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