[Sync] Add sync_export.h (Step 1 for componentizing sync)

sync/internal_api/public/base/model_type.h

 // Copyright (c) 2012 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.
 
 // Enumerate the various item subtypes that are supported by sync.
 // Each sync object is expected to have an immutable object type.
 // An object's type is inferred from the type of data it holds.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_BASE_MODEL_TYPE_H_
 #define SYNC_INTERNAL_API_PUBLIC_BASE_MODEL_TYPE_H_
 
 #include <set>
 #include <string>
 
 #include "base/logging.h"
 #include "base/time.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/enum_set.h"
 
 namespace base {
 class ListValue;
 class StringValue;
 class Value;
 }
 
 namespace sync_pb {
 class EntitySpecifics;
 class SyncEntity;
 }
 
 namespace syncer {
 
+// TODO(akalin): Move the non-exported functions in this file to a
+// private header.
+
 enum ModelType {
   // Object type unknown.  Objects may transition through
   // the unknown state during their initial creation, before
   // their properties are set.  After deletion, object types
   // are generally preserved.
   UNSPECIFIED,
   // A permanent folder whose children may be of mixed
   // datatypes (e.g. the "Google Chrome" folder).
   TOP_LEVEL_FOLDER,
 
@@ skipping 51 matching lines @@
   ModelType, FIRST_REAL_MODEL_TYPE, LAST_REAL_MODEL_TYPE> ModelTypeSet;
 typedef syncer::EnumSet<
   ModelType, UNSPECIFIED, LAST_REAL_MODEL_TYPE> FullModelTypeSet;
 
 inline ModelType ModelTypeFromInt(int i) {
   DCHECK_GE(i, 0);
   DCHECK_LT(i, MODEL_TYPE_COUNT);
   return static_cast<ModelType>(i);
 }
 
-void AddDefaultFieldValue(ModelType datatype,
-                          sync_pb::EntitySpecifics* specifics);
+// Used by tests outside of sync/.
+SYNC_EXPORT void AddDefaultFieldValue(ModelType datatype,
+                                      sync_pb::EntitySpecifics* specifics);
 
 // Extract the model type of a SyncEntity protocol buffer.  ModelType is a
 // local concept: the enum is not in the protocol.  The SyncEntity's ModelType
 // is inferred from the presence of particular datatype field in the
 // entity specifics.
 ModelType GetModelType(const sync_pb::SyncEntity& sync_entity);
 
 // Extract the model type from an EntitySpecifics field.  Note that there
 // are some ModelTypes (like TOP_LEVEL_FOLDER) that can't be inferred this way;
 // prefer using GetModelType where possible.
-ModelType GetModelTypeFromSpecifics(const sync_pb::EntitySpecifics& specifics);
+SYNC_EXPORT ModelType GetModelTypeFromSpecifics(
+    const sync_pb::EntitySpecifics& specifics);
 
 // If this returns false, we shouldn't bother maintaining a position
 // value (sibling ordering) for this item.
 bool ShouldMaintainPosition(ModelType model_type);
 
 // Determine a model type from the field number of its associated
 // EntitySpecifics field.
 ModelType GetModelTypeFromSpecificsFieldNumber(int field_number);
 
 // Return the field number of the EntitySpecifics field associated with
 // a model type.
-int GetSpecificsFieldNumberFromModelType(ModelType model_type);
+//
+// Used by tests outside of sync.
+SYNC_EXPORT int GetSpecificsFieldNumberFromModelType(
+    ModelType model_type);
 
 // TODO(sync): The functions below badly need some cleanup.
 
 // Returns a pointer to a string with application lifetime that represents
 // the name of |model_type|.
-const char* ModelTypeToString(ModelType model_type);
+SYNC_EXPORT const char* ModelTypeToString(ModelType model_type);
 
 // Handles all model types, and not just real ones.
 //
 // Caller takes ownership of returned value.
 base::StringValue* ModelTypeToValue(ModelType model_type);
 
 // Converts a Value into a ModelType - complement to ModelTypeToValue().
 ModelType ModelTypeFromValue(const base::Value& value);
 
 // Returns the ModelType corresponding to the name |model_type_string|.
-ModelType ModelTypeFromString(const std::string& model_type_string);
+SYNC_EXPORT ModelType ModelTypeFromString(
+    const std::string& model_type_string);
 
-std::string ModelTypeSetToString(ModelTypeSet model_types);
+SYNC_EXPORT std::string ModelTypeSetToString(ModelTypeSet model_types);
 
 // Caller takes ownership of returned list.
-base::ListValue* ModelTypeSetToValue(ModelTypeSet model_types);
+SYNC_EXPORT base::ListValue* ModelTypeSetToValue(ModelTypeSet model_types);
 
-ModelTypeSet ModelTypeSetFromValue(const base::ListValue& value);
+SYNC_EXPORT ModelTypeSet ModelTypeSetFromValue(const base::ListValue& value);
 
 // Returns a string corresponding to the syncable tag for this datatype.
-std::string ModelTypeToRootTag(ModelType type);
+SYNC_EXPORT std::string ModelTypeToRootTag(ModelType type);
 
 // Convert a real model type to a notification type (used for
 // subscribing to server-issued notifications).  Returns true iff
 // |model_type| was a real model type and |notification_type| was
 // filled in.
 bool RealModelTypeToNotificationType(ModelType model_type,
                                      std::string* notification_type);
 
 // Converts a notification type to a real model type.  Returns true
 // iff |notification_type| was the notification type of a real model
 // type and |model_type| was filled in.
 bool NotificationTypeToRealModelType(const std::string& notification_type,
                                      ModelType* model_type);
 
 // Returns true if |model_type| is a real datatype
-bool IsRealDataType(ModelType model_type);
+SYNC_EXPORT bool IsRealDataType(ModelType model_type);
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_BASE_MODEL_TYPE_H_