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<html><head>
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<title>NSURLHandle</title>
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</head>
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<body>
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<a href ="NSURL.html">[Previous]</a>
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<a href ="Base.html">[Up]</a>
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<a href ="NSUnarchiver.html">[Next]</a>
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2000-03-05 17:39:33 +00:00
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<h1>NSURLHandle</h1>
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<h3>Authors </h3>
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<dl>
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<dt><a href ="http://www.gnustep.org/developers/whoiswho.html">Richard Frith-Macdonald</a>
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<dd>
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</dl>
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<p>Version: 0.1</p>
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<p>Date: 28 February, 2000</p>
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<h2><a name ="cont-0">NSURLHandle</a></h2>
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<h2><a name ="NSURLHandle">NSURLHandle</a></h2>
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<p><b>Declared in: </b> Foundation/NSURLHandle.h</p>
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<p><b>Inherits from: </b> NSObject</p>
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<hr>
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2000-09-25 06:06:28 +00:00
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<p>
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An NSURLHandle instance is used to manage the resource data
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corresponding to an NSURL object. A single NSURLHandle can
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be used to manage multiple NSURL objects as long as those
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objects all refer to the same resource.
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</p>
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<p>
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Different NSURLHandle subclasses are used to manage different
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types of URL (usually based on the scheme of the URL), and you
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can register new subclasses to extend (or replace) the
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standard ones.
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</p>
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<h2>Instance Variables </h2>
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<ul>
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</ul>
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<h2>Methods </h2>
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<ul>
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<li><a href ="NSURLHandle.html#method-0">+URLHandleClassForURL:</a>
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<li><a href ="NSURLHandle.html#method-1">+cachedHandleForURL:</a>
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<li><a href ="NSURLHandle.html#canInitWithURL:">+canInitWithURL:</a>
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<li><a href ="NSURLHandle.html#method-2">+registerURLHandleClass:</a>
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<li><a href ="NSURLHandle.html#method-3">-addClient:</a>
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<li><a href ="NSURLHandle.html#method-4">-availableResourceData</a>
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<li><a href ="NSURLHandle.html#method-5">-backgroundLoadDidFailWithReason:</a>
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<li><a href ="NSURLHandle.html#method-6">-beginLoadInBackground</a>
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<li><a href ="NSURLHandle.html#cancelLoadInBackground">-cancelLoadInBackground</a>
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<li><a href ="NSURLHandle.html#method-7">-didLoadBytes:loadComplete:</a>
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<li><a href ="NSURLHandle.html#endLoadInBackground">-endLoadInBackground</a>
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<li><a href ="NSURLHandle.html#method-8">-failureReason</a>
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<li><a href ="NSURLHandle.html#method-9">-flushCachedData</a>
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<li><a href ="NSURLHandle.html#method-10">-initWithURL:cached:</a>
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<li><a href ="NSURLHandle.html#method-11">-loadInBackground</a>
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<li><a href ="NSURLHandle.html#loadInForeground">-loadInForeground</a>
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<li><a href ="NSURLHandle.html#method-12">-propertyForKey:</a>
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<li><a href ="NSURLHandle.html#method-13">-propertyForKeyIfAvailable:</a>
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<li><a href ="NSURLHandle.html#method-14">-removeClient:</a>
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<li><a href ="NSURLHandle.html#method-15">-resourceData</a>
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<li><a href ="NSURLHandle.html#method-16">-status</a>
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<li><a href ="NSURLHandle.html#method-17">-writeData:</a>
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<li><a href ="NSURLHandle.html#method-18">-writeProperty:</a>
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</ul>
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<hr><h2>Class Methods </h2>
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<h3><a name ="method-0">URLHandleClassForURL:</a></h3>
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+ (Class) <b>URLHandleClassForURL:</b> (NSURL*)anURL;<br>
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Returns the most recently registered NSURLHandle subclass that
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responds to <a href ="#canInitWithURL:">canInitWithURL:</a>
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with <code>YES</code>. If there is no such subclass, returns nil.
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<hr>
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<h3><a name ="method-1">cachedHandleForURL:</a></h3>
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+ (NSURLHandle*) <b>cachedHandleForURL:</b> (NSURL*)anURL;<br>
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Returns a previously created object that handles the specified
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URL (if any exists), otherwise returns nil.
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<hr>
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<h3><a name ="canInitWithURL:">canInitWithURL:</a></h3>
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+ (BOOL) <b>canInitWithURL:</b> (NSURL*)anURL;<br>
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Your subclass <em>must </em> override this abstract method.<br>
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Implemented by subclasses to say which URLs they can handle.
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This method is used to determine which subclasses can be used
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to handle a particular URL.
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<hr>
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<h3><a name ="method-2">registerURLHandleClass:</a></h3>
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+ (void) <b>registerURLHandleClass:</b> (Class)anURLHandleSubclass;<br>
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Used to register a subclass as being available to handle URLs.
