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Flatten a nested Map
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| import java.util.Map; | |
| import java.util.stream.Collectors; | |
| import java.util.stream.Stream; | |
| public class Maps { | |
| public static Map<String, Object> asFlattendMap(Map<String, Object> map) { | |
| return map.entrySet().stream() | |
| .flatMap(Maps::flatten) | |
| .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); | |
| } | |
| private static Stream<Map.Entry<String, ?>> flatten(Map.Entry<String, ?> entry) { | |
| if (entry.getValue() instanceof Map) { | |
| return ((Map<String,?>) entry.getValue()).entrySet().stream().flatMap(Maps::flatten); | |
| } | |
| return Stream.of(entry); | |
| } | |
| } |
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