| 1 | /* gnu.java.net.protocol.jar.Handler - jar protocol handler for java.net |
| 2 | Copyright (C) 1999, 2002, 2003, 2005 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Classpath. |
| 5 | |
| 6 | GNU Classpath is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GNU Classpath is distributed in the hope that it will be useful, but |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Classpath; see the file COPYING. If not, write to the |
| 18 | Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 19 | 02110-1301 USA. |
| 20 | |
| 21 | Linking this library statically or dynamically with other modules is |
| 22 | making a combined work based on this library. Thus, the terms and |
| 23 | conditions of the GNU General Public License cover the whole |
| 24 | combination. |
| 25 | |
| 26 | As a special exception, the copyright holders of this library give you |
| 27 | permission to link this library with independent modules to produce an |
| 28 | executable, regardless of the license terms of these independent |
| 29 | modules, and to copy and distribute the resulting executable under |
| 30 | terms of your choice, provided that you also meet, for each linked |
| 31 | independent module, the terms and conditions of the license of that |
| 32 | module. An independent module is a module which is not derived from |
| 33 | or based on this library. If you modify this library, you may extend |
| 34 | this exception to your version of the library, but you are not |
| 35 | obligated to do so. If you do not wish to do so, delete this |
| 36 | exception statement from your version. */ |
| 37 | |
| 38 | |
| 39 | package gnu.java.net.protocol.jar; |
| 40 | |
| 41 | import gnu.java.net.URLParseError; |
| 42 | |
| 43 | import java.io.IOException; |
| 44 | import java.net.MalformedURLException; |
| 45 | import java.net.URL; |
| 46 | import java.net.URLConnection; |
| 47 | import java.net.URLStreamHandler; |
| 48 | |
| 49 | /** |
| 50 | * @author Kresten Krab Thorup (krab@gnu.org) |
| 51 | */ |
| 52 | public class Handler extends URLStreamHandler |
| 53 | { |
| 54 | /** |
| 55 | * A do nothing constructor |
| 56 | */ |
| 57 | public Handler() |
| 58 | { |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * This method returs a new JarURLConnection for the specified URL |
| 63 | * |
| 64 | * @param url The URL to return a connection for |
| 65 | * |
| 66 | * @return The URLConnection |
| 67 | * |
| 68 | * @exception IOException If an error occurs |
| 69 | */ |
| 70 | protected URLConnection openConnection(URL url) throws IOException |
| 71 | { |
| 72 | return new Connection(url); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * This method overrides URLStreamHandler's for parsing url of protocol "jar" |
| 77 | * |
| 78 | * @param url The URL object in which to store the results |
| 79 | * @param url_string The String-ized URL to parse |
| 80 | * @param start The position in the string to start scanning from |
| 81 | * @param end The position in the string to stop scanning |
| 82 | */ |
| 83 | protected void parseURL (URL url, String url_string, int start, int end) |
| 84 | { |
| 85 | // This method does not throw an exception or return a value. Thus our |
| 86 | // strategy when we encounter an error in parsing is to return without |
| 87 | // doing anything. |
| 88 | String file = url.getFile(); |
| 89 | |
| 90 | if (!file.equals("")) |
| 91 | { //has context url |
| 92 | url_string = url_string.substring (start, end); |
| 93 | if (url_string.startsWith("/")) |
| 94 | { //url string is an absolute path |
| 95 | int idx = file.lastIndexOf ("!/"); |
| 96 | |
| 97 | if (idx < 0) |
| 98 | throw new URLParseError("no !/ in spec"); |
| 99 | |
| 100 | file = file.substring (0, idx + 1) + url_string; |
| 101 | } |
| 102 | else if (url_string.length() > 0) |
| 103 | { |
| 104 | int idx = file.lastIndexOf ("/"); |
| 105 | if (idx == -1) //context path is weird |
| 106 | file = "/" + url_string; |
| 107 | else if (idx == (file.length() - 1)) |
| 108 | //just concatenate two parts |
| 109 | file = file + url_string; |
| 110 | else |
| 111 | // according to Java API Documentation, here is a little different |
| 112 | // with URLStreamHandler.parseURL |
| 113 | // but JDK seems doesn't handle it well |
| 114 | file = file.substring(0, idx + 1) + url_string; |
| 115 | } |
| 116 | |
| 117 | setURL (url, "jar", url.getHost(), url.getPort(), file, null); |
| 118 | return; |
| 119 | } |
| 120 | |
| 121 | // Bunches of things should be true. Make sure. |
| 122 | if (end < start) |
| 123 | return; |
| 124 | if (end - start < 2) |
| 125 | return; |
| 126 | if (start > url_string.length()) |
| 127 | return; |
| 128 | |
| 129 | // Skip remains of protocol |
| 130 | url_string = url_string.substring (start, end); |
| 131 | |
| 132 | int jar_stop; |
| 133 | if ((jar_stop = url_string.indexOf("!/")) < 0) |
| 134 | throw new URLParseError("no !/ in spec"); |
| 135 | |
| 136 | try |
| 137 | { |
| 138 | new URL(url_string.substring (0, jar_stop)); |
| 139 | } |
| 140 | catch (MalformedURLException e) |
| 141 | { |
| 142 | throw new URLParseError("invalid inner URL: " + e.getMessage()); |
| 143 | } |
| 144 | |
| 145 | if (!url.getProtocol().equals ("jar") ) |
| 146 | throw new URLParseError("unexpected protocol " + url.getProtocol()); |
| 147 | |
| 148 | setURL (url, "jar", url.getHost(), url.getPort(), url_string, null); |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * This method converts a Jar URL object into a String. |
| 153 | * |
| 154 | * @param url The URL object to convert |
| 155 | */ |
| 156 | protected String toExternalForm (URL url) |
| 157 | { |
| 158 | String file = url.getFile(); |
| 159 | String ref = url.getRef(); |
| 160 | |
| 161 | // return "jar:" + file; |
| 162 | // Performance!!: |
| 163 | // Do the concatenation manually to avoid resize StringBuffer's |
| 164 | // internal buffer. The length of ref is not taken into consideration |
| 165 | // as it's a rare path. |
| 166 | StringBuffer sb = new StringBuffer (file.length() + 5); |
| 167 | sb.append ("jar:"); |
| 168 | sb.append (file); |
| 169 | if (ref != null) |
| 170 | sb.append('#').append(ref); |
| 171 | return sb.toString(); |
| 172 | } |
| 173 | } |