[GitHub] incubator-brooklyn pull request: fix dto.entries repetition errors...

[aledsage <gi...@git.apache.org>]

Github user aledsage commented on a diff in the pull request:

    https://github.com/apache/incubator-brooklyn/pull/289#discussion_r19737220
  
    --- Diff: core/src/main/java/brooklyn/catalog/internal/CatalogDto.java ---
    @@ -178,4 +182,33 @@ public String toString() {
                     .toString();
         }
     
    +    // temporary fix for issue where entries might not be unique
    +    Iterable<CatalogItemDtoAbstract<?, ?>> getUniqueEntries() {
    +        if (entries==null) return null;
    +        Map<String, CatalogItemDtoAbstract<?, ?>> result = getEntriesMap();
    +        return result.values();
    +    }
    +
    +    private Map<String, CatalogItemDtoAbstract<?, ?>> getEntriesMap() {
    +        if (entries==null) return null;
    --- End diff --
    
    Personal preference: I'm a big fan of not returning null when an `ImmutableMap.of()` means the same thing. Same for returning an `ImmutableList.of()` from `getUniqueEntries()`. It saves null guards all over the place, and NPEs when someone forgets to guard against null.


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