Refactor current GAE abstraction library to be free of the SDK*

go/src/infra/gae/libs/gae/prod/raw_datastore_type_converter.go

Index: go/src/infra/gae/libs/gae/prod/raw_datastore_type_converter.go
diff --git a/go/src/infra/gae/libs/gae/prod/raw_datastore_type_converter.go b/go/src/infra/gae/libs/gae/prod/raw_datastore_type_converter.go
new file mode 100644
index 0000000000000000000000000000000000000000..87fdce1400d00c1ff89281bc37ba9ca59c47f192
--- /dev/null
+++ b/go/src/infra/gae/libs/gae/prod/raw_datastore_type_converter.go
@@ -0,0 +1,85 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package prod
+
+import (
+	"errors"
+
+	"infra/gae/libs/gae"
+
+	"google.golang.org/appengine"
+	"google.golang.org/appengine/datastore"
+)
+
+type typeFilter struct {
+	dps gae.DSPropertyLoadSaver
+}
+
+var _ datastore.PropertyLoadSaver = &typeFilter{}
+
+func (tf *typeFilter) Load(props []datastore.Property) (err error) {
+	newProps := map[string][]gae.DSProperty{}
+	for _, p := range props {
+		val := p.Value
+		switch x := val.(type) {
+		case datastore.ByteString:
+			val = gae.DSByteString(x)
+		case *datastore.Key:
+			val = dsR2F(x)
+		case appengine.BlobKey:
+			val = gae.BSKey(x)
+		case appengine.GeoPoint:
+			val = gae.DSGeoPoint(x)
+		}
+		prop := gae.DSProperty{}
+		if err = prop.SetValue(val, p.NoIndex); err != nil {
+			return err
+		}
+		newProps[p.Name] = append(newProps[p.Name], prop)
+	}
+	convFailures, err := tf.dps.Load(newProps)
+	if err == nil && len(convFailures) > 0 {
+		me := make(gae.MultiError, len(convFailures))
+		for i, f := range convFailures {
+			me[i] = errors.New(f)
+		}
+		err = me
+	}
+	return
+}
+
+func (tf *typeFilter) Save() ([]datastore.Property, error) {
+	newProps, err := tf.dps.Save()
+	if err != nil {
+		return nil, err
+	}
+
+	props := []datastore.Property{}
+	for name, propList := range newProps {
+		multiple := len(propList) > 1
+		for _, prop := range propList {
+			toAdd := datastore.Property{
+				Name:     name,
+				Multiple: multiple,
+				NoIndex:  prop.NoIndex(),
+			}
+			switch x := prop.Value().(type) {
+			case gae.DSByteString:
+				toAdd.Value = datastore.ByteString(x)
+			case gae.DSKey:
+				toAdd.Value = dsF2R(x)
+			case gae.BSKey:
+				toAdd.Value = appengine.BlobKey(x)
+			case gae.DSGeoPoint:
+				toAdd.Value = appengine.GeoPoint(x)
+			default:
+				toAdd.Value = x
+			}
+			props = append(props, toAdd)
+		}
+	}
+
+	return props, nil
+}