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SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.

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/*
========================================================================
SchemaCrawler
http://www.schemacrawler.com
Copyright (c) 2000-2017, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------

SchemaCrawler is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.

You may elect to redistribute this code under any of these licenses.

The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html

The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/

========================================================================
*/
package schemacrawler.tools.executable;


import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import schemacrawler.schema.Catalog;
import schemacrawler.schemacrawler.SchemaCrawlerException;

/**
 * Allows chaining multiple executables with the same configuration. The
 * catalog is obtained just once, and passed on from executable to
 * executable for efficiency in execution.
 */
abstract class BaseCommandChainExecutable
  extends BaseStagedExecutable
{

  private static final Logger LOGGER = Logger
    .getLogger(BaseCommandChainExecutable.class.getName());

  private final List executables;
  protected final CommandRegistry commandRegistry;

  protected BaseCommandChainExecutable(final String command)
    throws SchemaCrawlerException
  {
    super(command);

    commandRegistry = new CommandRegistry();
    executables = new ArrayList<>();
  }

  public final Executable addNext(final Executable executable)
  {
    if (executable != null)
    {
      executables.add(executable);
    }
    return executable;
  }

  protected final void executeChain(final Catalog catalog,
                                    final Connection connection)
    throws Exception
  {
    if (executables.isEmpty())
    {
      LOGGER.log(Level.INFO, "No commands to execute");
      return;
    }

    for (final Executable executable: executables)
    {
      if (executable instanceof BaseStagedExecutable)
      {
        ((BaseStagedExecutable) executable).executeOn(catalog, connection);
      }
    }
  }

}