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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 org.activiti.engine.identity.GroupQuery;
import org.activiti.engine.identity.UserQuery;


/**
 * An identity link is used to associate a task with a certain identity.
 * 
 * For example:
 * - a user can be an assignee (= identity link type) for a task
 * - a group can be a candidate-group (= identity link type) for a task
 * 
 * @author Joram Barrez
 */
public interface IdentityLink {
  
  /**
   * Returns the type of link.
   * See {@link IdentityLinkType} for the native supported types by Activiti. 
   */
  String getType();
  
  /**
   * If the identity link involves a user, then this will be a non-null id of a user.
   * That userId can be used to query for user information through the {@link UserQuery} API.
   */
  String getUserId();
  
  /**
   * If the identity link involves a group, then this will be a non-null id of a group.
   * That groupId can be used to query for user information through the {@link GroupQuery} API.
   */
  String getGroupId();
  
  /**
   * The id of the task associated with this identity link.
   */
  String getTaskId();
  
  /**
   * The process definition id associated with this identity link.
   */
  String getProcessDefinitionId();
  
  /**
   * The process instance id associated with this identity link.
   */
  String getProcessInstanceId();

}