public class InternalFlag implements InternalOption<Boolean> {
    private final String systemPropertyName;
    private final boolean defaultValue;

    public InternalFlag(String systemPropertyName) {
        this(systemPropertyName, false);
    }

    public InternalFlag(String systemPropertyName, boolean defaultValue) {
        this.systemPropertyName = systemPropertyName;
        this.defaultValue = defaultValue;
    }

    @Override

    private final String systemPropertyName;
    private final String defaultValue;

    public StringInternalOption(String systemPropertyName, String defaultValue) {
        this.systemPropertyName = systemPropertyName;
        this.defaultValue = defaultValue;
    }

    @Nullable
    @Override
    public String getSystemPropertyName() {
        return systemPropertyName;
    }

    @Override

            }
            return activeFeatures;
        }

        private final boolean active;
        private final String systemPropertyName;

        Feature(boolean active, @Nullable String systemPropertyName) {
            this.active = active;
            this.systemPropertyName = systemPropertyName;
        }

        /**
         * Returns whether the feature is still relevant.
         */

    def "flag is disabled by default"() {
        def flag = Stub(FeatureFlag)
        flag.systemPropertyName >> null

        expect:
        !flags.isEnabled(flag)
        !flags.isEnabledWithApi(flag)
    }

    def "flag with associated system property is disabled by default"() {
        def flag = Stub(FeatureFlag)
        flag.systemPropertyName >> "prop"

        expect:
        !flags.isEnabled(flag)

    private final String systemPropertyName;
    private final int defaultValue;

    public IntegerInternalOption(String systemPropertyName, int defaultValue) {
        this.systemPropertyName = systemPropertyName;
        this.defaultValue = defaultValue;
    }

    @Nullable
    @Override
    public String getSystemPropertyName() {
        return systemPropertyName;
    }

    @Override

}


private
fun InternalOptions.getInternalFlag(systemPropertyName: String, defaultValue: Boolean = false): Boolean =
    getOption(InternalFlag(systemPropertyName, defaultValue)).get()


private
fun InternalOptions.getInternalString(systemPropertyName: String, defaultValue: String?) =

        configurationCacheRunLenient "check"

        then:
        configurationCache.assertStateStored()

        when:
        configurationCacheRunLenient "-D${FeaturePreviews.Feature.STABLE_CONFIGURATION_CACHE.systemPropertyName}=true", "check"

        then:
        configurationCache.assertStateStored()
    }

    def "feature flag state is restored when running from cache"() {
        given:

        }
        executer.beforeExecute {
            inDirectory(consumer)
        }
        file("consumer/gradle.properties") << "systemProp.${VirtualFileSystemServices.MAX_HIERARCHIES_TO_WATCH_PROPERTY.systemPropertyName}=1"

        when:
        withWatchFs().run "assemble", "--info"
        then:
        executedAndNotSkipped(":includedBuild:jar")
        assertWatchedHierarchies([includedBuild])

            if (projectDependencies.add(dependency)) {
                projectScopedWriter.write(dependency)
            }
        }
    }

    override fun flagRead(flag: FeatureFlag) {
        flag.systemPropertyName?.let { propertyName ->
            sink().systemPropertyRead(propertyName, System.getProperty(propertyName))
        }
    }

    fun append(fingerprint: ProjectSpecificFingerprint) {