Re: [Webmacro-devel] Here's why I don't like the Map constructor stuff

[Eric B. R. <eb...@tc...>]

On Wednesday, July 23, 2003, at 02:30  PM, Keats wrote:

> I like having it be a Map.  For example, #eval needs a Map for the  
> "using"
> clause.  Can't we just implement a map that overrides put to allways  
> return
> an empty String?

we can.  or we can add a public void set(Object key, Object value)  
method.

#set $map = {}
$map.set("Foo", "Bar")
$map.set("Tree", "Flower")

it kinda fits along with:
#set $map.Foo = "Bar"
#set $map.Tree = "Flower"

but is useful in the cases where your keyname is $dynamic

eric

>
> Keats
> ----- Original Message -----
> From: "Eric B. Ridge" <eb...@tc...>
> To: <ma...@an...>
> Cc: <web...@li...>
> Sent: Wednesday, July 23, 2003 1:55 PM
> Subject: Re: [Webmacro-devel] Here's why I don't like the Map  
> constructor
> stuff
>
>
>> On Wednesday, July 23, 2003, at 01:47  PM, Marc Palmer wrote:
>>
>>>
>>> Hi,
>>>
>>> I thought I'd try using the #set $xxx = { } mechanism today.
>>>
>>> If you remember there was a real hoo-haa about this versus my
>>> #newobject directive (which is fine and working well in Ignition I
>>> might add!).
>>>
>>> Now I tried this:
>>>
>>> #set $x = {}
>>> #foreach $item in $myNameList
>>>   $x.put( $item, $values.get($item) )
>>> #end
>>>
>>> ...and guess what? I get all the values in the output because put()
>>> returns an Object!
>>
>> So we make {} return a special object too.  It doesn't necessarily  
>> need
>> to be a java.util.Map implementation.
>>
>> eric
>>
>>>
>>> This is really bad news. #newobject does not suffer this because I
>>> return a custom object not a Hashtable/Map that is de-Java-lized:
>>>
>>> public class WebMacroObject
>>> {
>>>    public int getCount()
>>>    public Iterator getPropertyNames()
>>>    public Iterator getPropertyValues()
>>>    public void put( String key, Object value )
>>>    public Object get( String key )
>>>    public void reset()
>>>    public void copyFrom( WebMacroObject src )
>>>    public void copyFrom( Map src )
>>> }
>>>
>>> This is much cleaner and does not suffer from the Map contract
>>> problems. This object can of course be used without #newobject, it is
>>> completely standalone. Java heads may shriek at the altered syntax,
>>> but I think it stands well in the non-Java world.
>>>
>>> Shall I commit this object to CVS and edit the { } map constructor
>>> mechanism to create an instance of this instead of the Map
>>> implementation it does now?
>>>
>>> ...or is there another solution?
>>>
>>> I feel that, like my suggestion for a list wrapper object, we should
>>> consider providing some special WM types for this kind of stuff to
>>> de-Java- lize things further and start building a small "WebMacro
>>> Object Model" in this regard, so we can document it clearly for
>>> template writers instead of referring them to API Javadocs for Map,
>>> for example.
>>>
>>> Just say the word and WebMacroObject is in CVS and { } updated to use
>>> it... and if you really feel friendly you could let me add #newobject
>>> to WM to back up the "WebMacro Object Model" :)
>>>
>>> Marc
>>> --
>>> Marc Palmer
>>> Contract Java Consultant/Developer
>>>
>>>                        w a n g j a m m e r s
>>>
>>>                 java and web software design
>>>              experts with an ethical outlook
>>>
>>>                   http://www.wangjammers.org
>>>
>>>
>>>
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>>
>>
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