/*!
  @header ECXMLControlDefaultAllocator
  @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

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

#include <Encore/ECXMLControlDefaultAllocatorRule.h>
#include <Encore/ECMemory.h>
#include <Encore/ECExceptions.h>


@implementation ECXMLControlDefaultAllocatorRule

- (BOOL) mayActOn: (ECXMLControlContext *) aContext {
 return [[[aContext event] eventId] 
   isEqual: [ECXMLControlEvent eventId_elementStarted]];
}


- (BOOL) actOn: (ECXMLControlContext *) aContext {
  NSMutableDictionary *attributes;
  Class classObject = nil;
  
  NSAssert( [[[aContext event] eventId] 
   isEqual: [ECXMLControlEvent eventId_elementStarted]],
   @"ECXMLControlDefaultAllocatorRule::actOn: May only react on \"start "\
     "element\" events." );
  
  EC_AUTORELEASEPOOL_BEGIN
  /* look for attribute class */
  attributes = [[aContext event] attributes];
  
  if( nil != attributes ) {
    NSString *classname = [attributes objectForKey: __CLASS_ATTRIBUTE];
    
    if( nil != classname ) {
      [attributes removeObjectForKey: classname];
      
      // try to fetch the class object whose name equals "classname"
      classObject = NSClassFromString( classname );
    }
  }
  
  if( nil == classObject ) {
    // now try to get the 
    classObject = NSClassFromString( [[aContext event] elementName] );
  }
  
  if( nil != classObject ) {
    id userObject = [[[classObject alloc] init] autorelease];
    [[aContext state] pushUserObject: userObject];
  } else {
    [[[ECIllegalArgumentException alloc] 
      initWithArgumentInfo: [[[NSString alloc] 
        initWithFormat: @"ECXMLControlDefaultAllocatorRule::actOn:"\
        " Unable to find class for %@", [[aContext event] elementName]]
        autorelease]]
      raise];
  }
  
  EC_AUTORELEASEPOOL_END

  return YES;
}

@end
