- Update

Core/XMPPPresence.m

@@ -0,0 +1,145 @@
+#import "XMPPPresence.h"
+#import "XMPPJID.h"
+#import "NSXMLElement+XMPP.h"
+
+#import <objc/runtime.h>
+
+#if ! __has_feature(objc_arc)
+#warning This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
+#endif
+
+
+@implementation XMPPPresence
+
+#if DEBUG
+
++ (void)initialize
+{
+	// We use the object_setClass method below to dynamically change the class from a standard NSXMLElement.
+	// The size of the two classes is expected to be the same.
+	// 
+	// If a developer adds instance methods to this class, bad things happen at runtime that are very hard to debug.
+	// This check is here to aid future developers who may make this mistake.
+	// 
+	// For Fearless And Experienced Objective-C Developers:
+	// It may be possible to support adding instance variables to this class if you seriously need it.
+	// To do so, try realloc'ing self after altering the class, and then initialize your variables.
+	
+	size_t superSize = class_getInstanceSize([NSXMLElement class]);
+	size_t ourSize   = class_getInstanceSize([XMPPPresence class]);
+	
+	if (superSize != ourSize)
+	{
+		NSLog(@"Adding instance variables to XMPPPresence is not currently supported!");
+		exit(15);
+	}
+}
+
+#endif
+
++ (XMPPPresence *)presenceFromElement:(NSXMLElement *)element
+{
+	object_setClass(element, [XMPPPresence class]);
+	
+	return (XMPPPresence *)element;
+}
+
++ (XMPPPresence *)presence
+{
+	return [[XMPPPresence alloc] init];
+}
+
++ (XMPPPresence *)presenceWithType:(NSString *)type
+{
+	return [[XMPPPresence alloc] initWithType:type to:nil];
+}
+
++ (XMPPPresence *)presenceWithType:(NSString *)type to:(XMPPJID *)to
+{
+	return [[XMPPPresence alloc] initWithType:type to:to];
+}
+
+- (id)init
+{
+	self = [super initWithName:@"presence"];
+	return self;
+}
+
+- (id)initWithType:(NSString *)type
+{
+	return [self initWithType:type to:nil];
+}
+
+- (id)initWithType:(NSString *)type to:(XMPPJID *)to
+{
+	if ((self = [super initWithName:@"presence"]))
+	{
+		if (type)
+			[self addAttributeWithName:@"type" stringValue:type];
+		
+		if (to)
+			[self addAttributeWithName:@"to" stringValue:[to full]];
+	}
+	return self;
+}
+
+- (id)initWithXMLString:(NSString *)string error:(NSError *__autoreleasing *)error
+{
+	if((self = [super initWithXMLString:string error:error])){
+		self = [XMPPPresence presenceFromElement:self];
+	}	
+	return self;
+}
+
+- (id)copyWithZone:(NSZone *)zone
+{
+    NSXMLElement *element = [super copyWithZone:zone];
+    return [XMPPPresence presenceFromElement:element];
+}
+
+- (NSString *)type
+{
+	NSString *type = [self attributeStringValueForName:@"type"];
+	if(type)
+		return [type lowercaseString];
+	else
+		return @"available";
+}
+
+- (NSString *)show
+{
+	return [[self elementForName:@"show"] stringValue];
+}
+
+- (NSString *)status
+{
+	return [[self elementForName:@"status"] stringValue];
+}
+
+- (int)priority
+{
+	return [[[self elementForName:@"priority"] stringValue] intValue];
+}
+
+- (int)intShow
+{
+	NSString *show = [self show];
+	
+	if([show isEqualToString:@"dnd"])
+		return 0;
+	if([show isEqualToString:@"xa"])
+		return 1;
+	if([show isEqualToString:@"away"])
+		return 2;
+	if([show isEqualToString:@"chat"])
+		return 4;
+	
+	return 3;
+}
+
+- (BOOL)isErrorPresence
+{
+	return [[self type] isEqualToString:@"error"];
+}
+
+@end