make StreamWriterBuilder concrete

include/json/writer.h

@@ -58,58 +58,43 @@ public:
   /// \throw std::exception possibly, depending on configuration
   virtual int write(Value const& root) = 0;
 
-  /// Because this Builder is non-virtual, we can safely add
-  /// methods without a major version bump.
-  /// \see http://stackoverflow.com/questions/14875052/pure-virtual-functions-and-binary-compatibility
-  class JSON_API Builder {
-    StreamWriterBuilder* own_;
-    Builder(Builder const&);  // noncopyable
-    void operator=(Builder const&);  // noncopyable
-  public:
-    Builder();
-    ~Builder();  // delete underlying StreamWriterBuilder
-
-    Builder& withCommentStyle(CommentStyle cs);  /// default: All
-    /** \brief Write in human-friendly style.
-
-        If "", then skip all indentation, newlines, and comments,
-        which implies CommentStyle::None.
-        Default: "\t"
-    */
-    Builder& withIndentation(std::string indentation);
-
-    /// Do not take ownership of sout, but maintain a reference.
-    StreamWriter* newStreamWriter(std::ostream* sout) const;
-  };
-
   /** \brief A simple abstract factory.
    */
   class JSON_API Factory {
   public:
     virtual ~Factory();
-    /* Because this is only a trivial API (the Factory pattern), we will
-     * never need to add virtual methods, so we do not need a concrete wrapper.
-     * This is better than the Builder above, but not everyone will agree.
-     */
-
     /// Do not take ownership of sout, but maintain a reference.
     virtual StreamWriter* newStreamWriter(std::ostream* sout) const = 0;
-  };
-
-  /** \brief Extensions of this are used to create a StreamWriter::Factory.
-   */
-  class JSON_API FactoryFactory {
-    virtual ~FactoryFactory();
-    virtual Factory* newFactory() const = 0;
-    /* This class will seem strange to some developers, but it actually
-     * simplifies our library maintenance.
-     */
-  };
-
-};
+  };  // Factory
+};  // StreamWriter
 
 /// \brief Write into stringstream, then return string, for convenience.
-std::string writeString(Value const& root, StreamWriter::Builder const& builder);
+std::string writeString(Value const& root, StreamWriter::Factory const& factory);
+
+
+/** \brief Build a StreamWriter implementation.
+ */
+class JSON_API StreamWriterBuilder : public StreamWriter::Factory {
+  // typedef StreamWriter::CommentStyle CommentStyle;
+public:
+  // Note: We cannot add data-members to this class without a major version bump.
+  // So these might as well be completely exposed.
+
+  /** \brief How to write comments.
+   * Default: All
+   */
+  StreamWriter::CommentStyle cs_ = StreamWriter::CommentStyle::All;
+  /** \brief Write in human-friendly style.
+
+      If "", then skip all indentation and newlines.
+      In that case, you probably want CommentStyle::None also.
+      Default: "\t"
+  */
+  std::string indentation_ = "\t";
+
+  /// Do not take ownership of sout, but maintain a reference.
+  StreamWriter* newStreamWriter(std::ostream* sout) const;
+};
 
 /** \brief Build a StreamWriter implementation.
  * Comments are not written, and most whitespace is omitted.
@@ -124,7 +109,7 @@ std::string writeString(Value const& root, StreamWriter::Builder const& builder)
  *   delete w;
  * \endcode
  */
-class JSON_API OldCompressingStreamWriterBuilder
+class JSON_API OldCompressingStreamWriterBuilder : public StreamWriter::Factory
 {
 public:
   // Note: We cannot add data-members to this class without a major version bump.

