libs-gui/Source/GSGormLoader.m

/** <title>GSGormLoader</title>

   <abstract>Gorm model loader</abstract>

   Copyright (C) 1997, 1999 Free Software Foundation, Inc.

   Author:  Gregory John Casamento <greg_casamento@yahoo.com>
   Date: 2005
   
   This file is part of the GNUstep GUI Library.

   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 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; see the file COPYING.LIB.
   If not, see <http://www.gnu.org/licenses/> or write to the 
   Free Software Foundation, 51 Franklin Street, Fifth Floor, 
   Boston, MA 02110-1301, USA.
*/

#import "config.h"
#import <Foundation/NSArchiver.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSBundle.h>
#import <Foundation/NSData.h>
#import <Foundation/NSDebug.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSFileManager.h>
#import <Foundation/NSString.h>

#import "AppKit/NSApplication.h"
#import "AppKit/NSImage.h"
#import "GNUstepGUI/GSModelLoaderFactory.h"
#import "GNUstepGUI/GSGormLoading.h"

@interface GSGormLoader : GSModelLoader
@end

@implementation GSGormLoader
+ (void) initialize
{
  /* We load the app icon here, at launch time, since GSGormLoader is
     initialized before call -finishLaunching in NSApp (In non document-based
     apps that load a gorm file at launch). So the windows and panels at initial
     gorm file don't show the app icon. Maybe this is a duplicate code,
     but solve the problem (bug #31039). */
  if (![NSApp isRunning])
    {
      NSDictionary	*infoDict = [[NSBundle mainBundle] infoDictionary];
      NSString		*appIconFile;
      NSImage		*image = nil;
      
      appIconFile = [infoDict objectForKey: @"NSIcon"];
      if (appIconFile && ![appIconFile isEqual: @""])
	{
	  image = [NSImage imageNamed: appIconFile];
	}
      
      // Try to look up the icns file.
      appIconFile = [infoDict objectForKey: @"CFBundleIconFile"];
      if (appIconFile && ![appIconFile isEqual: @""])
	{
	  image = [NSImage imageNamed: appIconFile];
	}
      
      if (image == nil)
	{
	  image = [NSImage imageNamed: @"GNUstep"];
	}
      
      [NSApp setApplicationIconImage: image];
    }
}

+ (BOOL) canReadData: (NSData *)theData
{
  char *header = calloc(16, sizeof(char));

  if (header != NULL)
    {
      [theData getBytes: header
                 length: 16];

      if (strncmp("GNUstep archive",header,15) == 0)
        {
          return YES;
        }

      free(header);
    }

  return NO;
}

+ (NSString *)type
{
  return @"gorm";
}

+ (float) priority
{
  return 1.0;
}


- (BOOL) loadModelData: (NSData *)data
     externalNameTable: (NSDictionary *)context
              withZone: (NSZone *)zone
{
  BOOL		loaded = NO;
  NSUnarchiver *unarchiver = nil;

  NS_DURING
    {
      if (data != nil)
	{
	  unarchiver = [[NSUnarchiver alloc] 
			 initForReadingWithData: data];
	  if (unarchiver != nil)
	    {
	      id obj;
	      
	      NSDebugLog(@"Invoking unarchiver");
	      [unarchiver setObjectZone: zone];
	      obj = [unarchiver decodeObject];
	      if (obj != nil)
		{
		  if ([obj isKindOfClass: [GSNibContainer class]])
		    {
		      NSDebugLog(@"Calling awakeWithContext");
		      [obj awakeWithContext: context];
		      loaded = YES;
		    }
		  else
		    {
		      NSLog(@"Gorm does not have a container object!");
		    }
		}
	      RELEASE(unarchiver);
	    }
	}
    }
  NS_HANDLER
    {
      NSLog(@"Exception occurred while loading model: %@",[localException reason]);
      TEST_RELEASE(unarchiver);
    }
  NS_ENDHANDLER

  if (loaded == NO)
    {
      NSLog(@"Failed to load Gorm\n");
    }

  return loaded;
}

- (NSData *) dataForFile: (NSString *)fileName
{
  NSFileManager	*mgr = [NSFileManager defaultManager];
  BOOL isDir = NO;

  NSDebugLog(@"Loading Gorm `%@'...\n", fileName);
  if ([mgr fileExistsAtPath: fileName isDirectory: &isDir])
    {
      NSData *data = nil;
      
      // if the data is in a directory, then load from objects.gorm in the directory
      if (isDir == NO)
	{
	  data = [NSData dataWithContentsOfFile: fileName];
	  NSDebugLog(@"Loaded data from file...");
	}
      else
	{
	  NSString *newFileName = [fileName stringByAppendingPathComponent: @"objects.gorm"];
	  data = [NSData dataWithContentsOfFile: newFileName];
	  NSDebugLog(@"Loaded data from %@...",newFileName);
	}
      return data;
    }
  else
    {
      NSLog(@"Gorm file specified %@, could not be found.", fileName);
    }
  return nil;
}

@end