oracle.toplink.essentials.mappings.ManyToManyMapping Maven / Gradle / Ivy
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package oracle.toplink.essentials.mappings;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.internal.databaseaccess.*;
import oracle.toplink.essentials.internal.expressions.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.internal.queryframework.*;
import oracle.toplink.essentials.internal.sessions.*;
import oracle.toplink.essentials.sessions.DatabaseRecord;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* Purpose: Many to many mappings are used to represent the relationships
* between a collection of source objects and a collection of target objects.
* The mapping require the creation of an intermediate table for managing the
* associations between the source and target records.
*
* @author Sati
* @since TOPLink/Java 1.0
*/
public class ManyToManyMapping extends CollectionMapping implements RelationalMapping {
/** Used for data modification events. */
protected static final String PostInsert = "postInsert";
protected static final String ObjectRemoved = "objectRemoved";
protected static final String ObjectAdded = "objectAdded";
/** The intermediate relation table. */
protected transient DatabaseTable relationTable;
/** The field in the source table that corresponds to the key in the relation table */
protected transient Vector sourceKeyFields;
/** The field in the target table that corresponds to the key in the relation table */
protected transient Vector targetKeyFields;
/** The field in the intermediate table that corresponds to the key in the source table */
protected transient Vector sourceRelationKeyFields;
/** The field in the intermediate table that corresponds to the key in the target table */
protected transient Vector targetRelationKeyFields;
/** Query used for single row deletion. */
protected transient DataModifyQuery deleteQuery;
protected transient boolean hasCustomDeleteQuery;
/** Used for insertion. */
protected transient DataModifyQuery insertQuery;
protected transient boolean hasCustomInsertQuery;
/**
* PUBLIC:
* Default constructor.
*/
public ManyToManyMapping() {
this.insertQuery = new DataModifyQuery();
this.deleteQuery = new DataModifyQuery();
this.sourceRelationKeyFields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(1);
this.targetRelationKeyFields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(1);
this.sourceKeyFields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(1);
this.targetKeyFields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(1);
this.hasCustomDeleteQuery = false;
this.hasCustomInsertQuery = false;
}
/**
* INTERNAL:
*/
public boolean isRelationalMapping() {
return true;
}
/**
* PUBLIC:
* Add the fields in the intermediate table that corresponds to the primary
* key in the source table. This method is used if the keys are composite.
*/
public void addSourceRelationKeyField(DatabaseField sourceRelationKeyField, DatabaseField sourcePrimaryKeyField) {
getSourceRelationKeyFields().addElement(sourceRelationKeyField);
getSourceKeyFields().addElement(sourcePrimaryKeyField);
}
/**
* PUBLIC:
* Add the fields in the intermediate table that corresponds to the primary
* key in the source table. This method is used if the keys are composite.
*/
public void addSourceRelationKeyFieldName(String sourceRelationKeyFieldName, String sourcePrimaryKeyFieldName) {
addSourceRelationKeyField(new DatabaseField(sourceRelationKeyFieldName), new DatabaseField(sourcePrimaryKeyFieldName));
}
/**
* PUBLIC:
* Add the fields in the intermediate table that corresponds to the primary
* key in the target table. This method is used if the keys are composite.
*/
public void addTargetRelationKeyField(DatabaseField targetRelationKeyField, DatabaseField targetPrimaryKeyField) {
getTargetRelationKeyFields().addElement(targetRelationKeyField);
getTargetKeyFields().addElement(targetPrimaryKeyField);
}
/**
* PUBLIC:
* Add the fields in the intermediate table that corresponds to the primary
* key in the target table. This method is used if the keys are composite.
*/
public void addTargetRelationKeyFieldName(String targetRelationKeyFieldName, String targetPrimaryKeyFieldName) {
addTargetRelationKeyField(new DatabaseField(targetRelationKeyFieldName), new DatabaseField(targetPrimaryKeyFieldName));
}
/**
* INTERNAL:
* The mapping clones itself to create deep copy.
*/
public Object clone() {
ManyToManyMapping clone = (ManyToManyMapping)super.clone();
clone.setTargetKeyFields(cloneFields(getTargetKeyFields()));
clone.setSourceKeyFields(cloneFields(getSourceKeyFields()));
clone.setTargetRelationKeyFields(cloneFields(getTargetRelationKeyFields()));
clone.setSourceRelationKeyFields(cloneFields(getSourceRelationKeyFields()));
return clone;
}
/**
* INTERNAL:
* Extract the source primary key value from the relation row.
* Used for batch reading, most following same order and fields as in the mapping.
*/
protected Vector extractKeyFromRelationRow(AbstractRecord row, AbstractSession session) {
Vector key = new Vector(getSourceRelationKeyFields().size());
for (int index = 0; index < getSourceRelationKeyFields().size(); index++) {
DatabaseField relationField = (DatabaseField)getSourceRelationKeyFields().elementAt(index);
DatabaseField sourceField = (DatabaseField)getSourceKeyFields().elementAt(index);
Object value = row.get(relationField);
// Must ensure the classificatin to get a cache hit.
try {
value = session.getDatasourcePlatform().getConversionManager().convertObject(value, getDescriptor().getObjectBuilder().getFieldClassification(sourceField));
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(this, getDescriptor(), e);
}
key.addElement(value);
}
return key;
}
/**
* INTERNAL:
* Extract the primary key value from the source row.
