1 /*
2 * #%L
3 * License Maven Plugin
4 * %%
5 * Copyright (C) 2010 - 2011 CodeLutin, Codehaus, Tony Chemit
6 * %%
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Lesser Public License for more details.
16 *
17 * You should have received a copy of the GNU General Lesser Public
18 * License along with this program. If not, see
19 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
20 * #L%
21 */
22 package org.codehaus.mojo.license;
23
24 import java.io.*;
25 import java.net.URL;
26 import java.net.URLConnection;
27
28 /**
29 * Utilities for downloading remote license files.
30 *
31 * @author pgier
32 * @since 1.0
33 */
34 public class LicenseDownloader
35 {
36
37 /**
38 * Defines the connection timeout in milliseconds when attempting to download license files.
39 */
40 public static final int DEFAULT_CONNECTION_TIMEOUT = 5000;
41
42 public static void downloadLicense( String licenseUrlString, File outputFile )
43 throws IOException
44 {
45 InputStream licenseInputStream = null;
46 FileOutputStream fos = null;
47
48 try
49 {
50 URL licenseUrl = new URL( licenseUrlString );
51 URLConnection connection = licenseUrl.openConnection();
52 connection.setConnectTimeout( DEFAULT_CONNECTION_TIMEOUT );
53 connection.setReadTimeout( DEFAULT_CONNECTION_TIMEOUT );
54 licenseInputStream = connection.getInputStream();
55 fos = new FileOutputStream( outputFile );
56 copyStream( licenseInputStream, fos );
57 licenseInputStream.close();
58 fos.close();
59 }
60 finally
61 {
62 FileUtil.tryClose( licenseInputStream );
63 FileUtil.tryClose( fos );
64 }
65
66 }
67
68 /**
69 * Copy data from one stream to another.
70 *
71 * @param inStream
72 * @param outStream
73 * @throws IOException
74 */
75 private static void copyStream( InputStream inStream, OutputStream outStream )
76 throws IOException
77 {
78 byte[] buf = new byte[1024];
79 int len;
80 while ( ( len = inStream.read( buf ) ) > 0 )
81 {
82 outStream.write( buf, 0, len );
83 }
84 }
85
86 }