[jira] [Updated] (GROOVY-10893) collectEntries one or more entry values for each iteration but not zero

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-10893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles updated GROOVY-10893:
---------------------------------
    Issue Type: Improvement  (was: Bug)

> collectEntries one or more entry values for each iteration but not zero
> -----------------------------------------------------------------------
>
>                 Key: GROOVY-10893
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10893
>             Project: Groovy
>          Issue Type: Improvement
>            Reporter: Eric Milles
>            Priority: Minor
>
> The {{collectEntries}} extension methods accept one entry (as an entry, array, list or map).  And it accepts multiple entries (via a map).  However, it does not let you return no entry (as null).  You can probably return an empty map...
> Similar to {{findResults}}, I'd like to be able to conditionally return an entry or entries:
> {code:groovy}
> def map = list.collectEntries { item ->
>   if (item ...) {
>     def key = ..., val = ...;
>     Collections.singletonMap(key, val)
>   }
> }
> {code}
> {{org.codehaus.groovy.runtime.DefaultGroovyMethods#addEntry(Map,Object)}} could check for null before calling {{asType(newEntry, Map.Entry.class)}}.
> {{collectMany}} has a similar issue.  I need to write "if (x) { y } else { Collections.emptyList() }" instead of just "if (x) { y }" in the closure block.  A simple null check in {{org.codehaus.groovy.runtime.DefaultGroovyMethods#collectMany(Iterable,Collection,Closure)` could take care of this.



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