Golang Type.NumField方法代码示例

func finishNewTable(b *tablebase, ty reflect.Type) Table {
	id := C.newTable()
	t := &table{
		scroller:  newScroller(id, true), // border on Table
		tablebase: b,
		selected:  newEvent(),
	}
	t.fpreferredSize = t.xpreferredSize
	// also sets the delegate
	C.tableMakeDataSource(t.id, unsafe.Pointer(t))
	for i := 0; i < ty.NumField(); i++ {
		colname := ty.Field(i).Tag.Get("uicolumn")
		if colname == "" {
			colname = ty.Field(i).Name
		}
		cname := C.CString(colname)
		coltype := C.colTypeText
		editable := false
		switch {
		case ty.Field(i).Type == reflect.TypeOf((*image.RGBA)(nil)):
			coltype = C.colTypeImage
		case ty.Field(i).Type.Kind() == reflect.Bool:
			coltype = C.colTypeCheckbox
			editable = true
		}
		C.tableAppendColumn(t.id, C.intptr_t(i), cname, C.int(coltype), toBOOL(editable))
		C.free(unsafe.Pointer(cname)) // free now (not deferred) to conserve memory
	}
	return t
}

// isEmptyStruct returns true if given Type is either not a Struct or
// has 0 fields
func isEmptyStruct(t reflect.Type) bool {
	if t.Kind() == reflect.Ptr {
		t = t.Elem()
	}
	// TODO: check for unexported fields?
	return t.Kind() == reflect.Struct && t.NumField() == 0
}

func validateListType(target reflect.Type) error {
	// exceptions
	if listTypeExceptions.Has(target.Name()) {
		return nil
	}
	hasListSuffix := strings.HasSuffix(target.Name(), "List")
	hasMetadata := false
	hasItems := false
	for i := 0; i < target.NumField(); i++ {
		field := target.Field(i)
		tag := field.Tag.Get("json")
		switch {
		case strings.HasPrefix(tag, "metadata"):
			hasMetadata = true
		case tag == "items":
			hasItems = true
			if field.Type.Kind() != reflect.Slice {
				return fmt.Errorf("Expected items to be slice, got %s", field.Type.Kind())
			}
		}
	}
	if hasListSuffix && !hasMetadata {
		return fmt.Errorf("Expected type %s to contain \"metadata\"", target.Name())
	}
	if hasListSuffix && !hasItems {
		return fmt.Errorf("Expected type %s to contain \"items\"", target.Name())
	}
	// if a type contains field Items with JSON tag "items", its name should end with List.
	if !hasListSuffix && hasItems {
		return fmt.Errorf("Type %s has Items, its name is expected to end with \"List\"", target.Name())
	}
	return nil
}

func MakeTypeInfo(rt reflect.Type) *TypeInfo {
	info := &TypeInfo{Type: rt}

	// If struct, register field name options
	if rt.Kind() == reflect.Struct {
		numFields := rt.NumField()
		structFields := []StructFieldInfo{}
		for i := 0; i < numFields; i++ {
			field := rt.Field(i)
			if field.PkgPath != "" {
				continue
			}
			skip, opts := getOptionsFromField(field)
			if skip {
				continue
			}
			structFields = append(structFields, StructFieldInfo{
				Index:   i,
				Type:    field.Type,
				Options: opts,
			})
		}
		info.Fields = structFields
	}

	return info
}

func (c *structCache) Indexes(typ reflect.Type) map[string][]int {
	c.l.RLock()
	indxs, ok := c.m[typ]
	c.l.RUnlock()
	if ok {
		return indxs
	}

	numField := typ.NumField()
	indxs = make(map[string][]int, numField)
	for i := 0; i < numField; i++ {
		f := typ.Field(i)
		if f.PkgPath != "" {
			continue
		}

		tokens := strings.Split(f.Tag.Get("pg"), ",")
		name := tokens[0]
		if name == "-" {
			continue
		}
		if name == "" {
			name = formatColumnName(f.Name)
		}
		indxs[name] = f.Index
	}

	c.l.Lock()
	c.m[typ] = indxs
	c.l.Unlock()

	return indxs
}

func getTableColumns(thing interface{}, typ reflect.Type) []*columnMap {
	columns := make([]*columnMap, 0, typ.NumField())

	for i := 0; i < typ.NumField(); i++ {
		field := typ.Field(i)
		tag := strings.Split(field.Tag.Get("db"), ",")
		if len(tag) > 0 && tag[0] != "" {
			col := &columnMap{Field: i}
			for _, flag := range tag {
				switch flag {
				case "pk":
					col.PrimaryKey = true
				case "serialize":
					col.Serialize = true
				default:
					if col.Name == "" {
						col.Name = flag
					}
				}
			}
			columns = append(columns, col)
		}
	}

	return columns
}

func (db *DB) rawSelectByStruct(structType reflect.Type, qi SqlQueryInfo) (rows *sql.Rows, fields []string, err error) {
	// nums of struct's fields
	lf := structType.NumField()
	// type's fields
	fields = make([]string, 0, lf)
	// sql select columns, it's Snake Cased
	columns := make([]string, 0, lf)

