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/*******************************************************************************

* Companion code for the book "Introduction to Software Design with Java",

* 2nd edition by Martin P. Robillard.

*

* Copyright (C) 2022 by Martin P. Robillard

*

* This code is licensed under a Creative Commons

* Attribution-NonCommercial-NoDerivatives 4.0 International License.

*

* See http://creativecommons.org/licenses/by-nc-nd/4.0/

*

*******************************************************************************/

package e2.chapter7;

/**

* Implementation of a playing card. This class yields immutable objects.

* This version of the class shows an application of the Flyweight design

* pattern where the flyweight store is pre-initialized.

*/

public class Card

{

// Flyweight store

private static final Card[][] CARDS = new Card[Suit.values().length][Rank.values().length];

private final Rank aRank;

private final Suit aSuit;

// Initialization of the flyweight store

static

{

for( Suit suit : Suit.values() )

{

for( Rank rank : Rank.values() )

{

CARDS[suit.ordinal()][rank.ordinal()] = new Card(rank, suit);

}

}

}

// Private constructor

private Card( Rank pRank, Suit pSuit)

{

aRank = pRank;

aSuit = pSuit;

}

/**

* @param pRank The rank of the requested card.

* @param pSuit The suit of the requested card.

* @return The unique Card instance with pRank and pSuit

* @pre pRank != null && pSuit != null

*/

public static Card get(Rank pRank, Suit pSuit)

{

assert pRank != null && pSuit != null;

return CARDS[pSuit.ordinal()][pRank.ordinal()];

}

/**

* @return The rank of the card.

*/

public Rank getRank()

{

return aRank;

}

/**

* @return The suit of the card.

*/

public Suit getSuit()

{

return aSuit;

}

@Override

public String toString()

{

return String.format("%s of %s", aRank, aSuit);

}

}