commonj.sdo.helper.CopyHelper Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation
EclipseLink build based upon Git transaction f2b9fc5
There is a newer version: 5.0.0-B03
/**
 * 
 *
 * Service Data Objects
 * Version 2.1.1
 * Licensed Materials
 *
 * (c) Copyright BEA Systems, Inc., International Business Machines Corporation, 
 * Oracle Corporation, Primeton Technologies Ltd., Rogue Wave Software, SAP AG., 
 * Software AG., Sun Microsystems, Sybase Inc., Xcalia, Zend Technologies, 
 * 2005-2008. All rights reserved.
 *
 * 
 * 
 */

package commonj.sdo.helper;

import commonj.sdo.DataObject;
import commonj.sdo.impl.HelperProvider;

/**
 * A helper for copying DataObjects.
 */
public interface CopyHelper
{
    /**
     * Create a shallow copy of the DataObject dataObject:
     *   Creates a new DataObject copiedDataObject with the same values
     *     as the source dataObject for each property where
     *       property.getType().isDataType() is true.
     *   The value of such a Property property in copiedDataObject is: 
     *       dataObject.get(property) for single-valued Properties 
     *       (copiedDataObject.get(property) equals() dataObject.get(property)), or 
     *       a List where each member is equal to the member at the 
     *       same index in dataObject for multi-valued Properties
     *        copiedDataObject.getList(property).get(i) equals() dataObject.getList(property).get(i)
     *   The copied Object is unset for each Property where
     *       property.getType().isDataType() is false
     *       since they are not copied.
     *   Read-only properties are copied.
     *   A copied object shares metadata with the source object
     *     sourceDO.getType() == copiedDO.getType()
     *   If a ChangeSummary is part of the source DataObject
     *     the copy has a new, empty ChangeSummary.
     *     Logging state is the same as the source ChangeSummary.
     * 
     * @param dataObject to be copied
     * @return copy of dataObject 
     */
    DataObject copyShallow(DataObject dataObject);
    
    /**
     * Create a deep copy of the DataObject tree:
     *   Copies the dataObject and all its {@link commonj.sdo.Property#isContainment() contained}
     *     DataObjects recursively.
     *   Values of Properties are copied as in shallow copy,
     *     and values of Properties where 
     *       property.getType().isDataType() is false
     *     are copied where each value copied must be a
     *       DataObject contained by the source dataObject.
     *     If a DataObject is outside the DataObject tree and the
     *       property is bidirectional, then the DataObject is skipped.
     *     If a DataObject is outside the DataObject tree and the
     *       property is unidirectional, then the same DataObject is referenced.
     *   Read-only properties are copied.
     *   If any DataObject referenced is not in the containment
     *     tree an IllegalArgumentException is thrown.
     *   If a ChangeSummary is part of the copy tree the new 
     *     ChangeSummary refers to objects in the new DataObject tree.
     *     Logging state is the same as the source ChangeSummary.
     * 
     * @param dataObject to be copied.
     * @return copy of dataObject
     * @throws IllegalArgumentException if any referenced DataObject
     *   is not part of the containment tree.
     */
    DataObject copy(DataObject dataObject);

    /**
     * The default CopyHelper.
     */
    CopyHelper INSTANCE = HelperProvider.getCopyHelper();

}