	// get fields in structType,
	// and convert to sql query column name
	for i := 0; i < lf; i++ {
		structField := structType.Field(i)
		fieldName := structField.Name
		fields = append(fields, fieldName)
		columns = append(columns, utils.SnakeCasedName(fieldName))
	}

	// tableName := utils.SnakeCasedName(utils.StructName(s))
	tableName := utils.SnakeCasedName(structType.Name())
	// TODO: check the fileds has specified ?
	qi.Fields = strings.Join(columns, ", ")
	// run query from db
	rows, err = db.Select(tableName, qi)
	return
}

func getFields(typ reflect.Type) *fields {
	numField := typ.NumField()
	fs := newFields(numField)

	for i := 0; i < numField; i++ {
		f := typ.Field(i)
		if f.PkgPath != "" && !f.Anonymous {
			continue
		}

		name, opts := parseTag(f.Tag.Get("msgpack"))
		if name == "-" {
			continue
		}

		if opts.Contains("inline") {
			inlineFields(fs, f)
			continue
		}

		if name == "" {
			name = f.Name
		}
		field := field{
			name:      name,
			index:     f.Index,
			omitEmpty: opts.Contains("omitempty"),
			encoder:   getEncoder(f.Type),
			decoder:   getDecoder(f.Type),
		}
		fs.Add(&field)
	}
	return fs
}

func checkStructs(c *C, t reflect.Type, structsChecked map[string]struct{}) {
	for t.Kind() == reflect.Ptr || t.Kind() == reflect.Map || t.Kind() == reflect.Slice {
		t = t.Elem()
	}

	if t.Kind() != reflect.Struct {
		return
	}
	if _, present := structsChecked[t.String()]; present {
		// Already checked this type
		return
	}

	structsChecked[t.String()] = struct{}{}

	byUpperCase := make(map[string]int)
	for i := 0; i < t.NumField(); i++ {
		sf := t.Field(i)

		// Check that the yaml tag does not contain an _.
		yamlTag := sf.Tag.Get("yaml")
		if strings.Contains(yamlTag, "_") {
			c.Fatalf("yaml field name includes _ character: %s", yamlTag)
		}
		upper := strings.ToUpper(sf.Name)
		if _, present := byUpperCase[upper]; present {
			c.Fatalf("field name collision in configuration object: %s", sf.Name)
		}
		byUpperCase[upper] = i

		checkStructs(c, sf.Type, structsChecked)
	}
}

func (g *schemaGenerator) javaType(t reflect.Type) string {
	if t.Kind() == reflect.Ptr {
		t = t.Elem()
	}
	pkgDesc, ok := g.packages[t.PkgPath()]
	if ok {
		return pkgDesc.JavaPackage + "." + capitalizeFirst(t.Name())
	} else {
		switch t.Kind() {
		case reflect.Bool:
			return "bool"
		case reflect.Int, reflect.Int8, reflect.Int16,
			reflect.Int32, reflect.Uint,
			reflect.Uint8, reflect.Uint16, reflect.Uint32:
			return "int"
		case reflect.Int64, reflect.Uint64:
			return "Long"
		case reflect.Float32, reflect.Float64, reflect.Complex64,
			reflect.Complex128:
			return "double"
		case reflect.String:
			return "String"
		case reflect.Array, reflect.Slice:
			return g.javaTypeArrayList(t.Elem())
		case reflect.Map:
			return "java.util.Map<String," + g.javaTypeWrapPrimitive(t.Elem()) + ">"
		default:
			if len(t.Name()) == 0 && t.NumField() == 0 {
				return "Object"
			}
			return capitalizeClassName(t.Name())
		}
	}
}

func (d decoder) decodeField(sf reflect.StructField, t reflect.Type, v reflect.Value) MessageRejectError {
	if sf.Tag.Get("fix") != "" {
		fixTag, err := strconv.Atoi(sf.Tag.Get("fix"))
		if err != nil {
			panic(err)
		}

