新增 bpm 基于流程实例的详情 API 接口

yudao-framework/yudao-spring-boot-starter-activiti/src/main/java/cn/iocoder/yudao/framework/activiti/core/util/ActivitiUtils.java

@@ -1,6 +1,7 @@
 package cn.iocoder.yudao.framework.activiti.core.util;
 
 import cn.hutool.core.util.ReflectUtil;
+import cn.hutool.core.util.StrUtil;
 import com.alibaba.ttl.TransmittableThreadLocal;
 import org.activiti.bpmn.converter.BpmnXMLConverter;
 import org.activiti.bpmn.model.BpmnModel;
@@ -46,7 +47,6 @@ public class ActivitiUtils {
 
     // ========== BPMN XML 相关 ==========
 
-
     /**
      * 构建对应的 BPMN Model
      *
@@ -59,6 +59,13 @@ public class ActivitiUtils {
         return converter.convertToBpmnModel(new BytesStreamSource(bpmnBytes), true, true);
     }
 
+    /**
+     * 获得 BPMN 流程中，指定的元素们
+     *
+     * @param model
+     * @param clazz 指定元素。例如说，{@link org.activiti.bpmn.model.UserTask}、{@link org.activiti.bpmn.model.Gateway} 等等
+     * @return 元素们
+     */
     public static <T extends FlowElement> List<T> getBpmnModelElements(BpmnModel model, Class<T> clazz) {
         List<T> result = new ArrayList<>();
         model.getProcesses().forEach(process -> {
@@ -71,4 +78,12 @@ public class ActivitiUtils {
         return result;
     }
 
+    public static String getBpmnXml(BpmnModel model) {
+        if (model == null) {
+            return null;
+        }
+        BpmnXMLConverter converter = new BpmnXMLConverter();
+        return StrUtil.utf8Str(converter.convertToXML(model));
+    }
+
 }