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Programming__WebObjects-Web Applications-Development-Tips and Tricks

Version 5.1 by smmccraw on 2007/07/08 09:46

URL's

  • wocontext.request().uri() = the URL currently being requested

There are several different URL's associated with your application, all of which can be retrieved from various methods on WOApplication. Here is a quick cheat sheet of them:

  • WOApplication.application().baseURL() = /WebObjects
  • WOApplication.application().applicationBaseURL() = /WebObjects
  • WOApplication.application().cgiAdaptorURL() = http://hostname/cgi-bin/WebObjects
  • WOApplication.application().directConnectURL() = http://hostname:port/cgi-bin/WebObjects/MyApplication.woa
  • WOApplication.application().frameworksBaseURL() = /WebObjects/Frameworks
  • WOApplication.application().servletConnectURL() = http://hostname/cgi-bin/WebObjects/MyApplication.woa
  • WOApplication.application().webserverConnectURL() = http://hostname/cgi-bin/WebObjects/MyApplication.woa/-port

Browser IP

  / Returns the IP address of the client.

  • This should return accurate information whether in direct connect or webserver deployment mode.
  • If performance caching is turned on on OS X server, this method will correctly use pc-remote-addr
  • @return The IP address as a string.
         */
        public static String clientIP(WORequest request) {
            Object ipAddress = request.headerForKey("pc-remote-addr");
            if (ipAddress == null) {
                    ipAddress = request.headerForKey("remote_addr");
                    if( ipAddress == null ) {
                        ipAddress = request.headerForKey("remote_host");
                        if( ipAddress == null ) {
                            ipAddress = request._remoteAddress();
                            if( ipAddress == null ) {
                                ipAddress = request._originatingAddress();
                                if( ipAddress != null ) ipAddress = ((InetAddress)ipAddress).getHostAddress();
                            }
                        }
                    }
            }
            return ipAddress == null ? "<address unknown>" : ipAddress.toString();
        }

NSArray

It's in the docs, but NSArray's implementation of KeyValueCoding is not really what I was expecting. To get an object at a specific numeric index of an NSArray, you'd use the

 objectAtIndex() 

method. So what does

 NSArray.valueForKey(String key) 

return?

Well, first read the docs: file:///OSX/Developer/Documentation/WebObjects/Reference/com/webobjects/foundation/NSArray.html#valueForKey(java.lang.String)

It turns out that calling valueForKey on an array is the same as calling valueForKey for each element of that array. So if you have an NSArray of Users, calling valueForKey("email"); will return an NSArray of email addresses. calling valueForKey("documents"); will return an NSArray of NSArrays containing document objects. In hindsight (and from looking at the way WOBuilder handles key paths for arrays) this is kind of obvious. But I think the real lesson here is that it is easy to ignore the docs towards the end of an alphabetical page...

HTML-friendly String Truncating

  import org.apache.commons.lang.*; From Apache
  import org.clapper.util.text.*;  From http://www.clapper.org/
 
  public static String stripHTMLTagsAndConcatenate(String htmlString, int numberOfChar) {
    return (StringUtils.substringBeforeLast(StringUtils.abbreviate((HTMLUtil.stripHTMLTags(htmlString)), numberOfChar), " ")) + "...";
  }

Category:WebObjects