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#ifndef NET_PROTO2_UTIL_CONVERTER_INTERNAL_DEFAULT_VALUE_OBJECTWRITER_H_
#define NET_PROTO2_UTIL_CONVERTER_INTERNAL_DEFAULT_VALUE_OBJECTWRITER_H_
#include <memory>
#include <stack>
#include <vector>
#include "base/macros.h"
#include "net/proto2/util/converter/internal/type_info.h"
#include "net/proto2/util/converter/public/datapiece.h"
#include "net/proto2/util/converter/public/object_writer.h"
#include "net/proto2/util/converter/public/utility.h"
#include "net/proto2/util/public/type_resolver.h"
#include "strings/stringpiece.h"
namespace proto2 {
namespace util {
namespace converter {
// An ObjectWriter that renders non-repeated primitive fields of proto messages
// with their default values. DefaultValueObjectWriter holds objects, lists and
// fields it receives in a tree structure and writes them out to another
// ObjectWriter when EndObject() is called on the root object. It also writes
// out all non-repeated primitive fields that haven't been explicitly rendered
// with their default values (0 for numbers, "" for strings, etc).
class DefaultValueObjectWriter : public ObjectWriter {
public:
#ifndef PROTO2_OPENSOURCE
DefaultValueObjectWriter(const TypeInfo& typeinfo,
const google::protobuf::Type& type,
ObjectWriter* ow);
#endif // !PROTO2_OPENSOURCE
DefaultValueObjectWriter(TypeResolver* type_resolver,
const google::protobuf::Type& type,
ObjectWriter* ow);
virtual ~DefaultValueObjectWriter();
// ObjectWriter methods.
virtual DefaultValueObjectWriter* StartObject(StringPiece name);
virtual DefaultValueObjectWriter* EndObject();
virtual DefaultValueObjectWriter* StartList(StringPiece name);
virtual DefaultValueObjectWriter* EndList();
virtual DefaultValueObjectWriter* RenderBool(StringPiece name, bool value);
virtual DefaultValueObjectWriter* RenderInt32(StringPiece name, int32 value);
virtual DefaultValueObjectWriter* RenderUint32(StringPiece name,
uint32 value);
virtual DefaultValueObjectWriter* RenderInt64(StringPiece name, int64 value);
virtual DefaultValueObjectWriter* RenderUint64(StringPiece name,
uint64 value);
virtual DefaultValueObjectWriter* RenderDouble(StringPiece name,
double value);
virtual DefaultValueObjectWriter* RenderFloat(StringPiece name, float value);
virtual DefaultValueObjectWriter* RenderString(StringPiece name,
StringPiece value);
#ifdef PROTO2_OPENSOURCE
virtual DefaultValueObjectWriter* RenderBytes(StringPiece name,
StringPiece value);
#else // PROTO2_OPENSOURCE
virtual DefaultValueObjectWriter* RenderCord(StringPiece name,
const Cord& value);
#endif // !PROTO2_OPENSOURCE
virtual DefaultValueObjectWriter* RenderNull(StringPiece name);
virtual DefaultValueObjectWriter* DisableCaseNormalizationForNextKey();
private:
enum NodeKind {
PRIMITIVE = 0,
OBJECT = 1,
LIST = 2,
MAP = 3,
};
// "Node" represents a node in the tree that holds the input of
// DefaultValueObjectWriter.
class Node {
public:
Node(const string& name, const google::protobuf::Type* type, NodeKind kind,
const DataPiece& data, bool is_placeholder);
virtual ~Node() {
for (int i = 0; i < children_.size(); ++i) {
delete children_[i];
}
}
// Adds a child to this node. Takes ownership of this child.
void AddChild(Node* child) { children_.push_back(child); }
// Finds the child given its name.
Node* FindChild(StringPiece name);
// Populates children of this Node based on its type. If there are already
// children created, they will be merged to the result. Caller should pass
// in TypeInfo for looking up types of the children.
void PopulateChildren(const TypeInfo* typeinfo);
// If this node is a leaf (has data), writes the current node to the
// ObjectWriter; if not, then recursively writes the children to the
// ObjectWriter.
void WriteTo(ObjectWriter* ow);
// Accessors
const string& name() const { return name_; }
const google::protobuf::Type* type() { return type_; }
void set_type(const google::protobuf::Type* type) { type_ = type; }
NodeKind kind() { return kind_; }
int number_of_children() { return children_.size(); }
void set_data(const DataPiece& data) { data_ = data; }
void set_disable_normalize(bool disable_normalize) {
disable_normalize_ = disable_normalize;
}
bool is_any() { return is_any_; }
void set_is_any(bool is_any) { is_any_ = is_any; }
void set_is_placeholder(bool is_placeholder) {
is_placeholder_ = is_placeholder;
}
private:
// Returns the Value Type of a map given the Type of the map entry and a
// TypeInfo instance.
const google::protobuf::Type* GetMapValueType(
const google::protobuf::Type& entry_type, const TypeInfo* typeinfo);
// Calls WriteTo() on every child in children_.
void WriteChildren(ObjectWriter* ow);
// The name of this node.
string name_;
// google::protobuf::Type of this node. Owned by TypeInfo.
const google::protobuf::Type* type_;
// The kind of this node.
NodeKind kind_;
// Whether to disable case normalization of the name.
bool disable_normalize_;
// Whether this is a node for "Any".
bool is_any_;
// The data of this node when it is a leaf node.
DataPiece data_;
// Children of this node.
std::vector<Node*> children_;
// Whether this node is a placeholder for an object or list automatically
// generated when creating the parent node. Should be set to false after
// the parent node's StartObject()/StartList() method is called with this
// node's name.
bool is_placeholder_;
};
// Populates children of "node" if it is an "any" Node and its real type has
// been given.
void MaybePopulateChildrenOfAny(Node* node);
// Writes the root_ node to ow_ and resets the root_ and current_ pointer to
// nullptr.
void WriteRoot();
// Creates a DataPiece containing the default value of the type of the field.
static DataPiece CreateDefaultDataPieceForField(
const google::protobuf::Field& field);
// Returns disable_normalize_ and reset it to false.
bool GetAndResetDisableNormalize() {
return disable_normalize_ ? (disable_normalize_ = false, true) : false;
}
// Adds or replaces the data_ of a primitive child node.
void RenderDataPiece(StringPiece name, const DataPiece& data);
// Type information for all the types used in the descriptor. Used to find
// google::protobuf::Type of nested messages/enums.
const TypeInfo* typeinfo_;
// Whether the TypeInfo object is owned by this class.
bool own_typeinfo_;
// google::protobuf::Type of the root message type.
const google::protobuf::Type& type_;
// Holds copies of strings passed to RenderString.
vector<string*> string_values_;
// Whether to disable case normalization of the next node.
bool disable_normalize_;
// The current Node. Owned by its parents.
Node* current_;
// The root Node.
std::unique_ptr<Node> root_;
// The stack to hold the path of Nodes from current_ to root_;
std::stack<Node*> stack_;
ObjectWriter* ow_;
DISALLOW_COPY_AND_ASSIGN(DefaultValueObjectWriter);
};
} // namespace converter
} // namespace util
} // namespace proto2
#endif // NET_PROTO2_UTIL_CONVERTER_INTERNAL_DEFAULT_VALUE_OBJECTWRITER_H_
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