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https://issues.apache.org/jira/browse/FLINK-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108931#comment-14108931
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Stephan Ewen commented on FLINK-1062:
-------------------------------------
A simple type on extracting simple return types of methods like {{map()}},
{{join()}}, etc
{code}
public static Class<?>[] getTypesFromSerializedLambda(SerializedLambda sl)
throws Exception {
String sig = sl.getImplMethodSignature();
if (!sig.startsWith("(")) {
throw new Exception("Parse Error");
}
String parameters = sig.substring(1, sig.indexOf(')'));
String[] params = parameters.split(";");
List<Class<?>> classes = new ArrayList<>();
for (String p : params) {
if (!p.startsWith("L")) {
throw new Exception("Parse Error");
}
p = p.substring(1);
p = p.replace('/', '.');
classes.add(Class.forName(p));
}
return (Class<?>[]) classes.toArray(new Class<?>[classes.size()]);
}
{code}
> Type Extraction for Lambdas
> ---------------------------
>
> Key: FLINK-1062
> URL: https://issues.apache.org/jira/browse/FLINK-1062
> Project: Flink
> Issue Type: Improvement
> Components: Java API
> Affects Versions: 0.7-incubating
> Reporter: Stephan Ewen
> Fix For: 0.7-incubating
>
>
> Lambdas currently work only for {{filter}} and {{reduce(a,b)}}, because
> Lambda type extraction is not in place right now.
> We need to extend the type extraction for lambdas to support the other
> functions.
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