1 /**
2  * Copyright © 2019 IBM Corporation
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 #pragma once
17 
18 #include "action.hpp"
19 #include "action_environment.hpp"
20 
21 #include <memory>
22 #include <string>
23 #include <utility>
24 #include <vector>
25 
26 namespace phosphor::power::regulators
27 {
28 
29 /**
30  * @class AndAction
31  *
32  * Executes a sequence of actions and tests whether all of them returned true.
33  *
34  * Implements the "and" action in the JSON config file.
35  */
36 class AndAction : public Action
37 {
38   public:
39     // Specify which compiler-generated methods we want
40     AndAction() = delete;
41     AndAction(const AndAction&) = delete;
42     AndAction(AndAction&&) = delete;
43     AndAction& operator=(const AndAction&) = delete;
44     AndAction& operator=(AndAction&&) = delete;
45     virtual ~AndAction() = default;
46 
47     /**
48      * Constructor.
49      *
50      * @param actions actions to execute
51      */
52     explicit AndAction(std::vector<std::unique_ptr<Action>> actions) :
53         actions{std::move(actions)}
54     {}
55 
56     /**
57      * Executes the actions specified in the constructor.
58      *
59      * Returns true if all of the actions returned true, otherwise returns
60      * false.
61      *
62      * Note: All of the actions will be executed even if an action before the
63      * end returns false.  This ensures that actions with beneficial
64      * side-effects are always executed, such as a register read that clears
65      * latched fault bits.
66      *
67      * Throws an exception if an error occurs and an action cannot be
68      * successfully executed.
69      *
70      * @param environment action execution environment
71      * @return true if all actions returned true, otherwise returns false
72      */
73     virtual bool execute(ActionEnvironment& environment) override
74     {
75         bool returnValue{true};
76         for (std::unique_ptr<Action>& action : actions)
77         {
78             if (action->execute(environment) == false)
79             {
80                 returnValue = false;
81             }
82         }
83         return returnValue;
84     }
85 
86     /**
87      * Returns the actions to execute.
88      *
89      * @return actions to execute
90      */
91     const std::vector<std::unique_ptr<Action>>& getActions() const
92     {
93         return actions;
94     }
95 
96     /**
97      * Returns a string description of this action.
98      *
99      * @return description of action
100      */
101     virtual std::string toString() const override
102     {
103         return "and: [ ... ]";
104     }
105 
106   private:
107     /**
108      * Actions to execute.
109      */
110     std::vector<std::unique_ptr<Action>> actions{};
111 };
112 
113 } // namespace phosphor::power::regulators
114