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 MimePredicate(String[] filters)35 public MimePredicate(String[] filters) { 36 mFilters = filters; 37 } 38 39 @Override apply(DocumentInfo doc)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 mimeMatches(String[] filters, String[] tests)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 mimeMatches(String filter, String[] tests)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 mimeMatches(String[] filters, String test)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 mimeMatches(String filter, String test)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 isApkType(@ullable String mimeType)100 public static boolean isApkType(@Nullable String mimeType) { 101 return APK_TYPE.equals(mimeType); 102 } 103 isDirectoryType(@ullable String mimeType)104 public static boolean isDirectoryType(@Nullable String mimeType) { 105 return Document.MIME_TYPE_DIR.equals(mimeType); 106 } 107 } 108