@Entity
@Table ( name = "payments" )
@Cache ( usage = CacheConcurrencyStrategy.READ_WRITE)
public class Payment implements Serializable{

   
   private PaymentPK paymentPK;
   private Date paymentdate;
   private BigDecimal amount;
   /**
    * @return the paymentPK
    */
   @Id
   public PaymentPK getPaymentPK() {
      return paymentPK;
   }
   /**
    * @param paymentPK the paymentPK to set
    */
   public void setPaymentPK(PaymentPK paymentPK) {
      this.paymentPK = paymentPK;
   }
   /**
    * @return the paymentdate
    */
   @Column ( name = "paymentdate" )
   public Date getPaymentdate() {
      return paymentdate;
   }
   /**
    * @param paymentdate the paymentdate to set
    */
   public void setPaymentdate(Date paymentdate) {
      this.paymentdate = paymentdate;
   }
   /**
    * @return the amount
    */
   @Min (0)//es darf kein negativer betrag gebucht werden
   @Column ( name = "amount" )
   public BigDecimal getAmount() {
      return amount;
   }
   /**
    * @param amount the amount to set
    */
   public void setAmount(BigDecimal amount) {
      this.amount = amount;
   }
   /* (non-Javadoc)
    * @see java.lang.Object#hashCode()
    */
   @Override
   public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result
            + ((paymentPK == null) ? 0 : paymentPK.hashCode());
      return result;
   }
   /* (non-Javadoc)
    * @see java.lang.Object#equals(java.lang.Object)
    */
   @Override
   public boolean equals(Object obj) {
      if (this == obj)
         return true;
      if (obj == null)
         return false;
      if (!(obj instanceof Payment))
         return false;
      final Payment other = (Payment) obj;
      if (paymentPK == null) {
         if (other.paymentPK != null)
            return false;
      } else if (!paymentPK.equals(other.paymentPK))
         return false;
      return true;
   }

@Entity
@Table ( name="customers" )
@Cache ( usage = CacheConcurrencyStrategy.READ_WRITE )
public class Customer implements Serializable{
   /* Spalten der Tabelle als Attribute */
   
   /** Erste Adresszeile*/
   private String addresslineOne;
   /** Zweite Adresszeile */
   private String addresslineTwo;
   /** Stadt */
   private String city;
   /** Vorname des Kontaktes */
   private String contactfirstname;
   /** Nachname des Kontaktes */
   private String contactlastname;
   /** Bundesland des Kunden */
   private String country;
   /** Kreditrahmen des Kunden */
   private BigDecimal creditlimit;
   /** Name des Kunden */
   private String customername;
   /** Datenbank Primärschlüssel, Kundennummer */
   private Integer customernumber;
   /** Telefonnummer des Kunden */
   private String phone;
   /** Postleitzahl des Kunden */
   private String postalcode;
   /** Betreuender Verkäufer des Kunden */
   private Employee salesRep;
   /** Staat des Kunden */
   private String state;
   /** Ein Set von allen Bezahlungen die für den Kunden bereits in der DB hinterlegt sind. */
   private Set<Payment> payments;
   
   @Length ( max = 50)
   @Column ( name="addressline1" )
   public String getAddresslineOne() {
      return addresslineOne;
   }
   
   public void setAddresslineOne(String addresslineOne) {
      this.addresslineOne = addresslineOne;
   }
   
   @Basic ( optional = true )
   @Length ( max = 50)
   @Column ( name="addressline2" )
   public String getAddresslineTwo() {
      return addresslineTwo;
   }
   
   public void setAddresslineTwo(String addresslineTwo) {
      this.addresslineTwo = addresslineTwo;
   }
   
   @Length ( max = 50 )
   @Column ( name="city" )
   public String getCity() {
      return city;
   }
   
   public void setCity(String city) {
      this.city = city;
   }
   
   @Length ( max = 50 )
   @Column ( name = "contactfirstname" )
   public String getContactfirstname() {
      return contactfirstname;
   }
   
   public void setContactfirstname(String contactfirstname) {
      this.contactfirstname = contactfirstname;
   }
   
   @Length ( max = 50 )
   @Column ( name = "contactlastname" )
   public String getContactlastname() {
      return contactlastname;
   }
   
   public void setContactlastname(String contactlastname) {
      this.contactlastname = contactlastname;
   }
   
   @Length ( max = 50 )
   @Column ( name = "country" )
   public String getCountry() {
      return country;
   }
   
   public void setCountry(String country) {
      this.country = country;
   }
   
   @Basic ( optional = true )
   @Column ( name = "creditlimit" )
   public BigDecimal getCreditlimit() {
      return creditlimit;
   }
   
   public void setCreditlimit(BigDecimal creditlimit) {
      this.creditlimit = creditlimit;
   }
   
   @Length ( max = 50 )
   @Column ( name = "customername" )
   public String getCustomername() {
      return customername;
   }
   
   public void setCustomername(String customername) {
      this.customername = customername;
   }
   
