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Type:
Improvement
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Resolution: Unresolved
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Priority:
Minor - P4
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None
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Affects Version/s: None
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Component/s: BSON
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None
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Java Drivers
Because BsonValue has boolean is methods, and throwing as methods, a common pattern is:
BsonValue value; if (value.isSomeType()) { BsonSomeType valueSomeType = value.asSomeType(); // .. operate on valueSomeType }
Nested conditionals are even harder:
BsonValue value; if (value.isDocument() && value.asDocument().get("key").isInt32()) { //... dig in and get it }
By using Java 8's Optional, we can simplify these with a fluent syntax:
BsonValue value;
value.asSomeTypeOpt().ifPresent(valueSomeType => {
// valueSomeType is guaranteed to be BsonSomeType
});
Optional<BsonInt32> nested = value.asDocumentOpt()
.flatMap(doc => doc.get("key").asInt32Opt());
I can also add get*Opt methods to BsonDocument if they make sense.