}

// tag::producer[]
java {
    registerFeature("mysqlSupport") {
        usingSourceSet(sourceSets["mysqlSupport"])
        capability("org.gradle.demo", "producer-db-support", "1.0")
        capability("org.gradle.demo", "producer-mysql-support", "1.0")
    }
    registerFeature("postgresSupport") {
        usingSourceSet(sourceSets["postgresSupport"])
        capability("org.gradle.demo", "producer-db-support", "1.0")

            }

            java {
                registerFeature('one') {
                    usingSourceSet(sourceSets.one)
                    capability('o', 'n', 'e')
                    capability('g', 'one', 'v')
                }
                registerFeature('onePreferred') {
                    usingSourceSet(sourceSets.onePref)
                    capability('o', 'n', 'e')

    mongoSupport
}

// tag::producer[]
java {
    registerFeature('mysqlSupport') {
        usingSourceSet(sourceSets.mysqlSupport)
        capability('org.gradle.demo', 'producer-db-support', '1.0')
        capability('org.gradle.demo', 'producer-mysql-support', '1.0')
    }
    registerFeature('postgresSupport') {
        usingSourceSet(sourceSets.postgresSupport)
        capability('org.gradle.demo', 'producer-db-support', '1.0')

               main211 {}
               main212 {}
            }
            java {
               registerFeature('scala211') {
                  usingSourceSet(sourceSets.main211)
               }
               registerFeature('scala212') {
                  usingSourceSet(sourceSets.main212)
               }
            }
        """
        file("src/main211/java/com/foo/Foo.java") << """
            package com.foo;

                registerFeature("withoutSources") {
                    usingSourceSet(sourceSets.withoutSources)
                }
            }

            java {
                sourceSets {
                    withSources
                }
                registerFeature("withSources") {
                    usingSourceSet(sourceSets.withSources)
                    withSourcesJar()
                }

    create("mongodbSupport") {
        java {
            srcDir("src/mongodb/java")
        }
    }
}

// tag::register_variant_extra_jars[]
java {
    registerFeature("mongodbSupport") {
        usingSourceSet(sourceSets["mongodbSupport"])
// end::register_variant[]
        withJavadocJar()
        withSourcesJar()
// tag::register_variant2[]
    }
}
// end::register_variant2[]
// end::register_variant_extra_jars[]

sourceSets {
    mongodbSupport {
        java {
            srcDir 'src/mongodb/java'
        }
    }
}

// tag::register_variant_extra_jars[]
java {
    registerFeature('mongodbSupport') {
        usingSourceSet(sourceSets.mongodbSupport)
// end::register_variant[]
        withJavadocJar()
        withSourcesJar()
// tag::register_variant2[]
    }
}
// end::register_variant2[]
// end::register_variant_extra_jars[]

        given:
        buildFile << """

            sourceSets {
                feature
            }

            java {
                registerFeature("feature") {
                    usingSourceSet(sourceSets.feature)
                }
            }

            ${ivyTestRepository()}

            dependencies {
                featureImplementation 'org:optionaldep:1.0'
            }
        """

 *
 * @since 5.3
 */
@HasInternalProtocol
public interface FeatureSpec {
    /**
     * Declares the source set which this feature is built from.
     * @param sourceSet the source set
     */
    void usingSourceSet(SourceSet sourceSet);

    /**
     * Declares a capability of this feature.
     * <p>
     * Calling this method multiple times will declare <i>additional</i>

group = 'org.gradle.demo'

sourceSets {
    mysqlSupport {
        java {
            srcDir 'src/mysql/java'
        }
    }
}

java {
    registerFeature('mysqlSupport') {
        usingSourceSet(sourceSets.mysqlSupport)
    }
}

dependencies {
    mysqlSupportImplementation 'mysql:mysql-connector-java:8.0.14'
}