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cscore/src/main/native/cpp/Handle.hpp

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+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#ifndef CSCORE_HANDLE_H_
+#define CSCORE_HANDLE_H_
+
+#include <wpi/Synchronization.h>
+
+#include "cscore_c.h"
+
+namespace cs {
+
+// Handle data layout:
+// Bits 0-15:  Handle index
+// Bits 16-23: Parent index (property only)
+// Bits 24-30: Type
+
+class Handle {
+ public:
+  enum Type {
+    kUndefined = 0,
+    kProperty = wpi::kHandleTypeCSBase,
+    kSource,
+    kSink,
+    kListener,
+    kSinkProperty,
+    kListenerPoller
+  };
+  enum { kIndexMax = 0xffff };
+
+  Handle(CS_Handle handle) : m_handle(handle) {}  // NOLINT
+  operator CS_Handle() const { return m_handle; }
+
+  Handle(int index, Type type) {
+    if (index < 0) {
+      m_handle = 0;
+      return;
+    }
+    m_handle = ((static_cast<int>(type) & 0x7f) << 24) | (index & 0xffff);
+  }
+  Handle(int index, int property, Type type) {
+    if (index < 0 || property < 0) {
+      m_handle = 0;
+      return;
+    }
+    m_handle = ((static_cast<int>(type) & 0x7f) << 24) |
+               ((index & 0xff) << 16) | (property & 0xffff);
+  }
+
+  int GetIndex() const { return static_cast<int>(m_handle) & 0xffff; }
+  Type GetType() const {
+    return static_cast<Type>((static_cast<int>(m_handle) >> 24) & 0xff);
+  }
+  bool IsType(Type type) const { return type == GetType(); }
+  int GetTypedIndex(Type type) const { return IsType(type) ? GetIndex() : -1; }
+  int GetParentIndex() const {
+    return (IsType(Handle::kProperty) || IsType(Handle::kSinkProperty))
+               ? (static_cast<int>(m_handle) >> 16) & 0xff
+               : -1;
+  }
+
+ private:
+  CS_Handle m_handle;
+};
+
+}  // namespace cs
+
+#endif  // CSCORE_HANDLE_H_