/* 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.camunda.bpm.engine.impl.cmd;
import java.io.Serializable;
import org.camunda.bpm.engine.TaskAlreadyClaimedException;
import org.camunda.bpm.engine.history.UserOperationLogEntry;
import org.camunda.bpm.engine.impl.interceptor.Command;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.TaskEntity;
import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNotNull;
/**
* @author Joram Barrez
*/
public class ClaimTaskCmd implements Command<Void>, Serializable {
private static final long serialVersionUID = 1L;
protected String taskId;
protected String userId;
public ClaimTaskCmd(String taskId, String userId) {
this.taskId = taskId;
this.userId = userId;
}
public Void execute(CommandContext commandContext) {
ensureNotNull("taskId", taskId);
TaskEntity task = commandContext
.getTaskManager()
.findTaskById(taskId);
ensureNotNull("Cannot find task with id " + taskId, "task", task);
if (userId != null) {
if (task.getAssignee() != null) {
if (!task.getAssignee().equals(userId)) {
// When the task is already claimed by another user, throw exception. Otherwise, ignore
// this, post-conditions of method already met.
throw new TaskAlreadyClaimedException(task.getId(), task.getAssignee());
}
} else {
task.setAssignee(userId);
}
} else {
// Task should be assigned to no one
task.setAssignee(null);
}
task.createHistoricTaskDetails(UserOperationLogEntry.OPERATION_TYPE_CLAIM);
return null;
}
}