   @Id
   @Column ( name = "customernumber" )
   public Integer getCustomernumber() {
      return customernumber;
   }
   
   public void setCustomernumber(Integer customernumber) {
      this.customernumber = customernumber;
   }
   
   @Length ( max = 50 )
   @Column ( name = "phone" )
   public String getPhone() {
      return phone;
   }
   
   public void setPhone(String phone) {
      this.phone = phone;
   }
   
   @Basic ( optional = true )
   @Length ( max = 15 )
   @Column ( name = "postalcode" )
   public String getPostalcode() {
      return postalcode;
   }
   
   public void setPostalcode(String postalcode) {
      this.postalcode = postalcode;
   }
   
   @ManyToOne ( optional = true, targetEntity = Employee.class)
   @JoinColumn ( name = "salesrepemployeenumber" )
   public Employee getSalesRep() {
      return salesRep;
   }
   
   public void setSalesRep(Employee salesRepEmployee) {
      this.salesRep = salesRepEmployee;
   }
   
   @Basic ( optional = true )
   @Length ( max = 50 )
   @Column ( name = "state" )
   public String getState() {
      return state;
   }
   
   public void setState(String state) {
      this.state = state;
   }
   
   /**
    * @return the payments
    */
   @OneToMany ( targetEntity = Payment.class, fetch = FetchType.LAZY)
   @Cascade ( {org.hibernate.annotations.CascadeType.SAVE_UPDATE,
        org.hibernate.annotations.CascadeType.DELETE_ORPHAN} )
   @JoinColumn ( name = "customernumber" )
   @OnDelete ( action = OnDeleteAction.CASCADE )
   public Set<Payment> getPayments() {
      return payments;
   }

   /**
    * @param payments the payments to set
    */
   public void setPayments(Set<Payment> payments) {
      this.payments = payments;
   }

   /**
    * Die überschriebene Methode nutzt zur hashCode-Berechnung die <code>customernumber</code> (PK der Datenbank), sowie
    * den <code>customername</code>
    */
   @Override
   public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result
            + ((customername == null) ? 0 : customername.hashCode());
      result = prime * result
            + ((customernumber == null) ? 0 : customernumber.hashCode());
      return result;
   }

   /**
    * Die überschriebene equals-Methode vergleicht die Objekte zunächst danach ob es sich um eine Instanz der
    * gleichen Klasse handelt. Im Anschluss werden die <code>customernumber</code> und falls diese nicht vorhanden sein sollte der
    * <code>customername</code> verglichen
    */
   @Override
   public boolean equals(Object obj) {
      if (this == obj)
         return true;
      if (obj == null)
         return false;
      if (!(obj instanceof Customer))
         return false;
      final Customer other = (Customer) obj;
      if (customernumber == null) {
         if (other.customernumber != null)
            return false;
      } else if (!customernumber.equals(other.customernumber))
         return false;
      if (customername == null) {
         if (other.customername != null)
            return false;
      } else if (!customername.equals(other.customername))
         return false;
      
      return true;
   }
   
   
   
   /**
    * Die überschriebene toString-Methode gibt die Customernumber und den Customername aus
    */
   @Override
   public String toString(){
      return "ID: "+customernumber+"    Name: "+customername;
   }
}

@Embeddable
public class PaymentPK implements Serializable{

   private Customer customer;
   private String checknumber;
   
   
   /**
    * @return the customer
    */
   @ManyToOne ( targetEntity = Customer.class)
   @JoinColumn ( name = "customernumber" )
   public Customer getCustomer() {
      return customer;
   }
   /**
    * @param customer the customer to set
    */
   public void setCustomer(Customer customer) {
      this.customer = customer;
   }
   /**
    * @return the checknumber
    */
   @Length ( max = 50 )
   @Column ( name = "checknumber" )
   public String getChecknumber() {
      return checknumber;
   }
   /**
    * @param checknumber the checknumber to set
    */
   public void setChecknumber(String checknumber) {
      this.checknumber = checknumber;
   }
   /* (non-Javadoc)
    * @see java.lang.Object#hashCode()
    */
   @Override
   public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result
            + ((checknumber == null) ? 0 : checknumber.hashCode());
      result = prime * result
            + ((customer == null) ? 0 : customer.hashCode());
      return result;
   }
   /* (non-Javadoc)
    * @see java.lang.Object#equals(java.lang.Object)
    */
   @Override
   public boolean equals(Object obj) {
      if (this == obj)
         return true;
      if (obj == null)
         return false;
      if (!(obj instanceof PaymentPK))
         return false;
      final PaymentPK other = (PaymentPK) obj;
      if (checknumber == null) {
         if (other.checknumber != null)
            return false;
      } else if (!checknumber.equals(other.checknumber))
         return false;
      if (customer == null) {
         if (other.customer != null)
            return false;
      } else if (!customer.equals(other.customer))
         return false;
      return true;
   }
   
   
}