gistfile1.txt

import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.Enumerated;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

/**
 * @author Strong Liu
 */
@Entity
public class Cat {
    @Id
    @GeneratedValue
    private Long id; // identifier
    @Temporal( TemporalType.TIMESTAMP )
    private Date birthdate;
    @Enumerated
    private Color color;
    private char sex;
    private float weight;
    private int litterId;
    @OneToMany(mappedBy = "kittens")
    private Cat mother;
    @ManyToOne
    private Set<Cat> kittens = new HashSet<Cat>();

    private void setId(Long id) {
        this.id = id;
    }

    public Long getId() {
        return id;
    }

    void setBirthdate(Date date) {
        birthdate = date;
    }

    public Date getBirthdate() {
        return birthdate;
    }

    void setWeight(float weight) {
        this.weight = weight;
    }

    public float getWeight() {
        return weight;
    }

    public Color getColor() {
        return color;
    }

    void setColor(Color color) {
        this.color = color;
    }

    void setSex(char sex) {
        this.sex = sex;
    }

    public char getSex() {
        return sex;
    }

    void setLitterId(int id) {
        this.litterId = id;
    }

    public int getLitterId() {
        return litterId;
    }

    void setMother(Cat mother) {
        this.mother = mother;
    }

    public Cat getMother() {
        return mother;
    }

    void setKittens(Set<Cat> kittens) {
        this.kittens = kittens;
    }

    public Set<Cat> getKittens() {
        return kittens;
    }

    // addKitten not needed by Hibernate
    public void addKitten(Cat kitten) {
        kitten.setMother( this );
        kitten.setLitterId( kittens.size() );
        kittens.add( kitten );
    }
}


import javax.persistence.Entity;

/**
 * @author Strong Liu
 */
@Entity
public class DomesticCat extends Cat {
    private String name;

    public String getName() {
        return name;
    }

    protected void setName(String name) {
        this.name = name;
    }
}

/**
 * @author Strong Liu
 */
public enum Color {
    TABBY,BLACK,GINGER;
}