/*
 * 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.wicket.Page;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.core.util.resource.UrlResourceStream;
import org.apache.wicket.core.util.resource.locator.IResourceStreamLocator;
import org.apache.wicket.core.util.resource.locator.ResourceStreamLocator;
import org.apache.wicket.csp.CSPDirective;
import org.apache.wicket.examples.WicketExampleApplication;
import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.string.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Application class for the custom resource loading example.
 * 
 * @author Eelco Hillenius
 */
public class CustomResourceLoadingApplication extends WicketExampleApplication
{
    /** log. */
    private static final Logger log = LoggerFactory.getLogger(CustomResourceLoadingApplication.class);

    /**
     * Custom implementation of {@link IResourceStreamLocator}.
     */
    private final class CustomResourceStreamLocator extends ResourceStreamLocator
    {
        @Override
        public IResourceStream locate(Class<?> clazz, String path)
        {
            log.debug("Attempting to locate resource '{}' using classloader the servlet context", path);

            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()
    {
    }

    @Override
    public Class<? extends Page> getHomePage()
    {
        return Index.class;
    }

    @Override
    protected void init()
    {
        super.init();

        getResourceSettings().setResourceStreamLocator(new CustomResourceStreamLocator());
    }
}