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  package org.apache.cayenne.dbsync.reverse.dbimport;
  
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.configuration.runtime.DataSourceFactory;
  import org.apache.cayenne.configuration.runtime.DbAdapterFactory;
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.di.Injector;
  
  import java.util.Collection;
  import javax.sql.DataSource;
  
  /**
   * @since 4.0
   */
  public class DbImportConfigurationValidator implements Cloneable {
      private final ReverseEngineering reverseEngineering;
      private final DbImportConfiguration config;
      private final Injector injector;
  
      public DbImportConfigurationValidator(ReverseEngineering reverseEngineering, DbImportConfiguration config, Injector injector) {
          this.reverseEngineering = reverseEngineering;
          this.config = config;
          this.injector = injector;
      }
  
      public void validate() throws Exception {
          DataNodeDescriptor dataNodeDescriptor = config.createDataNodeDescriptor();
          DbAdapter adapter;
  
          try {
              DataSource dataSource = injector.getInstance(DataSourceFactory.class).getDataSource(dataNodeDescriptor);
              adapter = injector.getInstance(DbAdapterFactory.class).createAdapter(dataNodeDescriptor, dataSource);
          } catch (Exception ex) {
              throw new Exception("Error creating DataSource or DbAdapter for DataNodeDescriptor (" + dataNodeDescriptor + ")", ex);
          }
  
          if (adapter != null && !adapter.supportsCatalogsOnReverseEngineering() && !isReverseEngineeringCatalogsEmpty()) {
              String message = "Your database does not support catalogs on reverse engineering. " +
                      "It allows to connect to only one at the moment. " +
                      "Please don't note catalogs in <dbimport> configuration.";
              throw new Exception(message);
          }
      }
  
      private boolean isReverseEngineeringCatalogsEmpty() {
          Collection<Catalog> catalogs = reverseEngineering.getCatalogs();
          if (catalogs == null || catalogs.isEmpty()) {
              return true;
          }
  
          for (Catalog catalog : catalogs) {
              if (catalog.getName() != null) {
                  return false;
              }
          }
  
          return true;
      }
  }