fe/src/main/java/org/apache/impala/authorization/sentry/SentryAuthorizable.java

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package org.apache.impala.authorization.sentry;

import com.google.common.base.Preconditions;
import org.apache.impala.authorization.Authorizable;
import org.apache.sentry.core.model.db.DBModelAuthorizable;

import java.util.List;
import java.util.stream.Collectors;

/**
 * A base class for Authorizable with Sentry specific operations.
 */
public abstract class SentryAuthorizable extends Authorizable {
  /*
   * Returns the list of the Authorizable objects in their hierarchical order.
   * For example:
   * [Column] would return Db -> Table -> Column
   * [Table] would return Db -> Table
   * [Db] would return [Db]
   * [URI] would return [URI]
   */
  public abstract List<Authorizable> getAuthorizableHierarchy();

  /**
   * Returns the list of the Sentry DBModelAuthorizable objects in their hierarchical
   * order.
   */
  public List<DBModelAuthorizable> getDBModelAuthorizableHierarchy() {
    return getAuthorizableHierarchy().stream()
        .map(a -> {
          Preconditions.checkState(a instanceof SentryAuthorizable);
          return ((SentryAuthorizable) a).getDBModelAuthorizable();
        })
        .collect(Collectors.toList());
  }

  /**
   * Returns the Sentry DBModelAuthorizable that represents the type
   * of Authorizable.
   */
  public abstract DBModelAuthorizable getDBModelAuthorizable();
}