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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// examples/Web_Crawler
//
// = FILENAME
// URL_Visitor_Factory.h
//
// = AUTHOR
// Douglas C. Schmidt <schmidt@cs.wustl.edu>
//
// ============================================================================
#ifndef _URL_VISITOR_FACTORY_H
#define _URL_VISITOR_FACTORY_H
#include "URL_Visitor.h"
#include "Command_Processor.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#define ACE_LACKS_PRAGMA_ONCE
#endif /* ACE_LACKS_PRAGMA_ONCE */
class URL_Visitor_Factory
{
// = TITLE
// Abstract base class that creates URL visitors.
//
// = DESCRIPTION
// Subclasses define each of the Factory Methods to
// make the right objects, which all "vary" together.
public:
virtual URL_Visitor *make_visitor (void) = 0;
// Factory Method that makes the appropriate type of <URL_Visitor>.
virtual Command_Processor *make_command_processor (void) = 0;
// Factory Method that makes the appropriate type of
// <Command_Processor>.
};
class URL_Validation_Visitor_Factory : public URL_Visitor_Factory
{
// = TITLE
// Create a URL visitor that validates URL links.
public:
virtual URL_Visitor *make_visitor (void);
// Factory Method that makes a <URL_Validation_Visitor>.
virtual Command_Processor *make_command_processor (void);
// Factory Method that makes a <FIFO_Command_Processor>.
};
class URL_Download_Visitor_Factory : public URL_Visitor_Factory
{
// = TITLE
// Create a URL visitor that downloads URL links.
public:
virtual URL_Visitor *make_visitor (void);
// Factory Method that makes a <URL_Download_Visitor>.
virtual Command_Processor *make_command_processor (void);
// Factory Method that makes a <FIFO_Command_Processor>.
};
#endif /* _URL_VISITOR_FACTORY_H */
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