br.com.objectos.schema.AbstractMigration Maven / Gradle / Ivy

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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package br.com.objectos.schema;

import java.util.Objects;

import br.com.objectos.db.Dialect;

/**
 * @author [email protected] (Marcio Endo)
 */
public abstract class AbstractMigration {

  private Configuration configuration;

  public final synchronized void configure(Configuration configuration) {
    if (this.configuration != null) {
      throw new IllegalStateException("Re-entry is not allowed.");
    }

    this.configuration = Objects.requireNonNull(configuration, "builder");
    try {
      configure();
    } finally {
      this.configuration = null;
    }
  }

  public String toString(Dialect dialect) {
    RecordingConfiguration c = new RecordingConfiguration();
    configure(c);
    return c.toString(dialect);
  }

  protected abstract void configure();

  protected final AlterTableDsl alterTable(String tableName) {
    return configuration.alterTable(tableName);
  }

  protected final CreateTableDsl createTable(String tableName) {
    return configuration.createTable(tableName);
  }

}