.wicket.util.resource.locator.IResourceStreamLocator;
import org.apache.wicket.util.resource.locator.ResourceStreamLocator;
import org.apache.wicket.util.string.Strings;
/**
* Application class for the custom resource loading example.
*
* @author Eelco Hillenius
*/
public class CustomResourceLoadingApplication extends WicketExampleApplication
{
/** log. */
private static final Log log = LogFactory.getLog(CustomResourceLoadingApplication.class);
/**
* Custom implementation of {@link IResourceStreamLocator}.
*/
private final class CustomResourceStreamLocator extends ResourceStreamLocator
{
/**
* @see org.apache.wicket.util.resource.locator.ResourceStreamLocator#locate(java.lang.Class,
* java.lang.String)
*/
@Override
public IResourceStream locate(Class<?> clazz, String path)
{
// Log attempt
if (log.isDebugEnabled())
{
log.debug("Attempting to locate resource '" + path +
"' using classloader the servlet context");
}
String location;
if (clazz == AlternativePageFromWebContext.class)
{
// this custom case disregards the path and tries it's own
// scheme
String extension = path.substring(path.lastIndexOf('.') + 1);
String simpleFileName = Strings.lastPathComponent(clazz.getName(), '.');
location = "/WEB-INF/templates/" + simpleFileName + "." + extension;
}
else
{
// use the normal package to path conversion of the passed in
// path variable
location = "/WEB-INF/templates/" + path;
}
URL url;
try
{
// try to load the resource from the web context
url = getServletContext().getResource(location);
if (url != null)
{
return new UrlResourceStream(url);
}
}
catch (MalformedURLException e)
{
throw new WicketRuntimeException(e);
}
// resource not found; fall back on class loading
return super.locate(clazz, path);
}
}
/**
* Constructor.
*/
public CustomResourceLoadingApplication()
{
}
/**
* @see org.apache.wicket.Application#getHomePage()
*/
@Override
public Class<? extends Page> getHomePage()
{
return Index.class;
}
/**
* @see WebApplication#init()
*/
@Override
protected void init()
{
super.init();
getResourceSettings().setResourceStreamLocator(new CustomResourceStreamLocator());
}
}