Re: deprecated API
Re: deprecated API
- Subject: Re: deprecated API
- From: "Jerry W. Walker" <email@hidden>
- Date: Thu, 9 Feb 2006 14:49:48 -0500
Hi, Zac,
WOComponents are usually instantiated by another component using
WOComponent.pageWithName("<newComponentName>");
You can probably override the method
public WOComponent(WOContext aContext)
but see the API documentation on this.
The biggest gotcha for WOComponents is initialization from another
component. The code from the creating component tends to be something
like this:
public WOComponent someActionMethod()
{
// some processing...
MyNewPage nextPage = pageWithName("MyNewPage"); // 1
nextPage.takeValueForKey(aValue, "someKeyName"); // 3
nextPage.takeValueForKey(aValue, "someOtherKeyName"); // 4
return nextPage; // 5
}
The code for the created component might look like this:
public MyNewPage(WOContext context) {
super(context); // 2
}
public void appendToResponse(WOResponse r, WOContext c)
{
String saveThings1 = someKeyName; // 6
String saveThings2 = someOtherKeyName; // 7
super.appendToResponse(r, c); // 8
}
The gotcha is that the variables in the new page will not be
available or set when the page is first created. The order of
execution of the above statements is indicated by the commented
numbers at the end of the lines.
To find out why this is, see the documentation for the following:
* http://developer.apple.com/documentation/WebObjects/
Web_Applications/Articles/1_Architecture.html#//apple_ref/doc/uid/
TP40003268-SW10
* WOComponent
* WOComponent methods:
+ appendToResponse
+ takeValuesFromRequest
+ invokeAction
+ awake
+ sleep
Regards,
Jerry
On Feb 9, 2006, at 2:20 PM, zac wrote:
I'm an old java hack who is picking up webobjects. When I try to
overload a component's default constructor I get build warnings
about overloading a deprecated api. I'm wondering what the best
practices policy is for initializing components with more than one
set of parameters.
Thx,
Zac
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__ Jerry W. Walker,
WebObjects Developer/Instructor for High Performance Industrial
Strength Internet Enabled Systems
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