//
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// Copyright (C) 2014 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef UPDATE_ENGINE_UPDATE_MANAGER_FAKE_VARIABLE_H_
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#define UPDATE_ENGINE_UPDATE_MANAGER_FAKE_VARIABLE_H_
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#include <memory>
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#include <string>
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#include "update_engine/update_manager/variable.h"
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namespace chromeos_update_manager {
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// A fake typed variable to use while testing policy implementations. The
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// variable can be instructed to return any object of its type.
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template <typename T>
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class FakeVariable : public Variable<T> {
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public:
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FakeVariable(const std::string& name, VariableMode mode)
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: Variable<T>(name, mode) {}
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FakeVariable(const std::string& name, base::TimeDelta poll_interval)
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: Variable<T>(name, poll_interval) {}
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~FakeVariable() override {}
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// Sets the next value of this variable to the passed |p_value| pointer. Once
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// returned by GetValue(), the pointer is released and has to be set again.
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// A value of null means that the GetValue() call will fail and return
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// null.
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void reset(const T* p_value) { ptr_.reset(p_value); }
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// Make the NotifyValueChanged() public for FakeVariables.
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void NotifyValueChanged() { Variable<T>::NotifyValueChanged(); }
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protected:
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// Variable<T> overrides.
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// Returns the pointer set with reset(). The ownership of the object is passed
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// to the caller and the pointer is release from the FakeVariable. A second
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// call to GetValue() without reset() will return null and set the error
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// message.
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const T* GetValue(base::TimeDelta /* timeout */,
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std::string* errmsg) override {
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if (ptr_ == nullptr && errmsg != nullptr)
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*errmsg = this->GetName() + " is an empty FakeVariable";
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// Passes the pointer ownership to the caller.
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return ptr_.release();
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}
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private:
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// The pointer returned by GetValue().
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std::unique_ptr<const T> ptr_;
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DISALLOW_COPY_AND_ASSIGN(FakeVariable);
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};
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} // namespace chromeos_update_manager
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#endif // UPDATE_ENGINE_UPDATE_MANAGER_FAKE_VARIABLE_H_
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