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102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
package util
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import (
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"errors"
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"reflect"
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)
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// 构造器
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type Builder struct { // 用于存储属性字段
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fileId []reflect.StructField
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}
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func NewBuilder() *Builder {
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return &Builder{}
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}
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// 添加字段
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func (b *Builder) AddField(field string, typ reflect.Type) *Builder {
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b.fileId = append(b.fileId, reflect.StructField{Name: field, Type: typ})
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return b
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}
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// 根据预先添加的字段构建出结构体
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func (b *Builder) Build() *Struct {
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stu := reflect.StructOf(b.fileId)
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index := make(map[string]int)
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for i := 0; i < stu.NumField(); i++ {
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index[stu.Field(i).Name] = i
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}
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return &Struct{stu, index}
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}
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func (b *Builder) AddString(name string) *Builder {
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return b.AddField(name, reflect.TypeOf(""))
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}
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func (b *Builder) AddBool(name string) *Builder {
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return b.AddField(name, reflect.TypeOf(true))
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}
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func (b *Builder) AddInt64(name string) *Builder {
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return b.AddField(name, reflect.TypeOf(int64(0)))
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}
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func (b *Builder) AddFloat64(name string) *Builder {
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return b.AddField(name, reflect.TypeOf(float64(1.2)))
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}
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// 实际生成的结构体，基类
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// 结构体的类型
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type Struct struct {
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typ reflect.Type
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// <fieldName : 索引>
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// 用于通过字段名称，从Builder的[]reflect.StructField中获取reflect.StructField
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index map[string]int
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}
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func (s Struct) New() *Instance {
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return &Instance{reflect.New(s.typ).Elem(), s.index}
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}
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// 结构体的值
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type Instance struct {
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instance reflect.Value
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// <fieldName : 索引>
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index map[string]int
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}
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var (
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FieldNoExist error = errors.New("field no exist")
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)
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func (in Instance) Field(name string) (reflect.Value, error) {
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if i, ok := in.index[name]; ok {
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return in.instance.Field(i), nil
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} else {
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return reflect.Value{}, FieldNoExist
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}
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}
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func (in *Instance) SetString(name, value string) {
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if i, ok := in.index[name]; ok {
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in.instance.Field(i).SetString(value)
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}
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}
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func (in *Instance) SetBool(name string, value bool) {
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if i, ok := in.index[name]; ok {
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in.instance.Field(i).SetBool(value)
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}
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}
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func (in *Instance) SetInt64(name string, value int64) {
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if i, ok := in.index[name]; ok {
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in.instance.Field(i).SetInt(value)
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}
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}
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func (in *Instance) SetFloat64(name string, value float64) {
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if i, ok := in.index[name]; ok {
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in.instance.Field(i).SetFloat(value)
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}
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}
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func (i *Instance) Interface() interface{} {
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return i.instance.Interface()
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}
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func (i *Instance) Addr() interface{} {
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return i.instance.Addr().Interface()
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}
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