1 /*
   2  * Copyright (c) 2004, 2018, 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.net.MalformedURLException;
  31 import java.net.URL;
  32 import java.nio.file.Paths;
  33 
  34 /**
  35  * A utility class for handle path list
  36  *
  37  */
  38 public class PathList {
  39     /**
  40      * Utility method for appending path from pathFrom to pathTo.
  41      *
  42      * @param pathTo the target path
  43      * @param pathFrom the path to be appended to pathTo
  44      * @return the resulting path
  45      */
  46     public static String appendPath(String pathTo, String pathFrom) {
  47         if (pathTo == null || pathTo.length() == 0) {
  48             return pathFrom;
  49         } else if (pathFrom == null || pathFrom.length() == 0) {
  50             return pathTo;
  51         } else {
  52             return pathTo  + File.pathSeparator + pathFrom;
  53         }
  54     }
  55 
  56     /**
  57      * Utility method for converting a search path string to an array
  58      * of directory and JAR file URLs.
  59      *
  60      * @param path the search path string
  61      * @return the resulting array of directory and JAR file URLs
  62      */
  63     public static URL[] pathToURLs(String path) {
  64         return Paths.pathToStrings(path)
  65                 .stream()
  66                 .map(s -> fileToURL(new File(s)))
  67                 .toArray(URL[]::new);
  68     }
  69 
  70     /**
  71      * Returns the directory or JAR file URL corresponding to the specified
  72      * local file name.
  73      *
  74      * @param file the File object
  75      * @return the resulting directory or JAR file URL, or null if unknown
  76      */
  77     private static URL fileToURL(File file) {
  78         String name;
  79         try {
  80             name = file.getCanonicalPath();
  81         } catch (IOException e) {
  82             name = file.getAbsolutePath();
  83         }
  84         name = name.replace(File.separatorChar, '/');
  85         if (!name.startsWith("/")) {
  86             name = "/" + name;
  87         }
  88         // If the file does not exist, then assume that it's a directory
  89         if (!file.isFile()) {
  90             name = name + "/";
  91         }
  92         try {
  93             return new URL("file", "", name);
  94         } catch (MalformedURLException e) {
  95             throw new IllegalArgumentException("file");
  96         }
  97     }
  98 }