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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// modification, are permitted provided that the following conditions are
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//
// * Redistributions of source code must retain the above copyright
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#ifndef GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_WRITER_H__
#define GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_WRITER_H__
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/stubs/stringpiece.h>
namespace google {
namespace protobuf {
namespace util {
namespace converter {
class DataPiece;
// An ObjectWriter is an interface for writing a stream of events
// representing objects and collections. Implementation of this
// interface can be used to write an object stream to an in-memory
// structure, protobufs, JSON, XML, or any other output format
// desired. The ObjectSource interface is typically used as the
// source of an object stream.
//
// See JsonObjectWriter for a sample implementation of ObjectWriter
// and its use.
//
// Derived classes could be thread-unsafe.
//
// TODO(xinb): seems like a prime candidate to apply the RAII paradigm
// and get rid the need to call EndXXX().
class LIBPROTOBUF_EXPORT ObjectWriter {
public:
virtual ~ObjectWriter() {}
// Starts an object. If the name is empty, the object will not be named.
virtual ObjectWriter* StartObject(StringPiece name) = 0;
// Ends an object.
virtual ObjectWriter* EndObject() = 0;
// Starts a list. If the name is empty, the list will not be named.
virtual ObjectWriter* StartList(StringPiece name) = 0;
// Ends a list.
virtual ObjectWriter* EndList() = 0;
// Renders a boolean value.
virtual ObjectWriter* RenderBool(StringPiece name, bool value) = 0;
// Renders an 32-bit integer value.
virtual ObjectWriter* RenderInt32(StringPiece name, int32 value) = 0;
// Renders an 32-bit unsigned integer value.
virtual ObjectWriter* RenderUint32(StringPiece name, uint32 value) = 0;
// Renders a 64-bit integer value.
virtual ObjectWriter* RenderInt64(StringPiece name, int64 value) = 0;
// Renders an 64-bit unsigned integer value.
virtual ObjectWriter* RenderUint64(StringPiece name, uint64 value) = 0;
// Renders a double value.
virtual ObjectWriter* RenderDouble(StringPiece name, double value) = 0;
// Renders a float value.
virtual ObjectWriter* RenderFloat(StringPiece name, float value) = 0;
// Renders a StringPiece value. This is for rendering strings.
virtual ObjectWriter* RenderString(StringPiece name, StringPiece value) = 0;
// Renders a bytes value.
virtual ObjectWriter* RenderBytes(StringPiece name, StringPiece value) = 0;
// Renders a Null value.
virtual ObjectWriter* RenderNull(StringPiece name) = 0;
// Renders a DataPiece object to a ObjectWriter.
static void RenderDataPieceTo(const DataPiece& data, StringPiece name,
ObjectWriter* ow);
// Indicates whether this ObjectWriter has completed writing the root message,
// usually this means writing of one complete object. Subclasses must override
// this behavior appropriately.
virtual bool done() { return false; }
void set_use_strict_base64_decoding(bool value) {
use_strict_base64_decoding_ = value;
}
bool use_strict_base64_decoding() const {
return use_strict_base64_decoding_;
}
protected:
ObjectWriter() : use_strict_base64_decoding_(true) {}
private:
// If set to true, we use the stricter version of base64 decoding for byte
// fields by making sure decoded version encodes back to the original string.
bool use_strict_base64_decoding_;
// Do not add any data members to this class.
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ObjectWriter);
};
} // namespace converter
} // namespace util
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_WRITER_H__