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parser.go
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400 lines (318 loc) · 9.31 KB
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package smart
import (
"errors"
"fmt"
"github.com/clbanning/mxj"
"reflect"
)
// xml 节点信息
const (
RootElement = "process"
// map中节点类型
ElementType = "elementType"
// 变迁节点名称
NodeTransition = "transition"
// 节点属性名称
AttrName = "-name"
AttrDisplayName = "-displayName"
AttrInstanceUrl = "-instanceUrl"
AttrInstanceNoClazz = "-instanceNoClass"
AttrExpr = "-expr"
AttrHandleClazz = "-handleClass"
AttrForm = "-form"
AttrField = "-field"
AttrValue = "-value"
AttrAttr = "-attr"
attrType= "-type"
AttrAssignee = "-assignee"
AttrAssignmentHandler = "-assignmentHandler"
AttrPerormType = "-performType"
AttrTaskType = "-taskType"
AttrTo = "-to"
AttrProcessName = "-processName"
AttrVersion = "-version"
AttrExpireTime = "-expireTime"
AttrAutoExecute = "-autoExecute"
AttrCallback = "-callback"
AttrReminderTime = "-reminderTime"
AttrReminderRepeat = "-reminderRepeat"
AttrClazz = "-clazz"
AttrMethodName = "-methodName"
AttrArgs = "-args"
AttrVar = "-var"
AttrLayout = "-layout"
AttrG = "-g"
AttrOffset = "-offset"
AttrPreInterceptors = "-preInterceptors"
AttrPostInterceptors = "-postInterceptors"
)
//
type SmartrParserContainer interface {
// 添加解析
AddParserFactory(elementName string, f NodeParserFactory)
// 根据element名称获取对应的工厂
GetNodeParserFactory(elementName string) NodeParserFactory
}
// engine上挂载factory
type NodeParserFactory interface {
// 根据elementName查找使用哪个parser
NewParse() NodeParser
}
// 节点解析接口
type NodeParser interface {
// 节点dom元素解析方法，由实现类完成解析
Parse(element map[string]interface{}) (INodeModel, error)
}
type ModelGen interface {
newModel() INodeModel
}
type DefaultSnakerParserContainer struct {
container map[string]NodeParserFactory
}
func (d *DefaultSnakerParserContainer) AddParserFactory(elementName string, f NodeParserFactory) {
d.container[elementName] = f
}
func (d *DefaultSnakerParserContainer) GetNodeParserFactory(elementName string) NodeParserFactory {
if f, ok := d.container[elementName]; ok {
return f
} else {
panic(fmt.Sprintf("[%s]没有对应的解析工厂类", elementName))
}
}
func NewDefaultSmartParserContainer() *DefaultSnakerParserContainer {
container := make(map[string]NodeParserFactory)
// 注册解析工厂
container["start"] = &StartParserFactory{}
container["end"] = &EndParserFactory{}
container["task"] = &TaskParserFactory{}
container["decision"] = &DecisionParserFactory{}
container["custom"] = &CustomParserFactory{}
return &DefaultSnakerParserContainer{
container,
}
}
type AbstractNodeParser struct {
//model *model.NodeModel
Parent ModelGen
}
func (a *AbstractNodeParser) Parse(element map[string]interface{}) (INodeModel, error) {
m := a.Parent.newModel()
m.SetName(element[AttrName].(string))
m.SetDisplayName(element[AttrDisplayName].(string))
// interceptor
v := element[NodeTransition]
var tms []map[string]interface{}
if v != nil {
vv := reflect.ValueOf(v)
switch vv.Kind() {
case reflect.Map:
tms = append(tms, v.(map[string]interface{}))
case reflect.Slice:
for _, k := range v.([]interface{}) {
tms = append(tms, k.(map[string]interface{}))
}
}
}
for _, tte := range tms {
if _, ok := tte[AttrExpr]; !ok {
tte[AttrExpr] = ""
}
if _, ok := tte[AttrDisplayName]; !ok {
tte[AttrDisplayName] = ""
}
transition := &TransitionModel{
BaseModel: BaseModel{
Name: tte[AttrName].(string),
DisplayName: tte[AttrDisplayName].(string),
},
To: tte[AttrTo].(string),
Expr: tte[AttrExpr].(string),
Source: m,
}
m.SetOutputs(append(m.GetOutputs(), transition))
//m.Outputs = append(m.Outputs, transition)
}
//a.parseNode(m, element)
if p, ok := a.Parent.(ParseNode); ok {
if err := p.parseNode(m, element); err != nil {
return nil, err
}
}
return m, nil
}
type ParseNode interface {
parseNode(model INodeModel, element map[string]interface{}) error
}
// 子类可覆盖此方法，完成特定的解析
//func (a *AbstractNodeParser) parseNode(model *NodeModel, element map[string]interface{}) error {
// if p, ok := a.Parent.(ParseNode); ok {
// return p.parseNode(model, element)
// }
// return nil
//}
func (a *AbstractNodeParser) newModel() interface{} {
panic("未实现此方法")
}
///////////////////////////////////////////////////////////////////////////////////////////////////////
type StartParser struct {
AbstractNodeParser
}
type StartParserFactory struct {
