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source/Operation.java

@@ -0,0 +1,73 @@
+package serie04;
+
+import java.util.ArrayList;
+
+public class Operation {
+	private int[][] table;
+	private int size;
+	
+	public Operation(int size, int[][] table) {
+		if (size < 1) throw new NegativeArraySizeException();
+		this.size = size;
+		this.table = table;
+	}
+	
+	public int calculate(int indexA, int indexB) {
+		if(indexA >= this.size || indexB >= this.size)throw new IndexOutOfBoundsException();
+		return this.table[indexA][indexB];
+	}
+	
+	public boolean validateTable() {
+		
+		//validate rows and check closedness 
+		for(int i = 0; i < this.size; i++) {
+			ArrayList<Integer> used = new ArrayList<Integer>();
+			for(int j = 0; j < this.size; j++) {
+				if(this.table[i][j] >= this.size || this.table[i][j] < 0) return false;
+				if (isIn(this.table[i][j], used)) return false;
+				used.add(this.table[i][j]);
+			}
+		}
+		//validate columns
+		for(int j = 0; j < this.size; j++) {
+			ArrayList<Integer> used = new ArrayList<Integer>();
+			for(int i = 0; i < this.size; i++) {
+				if (isIn(this.table[i][j], used)) return false;
+				used.add(this.table[i][j]);
+			}
+		}
+		
+		return this.checkAssociativity();
+	}
+	
+	public boolean checkAssociativity() {
+		
+		for(int a = 0; a < this.size; a++) {
+			for(int b = 0; b < this.size; b++) {
+				for(int c = 0; c < this.size; c++) {
+					if (this.checkAssociativity(a, b, c) == false) return false;
+				}
+			}
+		}
+		
+		return true;
+	}
+	
+	public boolean checkAssociativity(int indexA, int indexB, int indexC) {
+		
+		return this.calculate(indexA, this.calculate(indexB, indexC)) == this.calculate(this.calculate(indexA, indexB), indexC);
+		
+	}
+	
+	private static boolean isIn(int a, ArrayList<Integer> array) {
+		for(int i = 0; i < array.size(); i++) {
+			if (a == array.get(i)) return true;
+		}
+		return false;
+	}
+	
+	public int getSize() {
+		return this.size;
+	}
+	
+}