/simpletypesystem/trunk

/*
Copyright (c) 2013-2014 Gustav Hartvigsson

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#include "baseobject.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>


/* ---------------------------
 * Concrete method definitions
 * These are implemented towards the end of this file.
 * ---------------------------
 */

// SBaseObjectInstance * method_base_init (SBaseObjectInstance * self);

void method_base_deinit (SBaseObjectInstance * self);

int method_base_ref (SBaseObjectInstance * self);

int method_base_unref (SBaseObjectInstance * self);

int method_base_get_refcount (SBaseObjectInstance * self);

char * method_base_to_string (SBaseObjectInstance * self);

/* -----------------
 * Helper functions...
 * -----------------
 */
/**
 * This function is used to set the method to initize a new instance of an
 * object.
 */
void s_base_object_set_init_method (SBaseObjectInstance * self, SBaseObjectInstance * (* method)(* SBaseObjectInstance)) {
  SBaseObjectClass * klass = s_base_object_get_class (self);
  klass->initize = method;
}


/**
 * This function is used to set the method to deinitize an object.
 * 
 * set it to a method that deinitize your object.
 */
void s_base_object_set_deinit_method (SBaseObjectInstance * self, void (* method)(SBaseObjectInstance *)) {
  SBaseObjectClass * klass = s_base_object_get_class (self);
  klass->deinitize = method;
} 

/**
 * This fuction is used to set the ref method.
 * 
 * DO NOT USE THIS UNLESS YOU KNOW WHAT YOU ARE DOING.
 */
void s_base_object_set_ref_method (SBaseObjectInstance * self, int (* method)(SBaseObjectInstance *)) {
  SBaseObjectClass * klass = s_base_object_get_class (self);
  klass->ref = method;
}

/**
 * This fuction is used to set the unref method.
 * 
 * DO NOT USE THIS UNLESS YOU KNOW WHAT YOU ARE DOING.
 */
void s_base_object_set_unref_method (SBaseObjectInstance * self, int (* method)(SBaseObjectInstance *)) {
  SBaseObjectClass * klass = s_base_object_get_class (self);
  klass->unref = method;
}

/**
 * This fuction is used to set the get_refcount method.
 * 
 * DO NOT USE THIS UNLESS YOU KNOW WHAT YOU ARE DOING.
 */
void s_base_object_set_get_refcount_method (SBaseObjectInstance * self, int (* method)(SBaseObjectInstance *)) {
  SBaseObjectClass * klass = s_base_object_get_class (self);
  klass->get_refcount = method;
}

/**
 * This fuction is used to set the to_string method.
 */
void s_base_object_set_to_string_method (SBaseObjectInstance * self, char * (*method)(SBaseObjectInstance *)) {
  SBaseObjectClass * klass = s_base_object_get_class (self);
  klass->to_string = method;
}

/* ----------------------
 * Base object functions.
 * ----------------------
 */

/**
 * This function initizes an intance of the BaseObject, it also sets the methods
 * to be used with the object and sets the refrence count to one.
 */
void s_base_object_initize (SBaseObjectInstance * self) {
  self->refcount = 1;
  // s_base_object_set_init_method (self, method_base_init);
  s_base_object_set_deinit_method (self, method_base_deinit);
  s_base_object_set_ref_method (self, method_base_ref);
  s_base_object_set_unref_method (self, method_base_unref);
  s_base_object_set_get_refcount_method (self, method_base_get_refcount);
  s_base_object_set_to_string_method (self, method_base_to_string);
}

/**
 * This function creates a new base object.
 */
SBaseObjectInstance * s_base_object_new () {
  SBaseObjectInstance * self = malloc (sizeof (SBaseObjectInstance));
  //allocate the class definition of the object.
  self->base_class = malloc (sizeof(SBaseObjectClass));
  //initize it.
  s_base_object_initize (self);
  return self;
}

/**
 * This function deinitizes/frees an object even if it is still referenced.
 * This is usualy a bad idea, use s_base_object_unref instead.
 */
void s_base_object_free (SBaseObjectInstance * self) {
  SBaseObjectClass * klass = s_base_object_get_class (self);
  klass->deinitize (self);
}

/**
 * This function gets the class (which hold the object methods).
 */
void * s_base_object_get_class (SBaseObjectInstance * self) {
  return self->base_class;
}

/**
 * This function sets the instance class of an object.
 */
void s_base_object_set_class (SBaseObjectInstance * self, SBaseObjectClass * klass) {
  self->base_class = klass;
}

/**
 * This function is used to decrese the reference count of an object.
 * When an object reaches zero, it will deinitize the object using the objects
 * deititize method.
 * 
 * It returns the current reference count.
 */
int s_base_object_unref (SBaseObjectInstance * self) {
  unsigned int ret = self->base_class->unref (self);
  return ret;
}

/**
 * This function is used to increse the reference count of an object.
 *
 * Returns the current reference count.
 */
int s_base_object_ref (SBaseObjectInstance * self) {
  unsigned int ret = self->base_class->ref (self);
  return ret;
}

/**
 * This function returns the current reference count without chaning it.
 */
int s_base_object_get_refcount (SBaseObjectInstance * self) {
  unsigned int ret = self->base_class->get_refcount (self);
  return ret;
}

/**
 * This function returns a textual (string) that represesnts the object.
 * The method can be set using s_base_object_set_to_string_method.
 *
 * Note: The string that is returned must be freed.
 */
char * s_base_object_to_string (SBaseObjectInstance * self) {
  char * ret = self->base_class->to_string (self);
  return ret;
}

/* -----------------
 * Contrete methods.
 * -----------------
 */
 
 
// SBaseObjectInstance * method_base_init (SBaseObjectInstance * self) { }

void method_base_deinit (SBaseObjectInstance * self) {
  free (self->base_class);
  free (self);
}

int method_base_ref (SBaseObjectInstance * self) {
  self->refcount = self->refcount + 1;
  return self->refcount;
}

int method_base_unref (SBaseObjectInstance * self) {
  self->refcount = self->refcount - 1;
  if (self->refcount == 0) {
    self->base_class->deinitize (self);
    return 0;
  }
  return self->refcount;
}

int method_base_get_refcount (SBaseObjectInstance * self) {
  return self->refcount;
}

char * method_base_to_string (SBaseObjectInstance * self) {
  char * ret_string = malloc (sizeof (char) * 32); // I am bad with maths..
  sprintf (ret_string, "References: %d ", self->base_class->get_refcount(self));
  return ret_string;
}