From 0d3c3d1b2a5960b157fa85bdbca89a6721d8d0da Mon Sep 17 00:00:00 2001
From: Gregory John Casamento <greg.casamento@gmail.com>
Date: Sat, 24 Apr 2021 06:06:45 -0400
Subject: [PATCH] Add interface and abstract implementation of
 modelLoaderForData:

---
 .../GNUstepGUI/GSModelLoaderFactory.h         |  6 +++--
 Source/GSModelLoaderFactory.m                 | 25 +++++++++++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/Headers/Additions/GNUstepGUI/GSModelLoaderFactory.h b/Headers/Additions/GNUstepGUI/GSModelLoaderFactory.h
index 157720402..af6470623 100644
--- a/Headers/Additions/GNUstepGUI/GSModelLoaderFactory.h
+++ b/Headers/Additions/GNUstepGUI/GSModelLoaderFactory.h
@@ -1,6 +1,6 @@
-/** <title>NSBundleAdditions</title>
+/** <title>GSModelLoaderFactory</title>
 
-   <abstract>Implementation of NSBundle Additions</abstract>
+   <abstract>Interface of GSModelLoader and GSModelLoaderFactory</abstract>
 
    Copyright (C) 2005 Free Software Foundation, Inc.
 
@@ -39,6 +39,7 @@
 @class NSBundle;
 
 @interface GSModelLoader : NSObject
++ (BOOL) canReadData: (NSData *)theData;
 + (NSString *) type;
 + (float) priority;
 - (BOOL) loadModelData: (NSData *)data
@@ -57,6 +58,7 @@
 + (NSString *) supportedModelFileAtPath: (NSString *)modelPath;
 + (GSModelLoader *) modelLoaderForFileType: (NSString *)type;
 + (GSModelLoader *) modelLoaderForFileName: (NSString *)modelPath;
++ (GSModelLoader *) modelLoaderForData: (NSData *)theData;
 @end
 
 #endif
diff --git a/Source/GSModelLoaderFactory.m b/Source/GSModelLoaderFactory.m
index 1dc674f2f..4d2857f5b 100644
--- a/Source/GSModelLoaderFactory.m
+++ b/Source/GSModelLoaderFactory.m
@@ -38,6 +38,11 @@
 #import "GNUstepGUI/GSModelLoaderFactory.h"
 
 @implementation GSModelLoader
++ (BOOL) canReadData: (NSData *)theData
+{
+  return NO;
+}
+
 + (NSString *) type
 {
   return nil;
@@ -103,6 +108,7 @@
 static NSMutableDictionary *_modelMap = nil;
 
 @implementation GSModelLoaderFactory
+
 + (void) initialize
 {
   NSArray *classes = GSObjCAllSubclassesOfClass([GSModelLoader class]);
@@ -216,4 +222,23 @@ static NSMutableDictionary *_modelMap = nil;
   
   return result;  
 }
+
++ (GSModelLoader *) modelLoaderForData: (NSData *)theData
+{
+  NSEnumerator *oen = [_modelMap objectEnumerator];
+  Class aClass = nil;
+  GSModelLoader *result = nil;
+  
+  while ((aClass = [oen nextObject]) != nil)
+    {
+      if ([aClass canReadData: theData])
+        {
+          result = AUTORELEASE([[aClass alloc] init]);
+          break;
+        }
+    }
+
+  return result;
+}
+
 @end