* Used for batch reading, most following same order and fields as in the mapping.
*/
protected Vector extractPrimaryKeyFromRow(AbstractRecord row, AbstractSession session) {
Vector key = new Vector(getSourceKeyFields().size());
for (Enumeration fieldEnum = getSourceKeyFields().elements(); fieldEnum.hasMoreElements();) {
DatabaseField field = (DatabaseField)fieldEnum.nextElement();
Object value = row.get(field);
// Must ensure the classificatin to get a cache hit.
try {
value = session.getDatasourcePlatform().getConversionManager().convertObject(value, getDescriptor().getObjectBuilder().getFieldClassification(field));
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(this, getDescriptor(), e);
}
key.addElement(value);
}
return key;
}
protected DataModifyQuery getDeleteQuery() {
return deleteQuery;
}
protected DataModifyQuery getInsertQuery() {
return insertQuery;
}
/**
* INTERNAL:
* Return the relation table associated with the mapping.
*/
public DatabaseTable getRelationTable() {
return relationTable;
}
/**
* PUBLIC:
* Return the relation table name associated with the mapping.
*/
public String getRelationTableName() {
if (relationTable == null) {
return null;
}
return relationTable.getName();
}
//CR#2407 This method is added to include table qualifier.
/**
* PUBLIC:
* Return the relation table qualified name associated with the mapping.
*/
public String getRelationTableQualifiedName() {
if (relationTable == null) {
return null;
}
return relationTable.getQualifiedName();
}
/**
* INTERNAL:
* Returns the selection criteria stored in the mapping selection query. This criteria
* is used to read reference objects from the database.
*/
public Expression getSelectionCriteria() {
return getSelectionQuery().getSelectionCriteria();
}
/**
* INTERNAL:
* Returns the read query assoicated with the mapping.
*/
public ReadQuery getSelectionQuery() {
return selectionQuery;
}
/**
* PUBLIC:
* Return the source key field names associated with the mapping.
* These are in-order with the sourceRelationKeyFieldNames.
*/
public Vector getSourceKeyFieldNames() {
Vector fieldNames = new Vector(getSourceKeyFields().size());
for (Enumeration fieldsEnum = getSourceKeyFields().elements();
fieldsEnum.hasMoreElements();) {
fieldNames.addElement(((DatabaseField)fieldsEnum.nextElement()).getQualifiedName());
}
return fieldNames;
}
/**
* INTERNAL:
* Return all the source key fields associated with the mapping.
*/
public Vector getSourceKeyFields() {
return sourceKeyFields;
}
/**
* PUBLIC:
* Return the source relation key field names associated with the mapping.
* These are in-order with the sourceKeyFieldNames.
*/
public Vector getSourceRelationKeyFieldNames() {
Vector fieldNames = new Vector(getSourceRelationKeyFields().size());
for (Enumeration fieldsEnum = getSourceRelationKeyFields().elements();
fieldsEnum.hasMoreElements();) {
fieldNames.addElement(((DatabaseField)fieldsEnum.nextElement()).getQualifiedName());
}
return fieldNames;
}
/**
* INTERNAL:
* Return all the source realtion key fields associated with the mapping.
*/
public Vector getSourceRelationKeyFields() {
return sourceRelationKeyFields;
}
/**
* PUBLIC:
* Return the target key field names associated with the mapping.
* These are in-order with the targetRelationKeyFieldNames.
*/
public Vector getTargetKeyFieldNames() {
Vector fieldNames = new Vector(getTargetKeyFields().size());
for (Enumeration fieldsEnum = getTargetKeyFields().elements();
fieldsEnum.hasMoreElements();) {
fieldNames.addElement(((DatabaseField)fieldsEnum.nextElement()).getQualifiedName());
}
return fieldNames;
}
/**
* INTERNAL:
* Return all the target keys associated with the mapping.
*/
public Vector getTargetKeyFields() {
return targetKeyFields;
}
/**
* PUBLIC:
* Return the target relation key field names associated with the mapping.
* These are in-order with the targetKeyFieldNames.
*/
public Vector getTargetRelationKeyFieldNames() {
Vector fieldNames = new Vector(getTargetRelationKeyFields().size());
for (Enumeration fieldsEnum = getTargetRelationKeyFields().elements();
fieldsEnum.hasMoreElements();) {
fieldNames.addElement(((DatabaseField)fieldsEnum.nextElement()).getQualifiedName());
}
return fieldNames;
}
/**
* INTERNAL:
* Return all the target relation key fields associated with the mapping.
*/
public Vector getTargetRelationKeyFields() {
return targetRelationKeyFields;
}
/**
* INTERNAL:
* Returns whether the mapping has any constraint dependencies, such as
* join table entries. This dependency is important for deletes from
* unidirectional relationships.
