ex8_39.txt

j2ee core design patterns

Example 8.39 	EmployeeImpl Class
// EmployeeImpl.java

package com.corej2eepatterns.business.impl;

import com.corej2eepatterns.business.hr.Department;
import com.corej2eepatterns.business.hr.Project;
import com.corej2eepatterns.business.hr.Employee;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

/**
 * @author  Craig Russell
 */
public class EmployeeImpl implements Employee {
	private long id;
	private String firstName;
	private String lastName;
	private DepartmentImpl department;
	private Set projects = new HashSet();

	/** Creates a new instance of EmployeeImpl */
	EmployeeImpl(long id, String firstName, String lastName) {
		this.id = id;
		this.firstName = firstName;
		this.lastName = lastName;
	}

	public boolean addProject(Project project) {
		boolean result = projects.add(project);
		if (result) {
			((ProjectImpl) project).addEmployee(this);
		}
		return result;
	}

	public boolean removeProject(Project project) {
		boolean result = projects.remove(project);
		if (result) {
			((ProjectImpl) project).removeEmployee(this);
		}
		return result;
	}

	public Department getDepartment() {
		return department;
	}

	public void setDepartment(Department department) {
		if (this.department != null) {
			this.department.removeEmployee(this);
		}
		this.department = (DepartmentImpl) department;
		this.department.addEmployee(this);
	}

	. . .

	public Set getProjects() {
		return Collections.unmodifiableSet(projects);
	}
}