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Add isString/isBoolean/isInt/isLong/isDouble, mirroring the accepted types of the corresponding getters, so a caller can ask what a property holds without the implementation reporting a type mismatch. Without this a type-coercing decorator is impossible: the only way to learn the stored type is to call a getter, which logs a warning when it does not match. The Spring Boot starter works around it today by copying YamlDeclarativeConfigProperties wholesale. Resolves open-telemetry#8101
Pull request dashboard statusMerged · refreshed 2026-10-07 21:19 UTC Status above doesn't look right?
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YAML parsing only produces Integer and Double, so test the Long branch of isInt/isLong and the Float branch of isDouble with values built directly. Also check that the config handed to a ComponentProvider forwards the predicates to its delegate.
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| * | ||
| * <p>This is the introspection counterpart of {@link #getString(String)}: it answers whether that | ||
| * getter would return a non-null value, without the implementation reporting a type mismatch for | ||
| * a property which holds some other type. |
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Let's make these comments consistent. I see a few variants of this explanation of pairing with a corresponding get method: this, none, and "Accepts the same values {@link #getInt(String)} accepts, including a {@link Long} which that getter narrows with {@link Long#intValue()}."
I think mentioning the "implementation reporting a type mismatch" is a mistake because it implies the log warning is part of the API contract, but its actually just an implementation detail.
Should also probably mention that all these return false if the value is null.
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| @Override | ||
| public boolean isString(String name) { | ||
| Objects.requireNonNull(name, "Null configuration property name"); |
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Applies to all these.
| Objects.requireNonNull(name, "Null configuration property name"); | |
| Objects.requireNonNull(name, "name"); |
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Done in 3acc1fc for all five is<Type> methods.
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Nice - thanks! |
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2 participants
Resolves #8101
Adds
isString/isBoolean/isInt/isLong/isDoubletoDeclarativeConfigProperties, theis<Type>option agreed on in the issue.Each predicate answers "would the corresponding getter return a non-null value", using exactly the getter's accepted types —
isInt/isLongaccept bothIntegerandLong,isDoubleaccepts bothFloatandDouble. Unlike calling the getter, it never logs a type-mismatch warning, which is what makes a type-coercing decorator possible.Downstream motivation: the Spring Boot starter currently keeps a full copy of
YamlDeclarativeConfigPropertieswith coercing getters (open-telemetry/opentelemetry-java-instrumentation#15775, open-telemetry/opentelemetry-java-instrumentation#20034), because wrapping the real one triggers those warnings. That copy can be replaced by a decorator once this lands.Changes:
DeclarativeConfigProperties: five new methodsEmptyDeclarativeConfigProperties: all returnfalseYamlDeclarativeConfigProperties: implementation mirroring the gettersDeclarativeConfigContext: delegating wrapper forwards the new methodsLong/Floatconversions (built directly, since YAML parsing only yieldsInteger/Double), and forwarding through the config wrapper handed to aComponentProviderThe methods are abstract rather than
default: a default could only be built on the getters, which would reintroduce the warnings. Since this is the incubator API I assumed that is acceptable — happy to change if you'd prefer otherwise.