}

    public static String key(String groupId, String artifactId, String version) {
        notBlank(groupId, "groupId can neither be null, empty nor blank");
        notBlank(artifactId, "artifactId can neither be null, empty nor blank");
        notBlank(version, "version can neither be null, empty nor blank");

        return groupId + ":" + artifactId + ":" + version;
    }

    private static void notBlank(String str, String message) {

import static org.junit.jupiter.api.Assertions.assertNull;

class MavenModelMergerTest {
    private MavenModelMerger modelMerger = new MavenModelMerger();

    // modelVersion is neither inherited nor injected
    @Test
    void testMergeModel_ModelVersion() {
        Model parent = Model.newBuilder().modelVersion("4.0.0").build();
        Model model = Model.newInstance();

import com.google.common.annotations.GwtCompatible;

/**
 * Indicates whether an endpoint of some range is contained in the range itself ("closed") or not
 * ("open"). If a range is unbounded on a side, it is neither open nor closed on that side; the
 * bound simply does not exist.
 *
 * @since 10.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public enum BoundType {

  public RemovalCause getCause() {
    return cause;
  }

  /**
   * Returns {@code true} if there was an automatic removal due to eviction (the cause is neither
   * {@link RemovalCause#EXPLICIT} nor {@link RemovalCause#REPLACED}).
   */
  public boolean wasEvicted() {
    return cause.wasEvicted();
  }

  private static final long serialVersionUID = 0;

     *
     * @return the activated file model, never {@code null}.
     */
    @Nonnull
    Model getActivatedFileModel();

    /**
     * Gets the file model + build pom transformation, without inheritance nor interpolation.
     *
     * @return The raw model, never {@code null}.
     */
    @Nonnull
    Model getRawModel();

    /**
     * Gets the assembled model with inheritance, interpolation and profile injection.

   * array nor its contents can be null, but it is not useful to force the use of {@code
   * requireNonNull} or the like just to assert that.
   *
   * <p>{@code EqualsTester} will always check that every object it is given returns false from
   * {@code equals(null)}, so it is neither useful nor allowed to include a null value in any
   * equality group.
   */

import com.google.common.annotations.GwtCompatible;

/**
 * Indicates whether an endpoint of some range is contained in the range itself ("closed") or not
 * ("open"). If a range is unbounded on a side, it is neither open nor closed on that side; the
 * bound simply does not exist.
 *
 * @since 10.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public enum BoundType {

  SIZE {
    @Override
    boolean wasEvicted() {
      return true;
    }
  };

  /**
   * Returns {@code true} if there was an automatic removal due to eviction (the cause is neither
   * {@link #EXPLICIT} nor {@link #REPLACED}).
   */
  abstract boolean wasEvicted();

        context.setValue(expression, value);
    }

    /*
    public int containerCountForUri( String uri )
        throws IOException
    {
        Validate.notEmpty( uri, "uri can neither be null nor empty " );
        ModelDataSource source = new DefaultModelDataSource();
        source.init( domainModel.getModelProperties(), null );
        return source.queryFor( uri ).size();
    }
    */

  SIZE {
    @Override
    boolean wasEvicted() {
      return true;
    }
  };

  /**
   * Returns {@code true} if there was an automatic removal due to eviction (the cause is neither
   * {@link #EXPLICIT} nor {@link #REPLACED}).
   */
  abstract boolean wasEvicted();