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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.task;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

import org.activiti.engine.TaskService;

/** Exposes twitter-like feeds for tasks and process instances.
 * 
 * @see {@link TaskService#getTaskEvents(String)

 */
public interface Event extends Serializable {

  /**
   * A user identity link was added with following message parts: [0] userId [1] identity link type (aka role)
   */
  String ACTION_ADD_USER_LINK = "AddUserLink";

  /**
   * A user identity link was added with following message parts: [0] userId [1] identity link type (aka role)
   */
  String ACTION_DELETE_USER_LINK = "DeleteUserLink";

  /**
   * A group identity link was added with following message parts: [0] groupId [1] identity link type (aka role)
   */
  String ACTION_ADD_GROUP_LINK = "AddGroupLink";

  /**
   * A group identity link was added with following message parts: [0] groupId [1] identity link type (aka role)
   */
  String ACTION_DELETE_GROUP_LINK = "DeleteGroupLink";

  /**
   * An user comment was added with the short version of the comment as message.
   */
  String ACTION_ADD_COMMENT = "AddComment";

  /** An attachment was added with the attachment name as message. */
  String ACTION_ADD_ATTACHMENT = "AddAttachment";

  /** An attachment was deleted with the attachment name as message. */
  String ACTION_DELETE_ATTACHMENT = "DeleteAttachment";

  /** Unique identifier for this event */
  String getId();

  /**
   * Indicates the type of of action and also indicates the meaning of the parts as exposed in {@link #getMessageParts()}
   */
  String getAction();

  /**
   * The meaning of the message parts is defined by the action as you can find in {@link #getAction()}
   */
  List getMessageParts();

  /**
   * The message that can be used in case this action only has a single message part.
   */
  String getMessage();

  /** reference to the user that made the comment */
  String getUserId();

  /** time and date when the user made the comment */
  Date getTime();

  /** reference to the task on which this comment was made */
  String getTaskId();

  /** reference to the process instance on which this comment was made */
  String getProcessInstanceId();

}




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