1 /*
2 * Copyright (C) 2017 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 #include "Log.h"
18
19 #include "condition_util.h"
20
21 #include "../matchers/matcher_util.h"
22 #include "ConditionTracker.h"
23 #include "frameworks/base/cmds/statsd/src/statsd_config.pb.h"
24 #include "stats_util.h"
25
26 namespace android {
27 namespace os {
28 namespace statsd {
29
30 using std::vector;
31
32
evaluateCombinationCondition(const std::vector<int> & children,const LogicalOperation & operation,const std::vector<ConditionState> & conditionCache)33 ConditionState evaluateCombinationCondition(const std::vector<int>& children,
34 const LogicalOperation& operation,
35 const std::vector<ConditionState>& conditionCache) {
36 ConditionState newCondition;
37
38 bool hasUnknown = false;
39 bool hasFalse = false;
40 bool hasTrue = false;
41
42 for (auto childIndex : children) {
43 ConditionState childState = conditionCache[childIndex];
44 if (childState == ConditionState::kUnknown) {
45 hasUnknown = true;
46 break;
47 }
48 if (childState == ConditionState::kFalse) {
49 hasFalse = true;
50 }
51 if (childState == ConditionState::kTrue) {
52 hasTrue = true;
53 }
54 }
55
56 // If any child condition is in unknown state, the condition is unknown too.
57 if (hasUnknown) {
58 return ConditionState::kUnknown;
59 }
60
61 switch (operation) {
62 case LogicalOperation::AND: {
63 newCondition = hasFalse ? ConditionState::kFalse : ConditionState::kTrue;
64 break;
65 }
66 case LogicalOperation::OR: {
67 newCondition = hasTrue ? ConditionState::kTrue : ConditionState::kFalse;
68 break;
69 }
70 case LogicalOperation::NOT:
71 newCondition = children.empty() ? ConditionState::kUnknown :
72 ((conditionCache[children[0]] == ConditionState::kFalse) ?
73 ConditionState::kTrue : ConditionState::kFalse);
74 break;
75 case LogicalOperation::NAND:
76 newCondition = hasFalse ? ConditionState::kTrue : ConditionState::kFalse;
77 break;
78 case LogicalOperation::NOR:
79 newCondition = hasTrue ? ConditionState::kFalse : ConditionState::kTrue;
80 break;
81 case LogicalOperation::LOGICAL_OPERATION_UNSPECIFIED:
82 newCondition = ConditionState::kFalse;
83 break;
84 }
85 return newCondition;
86 }
87
operator |(ConditionState l,ConditionState r)88 ConditionState operator|(ConditionState l, ConditionState r) {
89 return l >= r ? l : r;
90 }
91 } // namespace statsd
92 } // namespace os
93 } // namespace android
94