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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
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 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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package javax.persistence;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Designates a class whose mapping information is applied 
 * to the entities that inherit from it. A mapped superclass 
 * has no separate table defined for it.  
 *
 * 

A class designated with the MappedSuperclass * annotation can be mapped in the same way as an entity except that the * mappings will apply only to its subclasses since no table * exists for the mapped superclass itself. When applied to the * subclasses the inherited mappings will apply in the context * of the subclass tables. Mapping information may be overridden * in such subclasses by using the {@link AttributeOverride} and * {@link AssociationOverride} annotations or corresponding XML elements. * *

 *    Example: Concrete class as a mapped superclass
 *
 *    @MappedSuperclass
 *    public class Employee {
 *    
 *        @Id protected Integer empId;
 *        @Version protected Integer version;
 *        @ManyToOne @JoinColumn(name="ADDR")
 *        protected Address address;
 *    
 *        public Integer getEmpId() { ... }
 *        public void setEmpId(Integer id) { ... }
 *        public Address getAddress() { ... }
 *        public void setAddress(Address addr) { ... }
 *    }
 *    
 *    // Default table is FTEMPLOYEE table
 *    @Entity
 *    public class FTEmployee extends Employee {
 *    
 *        // Inherited empId field mapped to FTEMPLOYEE.EMPID
 *        // Inherited version field mapped to FTEMPLOYEE.VERSION
 *        // Inherited address field mapped to FTEMPLOYEE.ADDR fk
 *        
 *    
 *    // Defaults to FTEMPLOYEE.SALARY
 *    
 *    protected Integer salary;
 *    
 *    
 *    public FTEmployee() {}
 *    
 *    
 *    public Integer getSalary() { ... }
 *    
 *    public void setSalary(Integer salary) { ... }
 *    }
 *    
 *    @Entity @Table(name="PT_EMP")
 *    @AssociationOverride(name="address", 
 *    
 *    
 *    joincolumns=@JoinColumn(name="ADDR_ID"))
 *    public class PartTimeEmployee extends Employee {
 *    
 *        // Inherited empId field mapped to PT_EMP.EMPID
 *        // Inherited version field mapped to PT_EMP.VERSION
 *        // address field mapping overridden to PT_EMP.ADDR_ID fk
 *        @Column(name="WAGE")
 *        protected Float hourlyWage;
 *    
 *        public PartTimeEmployee() {}
 *    
 *        public Float getHourlyWage() { ... }
 *        public void setHourlyWage(Float wage) { ... }
 *    }
 *
 *    Example: Non-entity superclass
 *
 *    public class Cart {
 *    
 *        // This state is transient
 *        Integer operationCount;
 *    
 *        public Cart() { operationCount = 0; }
 *        public Integer getOperationCount() { return operationCount; }
 *        public void incrementOperationCount() { operationCount++; }
 *    }
 *    
 *    @Entity
 *    public class ShoppingCart extends Cart {
 *    
 *        Collection items = new Vector();
 *    
 *        public ShoppingCart() { super(); }
 *    
 *    
 *    ...
 *    
 *        @OneToMany
 *        public Collection getItems() { return items; }
 *        public void addItem(Item item) {
 *            items.add(item);
 *            incrementOperationCount();
 *        }
 *    }
 * 
* * @since Java Persistence 1.0 */ @Target({TYPE}) @Retention(RUNTIME) public @interface MappedSuperclass { }




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