1 package org.codehaus.mojo.exec;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.io.File;
23 import java.io.UnsupportedEncodingException;
24 import java.net.MalformedURLException;
25 import java.net.URL;
26 import java.util.BitSet;
27
28 /**
29 * Utility for dealing with URLs in pre-JDK 1.4.
30 */
31 public class UrlUtils
32 {
33 private static final BitSet UNRESERVED = new BitSet( Byte.MAX_VALUE - Byte.MIN_VALUE + 1 );
34
35 private static final int RADIX = 16;
36
37 private static final int MASK = 0xf;
38
39 private UrlUtils()
40 {
41 }
42
43 private static final String ENCODING = "UTF-8";
44
45 static
46 {
47 try
48 {
49 byte[] bytes =
50 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'():/".getBytes( ENCODING );
51 for ( int i = 0; i < bytes.length; i++ )
52 {
53 UNRESERVED.set( bytes[i] );
54 }
55 }
56 catch ( UnsupportedEncodingException e )
57 {
58 // can't happen as UTF-8 must be present
59 }
60 }
61
62 public static URL getURL( File file )
63 throws MalformedURLException
64 {
65 // with JDK 1.4+, code would be: return new URL( file.toURI().toASCIIString() );
66 URL url = file.toURL();
67 // encode any characters that do not comply with RFC 2396
68 // this is primarily to handle Windows where the user's home directory contains spaces
69 try
70 {
71 byte[] bytes = url.toString().getBytes( ENCODING );
72 StringBuffer buf = new StringBuffer( bytes.length );
73 for ( int i = 0; i < bytes.length; i++ )
74 {
75 byte b = bytes[i];
76 if ( b > 0 && UNRESERVED.get( b ) )
77 {
78 buf.append( (char) b );
79 }
80 else
81 {
82 buf.append( '%' );
83 buf.append( Character.forDigit( b >>> 4 & MASK, RADIX ) );
84 buf.append( Character.forDigit( b & MASK, RADIX ) );
85 }
86 }
87 return new URL( buf.toString() );
88 }
89 catch ( UnsupportedEncodingException e )
90 {
91 // should not happen as UTF-8 must be present
92 throw new RuntimeException( e );
93 }
94 }
95 }