/** GSWSwitchComponent.m - <title>GSWeb: Class GSWSwitchComponent</title>

   Copyright (C) 1999-2004 Free Software Foundation, Inc.
   
   Written by:	Manuel Guesdon <mguesdon@orange-concept.com>
   Date: 	Jan 1999
   
   $Revision$
   $Date$
   
   <abstract></abstract>

   This file is part of the GNUstep Web Library.
   
   <license>
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 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
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   </license>
**/

#include "config.h"

#include "GSWeb.h"

//====================================================================
@implementation GSWSwitchComponent

//--------------------------------------------------------------------
-(id)initWithName:(NSString*)aName
     associations:(NSDictionary*)associations
         template:(GSWElement*)template
{
  if ((self=[super initWithName:nil
                   associations:nil
                   template:nil]))
    {
      NSMutableDictionary* tmpAssociations=[NSMutableDictionary dictionaryWithDictionary:associations];
      
      ASSIGN(_componentName,([associations objectForKey:GSWComponentName__Key[GSWebNamingConv]]));
      if (_componentName)
	[tmpAssociations removeObjectForKey:GSWComponentName__Key[GSWebNamingConv]];
      else
	{
	  ASSIGN(_componentName,([associations objectForKey:componentName__Key]));
	  if (_componentName)
	    [tmpAssociations removeObjectForKey:componentName__Key];
	  else
	    {
	      [NSException raise:NSInvalidArgumentException
			   format:@"%s: Missing required attribute: '%@'",
			   __PRETTY_FUNCTION__,GSWComponentName__Key[GSWebNamingConv]];
	    }
	}

      ASSIGN(_componentAttributes,tmpAssociations);
      ASSIGN(_template,template);
      
      _componentCache=[NSMutableDictionary new];
    };
  return self;
};

//--------------------------------------------------------------------
-(void)dealloc
{
  DESTROY(_componentName);
  DESTROY(_componentAttributes);
  DESTROY(_template);
  DESTROY(_componentCache);
  [super dealloc];
};

//--------------------------------------------------------------------
-(NSString*)description
{
  return [NSString stringWithFormat:@"<%s %p>",
				   object_getClassName(self),
				   (void*)self];
};

//-------------------------------------------------------------------- 
/** returns the element name by resolving _componentName association **/
-(NSString*)_elementNameInContext:(GSWContext*)aContext
{
  GSWComponent* component=GSWContext_component(aContext);
  NSString* componentName=NSStringWithObject([_componentName valueInComponent:component]);
  if ([componentName length]==0)
    {
      [NSException raise:NSInternalInconsistencyException
		   format:@"%s: componentName not specified or evaluate to nil or empty",
		   __PRETTY_FUNCTION__];
    }
  return componentName;
};

//-------------------------------------------------------------------- 
/** returns a GSWComponentReference representing component named aName 
if the component has already been created, it get it from the cache; otherwise, it is created.
**/
-(GSWElement*)_realComponentWithName:(NSString*)aName
                           inContext:(GSWContext*)aContext
{
  GSWElement* element=nil;

  if ([aName length]==0)
    {      
      [NSException raise:NSInternalInconsistencyException
		   format:@"%s: no componentName",
		   __PRETTY_FUNCTION__];
    }
  else
    {
      element=[_componentCache objectForKey:aName];
      if (element==nil)
        {
          NSArray* languages=[aContext languages];
          element=[GSWApp dynamicElementWithName:aName
                          associations:_componentAttributes
                          template:_template
                          languages:languages];
          if (element)
            {
              [_componentCache setObject:element
                               forKey:aName];
            }
          else
            {
	      [NSException raise:NSInternalInconsistencyException
			   format:@"%s: cannot find component or dynamic element named %@",
			   __PRETTY_FUNCTION__,aName];
            };
        };
    };

  return element;
};

//--------------------------------------------------------------------
-(void)takeValuesFromRequest:(GSWRequest*)aRequest
                   inContext:(GSWContext*)aContext
{
  GSWElement* element=nil;
  NSString* elementNameInContext=nil;

  GSWStartElement(aContext);
  GSWAssertCorrectElementID(aContext);

  elementNameInContext=[self _elementNameInContext:aContext];

  GSWContext_appendElementIDComponent(aContext,elementNameInContext);

  if ([elementNameInContext length]==0)
    {
      ExceptionRaise(@"GSWSwitchComponent",@"ComponentName Value is null ! componentName: %@",
                     _componentName);
    };
  element=[self _realComponentWithName:elementNameInContext
                inContext:aContext];
  [element takeValuesFromRequest:aRequest
           inContext:aContext];

  GSWContext_deleteLastElementIDComponent(aContext);
};

//--------------------------------------------------------------------
-(GSWElement*)invokeActionForRequest:(GSWRequest*)request
                           inContext:(GSWContext*)aContext
{
  id <GSWActionResults, NSObject> resultElement=nil;
  GSWElement* element=nil;
  NSString* elementNameInContext=nil;
  
  GSWStartElement(aContext);
  GSWAssertCorrectElementID(aContext);

  elementNameInContext=[self _elementNameInContext:aContext];

  GSWContext_appendElementIDComponent(aContext,elementNameInContext);

  if ([elementNameInContext length]==0)
    {
        ExceptionRaise(@"GSWSwitchComponent",@"ComponentName Value is null ! componentName: %@",
                       _componentName);
    };

  element=[self _realComponentWithName:elementNameInContext
		inContext:aContext];
  resultElement = (id <GSWActionResults, NSObject>) [element invokeActionForRequest:request
							     inContext:aContext];
  GSWContext_deleteLastElementIDComponent(aContext);
    
  return resultElement;
}

//--------------------------------------------------------------------
-(void)appendToResponse:(GSWResponse*)response
              inContext:(GSWContext*)aContext
{
  GSWElement* element=nil;
  NSString* elementNameInContext=nil;

  GSWStartElement(aContext);
  GSWSaveAppendToResponseElementID(aContext);

  elementNameInContext=[self _elementNameInContext:aContext];

  GSWContext_appendElementIDComponent(aContext,elementNameInContext);

  if ([elementNameInContext length]==0)
    {
      ExceptionRaise(@"GSWSwitchComponent",@"ComponentName Value is null ! componentName: %@",
                     _componentName);
    };
  element=[self _realComponentWithName:elementNameInContext
                inContext:aContext];
  [element appendToResponse:response
           inContext:aContext];

  GSWContext_deleteLastElementIDComponent(aContext);
};

@end