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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.Collection;
import java.util.Map;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TaskEntity;
import org.activiti.engine.task.Task;

/**


 */
public class GetTaskVariablesCmd implements Command>, Serializable {

  private static final long serialVersionUID = 1L;
  protected String taskId;
  protected Collection variableNames;
  protected boolean isLocal;

  public GetTaskVariablesCmd(String taskId, Collection variableNames, boolean isLocal) {
    this.taskId = taskId;
    this.variableNames = variableNames;
    this.isLocal = isLocal;
  }

  public Map execute(CommandContext commandContext) {
    if (taskId == null) {
      throw new ActivitiIllegalArgumentException("taskId is null");
    }

    TaskEntity task = commandContext.getTaskEntityManager().findById(taskId);

    if (task == null) {
      throw new ActivitiObjectNotFoundException("task " + taskId + " doesn't exist", Task.class);
    }

    if (variableNames == null) {

      if (isLocal) {
        return task.getVariablesLocal();
      } else {
        return task.getVariables();
      }

    } else {

      if (isLocal) {
        return task.getVariablesLocal(variableNames, false);
      } else {
        return task.getVariables(variableNames, false);
      }

    }

  }
}