| /* gnu.java.net.protocol.jar.Handler - jar protocol handler for java.net |
| Copyright (C) 1999, 2002, 2003, 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.net.protocol.jar; |
| |
| import gnu.java.net.URLParseError; |
| |
| import java.io.IOException; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.net.URLStreamHandler; |
| |
| /** |
| * @author Kresten Krab Thorup (krab@gnu.org) |
| */ |
| public class Handler extends URLStreamHandler |
| { |
| /** |
| * A do nothing constructor |
| */ |
| public Handler() |
| { |
| } |
| |
| /** |
| * This method returs a new JarURLConnection for the specified URL |
| * |
| * @param url The URL to return a connection for |
| * |
| * @return The URLConnection |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected URLConnection openConnection(URL url) throws IOException |
| { |
| return new Connection(url); |
| } |
| |
| /** |
| * This method overrides URLStreamHandler's for parsing url of protocol "jar" |
| * |
| * @param url The URL object in which to store the results |
| * @param url_string The String-ized URL to parse |
| * @param start The position in the string to start scanning from |
| * @param end The position in the string to stop scanning |
| */ |
| protected void parseURL (URL url, String url_string, int start, int end) |
| { |
| // This method does not throw an exception or return a value. Thus our |
| // strategy when we encounter an error in parsing is to return without |
| // doing anything. |
| String file = url.getFile(); |
| |
| if (!file.equals("")) |
| { //has context url |
| url_string = url_string.substring (start, end); |
| if (url_string.startsWith("/")) |
| { //url string is an absolute path |
| int idx = file.lastIndexOf ("!/"); |
| |
| if (idx < 0) |
| throw new URLParseError("no !/ in spec"); |
| |
| file = file.substring (0, idx + 1) + url_string; |
| } |
| else if (url_string.length() > 0) |
| { |
| int idx = file.lastIndexOf ("/"); |
| if (idx == -1) //context path is weird |
| file = "/" + url_string; |
| else if (idx == (file.length() - 1)) |
| //just concatenate two parts |
| file = file + url_string; |
| else |
| // according to Java API Documentation, here is a little different |
| // with URLStreamHandler.parseURL |
| // but JDK seems doesn't handle it well |
| file = file.substring(0, idx + 1) + url_string; |
| } |
| |
| setURL (url, "jar", url.getHost(), url.getPort(), file, null); |
| return; |
| } |
| |
| // Bunches of things should be true. Make sure. |
| if (end < start) |
| return; |
| if (end - start < 2) |
| return; |
| if (start > url_string.length()) |
| return; |
| |
| // Skip remains of protocol |
| url_string = url_string.substring (start, end); |
| |
| int jar_stop; |
| if ((jar_stop = url_string.indexOf("!/")) < 0) |
| throw new URLParseError("no !/ in spec"); |
| |
| try |
| { |
| new URL(url_string.substring (0, jar_stop)); |
| } |
| catch (MalformedURLException e) |
| { |
| throw new URLParseError("invalid inner URL: " + e.getMessage()); |
| } |
| |
| if (!url.getProtocol().equals ("jar") ) |
| throw new URLParseError("unexpected protocol " + url.getProtocol()); |
| |
| setURL (url, "jar", url.getHost(), url.getPort(), url_string, null); |
| } |
| |
| /** |
| * This method converts a Jar URL object into a String. |
| * |
| * @param url The URL object to convert |
| */ |
| protected String toExternalForm (URL url) |
| { |
| String file = url.getFile(); |
| String ref = url.getRef(); |
| |
| // return "jar:" + file; |
| // Performance!!: |
| // Do the concatenation manually to avoid resize StringBuffer's |
| // internal buffer. The length of ref is not taken into consideration |
| // as it's a rare path. |
| StringBuffer sb = new StringBuffer (file.length() + 5); |
| sb.append ("jar:"); |
| sb.append (file); |
| if (ref != null) |
| sb.append('#').append(ref); |
| return sb.toString(); |
| } |
| } |