1 /*

     2  * Copyright (c) 2004, 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.util;

    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 pathSource 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 }