feat: update structure
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222
cs2030s/labs/Lab5/Lab5.java
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222
cs2030s/labs/Lab5/Lab5.java
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import cs2030s.fp.Action;
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import cs2030s.fp.Actually;
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import cs2030s.fp.Constant;
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import cs2030s.fp.Immutator;
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import cs2030s.fp.Transformer;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Scanner;
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class Lab5 {
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public static String getGrade(String module, String student, String assessment,
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Map<String, Map<String, Map<String, String>>> db) {
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Constant<Actually<Map<String, Map<String, Map<String, String>>>>> constantDb = () -> Actually.ok(db);
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Constant<String> constantNoEntry = () -> "No such entry";
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Immutator<Actually<Map<String, Map<String, String>>>, Map<String, Map<String, Map<String, String>>>> getModule = param -> Actually
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.ok(param.get(module));
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Immutator<Actually<Map<String, String>>, Map<String, Map<String, String>>> getStudent = param -> Actually
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.ok(param.get(student));
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Immutator<Actually<String>, Map<String, String>> getAssessment = param -> Actually
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.ok(param.get(assessment).toString());
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return constantDb.init().next(getModule).next(getStudent).next(getAssessment).except(constantNoEntry);
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}
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public static void main(String[] args) {
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// Create a scanner to read from standard input.
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Scanner sc = new Scanner(System.in);
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// Read a single integer from the test file
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// and then run the appropriate test case
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switch (sc.nextInt()) {
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case 1:
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test1();
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break;
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case 2:
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test2();
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break;
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case 3:
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test3();
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break;
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case 4:
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test4();
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break;
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case 5:
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test5();
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break;
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case 6:
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test6();
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break;
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}
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}
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public static void test1() {
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String none = null;
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System.out.println(Actually.err(new ArithmeticException("Err")).equals(Actually.err(new Exception("Err"))));
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System.out.println(Actually.err(new ArithmeticException("Err")).equals(Actually.err(new Exception("Error"))));
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System.out.println(Actually.err(new ArithmeticException("Err")).equals(Actually.err(new Exception(none))));
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System.out.println(Actually.err(new ArithmeticException(none)).equals(Actually.err(new Exception(none))));
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System.out.println(Actually.err(new ArithmeticException("Err")).equals(Actually.ok("Err")));
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System.out.println(Actually.ok("Err").equals(Actually.ok("Err")));
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System.out.println(Actually.ok("Err").equals(Actually.err(new Exception("Error"))));
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System.out.println(Actually.ok("Err").equals("Err"));
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System.out.println(Actually.ok(null).equals(Actually.ok("Err")));
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System.out.println(Actually.ok(null).equals(Actually.ok(null)));
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System.out.println(Actually.ok(null).equals("Err"));
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System.out.println(Actually.ok(null).equals(null));
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}
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public static void test2() {
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Constant<Integer> zero = new Constant<>() {
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public Integer init() {
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return 0;
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}
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};
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Action<Integer> print = new Action<>() {
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public void call(Integer i) {
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System.out.println(i);
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}
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};
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try {
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Actually.<Number>ok(0).unwrap().toString();
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} catch (Exception e) {
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System.out.println(e.getMessage());
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}
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Actually.<Integer>ok(9).finish(print);
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Actually.<Integer>err(new Exception("Err")).finish(print);
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System.out.println(Actually.<Number>ok(9).except(zero).toString());
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System.out.println(Actually.<Number>err(new ArithmeticException("div by 0")).except(zero).toString());
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System.out.println(Actually.<Number>err(new ArithmeticException("div by 0")).unless(4).toString());
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System.out.println(Actually.<Number>ok(0).unless(4).toString());
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}
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public static void test3() {
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Immutator<Integer, Integer> inc = new Immutator<>() {
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public Integer invoke(Integer p) {
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return p + 1;
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}
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};
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Immutator<Integer, Integer> inv = new Immutator<>() {
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public Integer invoke(Integer p) {
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return 1 / p;
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}
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};
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Immutator<Number, Integer> incNum = new Immutator<>() {
