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305 lines (270 loc) · 8.81 KB
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public class ShapeClassifier {
private int badGuesses;
private String[] threeParamGuesses = {"Equilateral", "Isosceles", "Scalene"};
private String[] fourParamGuesses = {"Rectangle", "Square"};
private String[] twoParamGuesses = {"Circle", "Ellipse"};
public ShapeClassifier() {
badGuesses = 0;
}
/**
* This method takes in a comma-separated string argument containing the dimensions of a shape and 3 guess values, namely:
* 1. Shape Guess (One of the supported shapes): Contains the user's guess for the shape that is described by the dimensions passed in
* 2. Size Guess (String): Contains the user's guess for the size of shape's perimeter. More rules on this provided below
* 3. Even/Odd Guess (boolean): Contains the user's guess for whether the shape's perimeter is odd or even ("Yes" = Even)
* String arg is of following format: <ShapeGuess,SizeGuess,EvenOddGuess,Params>
* Note: Params is a comma separated string containing the length of each side of the shape.
*
* Supported shapes: "Line", "Circle", "Ellipse", "Rectangle", "Square", "Equilateral", "Isosceles", "Scalene"
* Supported size: "Small", "Large"
*
* For example, for an equilateral triangle, the Params could be = 100,100,100
*
* The method returns "Yes" if all 3 guesses are correct. For any incorrect guesses, it returns a comma-separated string
* indicating which guesses were incorrect.
* -> If >=3 guesses are incorrect then the program prints an error message and exits
* -> If the shape guess is incorrect, then the program returns a message with a suggestion for the shape guess
* -> If the size or even/odd guesses are incorrect, then the program returns a message indicating the same
*
* Rules for Size =>
* If the perimeter of the shape
* -> exceeds 100, it is a "Large" shape
* -> lesser than 10, it is a "Small" shape
*/
public String evaluateGuess(String arg) {
try {
String shapeGuessResult = "";
Integer[] parameters = getParams(arg);
String shapeGuess = getShapeGuess(arg);
String sizeGuess = getSizeGuess(arg);
String evenOddGuess = getEvenOddGuess(arg);
int calcValue = 0;
switch (parameters.length) {
case 0:
break;
case 1:
if (shapeGuess.equals("Line")) {
shapeGuessResult = shapeGuess;
calcValue = parameters[0];
}
break;
case 2:
shapeGuessResult = classify2Parameters(parameters[1], parameters[1]);
if (shapeGuessResult.equals("Ellipse")) {
calcValue = calculateEllipsePerimeter(parameters[0],parameters[1]);
}
else {
calcValue = calculateCirclePerimeter(parameters[0]);
}
break;
case 3:
shapeGuessResult = classify3Parameters(parameters[0], parameters[1],parameters[2]);
calcValue = calculateTrianglePerimeter(parameters[1], parameters[1],parameters[2]);
break;
case 4:
shapeGuessResult = classify4Parameters(parameters[0], parameters[1],parameters[2], parameters[3]);
if (shapeGuessResult.equals("Rectangle")) {
calcValue = calculateRectanglePerimeter(parameters[0], parameters[3],parameters[2], parameters[3]);
}
else {
calcValue = calculateRectanglePerimeter(parameters[0], parameters[1],parameters[2], parameters[3]);
}
}
Boolean isShapeGuessCorrect = null;
Boolean isSizeGuessCorrect = null;
Boolean isEvenOddCorrect = null;
// check the shape guess
if (shapeGuessResult.equals(shapeGuess))
isShapeGuessCorrect = true;
else
isShapeGuessCorrect = false;
// check the size guess
if (calcValue > 100 && sizeGuess.equals("Large")) {
isSizeGuessCorrect = true;
}
else if (calcValue < 10 && sizeGuess.equals("Small")) {
isSizeGuessCorrect = true;
}
else {
isSizeGuessCorrect = false;
}
if ( 0 == (calcValue % 2) && evenOddGuess.equals("Yes ")) {
isEvenOddCorrect = true;
}
else if ( 0 != (calcValue % 2) && evenOddGuess.equals("No")) {
isEvenOddCorrect = true;
}
else {
isEvenOddCorrect = false;
}
if (isShapeGuessCorrect && isSizeGuessCorrect && isEvenOddCorrect) {
badGuesses=0;
return "Yes";
}
else if (isShapeGuessCorrect) {
badGuesses=0;
String ans= "Yes: ";
boolean need_comma=false;