src/jsontestrunner/main.cpp

@@ -184,8 +184,7 @@ static std::string useStyledStreamWriter(
 static std::string useBuiltStyledStreamWriter(
     Json::Value const& root)
 {
-  Json::StreamWriter::Builder builder;
-  builder.withCommentStyle(Json::StreamWriter::CommentStyle::All);
+  Json::StreamWriterBuilder builder;
   return writeString(root, builder);
 }
 static int rewriteValueTree(

src/lib_json/json_writer.cpp

@@ -959,34 +959,8 @@ int MyStreamWriter::write(Value const& root)
   sout_ << root;
   return 0;
 }
-class StreamWriterBuilder {
-  typedef StreamWriter::CommentStyle CommentStyle;
-  CommentStyle cs_;
-  std::string indentation_;
-public:
-  StreamWriterBuilder();
-  virtual ~StreamWriterBuilder();
-  virtual void setCommentStyle(CommentStyle cs);
-  virtual void setIndentation(std::string indentation);
-  virtual StreamWriter* newStreamWriter(std::ostream* sout) const;
-};
-StreamWriterBuilder::StreamWriterBuilder()
-  : cs_(CommentStyle::All)
-  , indentation_("\t")
-{
-}
-StreamWriterBuilder::~StreamWriterBuilder()
-{
-}
-void StreamWriterBuilder::setCommentStyle(CommentStyle v)
-{
-  cs_ = v;
-}
-void StreamWriterBuilder::setIndentation(std::string v)
-{
-  indentation_ = v;
-  if (indentation_.empty()) cs_ = CommentStyle::None;
-}
+StreamWriter::Factory::~Factory()
+{}
 StreamWriter* StreamWriterBuilder::newStreamWriter(std::ostream* stream) const
 {
   std::string colonSymbol = " : ";
@@ -999,7 +973,7 @@ StreamWriter* StreamWriterBuilder::newStreamWriter(std::ostream* stream) const
       indentation_, cs_,
       colonSymbol, nullSymbol, endingLineFeedSymbol);
 }
-
+/*
 // This might become public someday.
 class StreamWriterBuilderFactory {
 public:
@@ -1013,35 +987,7 @@ StreamWriterBuilder* StreamWriterBuilderFactory::newStreamWriterBuilder() const
 {
   return new StreamWriterBuilder;
 }
-
-StreamWriter::Builder::Builder()
-    : own_(StreamWriterBuilderFactory().newStreamWriterBuilder())
-{
-}
-StreamWriter::Builder::~Builder()
-{
-  delete own_;
-}
-StreamWriter::Builder::Builder(Builder const&)
-  : own_(nullptr)
-{abort();}
-void StreamWriter::Builder::operator=(Builder const&)
-{abort();}
-StreamWriter::Builder& StreamWriter::Builder::withCommentStyle(CommentStyle v)
-{
-  own_->setCommentStyle(v);
-  return *this;
-}
-StreamWriter::Builder& StreamWriter::Builder::withIndentation(std::string v)
-{
-  own_->setIndentation(v);
-  return *this;
-}
-StreamWriter* StreamWriter::Builder::newStreamWriter(
-    std::ostream* sout) const
-{
-  return own_->newStreamWriter(sout);
-}
+*/
 
 StreamWriter* OldCompressingStreamWriterBuilder::newStreamWriter(
     std::ostream* stream) const
@@ -1065,7 +1011,7 @@ StreamWriter* OldCompressingStreamWriterBuilder::newStreamWriter(
       colonSymbol, nullSymbol, endingLineFeedSymbol);
 }
 
-std::string writeString(Value const& root, StreamWriter::Builder const& builder) {
+std::string writeString(Value const& root, StreamWriter::Factory const& builder) {
   std::ostringstream sout;
   std::unique_ptr<StreamWriter> const sw(builder.newStreamWriter(&sout));
   sw->write(root);
@@ -1073,9 +1019,7 @@ std::string writeString(Value const& root, StreamWriter::Builder const& builder)
 }
 
 std::ostream& operator<<(std::ostream& sout, Value const& root) {
-  StreamWriter::Builder builder;
-  builder.withCommentStyle(StreamWriter::CommentStyle::All);
-  builder.withIndentation("\t");
+  StreamWriterBuilder builder;
   std::shared_ptr<StreamWriter> writer(builder.newStreamWriter(&sout));
   writer->write(root);
   return sout;