/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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 com.orientechnologies.orient.core.sql;

import java.util.Map;

import com.orientechnologies.orient.core.command.OCommandRequest;
import com.orientechnologies.orient.core.db.record.ODatabaseRecord;
import com.orientechnologies.orient.core.exception.OCommandExecutionException;

/**
 * Acts as a delegate to the real command inserting the execution of the command inside a new transaction if not yet begun.
 * 
 * @author Luca Garulli
 */
public class OCommandExecutorSQLTransactional extends OCommandExecutorSQLDelegate {
  public static final String KEYWORD_TRANSACTIONAL = "TRANSACTIONAL";

  @SuppressWarnings("unchecked")
  @Override
  public OCommandExecutorSQLTransactional parse(OCommandRequest iCommand) {
    String cmd = ((OCommandSQL) iCommand).getText();
    super.parse(new OCommandSQL(cmd.substring(KEYWORD_TRANSACTIONAL.length())));
    return this;
  }

  @Override
  public Object execute(Map<Object, Object> iArgs) {
    final ODatabaseRecord database = getDatabase();
    boolean txbegun = database.getTransaction() == null || !database.getTransaction().isActive();

    if (txbegun)
      database.begin();

    try {
      final Object result = super.execute(iArgs);

      if (txbegun)
        database.commit();

      return result;
    } catch (Exception e) {
      if (txbegun)
        database.rollback();
      throw new OCommandExecutionException("Transactional command failed", e);
    }
  }
}
