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package oracle.toplink.essentials.internal.sessions;
import oracle.toplink.essentials.mappings.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import java.io.Serializable;
/**
* <p>
* <b>Purpose</b>: This class was designed as a superclass to all possible Change Record types.
* These Change Records holds the changes made to the objects
* <p>
*
* @see KnownSubclasses prototype.changeset.CollectionChangeRecord,prototype.changeset.DirectToFieldChangeRecord,prototype.changeset.SingleObjectChangeRecord
*/
public abstract class ChangeRecord implements Serializable, oracle.toplink.essentials.changesets.ChangeRecord {
/**
* This is the attribute name that this change record represents
*/
protected String attribute;
/**
* This attribute stores the mapping allong with the attribute so that the mapping does not need to be looked up
*/
protected transient DatabaseMapping mapping;
/** This is the object change set that holds this record **/
protected ObjectChangeSet owner;
/**
* ADVANCED:
* Returns the name of the attribute this ChangeRecord Represents
* @return java.lang.String
*/
public String getAttribute() {
return attribute;
}
/**
* ADVANCED:
* Returns the mapping for the attribute this ChangeRecord Represents
*/
public DatabaseMapping getMapping() {
return mapping;
}
/**
* Insert the method's description here.
* Creation date: (5/30/00 3:42:14 PM)
* @return prototype.changeset.ObjectChangeSet
*/
public oracle.toplink.essentials.changesets.ObjectChangeSet getOwner() {
return (oracle.toplink.essentials.changesets.ObjectChangeSet)owner;
}
/**
* INTERNAL:
* This method will be used to merge one record into another
*/
public abstract void mergeRecord(ChangeRecord mergeFromRecord, UnitOfWorkChangeSet mergeToChangeSet, UnitOfWorkChangeSet mergeFromChangeSet);
/**
* INTERNAL:
* Ensure this change record is ready to by sent remotely for cache synchronization
* In general, this means setting the CacheSynchronizationType on any ObjectChangeSets
* associated with this ChangeRecord
*/
public void prepareForSynchronization(AbstractSession session) {
}
/**
* Sets the name of the attribute that this Record represents
* @param newValue java.lang.String
*/
public void setAttribute(String newValue) {
this.attribute = newValue;
}
/**
* Sets the mapping for the attribute that this Record represents
*/
public void setMapping(DatabaseMapping mapping) {
this.mapping = mapping;
}
/**
* INTERNAL:
* This method is used to set the ObjectChangeSet that uses this Record in that Record
* @param newOwner prototype.changeset.ObjectChangeSet The changeSet that uses this record
*/
public void setOwner(ObjectChangeSet newOwner) {
owner = newOwner;
}
public String toString() {
return this.getClass().getName() + "(" + getAttribute() + ")";
}
/**
* INTERNAL:
* used by the record to update the new value ignores the value in the default implementation
*/
public void updateChangeRecordWithNewValue(Object newValue) {
//no op
}
/**
* INTERNAL:
* This method will be used to update the objectsChangeSets references
*/
public abstract void updateReferences(UnitOfWorkChangeSet mergeToChangeSet, UnitOfWorkChangeSet mergeFromChangeSet);
}
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