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  package org.apache.cayenne.dbsync.merge.token.db;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dbsync.merge.context.MergeDirection;
  import org.apache.cayenne.dbsync.merge.context.MergerContext;
  import org.apache.cayenne.dbsync.merge.token.AbstractMergerToken;
  import org.apache.cayenne.dbsync.merge.token.MergerToken;
  import org.apache.cayenne.log.JdbcEventLogger;
  import org.apache.cayenne.map.DbAttribute;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.validation.SimpleValidationFailure;
  
  import java.sql.Connection;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.List;
  
  /**
   * Common abstract superclass for all {@link MergerToken}s going from the model
   * to the database.
   */
  public abstract class AbstractToDbToken extends AbstractMergerToken {
  
  	protected AbstractToDbToken(String tokenName, int sortingWeight) {
  		super(tokenName, sortingWeight);
  	}
  
  	@Override
  	public void execute(MergerContext mergerContext) {
  		for (String sql : createSql(mergerContext.getDataNode().getAdapter())) {
  			executeSql(mergerContext, sql);
  		}
  	}
  
  	void executeSql(MergerContext mergerContext, String sql) {
  		JdbcEventLogger logger = mergerContext.getDataNode().getJdbcEventLogger();
  		logger.log(sql);
  
  		try (Connection conn = mergerContext.getDataNode().getDataSource().getConnection()) {
  			try (Statement st = conn.createStatement()) {
  				st.execute(sql);
  			}
  		} catch (SQLException e) {
  			mergerContext.getValidationResult().addFailure(new SimpleValidationFailure(sql, e.getMessage()));
  			logger.logQueryError(e);
  		}
  	}
  
  	public abstract List<String> createSql(DbAdapter adapter);
  
  	@Override
  	public final MergeDirection getDirection() {
  		return MergeDirection.TO_DB;
  	}
  
  	abstract static class Entity extends AbstractToDbToken {
  
  		private final DbEntity entity;
  
  		protected Entity(String tokenName, int sortingWeight, DbEntity entity) {
  			super(tokenName, sortingWeight);
  			this.entity = entity;
  		}
  
  		public DbEntity getEntity() {
  			return entity;
  		}
  
  		public String getTokenValue() {
  			return getEntity().getName();
  		}
  	}
  
  	abstract static class EntityAndColumn extends Entity {
  
  		private final DbAttribute column;
  
  		protected EntityAndColumn(String tokenName, int sortingWeight, DbEntity entity, DbAttribute column) {
  			super(tokenName, sortingWeight, entity);
  			this.column = column;
  		}
  
  		public DbAttribute getColumn() {
  			return column;
  		}
  
  		@Override
  		public String getTokenValue() {
  			return getEntity().getName() + "." + getColumn().getName();
  		}
  	}
  }
  