import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Immutable;

import static org.apache.maven.api.ExtensibleEnums.language;

/**
 * Language.
 * <p>
 * This extensible enum has two defined values, {@link #NONE} and {@link #JAVA_FAMILY},
 * but can be extended by registering a {@code org.apache.maven.api.spi.LanguageProvider}.
 * <p>

import org.apache.maven.project.MavenProject;

/**
 * Holds data relevant for an execution event.
 *
 */
public interface ExecutionEvent {

    /**
     * The possible types of execution events.
     */
    enum Type {
        ProjectDiscoveryStarted,
        SessionStarted,
        SessionEnded,
        ProjectSkipped,
        ProjectStarted,
        ProjectSucceeded,
        ProjectFailed,
        MojoSkipped,

        assertThat(pd.getElementClassOfCollection(), is(sameClass(Enum.class)));

        pcd = pd.getParameterizedClassDesc();
        assertThat(pcd.getRawClass(), is(sameClass(Set.class)));
        assertThat(pcd.getArguments().length, is(1));
        assertThat(pcd.getArguments()[0].getRawClass(), is(sameClass(Enum.class)));
    }

    /**
     * @throws Exception
     */

                "count",
                (ms, o) -> {
                  int unused = ms.count(o);
                },
                Math::log)));
  }

  /** All the ways to create an ImmutableMultiset. */
  enum ConstructionPathway implements Construction<Multiset<Object>> {
    COPY_OF_COLLECTION {
      @Override
      public ImmutableMultiset<Object> create(List<?> keys) {
        return ImmutableMultiset.copyOf(keys);
      }

 *
 * @author Osvaldo Doederlein
 */
public class ToStringHelperBenchmark {

  @Param({"0", "1", "5"})
  int dataSize;

  @Param({"false", "true"})
  boolean omitNulls;

  enum Dataset {
    SMALL {
      @Override
      void addEntries(MoreObjects.ToStringHelper helper) {
        helper
            .add(SHORT_NAME, 10)
            .addValue(10L)
            .add(SHORT_NAME, 3.14f)

 * that exhibits the problem.
 *
 */
public interface Problem {

    /**
     * The different severity levels for a problem, in decreasing order.
     */
    enum Severity {
        FATAL, //
        ERROR, //
        WARNING //
    }

    /**
     * Gets the hint about the source of the problem. While the syntax of this hint is unspecified and depends on the

import java.util.concurrent.Executor;

/**
 * An {@link Executor} that runs each task in the thread that invokes {@link Executor#execute
 * execute}.
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
enum DirectExecutor implements Executor {
  INSTANCE;

  @Override
  public void execute(Runnable command) {
    command.run();
  }

  @Override
  public String toString() {

import java.util.concurrent.Executor;

/**
 * An {@link Executor} that runs each task in the thread that invokes {@link Executor#execute
 * execute}.
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
enum DirectExecutor implements Executor {
  INSTANCE;

  @Override
  public void execute(Runnable command) {
    command.run();
  }

  @Override
  public String toString() {

import java.util.Set;
import junit.framework.TestCase;

/**
 * Tests for {@link Enums}.
 *
 * @author Steve McKay
 */
@GwtIncompatible
@J2ktIncompatible
public class EnumsTest extends TestCase {

  private enum TestEnum {
    CHEETO,
    HONDA,
    POODLE,
  }

  public void testGetIfPresent() {
    assertThat(Enums.getIfPresent(TestEnum.class, "CHEETO")).hasValue(TestEnum.CHEETO);

public @interface Config {

    Source source() default Source.USER_PROPERTIES;

    String type() default "java.lang.String";

    String defaultValue() default "";

    boolean readOnly() default false;

    enum Source {
        USER_PROPERTIES,
        MODEL
    }