Added ULIMultiMap, a dictionary that can store several objects for on…

…e key. Actually just a wrapper around a dictionary of arrays.

ULIMultiMap.h

@@ -0,0 +1,26 @@
+//
+//  ULIMultiMap.h
+//  Propaganda
+//
+//  Created by Uli Kusterer on 21.03.10.
+//  Copyright 2010 The Void Software. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+
+@interface ULIMultiMap : NSObject
+{
+	NSMutableDictionary*	mDictionary;
+}
+
+-(void)		addObject: (id)theObj forKey: (id)theKey;	// Adds it to the list of objects.
+-(void)		setObject: (id)theObj forKey: (id)theKey;	// Removes all other objects.
+
+-(void)		removeObject: (id)theObj forKey: (id)theKey;
+-(void)		removeObjectsForKey: (id)theKey;
+-(void)		removeObject: (id)theObj;
+
+-(NSArray*)	objectsForKey: (id)theKey;
+
+@end

ULIMultiMap.m

@@ -0,0 +1,70 @@
+//
+//  ULIMultiMap.m
+//  Propaganda
+//
+//  Created by Uli Kusterer on 21.03.10.
+//  Copyright 2010 The Void Software. All rights reserved.
+//
+
+#import "ULIMultiMap.h"
+
+
+@implementation ULIMultiMap
+
+-(void)		addObject: (id)theObj forKey: (id)theKey
+{
+	if( !mDictionary )
+		mDictionary = [[NSMutableDictionary alloc] init];
+
+	NSMutableArray*	arr = [mDictionary objectForKey: theKey];
+	if( !arr )
+	{
+		arr = [NSMutableArray arrayWithObject: theObj];
+		[mDictionary setObject: arr forKey: theKey];
+	}
+	else
+		[arr addObject: theObj];
+}
+
+
+-(void)		setObject: (id)theObj forKey: (id)theKey
+{
+	if( !mDictionary )
+		mDictionary = [[NSMutableDictionary alloc] init];
+
+	[mDictionary setObject: [NSMutableArray arrayWithObject: theObj]
+					forKey: theKey];
+}
+
+
+-(void)		removeObject: (id)theObj forKey: (id)theKey
+{
+	if( !mDictionary )
+		return;
+
+	NSMutableArray*	arr = [mDictionary objectForKey: theKey];
+	if( !arr )
+		return;
+
+	[arr removeObject: theObj];
+}
+
+
+-(void)		removeObjectsForKey: (id)theKey;
+{
+	[mDictionary removeObjectForKey: theKey];
+}
+
+
+-(void)		removeObject: (id)theObj
+{
+	for( NSMutableArray* arr in [mDictionary allValues] )
+		[arr removeObject: theObj];
+}
+
+-(NSArray*)	objectsForKey: (id)theKey
+{
+	return [mDictionary objectForKey: theKey];
+}
+
+@end