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/* 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 org.activiti.engine.impl.cmd;

import org.activiti.engine.impl.db.IdBlock;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.PropertyEntity;


/**
 * @author Tom Baeyens
 */
public class GetNextIdBlockCmd implements Command {
  
  private static final long serialVersionUID = 1L;
  protected int idBlockSize;
  
  public GetNextIdBlockCmd(int idBlockSize) {
    this.idBlockSize = idBlockSize;
  }

  public IdBlock execute(CommandContext commandContext) {
    PropertyEntity property = (PropertyEntity) commandContext
      .getPropertyEntityManager()
      .findPropertyById("next.dbid");
    long oldValue = Long.parseLong(property.getValue());
    long newValue = oldValue+idBlockSize;
    property.setValue(Long.toString(newValue));
    return new IdBlock(oldValue, newValue-1);
  }
}