MimePredicate.java revision a5599ef636e37cb0b6474349936999be1afe6987 
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 com.android.documentsui.model.Document;
20import com.android.internal.util.Predicate;
21
22public class MimePredicate implements Predicate<Document> {
23    private final String[] mFilters;
24
25    public MimePredicate(String[] filters) {
26        mFilters = filters;
27    }
28
29    @Override
30    public boolean apply(Document doc) {
31        if (doc.isDirectory()) {
32            return true;
33        }
34        for (String filter : mFilters) {
35            if (mimeMatches(filter, doc.mimeType)) {
36                return true;
37            }
38        }
39        return false;
40    }
41
42    public static boolean mimeMatches(String filter, String[] tests) {
43        for (String test : tests) {
44            if (mimeMatches(filter, test)) {
45                return true;
46            }
47        }
48        return false;
49    }
50
51    public static boolean mimeMatches(String filter, String test) {
52        if (test == null) {
53            return false;
54        } else if (filter.equals(test)) {
55            return true;
56        } else if ("*/*".equals(filter)) {
57            return true;
58        } else if (filter.endsWith("/*")) {
59            return filter.regionMatches(0, test, 0, filter.indexOf('/'));
60        } else {
61            return false;
62        }
63    }
64}
65