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

go/src/infra/gae/libs/wrapper/memory/internal/goon/goon.go

+/*
+ * Copyright (c) 2012 Matt Jibson <matt.jibson@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package goon
+
+import (
+        "fmt"
+        "reflect"
+        "strings"
+
+        "appengine/datastore"
+
+        "github.com/mjibson/goon"
+)
+
+// SetStructKey assigns a datastore.Key into a goon-style struct.
+// Copied from goon since it's internal and we need to populate the completed
+// key after a Datastore.Put()
+func SetStructKey(src interface{}, key *datastore.Key, knr goon.KindNameResolver) error {
+        v := reflect.ValueOf(src)
+        t := v.Type()
+        k := t.Kind()
+
+        if k != reflect.Ptr {
+                return fmt.Errorf("goon: Expected pointer to struct, got instead: %v", k)
+        }
+
+        v = reflect.Indirect(v)
+        t = v.Type()
+        k = t.Kind()
+
+        if k != reflect.Struct {
+                return fmt.Errorf(fmt.Sprintf("goon: Expected struct, got instead: %v", k))
+        }
+
+        idSet := false
+        kindSet := false
+        parentSet := false
+        for i := 0; i < v.NumField(); i++ {
+                tf := t.Field(i)
+                vf := v.Field(i)
+
+                if !vf.CanSet() {
+                        continue
+                }
+
+                tag := tf.Tag.Get("goon")
+                tagValues := strings.Split(tag, ",")
+                if len(tagValues) > 0 {
+                        tagValue := tagValues[0]
+                        if tagValue == "id" {
+                                if idSet {
+                                        return fmt.Errorf("goon: Only one field may be marked id")
+                                }
+
+                                switch vf.Kind() {
+                                case reflect.Int64:
+                                        vf.SetInt(key.IntID())
+                                        idSet = true
+                                case reflect.String:
+                                        vf.SetString(key.StringID())
+                                        idSet = true
+                                }
+                        } else if tagValue == "kind" {
+                                if kindSet {
+                                        return fmt.Errorf("goon: Only one field may be marked kind")
+                                }
+                                if vf.Kind() == reflect.String {
+                                        if (len(tagValues) <= 1 || key.Kind() != tagValues[1]) && knr(src) != key.Kind() {
+                                                vf.Set(reflect.ValueOf(key.Kind()))
+                                        }
+                                        kindSet = true
+                                }
+                        } else if tagValue == "parent" {
+                                if parentSet {
+                                        return fmt.Errorf("goon: Only one field may be marked parent")
+                                }
+                                if vf.Type() == reflect.TypeOf(&datastore.Key{}) {
+                                        vf.Set(reflect.ValueOf(key.Parent()))
+                                        parentSet = true
+                                }
+                        }
+                }
+        }
+
+        if !idSet {
+                return fmt.Errorf("goon: Could not set id field")
+        }
+
+        return nil
+}