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#355 handle case when there are no child elements for the given key

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qza
2016-06-02 07:32:48 +02:00
parent 43f90ead48
commit f3110de130
2 changed files with 11 additions and 4 deletions
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7
abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java
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@ -3,6 +3,7 @@ package com.iluwatar.abstractdocument;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Stream;
@ -28,11 +29,11 @@ public abstract class AbstractDocument implements Document {
@Override
public <T> Stream<T> children(String key, Function<Map<String, Object>, T> constructor) {
return Stream.of(get(key))
Optional<List<Map<String, Object>>> any = Stream.of(get(key))
.filter(el -> el != null)
.map(el -> (List<Map<String, Object>>) el)
.findAny().get().stream()
.map(constructor);
.findAny();
return any.isPresent() ? any.get().stream().map(constructor) : Stream.empty();
}
@Override