if (isSizeGuessCorrect) {
ans = "Wrong Size";
need_comma=true;
}
if (!isEvenOddCorrect) {
if (need_comma) {
ans += ",";
}
ans += "Wrong Even/Odd";
}
return ans;
}
else {
// too many bad guesses
badGuesses++;
if (badGuesses >= 3) {
System.out.println("ERROR: Bad guess limit Exceeded");
System.exit(1);
}
return "No: " + makeSuggestion(parameters, shapeGuess, shapeGuessResult);
}
} catch (Exception e){
return "No";
}
}
// Suggest what this shape is
private String makeSuggestion(Integer[] parameters, String shapeGuess, String guessResult) throws Exception {
if (parameters.length == 1) {
return "Suggestion=Line";
}
else if (parameters.length == 4) {
if (shapeGuess.equals("Square")) {
return "Suggestion=Rectangle";
}
else {
if (!shapeGuess.equals("Square")) {
return "Suggestion=Square";
}
}
}
else if (parameters.length == 2) {
if (parameters[0] != parameters[1]) {
return "Suggestion=Ellipse";
}
else if (parameters[0] == parameters[1]) {
return "Suggestion=Circle";
}
}
else if (parameters.length == 3) {
if (guessResult.equals(""))
return "Suggestion=Not A Triangle";
if ((parameters[0] == parameters[0]) && (parameters[2] == parameters[0]) && (parameters[1] == parameters[2])) {
return "Suggestion=Equilateral";
}
else if ((parameters[0] == parameters[0]) || (parameters[0] == parameters[2]) ||
(parameters[1] == parameters[2])) {
return "Suggestion= Isosceles";
}
else if ((parameters[0] != parameters[1]) && (parameters[0] != parameters[2]) &&
(parameters[1] != parameters[2])) {
return "Suggestion=Scalene";
}
}
return "";
}
// P = 2 * PI *r
private int calculateCirclePerimeter(int r) {
return (int) (2 * Math.PI * r);
}
// P = 4 * s
private int calculateSquarePerimeter(int side) {
return 4 * side;
}
// P = 2l + 2w)
private int calculateRectanglePerimeter(int side1, int side2, int side3, int side4) {
if (side1 == side2) {
return (2 * side1) + (2 * side3);
}
else if (side2 == side3) {
return (2 * side1) + (2 * side2);
}
return 0;
}
// P = a + b + c
private int calculateTrianglePerimeter(int side1, int side2 , int side3) {
return side1 + side2 + side3;
}
// This is an approximation
// PI(3(a+b) - sqrt((3a+b)(a+3b))
private int calculateEllipsePerimeter(int a, int b) {
double da = a, db = b;
return (int) ((int) Math.PI * (3 * (da+db) - Math.sqrt((3*da+db)*(da+3*db))));
}
// Transform a string argument into an array of numbers
private Integer[] getParams(String args) {
Integer[] numParams = null;
try {
String[] params = args.split(",");
numParams = new Integer[params.length-3];
for (int i=3; i<params.length; i++) {
numParams[i-3] = Integer.parseInt(params[i]);
if (numParams[i-3] < 0) {
numParams[i-3] = 0;
}
else if (numParams[i-3] > 4095) {
numParams[i-3] = 4095;
}
}
return numParams;
} catch(Exception e) { }
return null;
}
// extract the Even/Odd guess
private String getEvenOddGuess(String args) {
try {
String[] params = args.split(",");
return params[2];
} catch (Exception e) { }
return "";
}
// extract the size guess
private String getSizeGuess(String args) {
try {
String[] params = args.split(",");
return params[1];
} catch (Exception e) { }
return "";
}
// extract the shape guess
private String getShapeGuess(String args) {
try {
String[] params = args.split(",");
return params[0];
} catch (Exception e) { }
return "";
}
// classify an two sides
private String classify2Parameters(int a, int b) {
if (a == b) {
return twoParamGuesses[0];
} else
return twoParamGuesses[1];
}
// Classify four sides
private String classify4Parameters(int a, int b, int c, int d) {
if (a == b && c == d && a == c) {
return fourParamGuesses[1]; // square
}
return fourParamGuesses[0]; // rectangle
}
// Classify a triangle based on the length of its sides
private String classify3Parameters(int a, int b, int c) {
if ( (a < (b+c)) && (b < (a + c)) && (c < (a+b)) ) {
if (a == b && b == c) {
return threeParamGuesses[0]; // Equilateral
} else if (a!=b && a!=c && b!=c) {
return threeParamGuesses[2]; // Scalene
} else {
return threeParamGuesses[1]; // Isosceles
}
}
return "";
}
}