/*!
  @header ECEnumeratorIterator
  @abstract Module of Encore
 
  @availability OS X, GNUstep
  @copyright 2004, 2005, 2006 Oliver Langer

  Author: Oliver Langer

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA

  <pre>
  -------------------------------------------------------------------------
  Modification history

  19.07.06 ola     initial version
  22.08.06 ola     license changed
  -------------------------------------------------------------------------
  </pre>
*/

#include <Encore/ECEnumeratorIterator.h>

@implementation ECEnumeratorIterator

- initWithEnumerator: (NSEnumerator *) anEnumerator {
  self = [super init];
  self->enumerator = [anEnumerator retain];
  self->nextObject = nil;
  self->lock = [[NSLock alloc] init];
  
  return self;
}


- (void) dealloc {
  [self->enumerator release];
  [self->nextObject release];
  [self->lock release];
  
  [super dealloc];
}


- (BOOL) hasNext {
  [self->lock lock];
  
  NS_DURING
    if( nil == self->nextObject ) {
      nextObject = [self->enumerator nextObject];
    }
  NS_HANDLER
    [self->lock unlock];
    [localException raise];
  NS_ENDHANDLER
  
  [self->lock unlock];
  
  return (nil != self->nextObject);
}


- next {
  id toReturn = nil;
  
  if( [self hasNext] ) {
    toReturn = self->nextObject;
    self->nextObject = nil;
  }
  
  return toReturn;
}

@end
