1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.inputmethod.latin.maketext;
18
19import java.io.IOException;
20import java.io.InputStream;
21import java.io.UnsupportedEncodingException;
22import java.net.URL;
23import java.net.URLDecoder;
24import java.util.ArrayList;
25import java.util.Enumeration;
26import java.util.jar.JarEntry;
27import java.util.jar.JarFile;
28
29public final class JarUtils {
30    private JarUtils() {
31        // This utility class is not publicly instantiable.
32    }
33
34    public static JarFile getJarFile(final Class<?> mainClass) {
35        final String mainClassPath = "/" + mainClass.getName().replace('.', '/') + ".class";
36        final URL resUrl = mainClass.getResource(mainClassPath);
37        if (!resUrl.getProtocol().equals("jar")) {
38            throw new RuntimeException("Should run as jar");
39        }
40        final String path = resUrl.getPath();
41        if (!path.startsWith("file:")) {
42            throw new RuntimeException("Unknown jar path: " + path);
43        }
44        final String jarPath = path.substring("file:".length(), path.indexOf('!'));
45        try {
46            return new JarFile(URLDecoder.decode(jarPath, "UTF-8"));
47        } catch (UnsupportedEncodingException e) {
48        } catch (IOException e) {
49        }
50        return null;
51    }
52
53    public static InputStream openResource(final String name) {
54        return JarUtils.class.getResourceAsStream("/" + name);
55    }
56
57    public interface JarFilter {
58        public boolean accept(String dirName, String name);
59    }
60
61    public static ArrayList<String> getNameListing(final JarFile jar, final JarFilter filter) {
62        final ArrayList<String> result = new ArrayList<String>();
63        final Enumeration<JarEntry> entries = jar.entries();
64        while (entries.hasMoreElements()) {
65            final JarEntry entry = entries.nextElement();
66            final String path = entry.getName();
67            final int pos = path.lastIndexOf('/');
68            final String dirName = (pos >= 0) ? path.substring(0, pos) : "";
69            final String name = (pos >= 0) ? path.substring(pos + 1) : path;
70            if (filter.accept(dirName, name)) {
71                result.add(path);
72            }
73        }
74        return result;
75    }
76
77    public static ArrayList<String> getNameListing(final JarFile jar, final String filterName) {
78        return getNameListing(jar, new JarFilter() {
79            @Override
80            public boolean accept(final String dirName, final String name) {
81                return name.equals(filterName);
82            }
83        });
84    }
85}
86