Framelet Prototype 2016 using Mojo IPC

components/framelet/browser/resource_usage_range.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_FRAMELET_BROWSER_RESOURCE_USAGE_RANGE_H_
+#define COMPONENTS_FRAMELET_BROWSER_RESOURCE_USAGE_RANGE_H_
+
+#include <algorithm>
+#include <limits>
+
+#include "base/macros.h"
+
+namespace framelet {
+
+enum class ResourceUsageRangeType { DEFAULT, LEFT_UNBOUNDED, RIGHT_UNBOUNDED };
+
+template <class T>
+class ResourceUsageRange {
+ public:
+  ResourceUsageRange(ResourceUsageRangeType range_type, T bounded_end)
+      : range_type_(range_type),
+        low_(range_type_ == ResourceUsageRangeType::LEFT_UNBOUNDED
+                 ? std::numeric_limits<T>::lowest()
+                 : bounded_end),
+        high_(range_type_ == ResourceUsageRangeType::RIGHT_UNBOUNDED
+                  ? std::numeric_limits<T>::max()
+                  : bounded_end) {}
+
+  ResourceUsageRange(T start, T end)
+      : range_type_(ResourceUsageRangeType::DEFAULT),
+        low_(std::min(start, end)),
+        high_(std::max(start, end)) {}
+
+  ~ResourceUsageRange() {}
+
+  T high() const { return high_; }
+  T low() const { return low_; }
+
+  bool IsLowerThan(T val) const {
+    if (range_type_ == ResourceUsageRangeType::RIGHT_UNBOUNDED)
+      return false;
+    return val > high_;
+  }
+
+  bool IsHigherThan(T val) const {
+    if (range_type_ == ResourceUsageRangeType::LEFT_UNBOUNDED)
+      return false;
+    return val < low_;
+  }
+
+  bool Contains(T val) const { return !IsLowerThan(val) && !IsHigherThan(val); }
+
+ private:
+  const ResourceUsageRangeType range_type_;
+  const T low_;
+  const T high_;
+  DISALLOW_COPY_AND_ASSIGN(ResourceUsageRange);
+};
+
+}  // namespace framelet
+
+#endif  // COMPONENTS_FRAMELET_BROWSER_RESOURCE_USAGE_RANGE_H_