openide/java/java-tests/testData/inspection/dataFlow/optionalOfNullable/OptionalOfNullableMisuse.java

import java.util.*;

class Test {
  Optional<String> getName(List<String> numbers) {
    return Optional.ofNullable(
      numbers.isEmpty() ?
      null :
      numbers.get(0));
  }

  Optional<String> getName2(List<String> numbers) {
    return Optional.ofNullable(
      numbers.isEmpty() ?
      "2" :
      numbers.get(0));
  }

  Optional<String> getName3() {
    return Optional.ofNullable(<warning descr="'Optional.ofNullable()' with null argument should be replaced with 'Optional.empty()'">null</warning>);
  }

  long field;

  Optional<Long> getName4() {
    return Optional.ofNullable(<warning descr="'Optional.ofNullable()' with non-null argument should be replaced with 'Optional.of()'">field</warning>);
  }

  Optional<String> getName5() {
    String s = "";
    return Optional.ofNullable(<warning descr="'Optional.ofNullable()' with non-null argument should be replaced with 'Optional.of()'">s</warning>);
  }

  Optional<String> testMethodRef(List<String> list) {
    return list.stream().filter(Objects::isNull).map(Optional::<warning descr="'Optional.ofNullable()' with null argument should be replaced with 'Optional.empty()'">ofNullable</warning>).findFirst().orElse(Optional.empty());
  }

  Optional<String> testMethodRef2(List<String> list) {
    return list.stream().filter(Objects::nonNull).map(Optional::<warning descr="'Optional.ofNullable()' with non-null argument should be replaced with 'Optional.of()'">ofNullable</warning>).findFirst().orElse(Optional.empty());
  }
}