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<hr>
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<hr><h2>Instances Methods </h2>
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<h3><a name ="method-3">addClient:</a></h3>
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- (void) <b>addClient:</b> (id<NSURLHandleClient>)client;<br>
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Adds an object conforming to the
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<a href ="#NSURLHandleClient">NSURLHandleClient protocol</a>
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as a client of the URL handle.
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<hr>
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<h3><a name ="method-4">availableResourceData</a></h3>
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- (NSData*) <b>availableResourceData</b>;<br>
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Returns the resource data that is currently available for the
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handle. This may be a partially loaded resource or may be
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empty of no data has been loaded yet.
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<hr>
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<h3><a name ="method-5">backgroundLoadDidFailWithReason:</a></h3>
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- (void) <b>backgroundLoadDidFailWithReason:</b> (NSString*)reason;<br>
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This method should be called when a background load fails.
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The method passes the failure notification to the clients of
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the handle - so subclasses should call super's implementation
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at the end of their implementation of this method.
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<hr>
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<h3><a name ="method-6">beginLoadInBackground</a></h3>
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- (void) <b>beginLoadInBackground</b>;<br>
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This method is called by when a background load begins.
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Subclasses should call super's implementation at
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the end of their implementation of this method.
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<hr>
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<h3><a name ="cancelLoadInBackground">cancelLoadInBackground</a></h3>
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- (void) <b>cancelLoadInBackground</b>;<br>
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This method should be called to cancel a load currently in
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progress. The method calls
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<a href ="#endLoadInBackground">endLoadInBackground</a>
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Subclasses should call super's implementation at
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the end of their implementation of this method.
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<hr>
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<h3><a name ="method-7">didLoadBytes:loadComplete:</a></h3>
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- (void) <b>didLoadBytes:</b> (NSData*)newBytes <b>loadComplete:</b> (BOOL)yorn;<br>
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This method must be called by subclasses whenever data is
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loaded.
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<hr>
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<h3><a name ="endLoadInBackground">endLoadInBackground</a></h3>
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- (void) <b>endLoadInBackground</b>;<br>
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This method is called to stop any background loading process.
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<a href ="NSURLHandle.html#cancelLoadInBackground">cancelLoadInBackground</a>
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uses this method to cancel loading.
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Subclasses should call super's implementation at
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the end of their implementation of this method.
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<hr>
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<h3><a name ="method-8">failureReason</a></h3>
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- (NSString*) <b>failureReason</b>;<br>
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Returns the failure reason for the last failure to load
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the resource data.
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<hr>
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<h3><a name ="method-9">flushCachedData</a></h3>
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- (void) <b>flushCachedData</b>;<br>
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Flushes any cached resource data.
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<hr>
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<h3><a name ="method-10">initWithURL:cached:</a></h3>
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<b>This is the designated initialiser </b><br>
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- (init) <b>initWithURL:</b> (NSURL*)url <b>cached:</b> (BOOL)yesno;<br>
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Your subclass <em>must </em> override this abstract method.<br>
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Initialises a handle with the specified URL.
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The flag determines whether the handle will cache resource data
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and respond to requests from equivalent URLs for the cached data.
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<hr>
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<h3><a name ="method-11">loadInBackground</a></h3>
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- (void) <b>loadInBackground</b>;<br>
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Your subclass <em>must </em> override this abstract method.<br>
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Starts (or queues) loading of the handle's resource data
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in the background (asynchronously).
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<hr>
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<h3><a name ="loadInForeground">loadInForeground</a></h3>
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- (NSData*) <b>loadInForeground</b>;<br>
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Loads the handle's resource data in the foreground (synchronously).
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This may be implemented by starting a background load and
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waiting for it to complete.
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<hr>
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<h3><a name ="method-12">propertyForKey:</a></h3>
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- (id) <b>propertyForKey:</b> (NSString*)propertyKey;<br>
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Your subclass <em>must </em> override this abstract method.<br>
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Returns the property for the specified key, or nil if the
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key does not exist.
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<hr>
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<h3><a name ="method-13">propertyForKeyIfAvailable:</a></h3>
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- (id) <b>propertyForKeyIfAvailable:</b> (NSString*)propertyKey;<br>
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Your subclass <em>must </em> override this abstract method.<br>
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Returns the property for the specified key, but only if the
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handle does not need to do any work to retrieve it.
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<hr>
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<h3><a name ="method-14">removeClient:</a></h3>
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- (void) <b>removeClient:</b> (id<NSURLHandleClient>)client;<br>
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Removes an object from them list of clients notified of
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resource loading events by the URL handle.
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<hr>
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<h3><a name ="method-15">resourceData</a></h3>
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- (NSData*) <b>resourceData</b>;<br>
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Returns the resource data belonging to the handler.
