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diff --git a/src/optimize/RBAAllwaysCheckConstraintCollector.cpp b/src/optimize/RBAAllwaysCheckConstraintCollector.cpp
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+++ b/src/optimize/RBAAllwaysCheckConstraintCollector.cpp
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+/**
+ * Copyright (c) 2019 DENSO CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// RBAAllwaysCheckConstraintCollector.hpp
+//
+
+#include "RBAAllwaysCheckConstraintCollector.hpp"
+
+#include "RBAConstraintImpl.hpp"
+#include "RBAConstraintInfo.hpp"
+
+namespace rba
+{
+
+RBAAllwaysCheckConstraintCollector::RBAAllwaysCheckConstraintCollector(
+    RBAModelImpl* const model)
+    : RBAAbstractCollector{model}
+{
+}
+
+void RBAAllwaysCheckConstraintCollector::init(
+    const RBAConstraintImpl* const constraint)
+{
+  constraint_ = constraint;
+  isAllways_ = false;
+}
+
+bool RBAAllwaysCheckConstraintCollector::isAllways() const
+{
+  return isAllways_;
+}
+
+void RBAAllwaysCheckConstraintCollector::visit(RBAPreviousModifier& exp)
+{
+  isAllways_ = true;
+}
+
+} /* namespace rba */