/
relationGettersGenerator.go
226 lines (196 loc) · 5.51 KB
/
relationGettersGenerator.go
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package cmd
import (
"go/types"
"github.com/dave/jennifer/jen"
"github.com/ettle/strcase"
"github.com/FrancoLiberali/cql/cql-gen/cmd/log"
)
const (
// cql/preload
preloadPath = cqlPath + "/preload"
cqlVerifyStructLoaded = "VerifyStructLoaded"
cqlVerifyPointerLoaded = "VerifyPointerLoaded"
cqlVerifyPointerWithIDLoaded = "VerifyPointerWithIDLoaded"
cqlVerifyCollectionLoaded = "VerifyCollectionLoaded"
)
type RelationGettersGenerator struct {
object types.Object
objectType Type
}
func NewRelationGettersGenerator(object types.Object) *RelationGettersGenerator {
return &RelationGettersGenerator{
object: object,
objectType: Type{Type: object.Type()},
}
}
// Add conditions for an object in the file
func (generator RelationGettersGenerator) Into(file *File) error {
fields, err := getFields(generator.objectType)
if err != nil {
return err
}
log.Logger.Infof("Generating relation getters for type %q in %s", generator.object.Name(), file.name)
file.Add(generator.ForEachField(file, fields)...)
return nil
}
func (generator RelationGettersGenerator) ForEachField(file *File, fields []Field) []jen.Code {
relationGetters := []jen.Code{}
for _, field := range fields {
if field.Embedded {
relationGetters = append(
relationGetters,
generateForEmbeddedField[jen.Code](
file,
field,
generator,
)...,
)
} else {
getterForField := generator.generateForField(field)
if getterForField != nil {
relationGetters = append(relationGetters, getterForField)
}
}
}
return relationGetters
}
func (generator RelationGettersGenerator) generateForField(field Field) jen.Code {
switch fieldType := field.GetType().(type) {
case *types.Named:
// the field is a named type (user defined structs)
_, err := field.Type.CQLModelStruct()
if err == nil {
log.Logger.Debugf("Generating relation getter for type %q and field %s", generator.object.Name(), field.Name)
// field is a cql Model
return generator.verifyStruct(field)
}
case *types.Pointer:
// the field is a pointer
return generator.generateForPointer(field.ChangeType(fieldType.Elem(), true))
default:
log.Logger.Debugf("struct field type not handled: %T", fieldType)
}
return nil
}
func (generator RelationGettersGenerator) generateForPointer(field Field) jen.Code {
switch fieldType := field.GetType().(type) {
case *types.Named:
_, err := field.Type.CQLModelStruct()
if err == nil {
// field is a pointer to cql Model
fk, err := generator.objectType.GetFK(field)
if err != nil {
log.Logger.Debugf("unhandled: field is a pointer and object not has the fk: %s", field.Type)
return nil
}
log.Logger.Debugf("Generating relation getter for type %q and field %s", generator.object.Name(), field.Name)
switch fk.GetType().(type) {
case *types.Named:
if fk.IsModelID() {
return generator.verifyPointerWithID(field)
}
case *types.Pointer:
// the fk is a pointer
return generator.verifyPointer(field)
}
}
case *types.Slice:
return generator.generateForSlicePointer(
field.ChangeType(fieldType.Elem(), false),
nil,
)
}
return nil
}
func (generator RelationGettersGenerator) generateForSlicePointer(field Field, fieldTypePrefix *jen.Statement) jen.Code {
switch fieldType := field.GetType().(type) {
case *types.Named:
_, err := field.Type.CQLModelStruct()
if err == nil {
// field is a pointer to a slice of cql Model
return generator.verifyCollection(field, fieldTypePrefix)
}
case *types.Pointer:
return generator.generateForSlicePointer(
field.ChangeType(fieldType.Elem(), false),
jen.Op("*"),
)
}
return nil
}
func getGetterName(field Field) string {
return "Get" + strcase.ToPascal(field.Name)
}
func (generator RelationGettersGenerator) verifyStruct(field Field) *jen.Statement {
return generator.verifyCommon(
field,
cqlVerifyStructLoaded,
jen.Op("*"),
nil,
jen.Op("&").Id("m").Op(".").Id(field.Name),
)
}
func (generator RelationGettersGenerator) verifyPointer(field Field) *jen.Statement {
return generator.verifyPointerCommon(field, cqlVerifyPointerLoaded)
}
func (generator RelationGettersGenerator) verifyPointerWithID(field Field) *jen.Statement {
return generator.verifyPointerCommon(field, cqlVerifyPointerWithIDLoaded)
}
func (generator RelationGettersGenerator) verifyCollection(field Field, fieldTypePrefix *jen.Statement) jen.Code {
return generator.verifyCommon(
field,
cqlVerifyCollectionLoaded,
jen.Index(),
fieldTypePrefix,
jen.Id("m").Op(".").Id(field.Name),
)
}
func (generator RelationGettersGenerator) verifyPointerCommon(field Field, verifyFunc string) *jen.Statement {
return generator.verifyCommon(
field,
verifyFunc,
jen.Op("*"),
nil,
jen.Id("m").Op(".").Id(field.Name+"ID"),
jen.Id("m").Op(".").Id(field.Name),
)
}
func (generator RelationGettersGenerator) verifyCommon(
field Field,
verifyFunc string,
returnType *jen.Statement,
fieldTypePrefix *jen.Statement,
callParams ...jen.Code,
) *jen.Statement {
fieldType := jen.Qual(
getRelativePackagePath(
generator.object.Pkg().Name(),
field.Type,
),
field.TypeName(),
)
if fieldTypePrefix != nil {
fieldType = fieldTypePrefix.Add(fieldType)
}
return jen.Func().Parens(
jen.Id("m").Id(generator.object.Name()),
).Id(getGetterName(field)).Params().Add(
jen.Parens(
jen.List(
returnType.Add(fieldType),
jen.Id("error"),
),
),
).Block(
jen.Return(
jen.Qual(
preloadPath,
verifyFunc,
).Types(
fieldType,
).Call(
callParams...,
),
),
)
}