/* GrandPerspective, Version 3.5.1 
 *   A utility for Mac OS X that graphically shows disk usage. 
 * Copyright (C) 2005-2022, Erwin Bonsma 
 * 
 * This program is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by the Free 
 * Software Foundation; either version 2 of the License, or (at your option) 
 * any later version. 
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
 * more details. 
 * 
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, write to the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA. 
 */

#import "PeekingEnumerator.h"


@implementation PeekingEnumerator

// Overrides super's designated initialiser.
- (instancetype) init {
  return [self initWithEnumerator:nil]; // nil value -> empty enumerator.
}

- (instancetype) initWithEnumerator:(NSEnumerator *)enumVal {
  if (self = [super init]) {
    enumerator = [enumVal retain];

    nextObject = [enumerator nextObject];
    // Not retaining it, as for efficiency we don't want to auto-release it. Freeing the object
    // while enumeration is ongoing simply a bug and should never happen.
  }
  return self;
}

- (void) dealloc {
  [enumerator release];
  
  [super dealloc];
}

- (id) nextObject {
  id  returnVal = nextObject;

  nextObject = [enumerator nextObject];
  
  return returnVal;
}

- (id) peekObject {
  return nextObject;
}

@end
