EmployeeProcessor

You are given a collection containing Employee objects. You will need to compare these objects to an object from an input stream as described below.

Given class: EmployeePayroll

Contains a collection of employees and a stream that contains a test Employee. A description of your task follows the class definition.

class EmployeePayroll {

    /** 
     * Instantiates the payroll by using the appropriate ID given to you.
     *
     * @param employeeCollectionID The ID of the Payroll to load.
     */
    public EmployeePayroll(int employeeCollectionID);

    /**
     * Returns the Employee objects listed in this payroll.
     * See the Employee class.
     *
     * @return A collection of 5 to 125 Employee objects, inclusive.
     */
    public Collection<Employee> getCollection();

    /**
     * Gets a Stream containing the Employee object compare against the collection.
     *
     * @return An ObjectInputStream with the first object guaranteed to be an Employee.
     * @throws IllegalStateException if the stream is currently unavailable, call again
     *                               until no exception is thrown
     */
    public ObjectInputStream getStream();

}

Given class: Employee

Represents Employee. The Employee class has properties and methods that are not shown here, including appropriate Object overrides. Note that employees with identical names are not necessarily equal.

class Employee implements Serializable {

    /**
     * Gets the name of the employee. Note: do not rely on the name
     * to determine whether two Employee objects are equal.
     *
     * @return a name consisting of eight characters in the range 'a' to 'z' (lowercase letters)
     */
    public String getName();
}

DEFINITION

You must define a public class EmployeeProcessor with public method String collisionNames(int employeeCollectionID, int hashSize). employeeCollectionID is between 0 and 65535, inclusive. hashSize is between 10 and 50, inclusive.

Implement collisionNames as follows:

Instantiate the provided EmployeePayroll class by passing employeeCollectionID to EmployeePayroll(int). Call getCollection() on the resulting object to obtain a collection of Employee objects.

Use getStream() to obtain an ObjectInputStream. The first object in the stream will be an instance of the Employee class. Read this object and compare it to the objects in the collection.

Call getName() on each Employee from the collection that is not equal to the Employee from the stream, but that has the same hash code modulo hashSize.

Return a String containing all the unique names. This string must be sorted alphabetically and separated by commas.