// WriteProperty writes a Property to the buffer. `context` behaves the same
// way that it does for WriteKey, but only has an effect if `p` contains a
// Key as its Value.
func WriteProperty(buf Buffer, context KeyContext, p ds.Property) (err error) {
defer recoverTo(&err)
typb := byte(p.Type())
if p.IndexSetting() != ds.NoIndex {
typb |= 0x80
}
panicIf(buf.WriteByte(typb))
switch p.Type() {
case ds.PTNull:
case ds.PTBool:
b := p.Value().(bool)
if b {
err = buf.WriteByte(1)
} else {
err = buf.WriteByte(0)
}
case ds.PTInt:
_, err = cmpbin.WriteInt(buf, p.Value().(int64))
case ds.PTFloat:
_, err = cmpbin.WriteFloat64(buf, p.Value().(float64))
case ds.PTString:
_, err = cmpbin.WriteString(buf, p.Value().(string))
case ds.PTBytes:
_, err = cmpbin.WriteBytes(buf, p.Value().([]byte))
case ds.PTTime:
err = WriteTime(buf, p.Value().(time.Time))
case ds.PTGeoPoint:
err = WriteGeoPoint(buf, p.Value().(ds.GeoPoint))
case ds.PTKey:
err = WriteKey(buf, context, p.Value().(ds.Key))
case ds.PTBlobKey:
_, err = cmpbin.WriteString(buf, string(p.Value().(blobstore.Key)))
}
return
}
// writePropertyImpl is an implementation of WriteProperty and
// WriteIndexProperty.
func writePropertyImpl(buf Buffer, context KeyContext, p *ds.Property, index bool) (err error) {
defer recoverTo(&err)
it, v := p.IndexTypeAndValue()
if !index {
it = p.Type()
}
typb := byte(it)
if p.IndexSetting() != ds.NoIndex {
typb |= 0x80
}
panicIf(buf.WriteByte(typb))
err = writeIndexValue(buf, context, v)
return
}
func dsF2RProp(ctx context.Context, in ds.Property) (datastore.Property, error) {
err := error(nil)
ret := datastore.Property{
NoIndex: in.IndexSetting() == ds.NoIndex,
}
switch in.Type() {
case ds.PTBytes:
v := in.Value().([]byte)
if in.IndexSetting() == ds.ShouldIndex {
ret.Value = datastore.ByteString(v)
} else {
ret.Value = v
}
case ds.PTKey:
ret.Value, err = dsF2R(ctx, in.Value().(*ds.Key))
case ds.PTBlobKey:
ret.Value = appengine.BlobKey(in.Value().(bs.Key))
case ds.PTGeoPoint:
ret.Value = appengine.GeoPoint(in.Value().(ds.GeoPoint))
default:
ret.Value = in.Value()
}
return ret, err
}