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Security data model and data layer security.

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package org.molgenis.data.security.auth;

import static java.util.Objects.requireNonNull;

import org.molgenis.data.DataService;
import org.molgenis.data.UnknownEntityException;
import org.molgenis.security.core.runas.RunAsSystem;
import org.springframework.stereotype.Service;

@Service
public class RoleService {
  private final DataService dataService;
  private final RoleMetadata roleMetadata;

  public RoleService(DataService dataService, RoleMetadata roleMetadata) {
    this.dataService = requireNonNull(dataService);
    this.roleMetadata = requireNonNull(roleMetadata);
  }

  @RunAsSystem
  public Role getRole(String roleName) {
    Role role =
        dataService.query(RoleMetadata.ROLE, Role.class).eq(RoleMetadata.NAME, roleName).findOne();
    if (role == null) {
      throw new UnknownEntityException(
          roleMetadata, roleMetadata.getAttribute(RoleMetadata.NAME), roleName);
    }
    return role;
  }
}