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package javax.ejb;
import java.util.*;
import java.security.Identity;
/**
* The EntityContext interface provides an instance with access to the
* container-provided runtime context of an entity bean instance.
* The container passes the EntityContext interface to an entity
* bean instance after the instance has been created.
*
* <p> The EntityContext interface remains associated with the instance for
* the lifetime of the instance. Note that the information that the instance
* obtains using the EntityContext interface (such as the result of the
* getPrimaryKey() method) may change, as the container assigns the instance
* to different EJB objects during the instance's life cycle.
*
* @since EJB 2.0
*/
public interface EntityContext extends EJBContext
{
/**
* Obtain a reference to the EJB local object that is currently
* associated with the instance.
*
* <p> An instance of an entity bean can call this method only
* when the instance is associated with an EJB local object identity, i.e.
* in the ejbActivate, ejbPassivate, ejbPostCreate, ejbRemove,
* ejbLoad, ejbStore, and business methods.
*
* <p> An instance can use this method, for example, when it wants to
* pass a reference to itself in a method argument or result.
*
* @return The EJB local object currently associated with the instance.
*
* @exception IllegalStateException if the instance invokes this
* method while the instance is in a state that does not allow the
* instance to invoke this method, or if the instance does not have
* a local interface.
*
* @since EJB 2.0
*/
EJBLocalObject getEJBLocalObject() throws IllegalStateException;
/**
* Obtain a reference to the EJB object that is currently associated with
* the instance.
*
* <p> An instance of an entity bean can call this method only
* when the instance is associated with an EJB object identity, i.e.
* in the ejbActivate, ejbPassivate, ejbPostCreate, ejbRemove,
* ejbLoad, ejbStore, and business methods.
*
* <p> An instance can use this method, for example, when it wants to
* pass a reference to itself in a method argument or result.
*
* @return The EJB object currently associated with the instance.
*
* @exception IllegalStateException Thrown if the instance invokes this
* method while the instance is in a state that does not allow the
* instance to invoke this method, or if the instance does not have
* a remote interface.
*/
EJBObject getEJBObject() throws IllegalStateException;
/**
* Obtain the primary key of the EJB object that is currently
* associated with this instance.
*
* <p> An instance of an entity bean can call this method only
* when the instance is associated with an EJB object identity, i.e.
* in the ejbActivate, ejbPassivate, ejbPostCreate, ejbRemove,
* ejbLoad, ejbStore, and business methods.
*
* <p><b>Note</b>: The result of this method is that same as the
* result of getEJBObject().getPrimaryKey().
*
* @return The primary key currently associated with the instance.
*
* @exception IllegalStateException Thrown if the instance invokes this
* method while the instance is in a state that does not allow the
* instance to invoke this method.
*/
Object getPrimaryKey() throws IllegalStateException;
}