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/*
* PersistenceCapable.java
*
* Created on February 25, 2000
*/
package com.sun.jdo.api.persistence.support;
/**
*
* @author Craig Russell
* @version 0.1
*/
/**
* A class that can be managed by a JDO implementation.
*
* <P>Every class whose instances can be managed by a JDO PersistenceManager must
* implement the PersistenceCapable interface.
*
* <P>This interface defines methods that allow the implementation to manage
* the instances. It also defines methods that allow a JDO aware
* application to examine the runtime state of instances. For example,
* an application can discover whether the instance is persistent, transactional,
* dirty, new, or deleted; and to get its associated
* PersistenceManager if it has one.
*
* <P>In the Reference Implementation, the JDO Enhancer modifies the class
* to implement PersistenceCapable prior to loading the class into the runtime
* environment. The Reference Enhancer also adds code to implement the
* methods defined by PersistenceCapable.
*
* <P>The PersistenceCapable interface is designed to avoid name conflicts
* in the scope of user-defined classes. All of its declared method
* names are prefixed with 'jdo'.
*/
public interface PersistenceCapable
{
/** Return the associated PersistenceManager if there is one.
* Transactional and persistent instances return the associated
* PersistenceManager.
*
* <P>Transient non-transactional instances return null.
*<P>
* @return the PersistenceManager associated with this instance.
*/
PersistenceManager jdoGetPersistenceManager();
/** Explicitly mark this instance and this field dirty.
* Normally, PersistenceCapable classes are able to detect changes made
* to their fields. However, if a reference to an Array is given to a
* method outside the class, and the Array is modified, then the
* persistent instance is not aware of the change. This API allows the
* application to notify the instance that a change was made to a field.
*
* <P>Transient instances ignore this method.
*<P>
* @param fieldName the name of the field to be marked dirty.
*/
void jdoMakeDirty(String fieldName);
/** Return a copy of the JDO identity associated with this instance.
*
* <P>Persistent instances of PersistenceCapable classes have a JDO identity
* managed by the PersistenceManager. This method returns a copy of the
* ObjectId that represents the JDO identity.
*
* <P>Transient instances return null.
*
* <P>The ObjectId may be serialized
* and later restored, and used with a PersistenceManager from the same JDO
* implementation to locate a persistent instance with the same data store
* identity.
*
* <P>If the JDO identity is managed by the application, then the ObjectId may
* be used with a PersistenceManager from any JDO implementation that supports
* the PersistenceCapable class.
*
* <P>If the JDO identity is not managed by the application or the data store,
* then the ObjectId returned is only valid within the current transaction.
*<P>
* @see PersistenceManager#getObjectId(Object pc)
* @see PersistenceManager#getObjectById(Object oid)
* @return a copy of the ObjectId of this instance.
*/
Object jdoGetObjectId();
/** Tests whether this object is dirty.
*
* Instances that have been modified, deleted, or newly
* made persistent in the current transaction return true.
*
*<P>Transient instances return false.
*<P>
* @see #jdoMakeDirty(String fieldName)
* @return true if this instance has been modified in the current transaction.
*/
boolean jdoIsDirty();
/** Tests whether this object is transactional.
*
* Instances that respect transaction boundaries return true. These instances
* include transient instances made transactional as a result of being the
* target of a makeTransactional method call; newly made persistent or deleted
* persistent instances; persistent instances read in data store
* transactions; and persistent instances modified in optimistic transactions.
*
*<P>Transient instances return false.
*<P>
* @return true if this instance is transactional.
*/
boolean jdoIsTransactional();
/** Tests whether this object is persistent.
*
* Instances whose state is stored in the data store return true.
*
*<P>Transient instances return false.
*<P>
* @see PersistenceManager#makePersistent(Object pc)
* @return true if this instance is persistent.
*/
boolean jdoIsPersistent();
/** Tests whether this object has been newly made persistent.
*
* Instances that have been made persistent in the current transaction
* return true.
*
*<P>Transient instances return false.
*<P>
* @see PersistenceManager#makePersistent(Object pc)
* @return true if this instance was made persistent
* in the current transaction.
*/
boolean jdoIsNew();
/** Tests whether this object has been deleted.
*
* Instances that have been deleted in the current transaction return true.
*
*<P>Transient instances return false.
*<P>
* @see PersistenceManager#deletePersistent(Object pc)
* @return true if this instance was deleted
* in the current transaction.
*/
boolean jdoIsDeleted();
}
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