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/* -*-objc-*-
   GSMarkupConnector.h

   Copyright (C) 2002, 2003 Free Software Foundation, Inc.

   Author: Nicola Pero <n.pero@mi.flashnet.it>
   Date: March 2002, July 2003

   This file is part of GNUstep Renaissance

   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; see the file COPYING.LIB.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/ 

#ifndef _GNUstep_H_GSMarkupConnector
#define _GNUstep_H_GSMarkupConnector

#ifndef GNUSTEP
# include <Foundation/Foundation.h>
#else
# include <Foundation/NSObject.h>
#endif

#include "GSMarkupCoding.h"

@class NSString;

/* The root class of our GSMarkup connector objects.  It is really an
 * abstract class.  Our connector objects store reference to objects
 * using their id names.  Connectors can establish the connection once
 * you give them a nameTable dictionary which the connector can use to
 * map id names into the actual source and target objects to connect,
 * and then connect them.  Connectors can be encoded/decode as XML,
 * they implement GSMarkupCoding.  Please note that normally they get
 * a special treatment anyway, and are encoded/decoded either in the
 * special <connectors> section, or implicitly when they are
 * created/saved as links from one object to another inside the
 * attributes of objects.
 */
@interface GSMarkupConnector : NSObject <GSMarkupCoding>
{}
/* This is called to create the object when it is decoded from an XML
 * file.  */
- (id) initWithAttributes: (NSDictionary *)attributes
		  content: (NSArray *)content;

/* These are used when encoding the object into an XML file.  */
- (NSDictionary *) attributes;
- (NSArray *) content;
+ (NSString *) tagName;

/* This is called to establish the connection.  */
- (void) establishConnectionUsingNameTable: (NSDictionary *)nameTable;

/* A useful function which is used by subclasses to lookup id names in
 * the name table.  Supports full xxx.yyy key value syntax: it looks
 * up idString in the name table if idString does not contain a '.'.
 * If idString contains a '.', everything before the first '.' is
 * considered an id to look up in the name table; everything after the
 * '.' is considered a key-value path to apply to the object.  For
 * example, NSApp.mainMenu means: retrieve the object with id 'NSApp'
 * and return [theObject valueForKeyPath: @"mainMenu"]; it would
 * return the NSApplication mainMenu.
 */
+ (id) getObjectForIdString: (NSString *)idString
	     usingNameTable: (NSDictionary *)nameTable;
@end

/*
 * The superclass of our standard connectors, the ones which connect a
 * single _source to a _target using a specified _label.  _source and
 * _target are the objects to connect (actually, their id names), and
 * _label is a string specifying how to perform the connection (_label
 * has a different meaning in different subclasses).
 */
@interface GSMarkupOneToOneConnector : GSMarkupConnector
{
  NSString *_source;
  NSString *_target;
  NSString *_label;
}
- (id) initWithSource: (NSString *)source
	       target: (NSString *)target
		label: (NSString *)label;

- (void) setSource: (NSString *)source;
- (NSString *) source;

- (void) setTarget: (NSString *)source;
- (NSString *) target;

- (void) setLabel: (NSString *)source;
- (NSString *) label;
@end

@interface GSMarkupControlConnector : GSMarkupOneToOneConnector
@end

@interface GSMarkupOutletConnector : GSMarkupOneToOneConnector
@end

#endif /* _GNUstep_H_GSMarkupConnector */