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   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.access;
  
  import java.sql.Connection;
  import java.sql.PreparedStatement;
  import java.sql.SQLException;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.dba.hsqldb.HSQLDBAdapter;
  
  /**
   * A helper class that handles postprocessing after the schema generation
   * operation. E.g. some databases require a checkpoint command to be run for the
   * schema changes to be flushed to disk.
   * 
   */
  class DbGeneratorPostprocessor {
  
  	private static final Map<String, HSQLDBPostprocessor> postprocessors;
  
  	static {
  		postprocessors = new HashMap<>();
  		postprocessors.put(HSQLDBAdapter.class.getName(), new HSQLDBPostprocessor());
  	}
  
  	void execute(Connection connection, DbAdapter adapter) throws SQLException {
  
  		if (adapter != null) {
  			Postprocessor postprocessor = postprocessors.get(adapter.getClass().getName());
  			if (postprocessor != null) {
  				postprocessor.execute(connection);
  			}
  		}
  	}
  
  	static abstract class Postprocessor {
  
  		abstract void execute(Connection c) throws SQLException;
  	}
  
  	static class HSQLDBPostprocessor extends Postprocessor {
  
  		@Override
  		void execute(Connection c) throws SQLException {
  
  			try (PreparedStatement st = c.prepareStatement("CHECKPOINT");) {
  				st.execute();
  			}
  		}
  	}
  }
  