/*!
  @header ECXMLControlReferenceRule
  @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

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

#include <Encore/ECXMLControlReferenceRule.h>
#include <Encore/ECMemory.h>
#include <Encore/ECExceptions.h>
#include <Encore/ECStringUtils.h>

@implementation ECXMLControlReferenceRule

- init {
  self = [super init];
  self->setterLookupUtil = [[ECXMLControlSetterLookupUtil alloc] init];
  
  return self;
}


- (void) dealloc {
  [self->setterLookupUtil release];
  
  [super dealloc];
}


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


- addObject: (id) anObject withRefId: (NSString *) aRefId
  usingDictionary: (NSMutableDictionary *) aDictionary {
  NSMutableDictionary *references;
  
  references = (NSMutableDictionary *) 
    [aDictionary objectForKey: @"__ECXMLControlReferenceRule"];
    
  if( nil == references ) {
    references = [[NSMutableDictionary alloc] init];
    [aDictionary setObject: references forKey: @"__ECXMLControlReferenceRule"];
  }
  
  if( nil != [references objectForKey: aRefId] ) {
    [[[ECIllegalStateException alloc]
      initWithIllegalStateInfo: 
        [NSString stringWithFormat: @"ECXMLControlReferenceRule::addObject: "\
          "Identifier id=%@ has already been defined!", aRefId]]
      raise];
  }
  
  [references setObject: anObject forKey: aRefId];
  
  return self;
}
  
  
- (BOOL) actOn: (ECXMLControlContext *) aContext {
  id userObject;
  NSString *attributeName;
  NSArray *splits;
  BOOL ignoreSubsequentCalls = NO;
  
  userObject = [[aContext state] userObjectAtTopPosition];
  
  if( nil == userObject ) {
    return NO;
  }
  
  EC_AUTORELEASEPOOL_BEGIN
  /**
   * check wether the current attribute equals "id" or ends with
   * "-idref"
   */
  attributeName = [[aContext event] attributeName];
  
  if( NSOrderedSame == [attributeName 
    caseInsensitiveCompare:@"id"] ) {
    [self 
      addObject: userObject 
      withRefId: [[aContext event] attributeValue]
      usingDictionary: [[aContext state] globalRuleData]];
    
    ignoreSubsequentCalls = YES;
  } else {
    splits = [attributeName splitStringUsingDelimiter: @"-"];
    if( 1 < [splits count] ) {
      if( [[splits objectAtIndex: [splits count]-1]
        caseInsensitiveCompare: @"id-ref"] ) {
        NSString *methodName;
        
        if( 7 < [attributeName length] ) {
          methodName = [attributeName 
            substringToIndex: [attributeName length]-6];
        
          if( nil != methodName ) {
            if( 0 < [methodName length] ) {
              [self setReferenceToObject: userObject
                objectIdReference: [[aContext event] attributeValue]
                usingMethod: methodName
                usingDictionary: [[aContext state] globalRuleData]];
            
              ignoreSubsequentCalls=YES;
            }
          }
        }
      }
    }
  }
  
  EC_AUTORELEASEPOOL_END
  
  return ignoreSubsequentCalls;
}


- setReferenceToObject: (id) anObject 
  objectIdReference: (NSString *) idName
  usingMethod: (NSString *) methodName
  usingDictionary: (NSMutableDictionary *) aDictionary {
  id objectToSet;
  NSMutableDictionary *references;
  SEL methodToCall;
  
  references = (NSMutableDictionary *) 
    [aDictionary objectForKey: @"__ECXMLControlReferenceRule"];
  
  if( nil == references ) {
    [[[ECIllegalStateException alloc]
      initWithIllegalStateInfo: 
        [NSString stringWithFormat: @"ECXMLControlReferenceRule::"\
          "setReferenceToObject: Identifier id=%@ unknown!", idName]]
      raise];
  }
  
  objectToSet = [references objectForKey: idName];
  if( nil == objectToSet ) {
    [[[ECIllegalStateException alloc]
      initWithIllegalStateInfo: 
        [NSString stringWithFormat: @"ECXMLControlReferenceRule::"\
          "setReferenceToObject: Identifier id=%@ unknown!", idName]]
      raise];
  }
  
  /* lookup method: */
  methodToCall = [self->setterLookupUtil 
    lookupMethodForAttributeName: methodName
    ofObject: anObject];
    
  if( NULL != methodToCall ) {
    [anObject 
      performSelector: methodToCall
      withObject: objectToSet];
  }
  return self;
}
@end