1 /*
   2  * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.security.tools;
  27 
  28 import java.io.File;
  29 import java.io.IOException;
  30 import java.lang.String;
  31 import java.util.StringTokenizer;
  32 import java.net.URL;
  33 import java.net.URLClassLoader;
  34 import java.net.MalformedURLException;
  35 
  36 /**
  37  * A utility class for handle path list
  38  *
  39  */
  40 public class PathList {
  41     /**
  42      * Utility method for appending path from pathFrom to pathTo.
  43      *
  44      * @param pathTo the target path
  45      * @param pathFrom the path to be appended to pathTo
  46      * @return the resulting path
  47      */
  48     public static String appendPath(String pathTo, String pathFrom) {
  49         if (pathTo == null || pathTo.length() == 0) {
  50             return pathFrom;
  51         } else if (pathFrom == null || pathFrom.length() == 0) {
  52             return pathTo;
  53         } else {
  54             return pathTo  + File.pathSeparator + pathFrom;
  55         }
  56     }
  57 
  58     /**
  59      * Utility method for converting a search path string to an array
  60      * of directory and JAR file URLs.
  61      *
  62      * @param path the search path string
  63      * @return the resulting array of directory and JAR file URLs
  64      */
  65     public static URL[] pathToURLs(String path) {
  66         StringTokenizer st = new StringTokenizer(path, File.pathSeparator);
  67         URL[] urls = new URL[st.countTokens()];
  68         int count = 0;
  69         while (st.hasMoreTokens()) {
  70             URL url = fileToURL(new File(st.nextToken()));
  71             if (url != null) {
  72                 urls[count++] = url;
  73             }
  74         }
  75         if (urls.length != count) {
  76             URL[] tmp = new URL[count];
  77             System.arraycopy(urls, 0, tmp, 0, count);
  78             urls = tmp;
  79         }
  80         return urls;
  81     }
  82 
  83     /**
  84      * Returns the directory or JAR file URL corresponding to the specified
  85      * local file name.
  86      *
  87      * @param file the File object
  88      * @return the resulting directory or JAR file URL, or null if unknown
  89      */
  90     private static URL fileToURL(File file) {
  91         String name;
  92         try {
  93             name = file.getCanonicalPath();
  94         } catch (IOException e) {
  95             name = file.getAbsolutePath();
  96         }
  97         name = name.replace(File.separatorChar, '/');
  98         if (!name.startsWith("/")) {
  99             name = "/" + name;
 100         }
 101         // If the file does not exist, then assume that it's a directory
 102         if (!file.isFile()) {
 103             name = name + "/";
 104         }
 105         try {
 106             return new URL("file", "", name);
 107         } catch (MalformedURLException e) {
 108             throw new IllegalArgumentException("file");
 109         }
 110     }
 111 }