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Java > Open Source Codes > FileContent


1 /*
2  * @(#)FileContent.java 1.3 05/11/17
3  *
4  * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * -Redistribution of source code must retain the above copyright notice, this
10  * list of conditions and the following disclaimer.
11  *
12  * -Redistribution in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  *
16  * Neither the name of Sun Microsystems, Inc. or the names of contributors may
17  * be used to endorse or promote products derived from this software without
18  * specific prior written permission.
19  *
20  * This software is provided "AS IS," without a warranty of any kind. ALL
21  * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
22  * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
23  * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
24  * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
25  * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
26  * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
27  * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
28  * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
29  * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
30  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
31  *
32  * You acknowledge that this software is not designed, licensed or intended
33  * for use in the design, construction, operation or maintenance of any
34  * nuclear facility.
35  */
36
37 import java.io.*;
38 import java.net.*;
39 import java.nio.channels.*;
40 import java.nio.charset.*;
41
42 /**
43  * A Content type that provides for transferring files.
44  *
45  * @author Mark Reinhold
46  * @author Brad R. Wetmore
47  * @version 1.3, 05/11/17
48  */
49 class FileContent implements Content {
50
51     private static File ROOT = new File("root");
52
53     private File fn;
54
55     FileContent(URI uri) {
56     fn = new File(ROOT,
57               uri.getPath()
58               .replace('/',
59                    File.separatorChar));
60     }
61
62     private String JavaDoc type = null;
63
64     public String JavaDoc type() {
65     if (type != null)
66         return type;
67     String JavaDoc nm = fn.getName();
68     if (nm.endsWith(".html"))
69         type = "text/html; charset=iso-8859-1";
70     else if ((nm.indexOf('.') < 0) || nm.endsWith(".txt"))
71         type = "text/plain; charset=iso-8859-1";
72     else
73         type = "application/octet-stream";
74     return type;
75     }
76
77     private FileChannel fc = null;
78     private long length = -1;
79     private long position = -1; // NB only; >= 0 if transferring
80
81     public long length() {
82     return length;
83     }
84
85     public void prepare() throws IOException {
86     if (fc == null)
87         fc = new RandomAccessFile(fn, "r").getChannel();
88     length = fc.size();
89     position = 0; // NB only
90 }
91
92     public boolean send(ChannelIO cio) throws IOException {
93     if (fc == null)
94         throw new IllegalStateException JavaDoc();
95     if (position < 0) // NB only
96 throw new IllegalStateException JavaDoc();
97
98     /*
99      * Short-circuit if we're already done.
100      */
101     if (position >= length) {
102         return false;
103     }
104
105     position += cio.transferTo(fc, position, length - position);
106     return (position < length);
107     }
108
109     public void release() throws IOException {
110     if (fc != null) {
111         fc.close();
112         fc = null;
113     }
114     }
115 }
116
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