1/*
2 * Copyright (C) 2009 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.quicksearchbox.util;
18
19import android.content.ContentResolver;
20import android.content.Context;
21import android.content.pm.ApplicationInfo;
22import android.content.pm.PackageManager;
23import android.content.res.Resources;
24import android.net.Uri;
25import android.util.Log;
26
27import java.util.HashSet;
28import java.util.List;
29import java.util.Set;
30
31/**
32 * General utilities.
33 */
34public class Util {
35
36    private static final String TAG = "QSB.Util";
37
38    public static <A> Set<A> setOfFirstN(List<A> list, int n) {
39        int end = Math.min(list.size(), n);
40        HashSet<A> set = new HashSet<A>(end);
41        for (int i = 0; i < end; i++) {
42            set.add(list.get(i));
43        }
44        return set;
45    }
46
47    public static Uri getResourceUri(Context packageContext, int res) {
48        try {
49            Resources resources = packageContext.getResources();
50            return getResourceUri(resources, packageContext.getPackageName(), res);
51        } catch (Resources.NotFoundException e) {
52            Log.e(TAG, "Resource not found: " + res + " in " + packageContext.getPackageName());
53            return null;
54        }
55    }
56
57    public static Uri getResourceUri(Context context, ApplicationInfo appInfo, int res) {
58        try {
59            Resources resources = context.getPackageManager().getResourcesForApplication(appInfo);
60            return getResourceUri(resources, appInfo.packageName, res);
61        } catch (PackageManager.NameNotFoundException e) {
62            Log.e(TAG, "Resources not found for " + appInfo.packageName);
63            return null;
64        } catch (Resources.NotFoundException e) {
65            Log.e(TAG, "Resource not found: " + res + " in " + appInfo.packageName);
66            return null;
67        }
68    }
69
70    private static Uri getResourceUri(Resources resources, String appPkg, int res)
71            throws Resources.NotFoundException {
72        String resPkg = resources.getResourcePackageName(res);
73        String type = resources.getResourceTypeName(res);
74        String name = resources.getResourceEntryName(res);
75        return makeResourceUri(appPkg, resPkg, type, name);
76    }
77
78    private static Uri makeResourceUri(String appPkg, String resPkg, String type, String name) {
79        Uri.Builder uriBuilder = new Uri.Builder();
80        uriBuilder.scheme(ContentResolver.SCHEME_ANDROID_RESOURCE);
81        uriBuilder.encodedAuthority(appPkg);
82        uriBuilder.appendEncodedPath(type);
83        if (!appPkg.equals(resPkg)) {
84            uriBuilder.appendEncodedPath(resPkg + ":" + name);
85        } else {
86            uriBuilder.appendEncodedPath(name);
87        }
88        return uriBuilder.build();
89    }
90}
91