github.com/jhump/protoreflect@v1.16.0/desc/descriptor_no_unsafe.go (about)

     1  //go:build appengine || gopherjs || purego
     2  // +build appengine gopherjs purego
     3  
     4  // NB: other environments where unsafe is unappropriate should use "purego" build tag
     5  // https://github.com/golang/go/issues/23172
     6  
     7  package desc
     8  
     9  type jsonNameMap struct{}
    10  type memoizedDefault struct{}
    11  
    12  // FindFieldByJSONName finds the field with the given JSON field name. If no such
    13  // field exists then nil is returned. Only regular fields are returned, not
    14  // extensions.
    15  func (md *MessageDescriptor) FindFieldByJSONName(jsonName string) *FieldDescriptor {
    16  	// NB: With allowed use of unsafe, we use it to atomically define an index
    17  	// via atomic.LoadPointer/atomic.StorePointer. Without it, we skip the index
    18  	// and must do a linear scan of fields each time.
    19  	for _, f := range md.fields {
    20  		jn := f.GetJSONName()
    21  		if jn == jsonName {
    22  			return f
    23  		}
    24  	}
    25  	return nil
    26  }
    27  
    28  func (fd *FieldDescriptor) getDefaultValue() interface{} {
    29  	return fd.determineDefault()
    30  }