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From "Paul Stanton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (TAP5-1452) messages property lookup for enum values is inconsistent, and incorrect
Date Sat, 26 Feb 2011 22:51:58 GMT

    [ https://issues.apache.org/jira/browse/TAP5-1452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999852#comment-12999852
] 

Paul Stanton commented on TAP5-1452:
------------------------------------

Also, it's probably a good idea to return "" or null if value parameter is null.

> messages property lookup for enum values is inconsistent, and incorrect
> -----------------------------------------------------------------------
>
>                 Key: TAP5-1452
>                 URL: https://issues.apache.org/jira/browse/TAP5-1452
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-core
>    Affects Versions: 5.2.4, 5.1.0.7
>            Reporter: Paul Stanton
>            Priority: Minor
>
> I work on a project which has a few different entities each with their own specific ranges
of potential values for 'Category'. The way this project has achieved this is to inline Enums
within the entity class. Unfortunately, the classes all define an enum named "Category", ie:
> public class EntityOne
> {
>     enum Category {...};
>     private Category category;
>     ....
> }
> public class EntityTwo
> {
>     enum Category {...};
>     private Category category;
>     ....
> }
> The EnumSelectModel uses TapestryInternalUtils.getLabelForEnum(Messages messages, String
prefix, Enum value) where prefix is enumClass.getSimpleName()
> This makes it impossible to differentiate inline enums in different classes with the
same name since EntityOne.Category and EntityTwo.Category would both have the prefix "Category".
> After doing some further digging I also found that there was another way to resolve a
message for an enum value: TapestryInternalUtils.getLabelForEnum(Messages messages, Enum value)
which is used by PropertyDisplayBlocks. This method is slightly better since it would look
for EntityOne$Category instead of just Category, however I think it would be better still
to use the fully qualified name.
> I think it is important to
> a) be consistent 
> b) allow for all cases
> Here is my solution:
> 1. scrap TapestryInternalUtils.getLabelForEnum(Messages messages, String prefix, Enum
value) and move the cascading logic into TapestryInternalUtils.getLabelForEnum(Messages messages,
Enum value), update EnumSelectModel to use TapestryInternalUtils.getLabelForEnum(Messages
messages, Enum value).
> 2. change the cascading lookup logic to
>    a) test for [value.getClass().getName() + "." + value.name()]
>    b) test for [lastTerm(value.getClass().getName()) + "." + value.name()]
>    c) test for [value.getClass().getSimpleName() + "." + value.name()]
>    d) test for [value.name()]
> The code:
>     public static String getLabelForEnum(Messages messages, Enum value)
>     {
>         String key1 = value.getClass().getName() + "." + value.name();
>         if (messages.contains(key1))
>             return messages.get(key1);
>         String key2 = lastTerm(value.getClass().getName()) + "." + value.name();
>         if (messages.contains(key2))
>             return messages.get(key2);
>         String key3 = value.getClass().getSimpleName() + "." + value.name();
>         if (messages.contains(key3))
>             return messages.get(key3);
>         String key4 = value.name();
>         if (messages.contains(key4))
>             return messages.get(key4);
>         return toUserPresentable(value.name().toLowerCase());
>     }
> EnumSelectModel and PropertyDisplayBlocks could use this without issue and be fully backwards
compatible with previously defined message properties.

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