}
func (s *StartParserFactory) NewParse() NodeParser {
ss := new(StartParser)
ss.Parent = ss
return ss
}
func (s *StartParser) newModel() INodeModel {
newNode := NewNodeModel("", "")
startModel := &StartModel{ NodeModel: *newNode }
startModel.SetExec(startModel.exec)
return startModel
}
///////////////////////////////////////////////////////////////////////////////////////////////////////
type EndParser struct {
AbstractNodeParser
}
type EndParserFactory struct {
}
func (e *EndParserFactory) NewParse() NodeParser {
end := new(EndParser)
end.Parent = end
return end
}
func (e *EndParser) newModel() INodeModel {
newNode := NewNodeModel("", "")
endModel := &EndModel{ NodeModel: *newNode }
endModel.SetExec(endModel.exec)
return endModel
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
type CustomParser struct {
AbstractNodeParser
}
type CustomParserFactory struct {
}
func (c *CustomParserFactory) NewParse() NodeParser {
custom := new(CustomParser)
custom.Parent = custom
return custom
}
func (c *CustomParser) newModel() INodeModel {
newNode := NewNodeModel("", "")
workModel := WorkModel{ *newNode, "" }
customModel := &CustomModel{ workModel, "" }
customModel.SetExec(customModel.exec)
return customModel
}
func (a *CustomParser) parseNode(model INodeModel, element map[string]interface{}) error {
customModel := model.(*CustomModel)
if element[AttrClazz] == nil {
return errors.New("自定义模型需要指定clazz")
}
customModel.Clazz = element[AttrClazz].(string)
return nil
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
type DecisionParser struct {
AbstractNodeParser
}
type DecisionParserFactory struct {
}
func (df *DecisionParserFactory) NewParse() NodeParser {
d := new(DecisionParser)
d.Parent = d
return d
}
func (df *DecisionParser) newModel() INodeModel {
newNode := NewNodeModel("", "")
decisionModel := &DecisionModel{ NodeModel: *newNode }
decisionModel.SetExec(decisionModel.exec)
return decisionModel
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
type TaskParser struct {
AbstractNodeParser
}
type TaskParserFactory struct {
}
func (tf *TaskParserFactory) NewParse() NodeParser {
t := new(TaskParser)
t.Parent = t
return t
}
func (tp *TaskParser) newModel() INodeModel {
newNode := NewNodeModel("", "")
workModel := WorkModel{ *newNode, "" }
taskModel := &TaskModel{ WorkModel: workModel }
taskModel.SetExec(taskModel.exec)
return taskModel
}
func (tp *TaskParser) parseNode(model INodeModel, element map[string]interface{}) error {
task := model.(*TaskModel)
task.AssignTo = element[AttrAssignee].(string)
return nil
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
type Parser interface {
ParseXml(content string) (*ProcessModel, error)
}
type XmlParser struct {
// xml 元素解析容器
ElementParserContainer SmartrParserContainer
}
// 解析流程定义文件，并将解析后的对象放入模型容器中
func (x *XmlParser) ParseXml(content string) (*ProcessModel, error) {
if c, err := mxj.NewMapXml([]byte(content)); err != nil {
return nil, errors.New(fmt.Sprintf("解析xml文件出错, content: %s", content))
} else {
// 根元素
root := c.Old()[RootElement].(map[string]interface{})
process := NewProcess(root[AttrName].(string), root[AttrDisplayName].(string))
for k, v := range root {
vv := reflect.ValueOf(v)
switch vv.Kind() {
case reflect.Map:
vvv := v.(map[string]interface{})
vvv[ElementType] = k
if m, err := x.parseModel(vvv); err != nil {
return nil, err
} else {
process.Nodes = append(process.Nodes, m)
}
case reflect.Slice:
// 节点类型多个时
// 是slice类型
for _, kk := range v.([]interface{}) {
vvv := kk.(map[string]interface{})
vvv[ElementType] = k
if m, err := x.parseModel(vvv); err != nil {
return nil, err
} else {
process.Nodes = append(process.Nodes, m)
}
}
}
}
for _, node := range process.Nodes {
for _, transition := range node.GetOutputs() {
to := transition.To
for _, node2 := range process.Nodes {
if to == node2.GetName() {
transition.Target = node2
node2.SetInputs(append(node2.GetInputs(), transition))
}
}
if transition.Target == nil {
panic("transition target is nil. ---> " + transition.Name + " ---> targetName: " + transition.To)
}
}
}
return process, nil
}
return nil, fmt.Errorf("解析xml失败")
}
// 对流程定义xml的节点，根据其节点对应的解析器解析节点内容
func (x *XmlParser) parseModel(node map[string]interface{}) (INodeModel, error) {
return x.ElementParserContainer.GetNodeParserFactory(node[ElementType].(string)).NewParse().Parse(node)
}