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  package org.apache.cayenne.dbsync.merge.token.model;
  
  import org.apache.cayenne.dbsync.merge.context.EntityMergeSupport;
  import org.apache.cayenne.dbsync.merge.context.MergerContext;
  import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
  import org.apache.cayenne.dbsync.merge.token.MergerToken;
  import org.apache.cayenne.map.DbAttribute;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.ObjEntity;
  
  /**
   * A {@link MergerToken} to add a {@link DbAttribute} to a {@link DbEntity}. The
   * {@link EntityMergeSupport} will be used to update the mapped {@link ObjEntity}
   */
  public class AddColumnToModel extends AbstractToModelToken.EntityAndColumn {
  
      public AddColumnToModel(DbEntity entity, DbAttribute column) {
          super("Add Column", 55, entity, column);
      }
  
      @Override
      public MergerToken createReverse(MergerTokenFactory factory) {
          return factory.createDropColumnToDb(getEntity(), getColumn());
      }
  
      @Override
      public void execute(MergerContext mergerContext) {
          getEntity().addAttribute(getColumn());
  
          for (ObjEntity e : getMappedObjEntities()) {
              mergerContext.getEntityMergeSupport().synchronizeOnDbAttributeAdded(e, getColumn());
          }
  
          mergerContext.getDelegate().dbAttributeAdded(getColumn());
      }
  
  }
  