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XMPPAttentionModule.m
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XMPPAttentionModule.m
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#import "XMPPAttentionModule.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 XMPPAttentionModule
- (id)init
{
return [self initWithDispatchQueue:NULL];
}
- (id)initWithDispatchQueue:(dispatch_queue_t)queue
{
if ((self = [super initWithDispatchQueue:queue]))
{
respondsToQueries = YES;
}
return self;
}
- (BOOL)activate:(XMPPStream *)aXmppStream
{
if ([super activate:aXmppStream])
{
#ifdef _XMPP_CAPABILITIES_H
[xmppStream autoAddDelegate:self delegateQueue:moduleQueue toModulesOfClass:[XMPPCapabilities class]];
#endif
return YES;
}
return NO;
}
- (void)deactivate
{
#ifdef _XMPP_CAPABILITIES_H
[xmppStream removeAutoDelegate:self delegateQueue:moduleQueue fromModulesOfClass:[XMPPCapabilities class]];
#endif
[super deactivate];
}
- (BOOL)respondsToQueries
{
if (dispatch_get_current_queue() == moduleQueue)
{
return respondsToQueries;
}
else
{
__block BOOL result;
dispatch_sync(moduleQueue, ^{
result = respondsToQueries;
});
return result;
}
}
- (void)setRespondsToQueries:(BOOL)flag
{
dispatch_block_t block = ^{
if (respondsToQueries != flag)
{
respondsToQueries = flag;
#ifdef _XMPP_CAPABILITIES_H
@autoreleasepool {
// Capabilities may have changed, need to notify others.
[xmppStream resendMyPresence];
}
#endif
}
};
if (dispatch_get_current_queue() == moduleQueue)
block();
else
dispatch_async(moduleQueue, block);
}
- (BOOL)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
{
// This method is invoked on the moduleQueue.
// Format of an attention message. Body is optional and not used by clients like Pidgin
// <message from='calvin@usrobots.lit/lab' to='herbie@usrobots.lit/home' type='headline'>
// <attention xmlns='urn:xmpp:attention:0'/>
// <body>Why don't you answer, Herbie?</body>
// </message>
if ([message isAttentionMessage])
{
[multicastDelegate xmppAttention:self didReceiveAttentionHeadlineMessage:message];
}
return YES;
}
#ifdef _XMPP_CAPABILITIES_H
/**
* If an XMPPCapabilites instance is used we want to advertise our support for attention requests.
**/
- (void)xmppCapabilities:(XMPPCapabilities *)sender collectingMyCapabilities:(NSXMLElement *)query
{
// This method is invoked on the moduleQueue.
if (respondsToQueries)
{
// <query xmlns="http://jabber.org/protocol/disco#info">
// ...
// <feature var="urn:xmpp:attention:0"/>
// ...
// </query>
NSXMLElement *feature = [NSXMLElement elementWithName:@"feature"];
[feature addAttributeWithName:@"var" stringValue:XMLNS_ATTENTION];
[query addChild:feature];
}
}
#endif
@end