Java, immutability and builders - PersonBuilder.java

gistfile1.java

package com.pelssers.domain;


public class PersonBuilder {

	private String firstName;
	private String lastName;
	
	/**
	 * @param person the source person
	 * @return a new personbuilder object with all properties from person copied
	 */
	public static PersonBuilder from(Person person) {
		return 
		    new PersonBuilder()
	       .withFirstName(person.getFirstName())
	       .withLastName(person.getLastName());
	}
	
	public Person build() {
		Person person = new Person();
		person.setFirstName(firstName);
		person.setLastName(lastName);
		return person;
	}
	
	public PersonBuilder withFirstName(String firstName) {
		this.firstName = firstName;
		return this;
	}
	
	public PersonBuilder withLastName(String lastName) {
		this.lastName = lastName;
		return this;
	}

}