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      1 /*
      2  * Copyright (C) 2013 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.documentsui;
     18 
     19 import android.annotation.Nullable;
     20 import android.provider.DocumentsContract.Document;
     21 
     22 import com.android.documentsui.model.DocumentInfo;
     23 import com.android.internal.util.Predicate;
     24 
     25 public class MimePredicate implements Predicate<DocumentInfo> {
     26     private final String[] mFilters;
     27 
     28     private static final String APK_TYPE = "application/vnd.android.package-archive";
     29     /**
     30      * MIME types that are visual in nature. For example, they should always be
     31      * shown as thumbnails in list mode.
     32      */
     33     public static final String[] VISUAL_MIMES = new String[] { "image/*", "video/*" };
     34 
     35     public MimePredicate(String[] filters) {
     36         mFilters = filters;
     37     }
     38 
     39     @Override
     40     public boolean apply(DocumentInfo doc) {
     41         if (doc.isDirectory()) {
     42             return true;
     43         }
     44         if (mimeMatches(mFilters, doc.mimeType)) {
     45             return true;
     46         }
     47         return false;
     48     }
     49 
     50     public static boolean mimeMatches(String[] filters, String[] tests) {
     51         if (tests == null) {
     52             return false;
     53         }
     54         for (String test : tests) {
     55             if (mimeMatches(filters, test)) {
     56                 return true;
     57             }
     58         }
     59         return false;
     60     }
     61 
     62     public static boolean mimeMatches(String filter, String[] tests) {
     63         if (tests == null) {
     64             return true;
     65         }
     66         for (String test : tests) {
     67             if (mimeMatches(filter, test)) {
     68                 return true;
     69             }
     70         }
     71         return false;
     72     }
     73 
     74     public static boolean mimeMatches(String[] filters, String test) {
     75         if (filters == null) {
     76             return true;
     77         }
     78         for (String filter : filters) {
     79             if (mimeMatches(filter, test)) {
     80                 return true;
     81             }
     82         }
     83         return false;
     84     }
     85 
     86     public static boolean mimeMatches(String filter, String test) {
     87         if (test == null) {
     88             return false;
     89         } else if (filter == null || "*/*".equals(filter)) {
     90             return true;
     91         } else if (filter.equals(test)) {
     92             return true;
     93         } else if (filter.endsWith("/*")) {
     94             return filter.regionMatches(0, test, 0, filter.indexOf('/'));
     95         } else {
     96             return false;
     97         }
     98     }
     99 
    100     public static boolean isApkType(@Nullable String mimeType) {
    101         return APK_TYPE.equals(mimeType);
    102     }
    103 
    104     public static boolean isDirectoryType(@Nullable String mimeType) {
    105         return Document.MIME_TYPE_DIR.equals(mimeType);
    106     }
    107 }
    108