Overview

SBJsonStreamParserDelegate protocol adapter

Rather than implementing the SBJsonStreamParserDelegate protocol yourself you will most likely find it much more convenient to use an instance of this class and implement the SBJsonStreamParserAdapterDelegate protocol instead.

The default behaviour is that the delegate only receives one call from either the -parser:foundArray: or -parser:foundObject: method when the document is fully parsed. However, if your inputs contains multiple JSON documents and you set the parser’s -supportMultipleDocuments property to YES you will get one call for each full method.

 SBJsonStreamParserAdapter *adapter = [[[SBJsonStreamParserAdapter alloc] init] autorelease];
 adapter.delegate = self;

 SBJsonStreamParser *parser = [[[SBJsonStreamParser alloc] init] autorelease];
 parser.delegate = adapter;
 parser.supportMultipleDocuments = YES;

 // Note that this input contains multiple top-level JSON documents
 NSData *json = [@"[]{}[]{}" dataWithEncoding:NSUTF8StringEncoding];
 [parser parse:data];

In the above example self will have the following sequence of methods called on it:

• -parser:foundArray:
• -parser:foundObject:
• -parser:foundArray:
• -parser:foundObject:

Often you won’t have control over the input you’re parsing, so can’t make use of this feature. But, all is not lost: this class will let you get the same effect by allowing you to skip one or more of the outer enclosing objects. Thus, the next example results in the same sequence of -parser:foundArray: / -parser:foundObject: being called on your delegate.

 SBJsonStreamParserAdapter *adapter = [[[SBJsonStreamParserAdapter alloc] init] autorelease];
 adapter.delegate = self;
 adapter.levelsToSkip = 1;

 SBJsonStreamParser *parser = [[[SBJsonStreamParser alloc] init] autorelease];
 parser.delegate = adapter;

 // Note that this input contains A SINGLE top-level document
 NSData *json = [@"[[],{},[],{}]" dataWithEncoding:NSUTF8StringEncoding];
 [parser parse:data];