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   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.modeler.action;
  
  import java.util.prefs.Preferences;
  
  import org.apache.cayenne.modeler.Application;
  import org.apache.cayenne.modeler.dialog.db.DataSourceWizard;
  import org.apache.cayenne.modeler.pref.DBConnectionInfo;
  import org.apache.cayenne.modeler.pref.DataMapDefaults;
  import org.apache.cayenne.modeler.util.CayenneAction;
  
  import static org.apache.cayenne.modeler.pref.DBConnectionInfo.*;
  
  /**
   * Base action that provides DBConnectionInfo for the current DataMap or calls {@link DataSourceWizard} dialog to
   * create one.
   *
   * @since 4.2
   */
  public abstract class DBConnectionAwareAction extends CayenneAction {
  
      public DBConnectionAwareAction(String name, Application application) {
          super(name, application);
      }
  
      protected DBConnectionInfo getConnectionInfo(String title) {
          DBConnectionInfo connectionInfo;
          if (datamapPrefNotExist()) {
              DataSourceWizard connectWizard = getDataSourceWizard(title);
              if (connectWizard == null) {
                  return null;
              }
              connectionInfo = connectWizard.getConnectionInfo();
              saveConnectionInfo(connectWizard);
          } else {
              connectionInfo = getConnectionInfoFromPreferences();
          }
          return connectionInfo;
      }
  
      protected DataSourceWizard getDataSourceWizard(String title, String[] buttons) {
          DataSourceWizard connectWizard = new DataSourceWizard(getProjectController(), title, buttons);
          if (!connectWizard.startupAction()) {
              return null;
          }
          return connectWizard;
      }
  
      protected DataSourceWizard getDataSourceWizard(String title) {
          DataSourceWizard connectWizard = new DataSourceWizard(getProjectController(), title);
          if (!connectWizard.startupAction()) {
              return null;
          }
          return connectWizard;
      }
  
      protected boolean datamapPrefNotExist() {
          Preferences dataMapPreference = getProjectController().
                  getDataMapPreferences(getProjectController().getCurrentDataMap())
                  .getCurrentPreference();
          return dataMapPreference == null || dataMapPreference.get(URL_PROPERTY, null) == null;
      }
  
      protected DBConnectionInfo getConnectionInfoFromPreferences() {
          DBConnectionInfo connectionInfo = new DBConnectionInfo();
          DataMapDefaults dataMapDefaults = getProjectController()
                  .getDataMapPreferences(getProjectController().getCurrentDataMap());
          connectionInfo.setDbAdapter(dataMapDefaults.getCurrentPreference().get(DB_ADAPTER_PROPERTY, null));
          connectionInfo.setUrl(dataMapDefaults.getCurrentPreference().get(URL_PROPERTY, null));
          connectionInfo.setUserName(dataMapDefaults.getCurrentPreference().get(USER_NAME_PROPERTY, null));
          connectionInfo.setPassword(dataMapDefaults.getCurrentPreference().get(PASSWORD_PROPERTY, null));
          connectionInfo.setJdbcDriver(dataMapDefaults.getCurrentPreference().get(JDBC_DRIVER_PROPERTY, null));
          return connectionInfo;
      }
  
      protected void saveConnectionInfo(DataSourceWizard connectWizard) {
          DataMapDefaults dataMapDefaults = getProjectController().
                  getDataMapPreferences(getProjectController().getCurrentDataMap());
  
          String dbAdapter = connectWizard.getConnectionInfo().getDbAdapter();
          if(dbAdapter != null) {
              dataMapDefaults.getCurrentPreference().put(DB_ADAPTER_PROPERTY, dbAdapter);
          } else {
              dataMapDefaults.getCurrentPreference().remove(DB_ADAPTER_PROPERTY);
          }
          dataMapDefaults.getCurrentPreference().put(URL_PROPERTY, connectWizard.getConnectionInfo().getUrl());
          dataMapDefaults.getCurrentPreference().put(USER_NAME_PROPERTY, connectWizard.getConnectionInfo().getUserName());
          dataMapDefaults.getCurrentPreference().put(PASSWORD_PROPERTY, connectWizard.getConnectionInfo().getPassword());
          dataMapDefaults.getCurrentPreference().put(JDBC_DRIVER_PROPERTY, connectWizard.getConnectionInfo().getJdbcDriver());
      }
  }
  