Last published: January 27, 2016 by 'niallr'
Defines 19 Classes
Extends 33 Classes
NetResources provides a simple API for accessing content via URIs.
NetResources can transform the content of a URI into a relevant object. For example:
'http://www.w3.org' asURI asResource
This package can use the following other packages:
a) GIFSupport - for viewing GIF images
b) WinGDIPlusInterface - for viewing many kinds of images. Windows only. Needs the gdi+.dll
c) LibTidy or Twoflower - for viewing badly formed XML and HTML and using HTML entities
d) PNGImageReader - for viewing PNG images
This package does not provide HTTP behaviour, see NetResourcesHTTP to use the API with HTTP. NetResources works with URIs. It currently supports File URLs, HTTP URLs and Resource URLs. It does not work with FTP URLs at present.
NetResources provides a new kind of URI called a 'resource' URI. It works like so:
Accessing this URI sends myClassMethod to MyClass. For a POST, the same method name is called except with a : (i.e., myClassMethod:) and an argument that contains the parameters of the post.
NetResources has an in-memory and on-disk cache mechanism using CacheItem objects. If the directory './cache' exists then instances of CacheItem are written to disk for later retrieval if the CacheItem is not already in memory. A CacheItem checks its own timestamp to ensure the content is not out of date.
NetResources provides the following API for URIs:
#asResourceInMimeType: aMimeType encoding: anEncoding
#post: contents encoding: anEncoding
#put: contents encoding: anEncoding
Converting the contents of a URL into a Resource object such as an XML DOM tree or an Image object is done using a ResourceHandler. All ResourcesHandlers are subclasses of ResourceHandler. A specific ResourceHandler is picked based on the MimeType of a URI. For File URIs, this is guessed from the filename extension. For HTTP, the HTTP request itself gives the mime type, etc. Each ResourceHandler class must implement the class-side method #canHandle: to say whether that class can handle a given mime type for a URI. On the instance side, a ResourceHandler must implement #handle: contents for: aURI to return the object of interest for a URIs contents.
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Copyright Holders: Software WithStyle, James Robertson