/**
@author  Scott Marshall
@author  University of Glasgow, MSc IT Project 2001
@author  Building an OnLine Course in Computing Fundamentals
*/


package ukacgla_3inputKMap;

import ukacgla_KMap.*;
import java.util.*;

class Minterm extends Abstract_Minterm {


	public Minterm(String b, int rows, int cols){	
		super(b, rows, cols);
	}


	/**
	Begin reading dataMap for specific sequences. 
	If sequence is met, append chars to answer, and reset data in table
	Finally, make this instance of minterm a copy of answer.
	*/
	public void simplify(){
		
		StringBuffer answer = new StringBuffer();
		
		//check for !x for complete rows
		if (dataMap[0][0] == 1 && dataMap[0][1] ==1  && dataMap[0][2] ==1  && dataMap[0][3] ==1){
			answer.append("!x +");
			for (int i = 0; i< dataMapCols; i++)
				dataMap[0][i] = 0;
		}	
		
		//check for x	
		if (dataMap[1][0] == 1 && dataMap[1][1] ==1  && dataMap[1][2] ==1  && dataMap[1][3] ==1){
			answer.append("x +");
			for (int i = 0; i< dataMapCols; i++)
				dataMap[1][i] = 0;
		}	
		
		//then check for 2 x 2 vertical columns
		//check for 2 x 2 of !y
		if (dataMap[0][0] ==1 && dataMap[1][0] ==1 && dataMap[0][3] ==1 && dataMap[1][3] ==1){
			answer.append("!y +");
			dataMap[0][0] = 0;
			dataMap[1][0] = 0;			
			dataMap[0][3] = 0;
			dataMap[1][3] = 0;
		}
		
		
		//check for 2 x 2 of !z
		if (dataMap[0][0] ==1 && dataMap[1][0] ==1 && dataMap[0][1] ==1 && dataMap[1][1] ==1){
			answer.append("!z +");
			dataMap[0][0] = 0;
			dataMap[1][0] = 0;			
			dataMap[0][1] = 0;
			dataMap[1][1] = 0;
		}
		
		
		
		//check for 2 x 2 of y
		if (dataMap[0][1] ==1 && dataMap[0][2] ==1 && dataMap[1][1] ==1 && dataMap[1][2] ==1) {
			answer.append("y +");
			dataMap[0][1] = 0;
			dataMap[0][2] = 0;			
			dataMap[1][1] = 0;
			dataMap[1][2] = 0;
		}
		
		
		//check for 2 x 2 of z
		if (dataMap[0][2] ==1 && dataMap[0][3] ==1 && dataMap[1][2] ==1 && dataMap[1][3] ==1)	{
			answer.append("z +");
			dataMap[0][2] = 0;
			dataMap[0][3] = 0;			
			dataMap[1][2] = 0;
			dataMap[1][3] = 0;
		}
		
		//then check for individual columns

		//check for first column
		if (dataMap[0][0] ==1 && dataMap[1][0] ==1)	{
			answer.append("!y!z +");
			dataMap[0][0] = 0;
			dataMap[1][0] = 0;			
		}

		//check for second column.
		if (dataMap[0][1] == 1 && dataMap[1][1] ==1)	{
			answer.append("y!z +");
			dataMap[0][1] = 0;
			dataMap[1][1] = 0;			
		}

		//check for third column
		if (dataMap[0][2] == 1 && dataMap[1][2] ==1)	{
			answer.append("yz +");
			dataMap[0][2] = 0;
			dataMap[1][2] = 0;			
		}

		//check for fourth column.
		if (dataMap[0][3] == 1 && dataMap[1][3] ==1)	{
			answer.append("!yz +");
			dataMap[0][3] = 0;
			dataMap[1][3] = 0;			
		}

		//then begin checking for pairs along the rows.
		//!x row, !y
		if (dataMap[0][0] ==1 && dataMap[0][3] ==1)	{
			answer.append("!x!y +");
			dataMap[0][0] = 0;
			dataMap[0][3] = 0;			
		}

		//!x row, y
		if (dataMap[0][1] ==1 && dataMap[0][2] ==1)	{
			answer.append("!xy +");
			dataMap[0][1] = 0;
			dataMap[0][2] = 0;			
		}


		//!x row, !z
		if (dataMap[0][0] ==1 && dataMap[0][1] ==1)	{
			answer.append("!x!z +");
			dataMap[0][0] = 0;
			dataMap[0][1] = 0;			
		}

		//!x row, z
		if (dataMap[0][2] ==1 && dataMap[0][3] ==1)	{
			answer.append("!xz +");
			dataMap[0][2] = 0;
			dataMap[0][3] = 0;			
		}


		//x row, !y
		if (dataMap[1][0] ==1 && dataMap[1][3] ==1)	{
			answer.append("x!y +");
			dataMap[1][0] = 0;
			dataMap[1][3] = 0;			
		}

		//x row, y
		if (dataMap[1][1] ==1 && dataMap[1][2] ==1)	{
			answer.append("xy +");
			dataMap[1][1] = 0;
			dataMap[1][2] = 0;			
		}


		//x row, !z
		if (dataMap[1][0] ==1 && dataMap[1][1] ==1)	{
			answer.append("x!z +");
			dataMap[1][0] = 0;
			dataMap[1][1] = 0;			
		}

		//x row, z
		if (dataMap[1][2] ==1 && dataMap[1][3] ==1)	{
			answer.append("xz +");
			dataMap[1][2] = 0;
			dataMap[1][3] = 0;			
		}

		//then begin looking for ones !
		if (dataMap[0][0]==1)
			answer.append("!x!y!z +");

		if (dataMap[0][1]==1)
			answer.append("!xy!z +");

		if (dataMap[0][2]==1)
			answer.append("!xyz +");

		if (dataMap[0][3]==1)
			answer.append("!x!yz +");

		if (dataMap[1][0]==1)
			answer.append("x!y!z +");

		if (dataMap[1][1]==1)
			answer.append("xy!z +");

		if (dataMap[1][2]==1)
			answer.append("xyz +");

		if (dataMap[1][3]==1)
			answer.append("x!yz +");



		//delete excess +'s.
		int length = answer.length();
		if (answer.charAt(length-1)=='+')
			answer.deleteCharAt(length-1);
	
		this.minterm = answer;

	}//ends simplify()
	

}