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Exceptional Phone Numbers

PhoneNumberFactory

• Purpose - to demonstrate basic exception handling and logging.

• Objective - to implement a PhoneNumberFactory class that generates PhoneNumber objects.

• The PhoneNumber class is a container for a String representation of a respective phone number.

• Note: Phone numbers are a composite of 3 affixes; Area Code, Central Office Code, and Phone Line Code.

  • Area Code - the first 3 numeric values
  • Central Office Code - the 4th, 5th, and 6th numeric values.
  • Phone Line Code - the last 4 numeric values.

• Below is a sample instantation of and invokation on PhoneNumber.

String stringRepresentation = "(302)-312-5555";
PhoneNumber phoneNumber = new PhoneNumber(stringRepresentation);
String areaCode = phoneNumber.getAreaCode();
String centralOfficeCode = phoneNumber.getCentralOfficeCode();
String phoneLineCode = phoneNumber.getPhoneLineCode();

Part 1; Modify createPhoneNumber

• Upon instantiating a new PhoneNumber object, it is possible to receive a InvalidPhoneNumberFormatException if the String passed into the PhoneNumber constructor does not fit the format (###)-###-####.
  
• InvalidPhoneNumberFormatException extends IOException, which is a checked exception.
  
• Modify the createPhoneNumber method so that it throws any resulting InvalidPhoneNumberFormatException.
  • This will ensure that any method calling createPhoneNumber will have to handle the exception.

Part 2; Implement createPhoneNumberSafely

• Using the createPhoneNumber method from Part 1, define the createPhoneNumberSafely method such that the input parameters, areaCode, centralOfficeCode, phoneLineCode are concatenated to create a String representation of the respective phone number.
• Use this String object to construct a new instance of PhoneNumber and return it.
• If the concatentation of the input parameters yields a String whose value does not match the format (###)-###-####, then our PhoneNumber will throw a InvalidPhoneNumberFormatException.
• If a InvalidPhoneNumberFormatException is thrown within this method, catch it and return null.

Part 3; Implement createRandomPhoneNumber

• Using the RandomNumberFactory, generate a random Area Code, Central Office Code, and Phone Line Code. Pass these values as arguments of the createPhoneNumberSafely method from Part 2 and return the resulting PhoneNumber object.

Part 4; Implement createRandomPhoneNumberArray

• Using the createRandomPhoneNumber from Part 3, generate an array of PhoneNumber objects, whose length reflects the input argument.
  • For example createRandomPhoneNumber(5) should return an array of 5 PhoneNumber objects.

Part 5; Add logging

• Add logging to the createPhoneNumber method from Part 1, which logs the message

  • "Attempting to create a new PhoneNumber object with a value of (###)-###-####
  • where (###)-###-#### will be replaced with the respective input parameter.

• Add logging to the createPhoneNumberSafely method from Part 2, which logs the message

  • (###)-###-#### is not a valid phone number
  • Where (###)-###-#### will be replaced with the respective input parameter.

Part 6; Ensure all test cases pass

• Yeah this header says all that is needed...