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
26package sun.security.tools;
27
28import java.io.File;
29import java.io.IOException;
30import java.lang.String;
31import java.util.StringTokenizer;
32import java.net.URL;
33import java.net.URLClassLoader;
34import java.net.MalformedURLException;
35
36/**
37 * A utility class for handle path list
38 *
39 */
40public 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}
112