ContentType.h

/*
 * Copyright (C) 2020-2026 by Marc Boris Duerner
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */
 
#ifndef PT_MCP_CONTENTTYPE_H
#define PT_MCP_CONTENTTYPE_H
 
#include <Pt/Mcp/Api.h>
#include <Pt/Formatter.h>
#include <string>
 
namespace Pt {
 
namespace Mcp {
 
class PT_MCP_API ContentFormatter
{
  public:
    virtual ~ContentFormatter();
 
    Pt::Formatter& beginContent(std::ostream& os);
 
    void finishContent(std::ostream& os);
 
  protected:
    ContentFormatter();
 
    virtual void onBeginContent() = 0;
 
    virtual Pt::Formatter& onBeginFormat() = 0;
 
    virtual void onFinishContent() = 0;
 
    void write(const char* s, std::size_t n);
 
    std::ostream& output() const
    { return *_os; }
 
  private:
    std::ostream* _os;
};
 
class PT_MCP_API ContentType
{
  public:
    virtual ~ContentType();
 
    virtual ContentFormatter* getFormatter() const = 0;
 
    virtual void releaseFormatter(ContentFormatter* formatter) const = 0;
};
 
 
class PT_MCP_API TextContent : public ContentType
{
  public:
    TextContent();
 
    ContentFormatter* getFormatter() const override;
 
    void releaseFormatter(ContentFormatter* formatter) const override;
};
 
PT_MCP_API const TextContent& textContent();
 
 
class PT_MCP_API ImageContent : public ContentType
{
  public:
    explicit ImageContent(const std::string& mimeType = "image/png");
 
    ContentFormatter* getFormatter() const override;
 
    void releaseFormatter(ContentFormatter* formatter) const override;
 
  private:
    std::string _mimeType;
};
 
PT_MCP_API const ImageContent& imageContent();
 
} // namespace Mcp
 
} // namespace Pt
 
#endif // PT_MCP_CONTENTTYPE_H