给任务实例添加附加名称

前段时间用jbpm做工作流,同事要求能根据实际的流程显示任务详细信息,自己就做了一个actionHandler,放入在task的task-assign事件中.

java 代码

package com.guotai.wf.handler;

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

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.jbpm.context.exe.ContextInstance;
import org.jbpm.graph.def.ActionHandler;
import org.jbpm.graph.exe.ExecutionContext;
import org.jbpm.graph.exe.Token;
import org.jbpm.taskmgmt.exe.TaskInstance;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

/**
 * 给任务实例添加名称
 * @author sp
 * @since 2006-11-13
 *
 */
public class TaskNameSetterHandler implements ActionHandler {
    /**
     * Logger for this class
     */
    private static final Logger logger = Logger.getLogger(TaskNameSetterHandler.class);

    private String message;

    public void execute(ExecutionContext executionContext) throws Exception {
        String[] arr = pickupMessage();

        String msg = message;
        if(arr != null){
            for(int i=0;i<arr.length;i++){
                Object o = getValue(executionContext.getContextInstance(), executionContext.getToken(), arr[i]);
                msg = replaceMessage(msg,arr[i], o);
            }
        }

        TaskInstance ti = executionContext.getTaskInstance();
        ti.setName(ti.getName() + ":" + msg);

    }


    /**
     * 替换message
     * @param name
     * @param o
     */
    public String replaceMessage(String msg,String name,Object o){
        String name_find = "${" + name + "}";
        if(msg.indexOf("${" + name + "}") > -1){
            logger.debug("有其值!");
        }
        String str = msg.substring(0,msg.indexOf(name_find));
        if(o != null){
            str += o.toString();
        }else{
            str += " ";
        }
        str += msg.substring(msg.indexOf(name_find)+name_find.length(),msg.length());
        msg = str;
        return msg;
    }
    /**
     * 从ContextInstance中根据name得到其值
     * 如果name中间有".",说明是一个对象,取其对象的某个属性
     * @param contextInstance
     * @param token
     * @param name
     * @return
     */
    private Object getValue(ContextInstance contextInstance,Token token,String name){
        Object value = null;
        if (name.indexOf(".") > -1) {
            String prename = name.substring(0, name.indexOf("."));
            String postname = name.substring(name.indexOf(".") + 1,name.length());
            Object o = contextInstance.getVariable(prename, token);
            try {
                value = o;
                BeanWrapper bw = new BeanWrapperImpl(o);
                String name_tmp = postname;
                value = bw.getPropertyValue(postname);
            } catch (Exception e) {
                logger.error(e);
                throw new IllegalArgumentException("convert error");
            }
        } else {
            value = contextInstance.getVariable(name, token);
        }
        return value;
    }

    /**
     * 从消息中提取${}包含的值
     * @return
     */
    public String[] pickupMessage(){
        if((this.message != null) && (this.message.indexOf("${") > -1)){
            List list = new ArrayList();
            String str = message;
            while(str.indexOf("${") > -1){
                String str_sub = StringUtils.substringBetween(str, "${", "}");
                logger.debug("提取字符串:" + str_sub);
                list.add(str_sub);
                str = StringUtils.substring(str,str.indexOf("${")+2);
            }
            String[] arr = new String[list.size()];
            int i=0;
            for(Iterator it=list.iterator();it.hasNext();){
                arr[i++] = (String) it.next();
            }
            return arr;
        }
        return null;
    }

    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }

}

 

我用的springModule集成jbpm的,所在在参数在spring配置文件中设置,如下

xml 代码

<bean name="taskNameSetterAction" class="com.guotai.wf.handler.TaskNameSetterHandler">
     <property name="message" value="名称为${sale.item}数目为${sale.quantity}"/>
</bean>