GetRollbackNodeCmd.java example

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FoxBPM-master
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/**
 * Copyright 1996-2014 FoxBPM ORG.
 *
 * 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.
 * 
 * @author kenshin
 * @author ych
 */
package org.foxbpm.engine.impl.cmd;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.foxbpm.engine.impl.entity.ProcessDefinitionEntity;
import org.foxbpm.engine.impl.entity.TaskEntity;
import org.foxbpm.engine.impl.entity.TokenEntity;
import org.foxbpm.engine.impl.interceptor.Command;
import org.foxbpm.engine.impl.interceptor.CommandContext;
import org.foxbpm.engine.impl.util.ExceptionUtil;
import org.foxbpm.engine.impl.util.StringUtil;
import org.foxbpm.kernel.process.KernelFlowNode;
import org.foxbpm.kernel.runtime.impl.KernelTokenImpl;

/**
 * 获取可退回的节点（不重复）
 * @author ych
 *
 */
public class GetRollbackNodeCmd implements Command<List<KernelFlowNode>> {

	private String taskId;
	public GetRollbackNodeCmd(String taskId) {
		this.taskId = taskId;
	}
	
	 
	public List<KernelFlowNode> execute(CommandContext commandContext) {
		if(StringUtil.isEmpty(taskId)){
			throw ExceptionUtil.getException("10601201");
		}
		
		List<KernelFlowNode> results = new ArrayList<KernelFlowNode>();
		Map<String,String> flowNodeIds = new HashMap<String,String>();
		TaskEntity taskEntity = commandContext.getTaskManager().findTaskById(taskId);
		
		TokenEntity token = taskEntity.getToken();
		/** 获取当前令牌所有父亲令牌 */
		List<KernelTokenImpl> allParent = token.getAllParent();
		List<String> tokenIds = new ArrayList<String>();
		/** 创建出父令牌ID集合 */
		for (KernelTokenImpl tokenParent : allParent) {
			tokenIds.add(tokenParent.getId());
		}
		/** 将自己本身也添加进去 */
		tokenIds.add(token.getId());

		/** 查询相关联的完成的任务 */
		List<TaskEntity> tasks = commandContext.getTaskManager().findEndTasksByTokenIds(tokenIds);
		if(tasks != null && tasks.size() >0){
			for(TaskEntity task : tasks){
				if(!flowNodeIds.containsKey(task.getNodeId())){
					//这里用hashMap性能较高
					flowNodeIds.put(task.getNodeId(), task.getNodeId());
				}
			}
		}
		
		if(flowNodeIds.size() == 0){
			return results;
		}
		
		ProcessDefinitionEntity processDefinitionEntity = taskEntity.getProcessDefinition();
		Iterator<String> it = flowNodeIds.keySet().iterator();
		while(it.hasNext()){
			String nodeId = it.next();
			KernelFlowNode tmpNode = processDefinitionEntity.findFlowNode(nodeId);
			results.add(tmpNode);
		}
		return results;
	}
}