Template method pattern: Difference between revisions

Revision as of 14:32, 26 April 2023

Revision as of 14:30, 8 May 2023

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The Template pattern provides a solution. If the generated code follows the template method pattern, the generated code will all be an abstract superclass. Provided that hand-written customizations are confined to a subclass, the code generator can be run again without risk of over-writing these modifications. When used with code generation, this pattern is sometimes referred to as the [[Generation gap (pattern)|generation gap pattern]].<ref>{{cite book|last1=Vlissides|first1=John|title=Pattern Hatching: Design Patterns Applied|date=1998-06-22|publisher=Addison-Wesley Professional|isbn=978-0201432930|pages=85–101|url=http://www.informit.com/store/pattern-hatching-design-patterns-applied-9780201432930}}</ref>

==PHP example==

<syntaxhighlight lang="php">

abstract class Game

{

abstract protected void initialize();

abstract protected void startPlay();

abstract protected void endPlay();

/** Template method */

public final void play()

{

/** Primitive */

initialize();

/** Primitive */

startPlay();

/** Primitive */

endPlay();

}

}

class Mario extends Game

{

protected void initialize()

{

echo "Mario Game Initialized! Start playing.", PHP_EOL;

}

protected void startPlay()

{

echo "Mario Game Started. Enjoy the game!", PHP_EOL;

}

protected void endPlay()

{

echo "Mario Game Finished!", PHP_EOL;

}

}

class Tankfight extends Game

{

protected void initialize()

{

echo "Tankfight Game Initialized! Start playing.", PHP_EOL;

}

protected void startPlay()

{

echo "Tankfight Game Started. Enjoy the game!", PHP_EOL;

}

protected void endPlay()

{

echo "Tankfight Game Finished!", PHP_EOL;

}

}

$game = new Tankfight();

$game->play();

$game = new Mario();

$game->play();

</syntaxhighlight>

==C++ example==