1 /***************************************
2 * *
3 * JBoss: The OpenSource J2EE WebOS *
4 * *
5 * Distributable under LGPL license. *
6 * See terms of license at gnu.org. *
7 * *
8 ***************************************/
9
10 package org.jboss.net.protocol.file;
11
12 import java.io.File;
13 import java.io.FileNotFoundException;
14 import java.io.IOException;
15 import java.io.InputStream;
16 import java.io.OutputStream;
17 import java.io.FileInputStream;
18 import java.io.FileOutputStream;
19
20 import java.net.URLConnection;
21 import java.net.URL;
22 import java.net.MalformedURLException;
23
24 import java.security.Permission;
25 import java.io.FilePermission;
26
27 /**
28 * Provides local file access via URL semantics, correctly returning
29 * the last modified time of the underlying file.
30 *
31 * @version $Revision: 1.7 $
32 * @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
33 * @author Scott.Stark@jboss.org
34 */
35 public class FileURLConnection
36 extends URLConnection
37 {
38 protected File file;
39
40 public FileURLConnection(final URL url)
41 throws MalformedURLException, IOException
42 {
43 super(url);
44
45 file = new File(url.getPath().replace('/', File.separatorChar).replace('|', ':'));
46
47 doOutput = false;
48 }
49
50 /**
51 * Returns the underlying file for this connection.
52 */
53 public File getFile()
54 {
55 return file;
56 }
57
58 /**
59 * Checks if the underlying file for this connection exists.
60 *
61 * @throws FileNotFoundException
62 */
63 public void connect() throws IOException
64 {
65 if (connected)
66 return;
67
68 if (!file.exists())
69 {
70 throw new FileNotFoundException(file.getPath());
71 }
72
73 connected = true;
74 }
75
76 public InputStream getInputStream() throws IOException
77 {
78 if (!connected)
79 connect();
80
81 return new FileInputStream(file);
82 }
83
84 public OutputStream getOutputStream() throws IOException
85 {
86 if (!connected)
87 connect();
88
89 return new FileOutputStream(file);
90 }
91
92 /**
93 * Provides support for returning the value for the
94 * <tt>last-modified</tt> header.
95 */
96 public String getHeaderField(final String name)
97 {
98 String headerField = null;
99 if (name.equalsIgnoreCase("last-modified"))
100 headerField = String.valueOf(getLastModified());
101 else if (name.equalsIgnoreCase("content-length"))
102 headerField = String.valueOf(file.length());
103 else if (name.equalsIgnoreCase("content-type"))
104 headerField = getFileNameMap().getContentTypeFor(file.getName());
105 else if (name.equalsIgnoreCase("date"))
106 headerField = String.valueOf(file.lastModified());
107 else
108 {
109 // This always returns null currently
110 headerField = super.getHeaderField(name);
111 }
112 return headerField;
113 }
114
115 /**
116 * Return a permission for both read & write since both
117 * input and output streams are supported.
118 */
119 public Permission getPermission() throws IOException
120 {
121 return new FilePermission(file.getPath(), "read,write");
122 }
123
124 /**
125 * Returns the last modified time of the underlying file.
126 */
127 public long getLastModified()
128 {
129 return file.lastModified();
130 }
131 }
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