Error.c

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/*
 * Objectively: Ultra-lightweight object oriented framework for GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
 
#include "Error.h"
#include "Hash.h"
#include "String.h"
 
#define _Class _Error
 
#pragma mark - Object
 
static Object *copy(const Object *self) {
 
  Error *this = (Error *) self;
  Error *that = $(alloc(Error), initWithDomain, this->domain, this->code, this->message);
 
  return (Object *) that;
}
 
static void dealloc(Object *self) {
 
  Error *this = (Error *) self;
 
  release(this->domain);
  release(this->message);
 
  super(Object, self, dealloc);
}
 
static String *description(const Object *self) {
 
  Error *this = (Error *) self;
 
  String *desc = $(alloc(String), init);
 
  $(desc, appendFormat, "%ls: %d", this->domain->chars, this->code);
 
  if (this->message) {
    $(desc, appendFormat, ": %ls", this->message->chars);
  }
 
  return (String *) desc;
}
 
static int hash(const Object *self) {
 
  Error *this = (Error *) self;
 
  int hash = HASH_SEED;
 
  hash = HashForInteger(hash, this->code);
  hash = HashForObject(hash, this->domain);
  hash = HashForObject(hash, this->message);
 
  return hash;
}
 
static bool isEqual(const Object *self, const Object *other) {
 
  if (super(Object, self, isEqual, other)) {
    return true;
  }
 
  if (other && (self->clazz == other->clazz)) {
 
    const Error *this = (Error *) self;
    const Error *that = (Error *) other;
 
    if (this->code == that->code) {
 
      if ($((Object * ) this->domain, isEqual, (Object * ) that->domain)) {
 
        if (this->message) {
          return $((Object * ) this->message, isEqual, (Object * ) that->message);
        }
 
        return that->message == NULL;
      }
    }
  }
 
  return false;
}
 
#pragma mark - Error
 
static Error *initWithDomain(Error *self, String *domain, int code, String *message) {
 
  assert(domain);
 
  self = (Error *) super(Object, self, init);
  if (self) {
 
    self->domain = retain(domain);
    self->code = code;
 
    if (message) {
      self->message = retain(message);
    }
  }
 
  return self;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->copy = copy;
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
  ((ObjectInterface *) clazz->interface)->description = description;
  ((ObjectInterface *) clazz->interface)->hash = hash;
  ((ObjectInterface *) clazz->interface)->isEqual = isEqual;
 
  ((ErrorInterface *) clazz->interface)->initWithDomain = initWithDomain;
}
 
Class *_Error(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "Error",
      .superclass = _Object(),
      .instanceSize = sizeof(Error),
      .interfaceOffset = offsetof(Error, interface),
      .interfaceSize = sizeof(ErrorInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class