init commit

contacts/Phone.cs

@@ -0,0 +1,60 @@
+using System;
+
+/// <summary>
+/// Represents a phone number for a contact. Contains methods to determine if two phone numbers are the same.
+/// </summary>
+namespace Contacts
+{
+    public class Phone : IEquatable<Phone>
+    {
+        public string number { get; }
+        public PhoneType? Type { get; }
+
+        /// <summary>
+        /// Accepts an input string in the format "1234567890" to create a new Phone object for a Contacts.
+        /// </summary>
+        /// <param name="number"></param>
+        /// <param name="type">If null, defaults to "Other"</param>
+        /// <exception cref="ArgumentException">Thrown if input has an invalid format.</exception>
+        public Phone(string number, PhoneType? type)
+        {
+            if (number.Length != 10)
+                throw new ArgumentException("Input phone number should be in the format 1234567890.");
+
+            this.number = number;
+            this.Type = type;
+        }
+
+        /// <summary>
+        /// Determines if two phone numbers are equal, to avoid potential duplication.
+        /// </summary>
+        /// <param name="numberToCompare">Phone number to compare to. If null, returns false.</param>
+        /// <returns>Whether or not the two phone numbers are the same.</returns>
+        public bool Equals(Phone? numberToCompare)
+        {
+            if (numberToCompare == null)
+                return false;
+
+            return this.ToString().Equals(numberToCompare.ToString());
+        }
+
+
+        /// <summary>
+        /// Returns the phone number without any formatting, for use in saving contacts to a file.
+        /// </summary>
+        /// <returns>Unformatted phone number</returns>
+        public string DisplayString()
+        {
+            return number;
+        }
+
+        /// <summary>
+        /// Formats the phone number to "(123) 456 - 7890"
+        /// </summary>
+        /// <returns>Formatted phone number</returns>
+        public override string ToString()
+        {
+            return "(" + number.Substring(0, 3) + ") " + number.Substring(3, 3) + " - " + number.Substring(6);
+        }
+    }
+}