org.plasma.sdo.helper.PlasmaCopyHelper Maven / Gradle / Ivy
/**
* PlasmaSDO™ License
*
* This is a community release of PlasmaSDO™, a dual-license
* Service Data Object (SDO) 2.1 implementation.
* This particular copy of the software is released under the
* version 2 of the GNU General Public License. PlasmaSDO™ was developed by
* TerraMeta Software, Inc.
*
* Copyright (c) 2013, TerraMeta Software, Inc. All rights reserved.
*
* General License information can be found below.
*
* This distribution may include materials developed by third
* parties. For license and attribution notices for these
* materials, please refer to the documentation that accompanies
* this distribution (see the "Licenses for Third-Party Components"
* appendix) or view the online documentation at
*
* Note that copied data objects
* have the same data properties as the source but have new
* (and therefore different) underlying UUID
* and other management properties which are not defined within the
* source Type. Use copied data objects to help automate and save
* save effort when creating NEW data objects. To simply link/add
* and existing data object to a new data graph, first use {@link DataObject.detach()} to
* remove it from its graph. Than add it to a another graph.
*
*/
public class PlasmaCopyHelper implements CopyHelper {
static public volatile PlasmaCopyHelper INSTANCE = initializeInstance();
private PlasmaCopyHelper() {
}
public static PlasmaCopyHelper instance()
{
if (INSTANCE == null)
initializeInstance();
return INSTANCE;
}
private static synchronized PlasmaCopyHelper initializeInstance()
{
if (INSTANCE == null)
INSTANCE = new PlasmaCopyHelper();
return INSTANCE;
}
/**
* 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 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.
* The Logging state in the source ChangeSummary is not replicated in the
* target ChangeSummary. All copied data objects are in a 'created' state
* ready to be used for insert operations.
*
*
* Note that in general copied data objects
* have the same data properties as the source but have new
* (and therefore different) underlying UUID
* and other management properties which are not defined within the
* source Type. Use copied data objects to help automate and save
* save effort when creating NEW data objects. To simply link/add
* and existing data object to a new data graph, first use {@link DataObject.detach()} to
* remove it from its graph. Than add it to a another graph.
*
*
* @param dataObject to be copied
* @return copy of dataObject
*/
public DataObject copyShallow(DataObject dataObject) {
CoreDataObject result = (CoreDataObject)PlasmaDataFactory.INSTANCE.create(
dataObject.getType());
copy((CoreDataObject)dataObject, result);
return result;
}
/**
* Create a shallow copy of the given dataObject but where
* the UUID
* and other instance properties are copied from the given data object copied as well.
*
* Note that data objects copied using this method should typically be used as "references" in
* UPDATE and DELETE operations, in order to avoid unnecessary queries.
*
* @param dataObject
* @return the copied data object
*/
public DataObject copyShallowAsReference(DataObject dataObject) {
CoreDataObject source = (CoreDataObject)dataObject;
CoreDataObject result = (CoreDataObject)PlasmaDataFactory.INSTANCE.create(
source.getType());
((CoreNode)result).setValue(CoreConstants.PROPERTY_NAME_SNAPSHOT_TIMESTAMP,
((CoreNode)dataObject).getValue(CoreConstants.PROPERTY_NAME_SNAPSHOT_TIMESTAMP));
result.resetUUID(source.getUUID());
copy(source, result);
return result;
}
private void copy(CoreDataObject source, CoreDataObject result)
{
PlasmaType type = (PlasmaType)source.getType();
Object value = null;
for (String key : source.getValueObject().getKeys()) {
Property property = type.findProperty(key);
if (property != null) {
value = source.get(property);
if (value == null)
continue;
if (property.getType().isDataType()) {
if (!property.isReadOnly()) {
result.set(property, value);
}
else {
result.getValueObject().put(property.getName(), value);
}
}
}
else { // assume instance property
value = source.getValueObject().get(key);
if (value == null)
continue;
result.getValueObject().put(key, value);
}
}
}
/**
* 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.
* The Logging state in the source ChangeSummary is not replicated in the
* target ChangeSummary. All copied data objects are in a 'created' state
* ready to be used for insert operations.
*
*
* Note that in general copied data objects
* have the same data properties as the source but have new
* (and therefore different) underlying UUID
* and other management properties which are not defined within the
* source Type. Use copied data objects to help automate and save
* save effort when creating NEW data objects. To simply link/add
* an existing data object to a new data graph, first use {@link DataObject.detach()} to
* remove it from its graph. Than add it to a another graph.
*
*
* @param dataObject to be copied.
* @return copy of dataObject
* @throws IllegalArgumentException if any referenced DataObject
* is not part of the containment tree.
*/
public DataObject copy(DataObject dataObject) {
DataGraphCopyVisitor visitor = new DataGraphCopyVisitor();
((PlasmaDataObject)dataObject).accept(visitor);
return visitor.getResult();
}
/**
* Create a deep copy of the given dataObject tree but where
* the UUID
* and other instance properties are copied from the given data object copied as well.
*
* Note that data graph and data objects copied using this method should typically be used in
* UPDATE and DELETE operations on the resulting data graph, in order to avoid
* unnecessary queries. To simply link/add
* an existing data object to a new data graph, first use {@link DataObject.detach()} to
* remove it from its graph. Than add it to a another graph.
*
* @param dataObject
* @return
*/
public DataObject copyAsReference(DataObject dataObject) {
DataGraphCopyVisitor visitor = new DataGraphCopyVisitor();
visitor.setCopyUUIDs(true);
((PlasmaDataObject)dataObject).accept(visitor);
return visitor.getResult();
}
/**
* Create a deep copy of the DataObject tree while exempting all
* DataObject nodes with an SDO type found in the given reference Types
* array. For all "reference" types found in the source graph, these are
* not copied but "re-parented" to the target graph and not added to the
* change summary. Reference nodes are not removed from the source graph.
*
* 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.
* The Logging state in the source ChangeSummary is not replicated in the
* target ChangeSummary. All copied data objects are in a 'created' state
* ready to be used for insert operations.
*
*
* Note that copied data objects
* have the same data properties as the source but have new
* (and therefore different) underlying UUID
* and other management properties which are not defined within the
* source Type. Use copied data objects to help automate and save
* save effort when creating NEW data objects. To simply link/add
* and existing data object to a new data graph, first use {@link DataObject.detach()} to
* remove it from its graph. Than add it to a another graph.
*
*
* @param dataObject to be copied.
* @param referenceTypes an array of types which are
* @return copy of dataObject
* @throws IllegalArgumentException if any referenced DataObject
* is not part of the containment tree.
*/
public DataObject copy(DataObject dataObject, Type[] referenceTypes) {
DataGraphCopyVisitor visitor = new DataGraphCopyVisitor(referenceTypes);
((PlasmaDataObject)dataObject).accept(visitor);
return visitor.getResult();
}
}
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