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https://issues.apache.org/jira/browse/GROOVY-6745?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Eric Milles resolved GROOVY-6745.
---------------------------------
Resolution: Fixed
This prints "humananimal":
{code:groovy}
def isA(Supplier<String>... suppliers) {
String temp = ""
for(int i=0; i<suppliers.length; i++) {
temp = temp + suppliers[i].get()
}
return temp
}
print isA({'human'},{'animal'})
{code}
> Java8 Lambda var args and Closures
> ----------------------------------
>
> Key: GROOVY-6745
> URL: https://issues.apache.org/jira/browse/GROOVY-6745
> Project: Groovy
> Issue Type: Improvement
> Affects Versions: 2.3.0-beta-2
> Reporter: Stephen Mallette
> Priority: Major
>
> Text below is taken from this thread in the mailing list:
> http://groovy.markmail.org/thread/xgw5g4fdolxssjj6
> Please see this simple Java8 class:
> {code:java}
> import java.util.function.*;
> class Marko {
> public isA(Supplier<String> supplier) {
> return supplier.get();
> }
> public isA(Supplier<String>... suppliers) {
> String temp = "";
> for(int i=0; i<suppliers.length; i++) {
> temp = temp + suppliers[i].get();
> }
> return temp;
> }
> }
> {code}
> I am delighted that Groovy 2.3.0-beta-2 supports the following
> auto-conversion from closure to Java8 lambda.
> {code:none}
> gremlin> m.isA{'human'}
> ==>human
> {code}
> However, note the issue with the Supplier[] var args method call.
> {code:none}
> gremlin> m.isA{'human'}{'animal'}
> No signature of method: Marko.isA() is applicable for argument types:
> (groovysh_evaluate$_run_closure1, groovysh_evaluate$_run_closure2) values:
> [groovysh_evaluate$_run_closure1@39d9314d,
> groovysh_evaluate$_run_closure2@b978d10]
> Possible solutions: isA([Ljava.util.function.Supplier;),
> isA(java.util.function.Supplier), is(java.lang.Object), find(), any(),
> use([Ljava.lang.Object;)
> Display stack trace? [yN]
> gremlin> m.isA({'human'}{'animal'})
> No signature of method: Marko.isA() is applicable for argument types:
> (java.lang.String) values: [human]
> Possible solutions: isA([Ljava.util.function.Supplier;),
> isA(java.util.function.Supplier), is(java.lang.Object),
> use([Ljava.lang.Object;), find(), any()
> Display stack trace? [yN]
> gremlin>
> {code}
> It is interesting to note that this conversion works:
> {code:none}
> gremlin> suppliers = [{'human'},{'animal'}] as Supplier[]
> ==>groovysh_evaluate$_run_closure1@727eb8cb
> ==>groovysh_evaluate$_run_closure2@39d9314d
> gremlin> m.isA(suppliers)
> ==>humananimal
> {code}
> It would be sweet if 2.3.0 GA provided support for auto conversion of closure
> var args to Java8 function var args.
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