Package com.launchdarkly.sdk

Class EvaluationDetail<T>

java.lang.Object

com.launchdarkly.sdk.EvaluationDetail<T>

Type Parameters:

T - the type of the wrapped value

All Implemented Interfaces:

JsonSerializable

public final class EvaluationDetail<T>
extends java.lang.Object
implements JsonSerializable

An object returned by the SDK's "variation detail" methods such as boolVariationDetail, combining the result of a flag evaluation with an explanation of how it was calculated.

EvaluationReason can be converted to and from JSON in any of these ways:

1. With JsonSerialization.
2. With Gson, if and only if you configure your Gson instance with LDGson.
3. With Jackson, if and only if you configure your ObjectMapper instance with LDJackson.

Note: There is currently a limitation regarding deserialization for generic types. If you use Gson, you must pass a `TypeToken` to specify the runtime type of EvaluationDetail<T>, or else it will assume that `T` is `LDValue`. If you use either JsonSerialization or Jackson, there is no way to specify the runtime type and you will always get an EvaluationDetail<LDValue>. That is only for deserialization; serialization will always use the correct value type.

Field Summary

Fields

Modifier and Type	Field	Description
static int	NO_VARIATION	If getVariationIndex() is equal to this constant, it means no variation was chosen (evaluation failed and returned a default value).

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object other)
static EvaluationDetail<LDValue>	error(EvaluationReason.ErrorKind errorKind, LDValue defaultValue)	Shortcut for creating an instance with an error result.
static <T> EvaluationDetail<T>	fromValue(T value, int variationIndex, EvaluationReason reason)	Factory method for an arbitrary value.
EvaluationReason	getReason()	An object describing the main factor that influenced the flag evaluation value.
T	getValue()	The result of the flag evaluation.
int	getVariationIndex()	The index of the returned value within the flag's list of variations, e.g.
int	hashCode()
boolean	isDefaultValue()	Returns true if the flag evaluation returned the default value, rather than one of the flag's variations.
java.lang.String	toString()	Returns a simple string representation of this instance.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

NO_VARIATION

public static final int NO_VARIATION

If getVariationIndex() is equal to this constant, it means no variation was chosen (evaluation failed and returned a default value).

See Also:

Constant Field Values

Method Detail

fromValue

public static <T> EvaluationDetail<T> fromValue(T value,
                                                int variationIndex,
                                                EvaluationReason reason)

Factory method for an arbitrary value.

Type Parameters:

T - the type of the value

Parameters:

value - a value of the desired type

variationIndex - a variation index, or NO_VARIATION (any negative number will be changed to NO_VARIATION)

reason - an EvaluationReason (should not be null)

Returns:

an EvaluationDetail

error

public static EvaluationDetail<LDValue> error(EvaluationReason.ErrorKind errorKind,
                                              LDValue defaultValue)

Shortcut for creating an instance with an error result.

Parameters:

errorKind - the type of error

defaultValue - the application default value

Returns:

an EvaluationDetail

getReason

public EvaluationReason getReason()

An object describing the main factor that influenced the flag evaluation value.

Returns:

an EvaluationReason

getVariationIndex

public int getVariationIndex()

The index of the returned value within the flag's list of variations, e.g. 0 for the first variation, or NO_VARIATION.

Returns:

the variation index if applicable

getValue

public T getValue()

The result of the flag evaluation. This will be either one of the flag's variations or the default value that was passed to the variation method.

Returns:

the flag value

isDefaultValue

public boolean isDefaultValue()

Returns true if the flag evaluation returned the default value, rather than one of the flag's variations. If so, getVariationIndex() will be NO_VARIATION.

Returns:

true if this is the default value

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Returns a simple string representation of this instance.

This is a convenience method for debugging and any other use cases where a human-readable string is helpful. The exact format of the string is subject to change; if you need to make programmatic decisions based on the object's properties, use other methods like getValue().

Overrides:

toString in class java.lang.Object