Add Faculty class

src/main/java/staffconnect/model/person/Faculty.java

@@ -0,0 +1,113 @@
+package staffconnect.model.person;
+
+import static java.util.Objects.requireNonNull;
+import static staffconnect.commons.util.AppUtil.checkArgument;
+
+import java.util.Arrays;
+
+/**
+ * Represents a Person's faculty in the staff book.
+ * Guarantees: immutable; is valid as declared in
+ * {@link #isValidFaculty(String)}
+ */
+public class Faculty {
+    public static final String MESSAGE_CONSTRAINTS =
+            "The content should be a String representing a real faculty of NUS";
+
+    /**
+     * For this version, a valid faculty value should match exactly the full name of the faculty,
+     * or the value is invalid. The enum class serves as the purpose for parsing user strings into the faculty name.
+     */
+    public enum FacultyName {
+        ARTS_AND_SOCIAL_SCIENCES("Arts and Social Sciences"),
+        BUSINESS("Business"),
+        COMPUTING("Computing"),
+        CONTINUING_AND_LIFELONG_EDUCATION("Continuing and Lifelong Education"),
+        DENTISTRY("Dentistry"),
+        DESIGN_AND_ENVIRONMENT("Design and Environment"),
+        DUKE_NUS_MEDICAL_SCHOOL("Duke-NUS Medical School"),
+        ENGINEERING("Engineering"),
+        INTEGRATIVE_SCIENCES_AND_ENGINEERING("Integrative Sciences and Engineering"),
+        LAW("Law"),
+        MEDICINE("Medicine"),
+        MUSIC("Music"),
+        PUBLIC_HEALTH("Public Health"),
+        PUBLIC_POLICY("Public Policy"),
+        SCIENCE("Science"),
+        UNIVERSITY_SCHOLARS_PROGRAMME("University Scholars Programme"),
+        YALE_NUS_COLLEGE("Yale-NUS College");
+
+        private final String facultyNameValue;
+
+        FacultyName(String facultyName) {
+            this.facultyNameValue = facultyName;
+        }
+
+        /**
+         * Links enum member to its name.
+         *
+         * @return name of the faculty
+         */
+        public String getFacultyName() {
+            return facultyNameValue;
+        }
+    }
+    public final FacultyName value;
+
+    /**
+     * Constructs a {@code Faculty}.
+     *
+     * @param faculty A valid faculty.
+     */
+    public Faculty(String faculty) {
+        requireNonNull(faculty);
+        checkArgument(isValidFaculty(faculty), MESSAGE_CONSTRAINTS);
+        value = fromString(faculty); // can be extended
+    }
+
+    /**
+     * Verifies if a faculty name is valid.
+     *
+     * @param test string representing the faculty name
+     * @return True if the input matches any faculty name.
+     */
+    public static boolean isValidFaculty(String test) {
+        requireNonNull(test, "faculty cannot be null");
+
+        return Arrays.stream(FacultyName.values())
+                .anyMatch(faculty -> faculty.getFacultyName().equalsIgnoreCase(test));
+    }
+
+    private static FacultyName fromString(String name) {
+        for (FacultyName faculty : FacultyName.values()) {
+            if (faculty.getFacultyName().equalsIgnoreCase(name)) {
+                return faculty;
+            }
+        }
+        throw new IllegalArgumentException("No enum constant matches the provided name: " + name);
+    }
+
+    @Override
+    public String toString() {
+        return value.getFacultyName();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+
+        if (!(obj instanceof Faculty)) {
+            return false;
+        }
+
+        Faculty otherFaculty = (Faculty) obj;
+        return this.value.equals(otherFaculty.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return value.hashCode();
+    }
+}

src/test/java/staffconnect/model/person/FacultyTest.java

@@ -0,0 +1,57 @@
+package staffconnect.model.person;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static staffconnect.testutil.Assert.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+public class FacultyTest {
+    @Test
+    public void constructor_null_throwsNullPointerException() {
+        assertThrows(NullPointerException.class, () -> new Faculty(null));
+    }
+
+    @Test
+    public void constructor_invalidFaculty_throwsIllegalArgumentException() {
+        String invalidFaculty = "";
+        assertThrows(IllegalArgumentException.class, () -> new Faculty(invalidFaculty));
+    }
+
+    @Test
+    public void isValidFaculty() {
+        // null Faculty
+        assertThrows(NullPointerException.class, () -> Faculty.isValidFaculty(null));
+
+        // invalid faculties
+        assertFalse(Faculty.isValidFaculty("")); // empty string
+        assertFalse(Faculty.isValidFaculty(" ")); // spaces only
+
+        // valid Faculties
+        assertTrue(Faculty.isValidFaculty("science")); // ignore capitals
+        assertTrue(Faculty.isValidFaculty("Computing"));
+        assertTrue(Faculty.isValidFaculty("Arts and Social Sciences")); // long faculty
+    }
+
+    @Test
+    public void equals() {
+        Faculty faculty = new Faculty("Computing");
+
+        // same values -> returns true
+        assertEquals(faculty, new Faculty("Computing"));
+
+        // same object -> returns true
+        assertEquals(faculty, faculty);
+
+        // null -> returns false
+        assertNotEquals(null, faculty);
+
+        // different types -> returns false
+        assertFalse(faculty.equals(5.0f));
+
+        // different values -> returns false
+        assertNotEquals(faculty, new Faculty("Science"));
+    }
+}