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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 java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.VariableInstance;
import org.activiti.engine.impl.persistence.entity.VariableInstanceEntity;

/**

 */
public class GetTasksLocalVariablesCmd implements Command>, Serializable{


  private static final long serialVersionUID = 1L;
  protected Set taskIds;

  public GetTasksLocalVariablesCmd(Set taskIds) {
    this.taskIds = taskIds;
  }
	
	@Override
  public List execute(CommandContext commandContext) {
	  if (taskIds == null) {
	    throw new ActivitiIllegalArgumentException("taskIds is null");
    }
    if (taskIds.isEmpty()){
      throw new ActivitiIllegalArgumentException("Set of taskIds is empty");
    }
    
    List instances = new ArrayList();
    List entities = commandContext.getVariableInstanceEntityManager().findVariableInstancesByTaskIds(taskIds);
    for (VariableInstanceEntity entity : entities){
      entity.getValue();
      instances.add(entity);
    }
    
    return instances;
  }

}




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