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
17package com.android.documentsui;
18
19import android.annotation.Nullable;
20import android.provider.DocumentsContract.Document;
21
22import com.android.documentsui.model.DocumentInfo;
23import com.android.internal.util.Predicate;
24
25public 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