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      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 
     17 package com.android.quicksearchbox.util;
     18 
     19 import android.content.ContentResolver;
     20 import android.content.Context;
     21 import android.content.pm.ApplicationInfo;
     22 import android.content.pm.PackageManager;
     23 import android.content.res.Resources;
     24 import android.net.Uri;
     25 import android.util.Log;
     26 
     27 import java.util.HashSet;
     28 import java.util.List;
     29 import java.util.Set;
     30 
     31 /**
     32  * General utilities.
     33  */
     34 public 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