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public Number invoke(Integer p) {
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return p + 1;
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}
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};
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Immutator<Number, Integer> invNum = new Immutator<>() {
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public Number invoke(Integer p) {
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return 1 / p;
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}
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};
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System.out.println(Actually.<Integer>ok(0).transform(inc).toString());
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System.out.println(Actually.<Integer>ok(0).transform(inv).toString());
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System.out.println(Actually.ok(0).transform(inc).toString());
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System.out.println(Actually.ok(0).transform(inv).toString());
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System.out.println(Actually.<Integer>ok(0).transform(incNum).toString());
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System.out.println(Actually.<Integer>ok(0).transform(invNum).toString());
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System.out.println(Actually.ok(0).transform(incNum).toString());
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System.out.println(Actually.ok(0).transform(invNum).toString());
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}
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public static void test4() {
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Transformer<Integer, Integer> inc = new Transformer<>() {
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public Integer invoke(Integer p) {
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return p + 1;
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}
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};
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Transformer<Integer, Integer> sqr = new Transformer<>() {
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public Integer invoke(Integer p) {
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return p * p;
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}
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};
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Transformer<Integer, Integer> sqrPlusOneA = sqr.before(inc);
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Transformer<Integer, Integer> sqrPlusOneB = inc.after(sqr);
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Transformer<Integer, Integer> plusOneSqrA = sqr.after(inc);
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Transformer<Integer, Integer> plusOneSqrB = inc.before(sqr);
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System.out.println(sqrPlusOneA.invoke(2).toString());
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System.out.println(sqrPlusOneA.invoke(2).toString());
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System.out.println(plusOneSqrA.invoke(2).toString());
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System.out.println(plusOneSqrB.invoke(2).toString());
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}
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public static void test5() {
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Immutator<Actually<Integer>, Integer> half = new Immutator<>() {
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public Actually<Integer> invoke(Integer p) {
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if (p % 2 == 0) {
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return Actually.<Integer>ok(p / 2);
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} else {
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return Actually.<Integer>err(new Exception("odd number"));
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}
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}
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};
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Immutator<Actually<Integer>, Integer> inc = new Immutator<>() {
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public Actually<Integer> invoke(Integer p) {
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return Actually.<Integer>ok(p + 1);
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}
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};
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Immutator<Actually<Integer>, Integer> make = new Immutator<>() {
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public Actually<Integer> invoke(Integer p) {
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return Actually.<Integer>ok(p);
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}
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};
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Constant<Integer> zero = new Constant<>() {
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public Integer init() {
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return 0;
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}
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};
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System.out.println(make.invoke(0).next(inc).next(inc).next(half).toString());
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System.out.println(make.invoke(0).next(inc).next(half).next(inc).toString());
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System.out.println(make.invoke(0).next(inc).next(inc).next(half).except(zero).toString());
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System.out.println(make.invoke(0).next(inc).next(half).next(inc).except(zero).toString());
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}
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public static void test6() {
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Map<String, Map<String, Map<String, String>>> nus = Map.of(
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"CS2030S", Map.of(
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"Steve", Map.of(
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"lab1", "A",
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"lab2", "A-",
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"lab3", "A+",
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"lab4", "B",
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"pe1", "C"),
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"Tony", Map.of(
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"lab1", "C",
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"lab2", "C",
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"lab3", "B-",
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"lab4", "B+",
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"pe1", "A")),
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"CS2040S", Map.of(
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"Steve", Map.of(
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"lab1", "A",
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"lab2", "A+",
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"lab3", "A+",
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"lab4", "A",
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"midterm", "A+")));
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System.out.println(getGrade("CS2030S", "Steve", "lab1", nus));
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System.out.println(getGrade("CS2030S", "Steve", "lab2", nus));
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System.out.println(getGrade("CS2040S", "Steve", "lab3", nus));
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System.out.println(getGrade("CS2040S", "Steve", "lab4", nus));
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System.out.println(getGrade("CS2030S", "Tony", "lab1", nus));
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System.out.println(getGrade("CS2030S", "Tony", "midterm", nus));
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System.out.println(getGrade("CS2040S", "Tony", "lab4", nus));
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System.out.println(getGrade("CS2040S", "Bruce", "lab4", nus));
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}
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}
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