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      1 /*
      2  * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  *   - Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  *
     11  *   - Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  *
     15  *   - Neither the name of Oracle nor the names of its
     16  *     contributors may be used to endorse or promote products derived
     17  *     from this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
     20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * This source code is provided to illustrate the usage of a given feature
     34  * or technique and has been deliberately simplified. Additional steps
     35  * required for a production-quality application, such as security checks,
     36  * input validation and proper error handling, might not be present in
     37  * this sample code.
     38  */
     39 
     40 
     41 import java.io.*;
     42 import java.net.*;
     43 import java.nio.channels.*;
     44 import java.nio.charset.*;
     45 
     46 /**
     47  * A Content type that provides for transferring files.
     48  *
     49  * @author Mark Reinhold
     50  * @author Brad R. Wetmore
     51  */
     52 class FileContent implements Content {
     53 
     54     private static File ROOT = new File("root");
     55 
     56     private File fn;
     57 
     58     FileContent(URI uri) {
     59         fn = new File(ROOT,
     60                       uri.getPath()
     61                       .replace('/',
     62                                File.separatorChar));
     63     }
     64 
     65     private String type = null;
     66 
     67     public String type() {
     68         if (type != null)
     69             return type;
     70         String nm = fn.getName();
     71         if (nm.endsWith(".html"))
     72             type = "text/html; charset=iso-8859-1";
     73         else if ((nm.indexOf('.') < 0) || nm.endsWith(".txt"))
     74             type = "text/plain; charset=iso-8859-1";
     75         else
     76             type = "application/octet-stream";
     77         return type;
     78     }
     79 
     80     private FileChannel fc = null;
     81     private long length = -1;
     82     private long position = -1;         // NB only; >= 0 if transferring
     83 
     84     public long length() {
     85         return length;
     86     }
     87 
     88     public void prepare() throws IOException {
     89         if (fc == null)
     90             fc = new RandomAccessFile(fn, "r").getChannel();
     91         length = fc.size();
     92         position = 0;                   // NB only
     93     }
     94 
     95     public boolean send(ChannelIO cio) throws IOException {
     96         if (fc == null)
     97             throw new IllegalStateException();
     98         if (position < 0)               // NB only
     99             throw new IllegalStateException();
    100 
    101         /*
    102          * Short-circuit if we're already done.
    103          */
    104         if (position >= length) {
    105             return false;
    106         }
    107 
    108         position += cio.transferTo(fc, position, length - position);
    109         return (position < length);
    110     }
    111 
    112     public void release() throws IOException {
    113         if (fc != null) {
    114             fc.close();
    115             fc = null;
    116         }
    117     }
    118 }
    119