eggObject.cxx

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file eggObject.cxx
 * @author drose
 * @date 1999-01-17
 */

#include "eggObject.h"

TypeHandle EggObject::_type_handle;


/**
 *
 */
EggObject::
EggObject() {
}


/**
 *
 */
EggObject::
EggObject(const EggObject &copy) :
  TypedReferenceCount(copy),
  _user_data(copy._user_data),
  _default_user_data(copy._default_user_data)
{
}


/**
 *
 */
EggObject &EggObject::
operator = (const EggObject &copy) {
  TypedReferenceCount::operator = (copy);
  _user_data = copy._user_data;
  _default_user_data = copy._default_user_data;
  return *this;
}

/**
 *
 */
EggObject::
~EggObject() {
}

/**
 * Sets the user data associated with this object.  This may be any
 * EggUserData-derived object.  The egg library will do nothing with this
 * pointer, except to hold its reference count and return the pointer on
 * request.
 *
 * The EggObject maintains multiple different EggUserData pointers, one for
 * each unique type (as reported by get_type()).  If you know that only one
 * type of EggUserData object will be added in your application, you may use
 * the query functions that accept no parameters, but it is recommended that
 * in general you pass in the type of your particular user data, to allow
 * multiple applications to coexist in the same egg data.
 *
 * This pointer is also copied by the copy assignment operator and copy
 * constructor.
 */
void EggObject::
set_user_data(EggUserData *user_data) {
  _user_data[user_data->get_type()] = user_data;
  _default_user_data = user_data;
}

/**
 * Returns the user data pointer most recently stored on this object, or NULL
 * if nothing was previously stored.
 */
EggUserData *EggObject::
get_user_data() const {
  return _default_user_data;
}

/**
 * Returns the user data pointer of the indicated type, if it exists, or NULL
 * if it does not.
 */
EggUserData *EggObject::
get_user_data(TypeHandle type) const {
  UserData::const_iterator ui;
  ui = _user_data.find(type);
  if (ui != _user_data.end()) {
    return (*ui).second;
  }
  return nullptr;
}

/**
 * Returns true if a generic user data pointer has recently been set and not
 * yet cleared, false otherwise.
 */
bool EggObject::
has_user_data() const {
  return !_default_user_data.is_null();
}

/**
 * Returns true if the user data pointer of the indicated type has been set,
 * false otherwise.
 */
bool EggObject::
has_user_data(TypeHandle type) const {
  UserData::const_iterator ui;
  ui = _user_data.find(type);
  return (ui != _user_data.end());
}

/**
 * Removes *all* user data pointers from the node.
 */
void EggObject::
clear_user_data() {
  _user_data.clear();
  _default_user_data.clear();
}

/**
 * Removes the user data pointer of the indicated type.
 */
void EggObject::
clear_user_data(TypeHandle type) {
  UserData::iterator ui;
  ui = _user_data.find(type);
  if (ui != _user_data.end()) {
    if ((*ui).second == _default_user_data) {
      _default_user_data.clear();
    }
    _user_data.erase(ui);
  }
}

/**
 * Returns this object cross-cast to an EggTransform pointer, if it inherits
 * from EggTransform, or NULL if it does not.
 */
EggTransform *EggObject::
as_transform() {
  return nullptr;
}