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