/*
* 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.util.resource;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLConnection;
import org.apache.wicket.util.file.File;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.lang.Bytes;
import org.apache.wicket.util.time.Time;
/**
* A FileResourceStream is an IResource implementation for files.
*
* @see org.apache.wicket.util.resource.IResourceStream
* @see org.apache.wicket.util.watch.IModifiable
* @author Jonathan Locke
*/
public class FileResourceStream extends AbstractResourceStream
implements
IFixedLocationResourceStream
{
private static final long serialVersionUID = 1L;
/** Any associated file */
private final File file;
/** Resource stream */
private transient InputStream inputStream;
/**
* Constructor.
*
* @param file
* {@link File} containing resource
*/
public FileResourceStream(final File file)
{
Args.notNull(file, "file");
this.file = file;
}
/**
* Constructor.
*
* @param file
* {@link java.io.File} containing resource
*/
public FileResourceStream(final java.io.File file)
{
this.file = new File(file);
}
/**
* Closes this resource.
*
* @throws IOException
*/
public void close() throws IOException
{
if (inputStream != null)
{
inputStream.close();
inputStream = null;
}
}
@Override
public String getContentType()
{
String contentType = null;
if (file != null)
{
contentType = URLConnection.getFileNameMap().getContentTypeFor(file.getName());
}
return contentType;
}
/**
* @return The file this resource resides in, if any.
*/
public File getFile()
{
return file;
}
/**
* @return A readable input stream for this resource. The same input stream is returned until
* <tt>FileResourceStream.close()</tt> is invoked.
*
* @throws ResourceStreamNotFoundException
*/
public InputStream getInputStream() throws ResourceStreamNotFoundException
{
if (inputStream == null)
{
try
{
inputStream = new FileInputStream(file);
}
catch (FileNotFoundException e)
{
throw new ResourceStreamNotFoundException("Resource " + file +
" could not be found", e);
}
}
return inputStream;
}
/**
* @see org.apache.wicket.util.watch.IModifiable#lastModifiedTime()
* @return The last time this resource was modified
*/
@Override
public Time lastModifiedTime()
{
if (file != null)
{
return file.lastModifiedTime();
}
return null;
}
@Override
public String toString()
{
if (file != null)
{
return file.toString();
}
return "";
}
@Override
public Bytes length()
{
if (file != null)
{
return Bytes.bytes(file.length());
}
return null;
}
public String locationAsString()
{
if (file != null)
{
return file.getAbsolutePath();
}
return null;
}
}