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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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 org.camunda.bpm.engine.impl;

import org.camunda.bpm.engine.ProcessEngineConfiguration;
import org.camunda.bpm.engine.SchemaOperationsCommand;
import org.camunda.bpm.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.db.EnginePersistenceLogger;
import org.camunda.bpm.engine.impl.db.PersistenceSession;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.PropertyEntity;

/**
 * @author Tom Baeyens
 * @author Roman Smirnov
 * @author Sebastian Menski
 * @author Daniel Meyer
 */
public class SchemaOperationsProcessEngineBuild implements SchemaOperationsCommand {

  private final static EnginePersistenceLogger LOG = ProcessEngineLogger.PERSISTENCE_LOGGER;

  public Void execute(CommandContext commandContext) {
    String databaseSchemaUpdate = Context.getProcessEngineConfiguration().getDatabaseSchemaUpdate();
    PersistenceSession persistenceSession = commandContext.getSession(PersistenceSession.class);
    if (ProcessEngineConfigurationImpl.DB_SCHEMA_UPDATE_DROP_CREATE.equals(databaseSchemaUpdate)) {
      try {
        persistenceSession.dbSchemaDrop();
      } catch (RuntimeException e) {
        // ignore
      }
    }
    if ( ProcessEngineConfiguration.DB_SCHEMA_UPDATE_CREATE_DROP.equals(databaseSchemaUpdate)
      || ProcessEngineConfigurationImpl.DB_SCHEMA_UPDATE_DROP_CREATE.equals(databaseSchemaUpdate)
      || ProcessEngineConfigurationImpl.DB_SCHEMA_UPDATE_CREATE.equals(databaseSchemaUpdate)
      ) {
      persistenceSession.dbSchemaCreate();
    } else if (ProcessEngineConfiguration.DB_SCHEMA_UPDATE_FALSE.equals(databaseSchemaUpdate)) {
      persistenceSession.dbSchemaCheckVersion();
    } else if (ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE.equals(databaseSchemaUpdate)) {
      persistenceSession.dbSchemaUpdate();
    }

    return null;
  }
}