entity_base.h

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#pragma once
 
#include <string>
#include <cstdint>
#include "string_ref.h"
 
namespace esphome {
 
enum EntityCategory : uint8_t {
  ENTITY_CATEGORY_NONE = 0,
  ENTITY_CATEGORY_CONFIG = 1,
  ENTITY_CATEGORY_DIAGNOSTIC = 2,
};
 
// The generic Entity base class that provides an interface common to all Entities.
class EntityBase {
 public:
  // Get/set the name of this Entity
  const StringRef &get_name() const;
  void set_name(const char *name);
 
  // Get whether this Entity has its own name or it should use the device friendly_name.
  bool has_own_name() const { return this->flags_.has_own_name; }
 
  // Get the sanitized name of this Entity as an ID.
  std::string get_object_id() const;
  void set_object_id(const char *object_id);
 
  // Get the unique Object ID of this Entity
  uint32_t get_object_id_hash();
 
  // Get/set whether this Entity should be hidden outside ESPHome
  bool is_internal() const { return this->flags_.internal; }
  void set_internal(bool internal) { this->flags_.internal = internal; }
 
  // Check if this object is declared to be disabled by default.
  // That means that when the device gets added to Home Assistant (or other clients) it should
  // not be added to the default view by default, and a user action is necessary to manually add it.
  bool is_disabled_by_default() const { return this->flags_.disabled_by_default; }
  void set_disabled_by_default(bool disabled_by_default) { this->flags_.disabled_by_default = disabled_by_default; }
 
  // Get/set the entity category.
  EntityCategory get_entity_category() const { return static_cast<EntityCategory>(this->flags_.entity_category); }
  void set_entity_category(EntityCategory entity_category) {
    this->flags_.entity_category = static_cast<uint8_t>(entity_category);
  }
 
  // Get/set this entity's icon
  std::string get_icon() const;
  void set_icon(const char *icon);
 
  // Check if this entity has state
  bool has_state() const { return this->flags_.has_state; }
 
  // Set has_state - for components that need to manually set this
  void set_has_state(bool state) { this->flags_.has_state = state; }
 
 protected:
  virtual uint32_t hash_base() { return 0L; }
  void calc_object_id_();
 
  StringRef name_;
  const char *object_id_c_str_{nullptr};
  const char *icon_c_str_{nullptr};
  uint32_t object_id_hash_{};
 
  // Bit-packed flags to save memory (1 byte instead of 5)
  struct EntityFlags {
    uint8_t has_own_name : 1;
    uint8_t internal : 1;
    uint8_t disabled_by_default : 1;
    uint8_t has_state : 1;
    uint8_t entity_category : 2;  // Supports up to 4 categories
    uint8_t reserved : 2;         // Reserved for future use
  } flags_{};
};
 
class EntityBase_DeviceClass {  // NOLINT(readability-identifier-naming)
 public:
  std::string get_device_class();
  void set_device_class(const char *device_class);
 
 protected:
  const char *device_class_{nullptr};  
};
 
class EntityBase_UnitOfMeasurement {  // NOLINT(readability-identifier-naming)
 public:
  std::string get_unit_of_measurement();
  void set_unit_of_measurement(const char *unit_of_measurement);
 
 protected:
  const char *unit_of_measurement_{nullptr};  
};
 
}  // namespace esphome