//C4Row.java
/**
*
* @author Sean Bridges
* @version 1.0
*
* The C4Row contains 4 slots in a row. It listens to those slots, and
* counts the number of slots each player occupies.
* It informs the stat object when a player has significant combinations
* of the stats.
*/
public final class C4Row implements C4SlotListener
{
//-----------------------------------------------
//instance variables
//number of each type contained in my slots
int numPlayer1 = 0;
int numPlayer2 = 0;
C4Stats stats;
//-----------------------------------------------
//constructors
/** Creates new C4Row
*
* It is assumed that all the slots are empty.
*/
public C4Row(C4Slot s1, C4Slot s2, C4Slot s3, C4Slot s4, C4Stats stats)
{
s1.addSlotListener(this);
s2.addSlotListener(this);
s3.addSlotListener(this);
s4.addSlotListener(this);
this.stats = stats;
}
public void contentsChanged(int oldContents,int newContents)
{
//case 1, moving from null to first player
if(oldContents == C4Board.NULL_PLAYER_NUMBER &
newContents == C4Board.FIRST_PLAYER_NUMBER)
{
//if we had no second player tokens, we now have a better score
//for the first player, tell the stats.
if(numPlayer2 == 0)
{
switch(numPlayer1)
{
case 0: stats.p1_1InARowInc();
break;
case 1: stats.p1_1InARowDec();
stats.p1_2InARowInc();
break;
case 2: stats.p1_2InARowDec();
stats.p1_3InARowInc();
break;
case 3: stats.p1_3InARowDec();
stats.p1_4InARowInc();
break;
default: errorPrint();
}//end switch player 1
}//end if numPlayer2 = 0
//if we have some second player tokens, and
//we had no first player tokens, we are no longer populated
//exclusively by second player tokens, change the stats
else if(numPlayer1 == 0)
{
switch(numPlayer2)
{
case 0:
break;
case 1: stats.p2_1InARowDec();
break;
case 2: stats.p2_2InARowDec();
break;
case 3: stats.p2_3InARowDec();
break;
default: errorPrint();
}//end switch player 1
}
}//end if old = null, new = player 1
//case 2, moving from null to second player
else if(oldContents == C4Board.NULL_PLAYER_NUMBER &
newContents == C4Board.SECOND_PLAYER_NUMBER)
{
//if we had no first player tokens, we now have a better score
//for the second player, tell the stats.
if(numPlayer1 == 0)
{
switch(numPlayer2)
{
case 0: stats.p2_1InARowInc();
break;
case 1: stats.p2_1InARowDec();
stats.p2_2InARowInc();
break;
case 2: stats.p2_2InARowDec();
stats.p2_3InARowInc();
break;
case 3: stats.p2_3InARowDec();
stats.p2_4InARowInc();
break;
default: errorPrint();
}//end switch player 2
}//end if numPlayer1 = 0
//if we have some first player tokens,
//and we had no second player tokens, then we are no
//longer populated exclusively by first player tokens
else if(numPlayer2 == 0)
{
switch(numPlayer1)
{
case 0:
break;
case 1: stats.p1_1InARowDec();
break;
case 2: stats.p1_2InARowDec();
break;
case 3: stats.p1_3InARowDec();
break;
default: errorPrint();
}//end switch player 1
}
}//end if old = null, new = player 2
//case 3, moving from player 1 to null
else if(oldContents == C4Board.FIRST_PLAYER_NUMBER &
newContents == C4Board.NULL_PLAYER_NUMBER)
{
//if no player 2 tokens, we have a worse score
if(numPlayer2 == 0)
{
switch(numPlayer1)
{
case 1: stats.p1_1InARowDec();
break;
case 2: stats.p1_2InARowDec();
stats.p1_1InARowInc();
break;
case 3: stats.p1_3InARowDec();
stats.p1_2InARowInc();
break;
case 4: stats.p1_4InARowDec();
stats.p1_3InARowInc();
break;
default: errorPrint();
}//end switch player 1
}//end if numPlayer2 == 0
//if there was only 1 player 1 token, then we now have a score for p2
if(numPlayer1 == 1)
{
switch(numPlayer2)
{
case 0:
break;
case 1: stats.p2_1InARowInc();
break;
case 2: stats.p2_2InARowInc();
break;
case 3: stats.p2_3InARowInc();
break;
default: errorPrint();
}//end switch player 2
}//end if numPlayer1 == 1
}//end old = p1, new = null
//case 4, moving from player 2 to null
else if(oldContents == C4Board.SECOND_PLAYER_NUMBER &
newContents == C4Board.NULL_PLAYER_NUMBER)
{
//if no player 1 tokens, we have a worse score
if(numPlayer1 == 0)
{
switch(numPlayer2)
{
case 1: stats.p2_1InARowDec();
break;
case 2: stats.p2_2InARowDec();
stats.p2_1InARowInc();
break;
case 3: stats.p2_3InARowDec();
stats.p2_2InARowInc();
break;
case 4: stats.p2_4InARowDec();
stats.p2_3InARowInc();
break;
default: errorPrint();
}//end switch player 2
}//end if numPlayer1 == 0
//if there was only 1 player 2 token, then we now have a score for p1
if(numPlayer2 == 1)
{
switch(numPlayer1)
{
case 0:
break;
case 1: stats.p1_1InARowInc();
break;
case 2: stats.p1_2InARowInc();
break;
case 3: stats.p1_3InARowInc();
break;
default: errorPrint();
}//end switch player 1
}//end if numPlayer2 == 1
}//end old = p2, new = null
if(newContents == C4Board.FIRST_PLAYER_NUMBER)
{
numPlayer1++;
}
else if(newContents == C4Board.SECOND_PLAYER_NUMBER)
{
numPlayer2++;
}
else if(newContents == C4Board.NULL_PLAYER_NUMBER)
{
if(oldContents == C4Board.FIRST_PLAYER_NUMBER)
{
numPlayer1--;
}
else if(oldContents == C4Board.SECOND_PLAYER_NUMBER)
{
numPlayer2--;
}
}
}//end contentsChanged
private void errorPrint()
{
System.err.println("Error in Row state, inconsistent values");
Thread.dumpStack();
System.err.println(stats);
System.exit(0);
}
}//end class C4Row