/*
* 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.core.util.resource;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.servlet.ServletContext;
import org.apache.wicket.Application;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.util.io.Connections;
import org.apache.wicket.util.io.IOUtils;
import org.apache.wicket.util.lang.Bytes;
import org.apache.wicket.util.resource.AbstractResourceStream;
import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
import org.apache.wicket.util.time.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An {@link org.apache.wicket.util.resource.IResourceStream} that reads data from a file in the web application
*
* @author <a href="mailto:jbq@apache.org">Jean-Baptiste Quenot</a>
*/
public class WebExternalResourceStream extends AbstractResourceStream
{
private static final Logger log = LoggerFactory.getLogger(WebExternalResourceStream.class);
private static final long serialVersionUID = 1L;
transient InputStream in;
/** the relative url of the external resource. */
private final String url;
/**
* Construct.
*
* @param url
* the relative url of the external resource
*/
public WebExternalResourceStream(String url)
{
if (url == null)
{
throw new IllegalArgumentException("Argument url must be not null");
}
this.url = url;
}
@Override
public Bytes length()
{
return null;
}
@Override
public void close() throws IOException
{
// getInputStream() is not always called (WICKET-790)
IOUtils.close(in);
}
@Override
public Time lastModifiedTime()
{
try
{
final ServletContext context = ((WebApplication)Application.get()).getServletContext();
final URL resourceURL = context.getResource(url);
if (resourceURL == null)
{
throw new FileNotFoundException("Unable to find resource '" + url +
"' in the servlet context");
}
return Connections.getLastModified(resourceURL);
}
catch (IOException e)
{
log.warn("failed to retrieve last modified timestamp", e);
return null;
}
}
@Override
public String getContentType()
{
return WebApplication.get().getServletContext().getMimeType(url);
}
@Override
public InputStream getInputStream() throws ResourceStreamNotFoundException
{
final ServletContext context = ((WebApplication)Application.get()).getServletContext();
in = context.getResourceAsStream(url);
if (in == null)
{
throw new ResourceStreamNotFoundException("The requested resource was not found: " +
url);
}
return in;
}
}