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/*
* Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
import java.io.*;
import java.net.*;
import java.nio.channels.*;
import java.nio.charset.*;
/**
* A Content type that provides for transferring files.
*
* @author Mark Reinhold
* @author Brad R. Wetmore
*/
class FileContent implements Content {
private static File ROOT = new File("root");
private File fn;
FileContent(URI uri) {
fn = new File(ROOT,
uri.getPath()
.replace('/',
File.separatorChar));
}
private String type = null;
public String type() {
if (type != null)
return type;
String nm = fn.getName();
if (nm.endsWith(".html"))
type = "text/html; charset=iso-8859-1";
else if ((nm.indexOf('.') < 0) || nm.endsWith(".txt"))
type = "text/plain; charset=iso-8859-1";
else
type = "application/octet-stream";
return type;
}
private FileChannel fc = null;
private long length = -1;
private long position = -1; // NB only; >= 0 if transferring
public long length() {
return length;
}
public void prepare() throws IOException {
if (fc == null)
fc = new RandomAccessFile(fn, "r").getChannel();
length = fc.size();
position = 0; // NB only
}
public boolean send(ChannelIO cio) throws IOException {
if (fc == null)
throw new IllegalStateException();
if (position < 0) // NB only
throw new IllegalStateException();
/*
* Short-circuit if we're already done.
*/
if (position >= length) {
return false;
}
position += cio.transferTo(fc, position, length - position);
return (position < length);
}
public void release() throws IOException {
if (fc != null) {
fc.close();
fc = null;
}
}
}
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