*  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

  }

  @Override
  public Set<Feature<? super Set>> getImpliedFeatures() {
    return implied;
  }

  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  @TesterAnnotation
  public @interface Require {
    SetFeature[] value() default {};

    SetFeature[] absent() default {};
  }

      <fields>
        <field>
          <name>groupId</name>
          <required>true</required>
          <version>1.0.0+</version>
          <type>String</type>
          <description>The group id of the dependency.</description>
        </field>
        <field>
          <name>artifactId</name>
          <required>true</required>
          <version>1.0.0+</version>
          <type>String</type>

  @Override
  public Set<Feature<? super Multiset>> getImpliedFeatures() {
    return emptySet();
  }

  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  @TesterAnnotation
  public @interface Require {
    MultisetFeature[] value() default {};

    MultisetFeature[] absent() default {};
  }

import org.gradle.api.provider.Provider
import java.io.File

fun Configuration.getSingleFileProvider(): Provider<File> {
    val name = this.name
    return incoming.files.elements.map {
        require(it.size <= 1) {
            "Expected at most one file in configuration '$name' but found: $it"
        }
        it.firstOrNull()?.asFile
    }
}

 -----

Maven Compat

 Maven2 classes maintained as compatibility layer for plugins that need to keep Maven2 compatibility.

 Plugins should avoid these classes and be updated to use only Maven3 dependencies (and require Maven3): see
 {{{https://cwiki.apache.org/confluence/display/MAVEN/Plugin+migration+to+Maven3+dependencies} Plugin migration to Maven3 dependencies}}

 * under the License.
 */
package org.apache.maven.cling.logging;

/**
 * Interface for configuration operations on loggers, which are not available in slf4j, then require per-slf4f-binding
 * implementation.
 *
 * @since 3.1.0
 */
public interface Slf4jConfiguration {
    /**
     * Level
     */
    enum Level {
        DEBUG,
        INFO,
        ERROR
    }

  }

  @Override
  public Set<Feature<? super Multimap>> getImpliedFeatures() {
    return implied;
  }

  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  @TesterAnnotation
  public @interface Require {
    MultimapFeature[] value() default {};

    MultimapFeature[] absent() default {};
  }

/** This class is for {@code com.google.common.util.concurrent} use only! */
@J2ktIncompatible
@GwtIncompatible // java.time.Duration
@IgnoreJRERequirement // We use this method only from within APIs that require a Duration.
final class Internal {

  /**
   * Returns the number of nanoseconds of the given duration without throwing or overflowing.
   *

        TaskProvider<DependencyLicensesTask> dependencyLicenses = project.getTasks()
            .register("dependencyLicenses", DependencyLicensesTask.class);

        // only require dependency licenses for non-elasticsearch deps
        dependencyLicenses.configure(t -> {
            Configuration runtimeClasspath = project.getConfigurations().getByName(JavaPlugin.RUNTIME_CLASSPATH_CONFIGURATION_NAME);