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Calls <a href ="NSURLHandle.html#loadInForeground">loadInForeground</a> if
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necessary.
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<hr>
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<h3><a name ="method-16">status</a></h3>
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2000-07-04 19:53:39 +00:00
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- (NSURLHandleStatus) <b>status</b>;<br>
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2000-03-05 17:39:33 +00:00
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2000-09-25 06:06:28 +00:00
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Returns the current status of the handle.
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2000-03-05 17:39:33 +00:00
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2000-09-22 13:45:58 +00:00
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<hr>
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2000-09-25 06:06:28 +00:00
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<h3><a name ="method-17">writeData:</a></h3>
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2000-07-04 19:53:39 +00:00
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- (BOOL) <b>writeData:</b> (NSData*)data;<br>
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2000-09-25 06:06:28 +00:00
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Your subclass <em>must </em> override this abstract method.<br>
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2000-03-05 17:39:33 +00:00
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2000-09-25 06:06:28 +00:00
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Writes resource data to the handle. Returns YES on success,
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NO on failure.
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2000-03-05 17:39:33 +00:00
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2000-09-22 13:45:58 +00:00
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<hr>
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2000-09-25 06:06:28 +00:00
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<h3><a name ="method-18">writeProperty:</a></h3>
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2000-07-04 19:53:39 +00:00
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- (BOOL) <b>writeProperty:</b> (id)propertyValue;<br>
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2000-09-25 06:06:28 +00:00
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Your subclass <em>must </em> override this abstract method.<br>
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Attempts to set property for handle.
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<hr>
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<h2><a name ="NSURLHandleClient">NSURLHandleClient Protocol </a></h2>
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<p><b>Declared in: </b> Foundation/NSURLHandle.h</p>
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<hr>
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<ul>
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<li><a href ="NSURLHandle.html#method-22">-URLHandle:resourceDidBecomeAvailable:</a>
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<li><a href ="NSURLHandle.html#method-23">-URLHandle:resourceDidFailLoadingWithReason:</a>
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<li><a href ="NSURLHandle.html#method-19">-URLHandleResourceDidBeginLoading:</a>
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<li><a href ="NSURLHandle.html#method-20">-URLHandleResourceDidCancelLoading:</a>
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<li><a href ="NSURLHandle.html#method-21">-URLHandleResourceDidFinishLoading:</a>
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</ul>
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<hr>
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<h3><a name ="method-19">URLHandleResourceDidBeginLoading:</a></h3>
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- (void) <b>URLHandleResourceDidBeginLoading:</b> (NSURLHandle*)sender;<br>
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Sent by the NSURLHandle object when it begins loading
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resource data.
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<hr>
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<h3><a name ="method-20">URLHandleResourceDidCancelLoading:</a></h3>
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- (void) <b>URLHandleResourceDidCancelLoading:</b> (NSURLHandle*)sender;<br>
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Sent by the NSURLHandle object when resource loading is cancelled
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by programmatic request (rather than by failure).
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<hr>
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<h3><a name ="method-21">URLHandleResourceDidFinishLoading:</a></h3>
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- (void) <b>URLHandleResourceDidFinishLoading:</b> (NSURLHandle*)sender;<br>
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2000-03-05 17:39:33 +00:00
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2000-09-25 06:06:28 +00:00
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Sent by the NSURLHandle object when it completes loading
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resource data.
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2000-03-05 17:39:33 +00:00
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2000-09-25 06:06:28 +00:00
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<hr>
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<h3><a name ="method-22">URLHandle:resourceDidBecomeAvailable:</a></h3>
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- (void) <b>URLHandle:</b> (NSURLHandle*)sender <b>resourceDidBecomeAvailable:</b> (NSData*)data;<br>
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Sent by the NSURLHandle object when some data becomes available
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from the handle.
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<hr>
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<h3><a name ="method-23">URLHandle:resourceDidFailLoadingWithReason:</a></h3>
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- (void) <b>URLHandle:</b> (NSURLHandle*)sender <b>resourceDidFailLoadingWithReason:</b> (NSString*)reason;<br>
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Sent by the NSURLHandle object on resource load failure.
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Supplies a human readable failure reason.
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<hr>
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<h3><a name ="NSURLHandleStatus">NSURLHandleStatus</a></h3>
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<p><b>Declared in: </b> Foundation/NSURLHandle.h</p>
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<b>typedef </b> int NSURLHandleStatus<br>
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An NSURLHandleStatus is used to report the current state of an
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NSURLHandle object, it can take the following values -
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<ul>
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<li>NSURLHandleNotLoaded
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<li>NSURLHandleLoadSucceeded
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<li>NSURLHandleLoadInProgress
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<li>NSURLHandleLoadFailed
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</ul>
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2000-09-22 13:45:58 +00:00
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<hr>
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2000-03-05 17:39:33 +00:00
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</body>
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2000-09-22 13:45:58 +00:00
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</html>
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