package com.mycompany.matrix;

import com.mycompany.summatrixexception.*;

import java.lang.String;
import java.lang.StringBuffer;

import mycompany.productmatrixexception.*;

	public class Matrix{
		protected int row  = 0;
		protected int column = 0;
		protected int array[][];

	    public Matrix (int row, int column){
	       
	        if(row < 0 || column < 0) throw new  RuntimeException("Went beyond the matrix");
	        this.row = row;
	        this.column = column;
	        
	            if(row < 0 || column < 0) throw new  RuntimeException("Went beyond the matrix");
	               array = new int[row][];
	               for (int i = 0; i < row; i++){ 
	                  array[i] = new int[column];
	               }
	               this.row = row;
	               this.column = column;
	               for (int i = 0; i<this.row; i++){
	                  for (int j = 0; j<this.column; j++){
	                  this.array[i][j] = 0 ;            
	                  }
	               }

	    }
	    
	    public Matrix (){
	    }
	    
	    public  Matrix sum (Matrix a){
	    	Matrix c = new Matrix(this.row, this.column);
	        if ((this.row != a.row) ||(this.column != a.column)) throw new  SumMatrixException("Multiplication is impossible!");
	        for (int i = 0; i<this.row; i++){
	            for (int j = 0; j<this.column; j++){
	             c.setElement(i,j,this.getElement(i,j)+a.getElement(i,j));
	            //  c.array[i][j] = this.array[i][j] + a.array[i][j]; 
	              System.out.println( c.getElement(i,j));
	            }
	        }
	        return c; 
	     }
	     public Matrix product(Matrix a){
	    	 Matrix c = new Matrix(this.row, this.column);
	         if (this.column != a.row) throw new  ProductMatrixException("Multiplication is impossible!");
	         for(int i = 0; i < this.row; i++){
	             for(int j = 0; j < a.column; j++){
	                for(int k = 0; k < this.column; k++)
	                c.setElement(i,j,c.getElement(i,j)+this.getElement(i,k)*a.getElement(k,j));
	                   //c.array[i][j] += (this.array[i][k] * a.array[k][j]);
	             }
	          }
	          return c;
	    }
	     

	     
	     public void setElement(int row, int column, int value){
	         if((row < 0 || column < 0) && (row > this.row)||(column > this.row)) throw new  RuntimeException("Went beyond the matrix!");
		 this.array[row][column] = value;
	     }

	     public int getElement(int row, int column){
		 if((row < 0 || column < 0) && (row > this.row)||(column > this.row)) throw new  RuntimeException("Went beyond the matrix!");
	         return array[row][column];
	     }
	     
	     public String toString(){
	         StringBuffer strBuffer = new StringBuffer();
	         for(int i = 0; i < this.row; i++){
	             for(int j = 0; j < this.column; j++){
		         strBuffer.append(this.getElement(i,j));
		         strBuffer.append(" ");
	             }
	         strBuffer.append("\n");
	        }
	        return strBuffer.toString();  
	     }       
	     
	     public boolean equals ( Object o ) {
	    	 if(this.hashCode() != o.hashCode())
	 			return false;
	    	 if ( o instanceof Matrix ) {
	    		 Matrix a = (Matrix)o;
	    		 if ((this.row != a.row) ||(this.column != a.column) ) {
	    			 return false;   
	    		 }
	    		 for (int i = 0; i<this.row; i++){
	    	           for (int j = 0; j<this.column; j++){
	    	             if (this.getElement(i,j) != a.getElement(i,j)){
	    	                return false;
	    	             }            
	    	           }
	    	        }
	    		 return true;
	    	 }
	    	 else 
	    		 return false;
	     }
	}