1/*
2 * Copyright (C) 2008 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.internal.util;
18
19import junit.framework.TestCase;
20
21import java.util.ArrayList;
22import java.util.Collections;
23
24public class PredicatesTest extends TestCase {
25
26    private static final Predicate<Object> TRUE = new Predicate<Object>() {
27        public boolean apply(Object o) {
28            return true;
29        }
30    };
31
32    private static final Predicate<Object> FALSE = new Predicate<Object>() {
33        public boolean apply(Object o) {
34            return false;
35        }
36    };
37
38    public void testAndPredicate_AllConditionsTrue() throws Exception {
39        assertTrue(Predicates.and(newArrayList(TRUE)).apply(null));
40        assertTrue(Predicates.and(newArrayList(TRUE, TRUE)).apply(null));
41    }
42
43    public void testAndPredicate_AtLeastOneConditionIsFalse() throws Exception {
44        assertFalse(Predicates.and(newArrayList(FALSE, TRUE, TRUE)).apply(null));
45        assertFalse(Predicates.and(newArrayList(TRUE, FALSE, TRUE)).apply(null));
46        assertFalse(Predicates.and(newArrayList(TRUE, TRUE, FALSE)).apply(null));
47    }
48
49    public void testOrPredicate_AllConditionsTrue() throws Exception {
50        assertTrue(Predicates.or(newArrayList(TRUE, TRUE, TRUE)).apply(null));
51    }
52
53    public void testOrPredicate_AllConditionsFalse() throws Exception {
54        assertFalse(Predicates.or(newArrayList(FALSE, FALSE, FALSE)).apply(null));
55    }
56
57    public void testOrPredicate_AtLeastOneConditionIsTrue() throws Exception {
58        assertTrue(Predicates.or(newArrayList(TRUE, FALSE, FALSE)).apply(null));
59        assertTrue(Predicates.or(newArrayList(FALSE, TRUE, FALSE)).apply(null));
60        assertTrue(Predicates.or(newArrayList(FALSE, FALSE, TRUE)).apply(null));
61    }
62
63    public void testNotPredicate() throws Exception {
64        assertTrue(Predicates.not(FALSE).apply(null));
65        assertFalse(Predicates.not(TRUE).apply(null));
66    }
67
68    private static <E> ArrayList<E> newArrayList(E... elements) {
69        ArrayList<E> list = new ArrayList<E>();
70        Collections.addAll(list, elements);
71        return list;
72    }
73
74}
75