		if !d.FieldMap.Has(Tag(fixTag)) {
			return nil
		}

		return d.decodeValue(Tag(fixTag), t, v)
	}

	switch t.Kind() {
	case reflect.Ptr:
		v.Set(reflect.New(t.Elem()))
		return d.decodeField(sf, t.Elem(), v.Elem())
	case reflect.Struct:
		for i := 0; i < t.NumField(); i++ {
			if err := d.decodeField(t.Field(i), t.Field(i).Type, v.Field(i)); err != nil {
				return err
			}
		}
	}

	return nil
}

func New(t interface{}, tags []string, conf Configurator) (*Struct, error) {
	var typ reflect.Type
	if tt, ok := t.(reflect.Type); ok {
		typ = tt
	} else {
		typ = reflect.TypeOf(t)
	}
	for typ.Kind() == reflect.Ptr {
		typ = typ.Elem()
	}
	if typ.Kind() != reflect.Struct {
		return nil, ErrNoStruct
	}
	if typ.NumField() == 0 {
		return nil, ErrNoFields
	}
	s := &Struct{
		Type:     typ,
		MNameMap: make(map[string]int),
		QNameMap: make(map[string]int),
		tags:     tags,
		conf:     conf,
	}
	if err := s.initialize(typ); err != nil {
		return nil, err
	}
	return s, nil
}

func getFieldInfos(rType reflect.Type, parentIndexChain []int) []fieldInfo {
	fieldsCount := rType.NumField()
	fieldsList := make([]fieldInfo, 0, fieldsCount)
	for i := 0; i < fieldsCount; i++ {
		field := rType.Field(i)
		if field.PkgPath != "" {
			continue
		}
		indexChain := append(parentIndexChain, i)
		// if the field is an embedded struct, create a fieldInfo for each of its fields
		if field.Anonymous && field.Type.Kind() == reflect.Struct {
			fieldsList = append(fieldsList, getFieldInfos(field.Type, indexChain)...)
			continue
		}
		fieldInfo := fieldInfo{IndexChain: indexChain}
		fieldTag := field.Tag.Get("csv")
		fieldTags := strings.Split(fieldTag, TagSeparator)
		filteredTags := []string{}
		for _, fieldTagEntry := range fieldTags {
			if fieldTagEntry != "omitempty" {
				filteredTags = append(filteredTags, fieldTagEntry)
			}
		}

		if len(filteredTags) == 1 && filteredTags[0] == "-" {
			continue
		} else if len(filteredTags) > 0 && filteredTags[0] != "" {
			fieldInfo.keys = filteredTags
		} else {
			fieldInfo.keys = []string{field.Name}
		}
		fieldsList = append(fieldsList, fieldInfo)
	}
	return fieldsList
}

func checkJsonTags(objType reflect.Type, seen *map[reflect.Type]bool, t *testing.T) {
	if _, exists := (*seen)[objType]; exists {
		return
	}
	(*seen)[objType] = true
	if !strings.Contains(objType.PkgPath(), "openshift/origin") {
		return
	}
	if internalTypesWithAllowedJsonTags.Has(objType.Name()) {
		return
	}

	for i := 0; i < objType.NumField(); i++ {
		structField := objType.FieldByIndex([]int{i})

		jsonTag := structField.Tag.Get("json")
		if len(jsonTag) != 0 {
			t.Errorf("%v.%v should not have a json tag", objType, structField.Name)
		}

		switch structField.Type.Kind() {
		case reflect.Struct:
			checkJsonTags(structField.Type, seen, t)
		}
	}
}

func checkDescriptions(objType reflect.Type, seen *map[reflect.Type]bool, t *testing.T) {
	if _, exists := (*seen)[objType]; exists {
		return
	}
	(*seen)[objType] = true
	if !strings.Contains(objType.PkgPath(), "openshift/origin") {
		return
	}

	for i := 0; i < objType.NumField(); i++ {
		structField := objType.FieldByIndex([]int{i})

		// these fields don't need descriptions
		if structField.Name == "TypeMeta" || structField.Name == "ObjectMeta" || structField.Name == "ListMeta" {
			continue
		}
		if structField.Type == reflect.TypeOf(unversioned.Time{}) || structField.Type == reflect.TypeOf(time.Time{}) || structField.Type == reflect.TypeOf(runtime.RawExtension{}) {
			continue
		}

		descriptionTag := structField.Tag.Get("description")
		if len(descriptionTag) == 0 {
			t.Errorf("%v", structField.Tag)
			t.Errorf("%v.%v does not have a description", objType, structField.Name)
		}

		switch structField.Type.Kind() {
		case reflect.Struct:
			checkDescriptions(structField.Type, seen, t)
		}
	}
}