上次讲述了任务节点的扩展属性，这次讲解一下流程的扩展属性

前端

1 stencilset_bpmn.json 中增加属性

{

"name" : "process_devicetypepackage",

"properties" : [ {

"id" : "processdevicetype",

"type" : "String",

"title" : "流程显示端",

"value" : "",

"description" : "Which group, can start the process?",

"popular" : true

} ]

}

2 把此新增属性添加到 BPMNDiagram 属性中

"propertyPackages" : [ "process_idpackage", "namepackage", "documentationpackage", "process_authorpackage", "process_versionpackage", "process_namespacepackage", "process_historylevelpackage", "isexecutablepackage", "datapropertiespackage", "executionlistenerspackage", "eventlistenerspackage", "signaldefinitionspackage", "messagedefinitionspackage", "process_potentialstarteruserpackage","process_potentialstartergrouppackage", "process_iseagerexecutionfetchpackage", "process_devicetypepackage" ]

此时，前端展示为：

流程定义扩展属性.png

后端

1 BaseBpmnJsonConverter 中 convertToJson 中增加代码为：

在 此方法中这个判断里面

if (baseElement instanceof FlowElement) {

FlowElement flowElement = (FlowElement) baseElement;

if (StringUtils.isNotEmpty(flowElement.getName())) {

propertiesNode.put(PROPERTY_NAME, flowElement.getName());

}

if (StringUtils.isNotEmpty(flowElement.getDocumentation())) {

propertiesNode.put(PROPERTY_DOCUMENTATION, flowElement.getDocumentation());

}

Map> extensionElements = flowElement.getExtensionElements();

List elements = extensionElements.get(PROCESS_DEVICE_TYPE_NODE_KEY);

if (CollectionUtils.isNotEmpty(elements)){

for (ExtensionElement extensionElement:elements){

if (extensionElement.getName().equals(PROCESS_DEVICE_TYPE_NODE_KEY)){

propertiesNode.put(PROCESS_DEVICE_TYPE_NODE,extensionElement.getElementText());

}

}

}

}

2 BpmnJsonConverter 中 convertToJson 方法

if (mainProcess.getExtensionElements().containsKey(PROCESS_DEVICE_TYPE)) {

List elements = mainProcess.getExtensionElements().get(PROCESS_DEVICE_TYPE);

if (elements != null && elements.size() > 0) {

String processDeviceType = elements.get(0).getElementText();

if (StringUtils.isNotEmpty(processDeviceType)) {

propertiesNode.put(PROCESS_DEVICE_TYPE_NODE, processDeviceType);

}

}

}

3 BpmnJsonConverter 中 convertToBpmnModel 方法 在判断中增加

if (!nonEmptyPoolFound) {}

String processDeviceType = BpmnJsonConverterUtil.getPropertyValueAsString(PROCESS_DEVICE_TYPE, modelNode);

if (StringUtils.isNotEmpty(processDeviceType)) {

ExtensionElement extensionElement = new ExtensionElement();

extensionElement.setName(PROCESS_DEVICE_TYPE);

extensionElement.setNamespace("http://flowable.org/bpmn");

extensionElement.setNamespacePrefix("flowable");

extensionElement.setElementText(processDeviceType);

process.addExtensionElement(extensionElement);

}

此时，流程定义的扩展属性增加完成。