add -- 添加流程模型和部署管理模块

ruoyi-flowable/src/main/java/com/ruoyi/flowable/utils/ModelUtils.java

@@ -0,0 +1,43 @@
+package com.ruoyi.flowable.utils;
+
+import org.flowable.bpmn.converter.BpmnXMLConverter;
+import org.flowable.bpmn.model.BpmnModel;
+import org.flowable.bpmn.model.FlowElement;
+import org.flowable.bpmn.model.Process;
+import org.flowable.bpmn.model.StartEvent;
+import org.flowable.common.engine.impl.util.io.StringStreamSource;
+
+import java.util.Collection;
+
+/**
+ * @author KonBAI
+ * @createTime 2022/3/26 19:04
+ */
+public class ModelUtils {
+
+    private static final BpmnXMLConverter bpmnXMLConverter = new BpmnXMLConverter();
+
+    /**
+     * xml转bpmnModel对象
+     *
+     * @param xml xml
+     * @return bpmnModel对象
+     */
+    public static BpmnModel getBpmnModel(String xml) {
+        return bpmnXMLConverter.convertToBpmnModel(new StringStreamSource(xml), false, false);
+    }
+
+    /**
+     * 获取开始节点
+     *
+     * @param model bpmnModel对象
+     * @return 开始节点（未找到开始节点，返回null）
+     */
+    public static StartEvent getStartEvent(BpmnModel model) {
+        Process process = model.getMainProcess();
+        Collection<FlowElement> elements = process.getFlowElements();
+        return (StartEvent) elements.stream()
+            .filter(flowElement -> flowElement instanceof StartEvent)
+            .findFirst().orElse(null);
+    }
+}