| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.documentsui.base; |
| |
| import android.annotation.Nullable; |
| import android.provider.DocumentsContract.Document; |
| |
| import java.util.List; |
| |
| public final class MimeTypes { |
| |
| private MimeTypes() {} |
| |
| private static final String APK_TYPE = "application/vnd.android.package-archive"; |
| /** |
| * MIME types that are visual in nature. For example, they should always be |
| * shown as thumbnails in list mode. |
| */ |
| public static final String[] VISUAL_MIMES = new String[] { "image/*", "video/*" }; |
| |
| public static String findCommonMimeType(List<String> mimeTypes) { |
| String[] commonType = mimeTypes.get(0).split("/"); |
| if (commonType.length != 2) { |
| return "*/*"; |
| } |
| |
| for (int i = 1; i < mimeTypes.size(); i++) { |
| String[] type = mimeTypes.get(i).split("/"); |
| if (type.length != 2) continue; |
| |
| if (!commonType[1].equals(type[1])) { |
| commonType[1] = "*"; |
| } |
| |
| if (!commonType[0].equals(type[0])) { |
| commonType[0] = "*"; |
| commonType[1] = "*"; |
| break; |
| } |
| } |
| |
| return commonType[0] + "/" + commonType[1]; |
| } |
| |
| public static boolean mimeMatches(String[] filters, String[] tests) { |
| if (tests == null) { |
| return false; |
| } |
| for (String test : tests) { |
| if (mimeMatches(filters, test)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public static boolean mimeMatches(String filter, String[] tests) { |
| if (tests == null) { |
| return true; |
| } |
| for (String test : tests) { |
| if (mimeMatches(filter, test)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public static boolean mimeMatches(String[] filters, String test) { |
| if (filters == null) { |
| return true; |
| } |
| for (String filter : filters) { |
| if (mimeMatches(filter, test)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public static boolean mimeMatches(String filter, String test) { |
| if (test == null) { |
| return false; |
| } else if (filter == null || "*/*".equals(filter)) { |
| return true; |
| } else if (filter.equals(test)) { |
| return true; |
| } else if (filter.endsWith("/*")) { |
| return filter.regionMatches(0, test, 0, filter.indexOf('/')); |
| } else { |
| return false; |
| } |
| } |
| |
| public static boolean isApkType(@Nullable String mimeType) { |
| return APK_TYPE.equals(mimeType); |
| } |
| |
| public static boolean isDirectoryType(@Nullable String mimeType) { |
| return Document.MIME_TYPE_DIR.equals(mimeType); |
| } |
| } |