[stringtemplate-interest] Use case supported by ST?

[Ronald Muller]

Thanks Joshua.

I also came to the conclusion I have to modify my domain class. I was
looking for something more simple. Calling Collection#contains() has no side
effects, so i expected it to be available in ST.

Regards,

Ronald

2010/2/5 Joshua Royalty <royalpeasantry at gmail.com>

> I'm new, but given that ST only allows you to check for not null/null or
> true/false I don't believe you can generate it from the EnumSet.  I believe
> you need to do some preprocessing and build a map from CheckListItem to
> Boolean for the contains part.
>
> I'm pretty sure this was a deliberate design decision to enforce strict
> model-view separation.
>
> EX:
> public class App {
>     public enum ChecklistItem {
>         Test1, Test2, Test3, Test4, Test5;
>
>         public String getTitle() {
>             return name();
>         }
>     }
>
>     public static void main(String[] args) throws Exception {
>         final EnumSet<ChecklistItem> checklist =
> EnumSet.of(ChecklistItem.Test1, ChecklistItem.Test3);
>         final EnumMap<ChecklistItem, Boolean> checklistContents = new
> EnumMap<ChecklistItem, Boolean>(ChecklistItem.class);
>
>         for (ChecklistItem item : ChecklistItem.values()) {
>             checklistContents.put(item, checklist.contains(item));
>         }
>         StringTemplate checks = new StringTemplate("<checklist.keys:{ k |
> <k.title>: <if(checklist.(k))>Yes<else>No<endif>\n}>",
> AngleBracketTemplateLexer.class);
>         checks.setAttribute("checklist", checklistContents);
>         System.out.println(checks.toString());
>     }
> }
>
> A slightly more compact form of synax, ST will create the map for you but I
> think it is slightly less efficient because I think this ends up being a
> List<Map<String, Object>> instead of an EnumMap<CheckListItem, Boolean>, so
> it takes up alot more space plus it takes computation time when parsing the
> attribute.
>
> public class App {
>     public enum ChecklistItem {
>         Test1, Test2, Test3, Test4, Test5;
>
>         public String getTitle() {
>             return name();
>         }
>     }
>
>     public static void main(String[] args) throws Exception {
>         final EnumSet<ChecklistItem> checklist =
> EnumSet.of(ChecklistItem.Test1, ChecklistItem.Test3);
>         StringTemplate checks = new StringTemplate("<checklist:{ v |
> <v.item.title>: <if(v.contains)>Yes<else>No<endif>\n}>",
> AngleBracketTemplateLexer.class);
>
>         for (ChecklistItem item : ChecklistItem.values()) {
>             checks.setAttribute("checklist.{item, contains}", item,
> checklist.contains(item));
>         }
>         System.out.println(checks.toString());
>     }
> }
>
> Look at http://www.antlr.org/wiki/display/ST/Expressions for more
> information.
> -Josh
>
> On Fri, Feb 5, 2010 at 12:27 AM, Ronald Muller <ronald.k.muller at gmail.com>wrote:
>
>> In the set are enums. I have to print "yes" if the set contains the value,
>> "No" otherwise. So in java code:
>>
>> final EnumSet<ChecklistItem> checklist = ....
>> for (ChecklistItem item : ChecklistItem.values()) {
>>       println(item.getTitle() + ": " + checklist.contains(item) ? "Yes" :
>> "No");
>> }
>>
>> Regards,
>>
>> Ronald
>>
>> 2010/2/3 Terence Parr <parrt at cs.usfca.edu>
>>
>>>
>>> On Feb 3, 2010, at 2:05 AM, Ronald Muller wrote:
>>>
>>> > Hi,
>>> >
>>> > I have the following use case:
>>> >
>>> > I have to list items and display "Yes" or "No" if they are present in a
>>> set (Checklist items in my case, modeled as enums), So:
>>> >
>>> > Task1: Yes
>>> > Task2: No
>>> > Task3: No
>>> > ...
>>>
>>> Hi.  What's in the set? must be an object with string/boolean?  wouldn't
>>> this work then
>>>
>>> $yourdomainobject.checkList:{o | $o.str$: $o.bool$}$
>>>
>>> Ter
>>>
>>>
>>
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>>
>
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