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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.flags;
import java.util.Optional;
/**
* Interface for flag.
*
* @param <T> The type of the flag value (boxed for primitives)
* @param <F> The concrete subclass type of the flag
* @author hakonhall
*/
public interface Flag<T, F> {
/** The flag ID. */
FlagId id();
/** A generic type-safe method for getting {@code this}. */
F self();
/** Returns the flag serializer. */
FlagSerializer<T> serializer();
/** Returns an immutable clone of the current object, except with the dimension set accordingly. */
F with(FetchVector.Dimension dimension, String dimensionValue);
/** Same as {@link #with(FetchVector.Dimension, String)} if value is present, and otherwise returns {@code this}. */
default F with(FetchVector.Dimension dimension, Optional<String> dimensionValue) {
return dimensionValue.map(value -> with(dimension, value)).orElse(self());
}
/** Returns the value, boxed if the flag wraps a primitive type. */
T boxedValue();
}
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