OSWorkflow的第四支程式

在workflow執行的過程中，有時需要做一些條件的檢查，例如，公司員工編號都是四碼，如果有個工作流的員工編號只有三碼，就要能檢查出來，下面我們就來做這樣的檢查，各位可以試著用四碼的員工編號請假，確定可以通過檢查後，再用非四碼的員工編號測試，將會出現最後面顯示的exception。

程式
leave.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE workflow PUBLIC "-//OpenSymphony Group//DTD OSWorkflow 2.7//EN"
"http://www.opensymphony.com/osworkflow/workflow_2_7.dtd">
<workflow>
  <initial-actions>
   <action id="0" name="開始">
      <pre-functions>
  <function type="class">
      <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
        <function type="beanshell">
           <arg name="script">
              propertySet.setString("type", transientVars.get("type"));
              propertySet.setString("employee", transientVars.get("caller"));
           </arg>
        </function>
      </pre-functions>
      <results>
        <unconditional-result old-status="Finished" status="Queued"
step="1" owner="${caller}" />
      </results>
      <post-functions>
            <function type="class">
              <arg name="class.name">
              tw.idv.idealist.OutputPropertySet
              </arg>
              <arg name="author">Steven Shi</arg>
            </function>
      </post-functions>
    </action>
  </initial-actions>

  <steps>
    <step id="1" name="填假單">
      <actions>
        <action id="1" name="送出">
          <restrict-to>
            <conditions>
              <condition type="class">
                <arg name="class.name">
                  com.opensymphony.workflow.util.AllowOwnerOnlyCondition
                </arg>
              </condition>
            </conditions>
          </restrict-to>
<validators>
  <validator type="class">
    <arg name="class.name">
      tw.idv.idealist.MyValidator
    </arg>
  </validator>
</validators>
          <pre-functions>
    <function type="class">
      <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
          </pre-functions>
          <results>
            <unconditional-result old-status="Finished" status="Queued"
step="2"  owner="${caller}" />
          </results>
        </action>
      </actions>
    </step>

    <step id="2" name="批假單">
      <actions>
        <action id="2" name="准許">
<pre-functions>
  <function type="class">
    <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
  </function>
</pre-functions>
        <results>
            <unconditional-result old-status="Finished" status="Queued"
step="3"  owner="${caller}"/>
        </results>
        </action>

        <action id="3" name="駁回">
          <pre-functions>
    <function type="class">
      <arg name="class.name">com.opensymphony.workflow.util.Caller</arg>
    </function>
  </pre-functions>
          <results>
            <unconditional-result old-status="Finished" status="Queued"
step="1"  owner="${caller}"/>
          </results>
        </action>
      </actions>     
    </step>

    <step id="3" name="停止" />
  </steps>
</workflow>
MyValidator.java
package tw.idv.idealist;

import java.util.Map;
import com.opensymphony.module.propertyset.PropertySet;
import com.opensymphony.workflow.InvalidInputException;
import com.opensymphony.workflow.Validator;
import com.opensymphony.workflow.WorkflowException;

/**
* @author steven
*/
public class MyValidator implements Validator {

public void validate(Map transientVars, Map args, PropertySet ps)
throws InvalidInputException, WorkflowException {
if (ps.getString("employee").length() != 4) {
throw new InvalidInputException("員工編號錯誤");
}
}

}

Exception
當輸入的員工編號非四碼時，會有如下錯誤…
[InvalidInputException: [Error map: [{}]] [Error list: [[員工編號錯誤]]]
at tw.idv.idealist.MyValidator.validate(MyValidator.java:17)
at com.opensymphony.workflow.AbstractWorkflow.verifyInputs(AbstractWorkflow.java:1025)
at com.opensymphony.workflow.AbstractWorkflow.transitionWorkflow(AbstractWorkflow.java:1248)
at com.opensymphony.workflow.AbstractWorkflow.doAction(AbstractWorkflow.java:551)
at tw.idv.idealist.Leave.send(Leave.java:55)
at tw.idv.idealist.actions.LeaveAction.doPost(LeaveAction.java:26)
at tw.idv.idealist.actions.LeaveAction.doGet(LeaveAction.java:17)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:163)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:199)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)