*/
public boolean hasConstraintDependency() {
// Set a dependency on the owning side
return !isReadOnly();
}
protected boolean hasCustomDeleteQuery() {
return hasCustomDeleteQuery;
}
protected boolean hasCustomInsertQuery() {
return hasCustomInsertQuery;
}
/**
* INTERNAL:
* The join table is a dependency if not read-only.
*/
public boolean hasDependency() {
return isPrivateOwned() || (!isReadOnly());
}
/**
* INTERNAL:
* Initialize mappings
*/
public void initialize(AbstractSession session) throws DescriptorException {
super.initialize(session);
initializeRelationTable(session);
initializeSourceRelationKeys(session);
initializeTargetRelationKeys(session);
if (isSingleSourceRelationKeySpecified()) {
initializeSourceKeysWithDefaults(session);
} else {
initializeSourceKeys(session);
}
if (isSingleTargetRelationKeySpecified()) {
initializeTargetKeysWithDefaults(session);
} else {
initializeTargetKeys(session);
}
if (shouldInitializeSelectionCriteria()) {
initializeSelectionCriteria(session);
}
if (!getSelectionQuery().hasSessionName()) {
getSelectionQuery().setSessionName(session.getName());
}
initializeDeleteAllQuery(session);
initializeInsertQuery(session);
initializeDeleteQuery(session);
}
/**
* Initialize delete all query. This query is used to all relevant rows from the
* relation table.
*/
protected void initializeDeleteAllQuery(AbstractSession session) {
if (!getDeleteAllQuery().hasSessionName()) {
getDeleteAllQuery().setSessionName(session.getName());
}
if (hasCustomDeleteAllQuery()) {
return;
}
Expression expression = null;
Expression subExpression;
Expression builder = new ExpressionBuilder();
SQLDeleteStatement statement = new SQLDeleteStatement();
// Construct an expression to delete from the relation table.
for (int index = 0; index < getSourceRelationKeyFields().size(); index++) {
DatabaseField sourceRelationKey = (DatabaseField)getSourceRelationKeyFields().elementAt(index);
DatabaseField sourceKey = (DatabaseField)getSourceKeyFields().elementAt(index);
subExpression = builder.getField(sourceRelationKey).equal(builder.getParameter(sourceKey));
expression = subExpression.and(expression);
}
// All the enteries are deleted in one shot.
statement.setWhereClause(expression);
statement.setTable(getRelationTable());
getDeleteAllQuery().setSQLStatement(statement);
}
/**
* INTERNAL:
* Initialize delete query. This query is used to delete a specific row from the join table in uow,
* given the objects on both sides of the relation.
*/
protected void initializeDeleteQuery(AbstractSession session) {
if (!getDeleteQuery().hasSessionName()) {
getDeleteQuery().setSessionName(session.getName());
}
if (hasCustomDeleteQuery()) {
return;
}
// Build where clause expression.
Expression whereClause = null;
Expression builder = new ExpressionBuilder();
Enumeration relationKeyEnum = getSourceRelationKeyFields().elements();
for (; relationKeyEnum.hasMoreElements();) {
DatabaseField relationKey = (DatabaseField)relationKeyEnum.nextElement();
Expression expression = builder.getField(relationKey).equal(builder.getParameter(relationKey));
whereClause = expression.and(whereClause);
}
relationKeyEnum = getTargetRelationKeyFields().elements();
for (; relationKeyEnum.hasMoreElements();) {
DatabaseField relationKey = (DatabaseField)relationKeyEnum.nextElement();
Expression expression = builder.getField(relationKey).equal(builder.getParameter(relationKey));
whereClause = expression.and(whereClause);
}
SQLDeleteStatement statement = new SQLDeleteStatement();
statement.setTable(getRelationTable());
statement.setWhereClause(whereClause);
getDeleteQuery().setSQLStatement(statement);
}
/**
* INTERNAL:
* Initialize insert query. This query is used to insert the collection of objects into the
* relation table.
*/
protected void initializeInsertQuery(AbstractSession session) {
if (!getInsertQuery().hasSessionName()) {
getInsertQuery().setSessionName(session.getName());
}
if (hasCustomInsertQuery()) {
return;
}
SQLInsertStatement statement = new SQLInsertStatement();
statement.setTable(getRelationTable());
AbstractRecord joinRow = new DatabaseRecord();
for (Enumeration targetEnum = getTargetRelationKeyFields().elements();
targetEnum.hasMoreElements();) {
joinRow.put((DatabaseField)targetEnum.nextElement(), null);
}
for (Enumeration sourceEnum = getSourceRelationKeyFields().elements();
sourceEnum.hasMoreElements();) {
joinRow.put((DatabaseField)sourceEnum.nextElement(), null);
}
statement.setModifyRow(joinRow);
getInsertQuery().setSQLStatement(statement);
getInsertQuery().setModifyRow(joinRow);
}
/**
* INTERNAL:
* Set the table qualifier on the relation table if required
*/
protected void initializeRelationTable(AbstractSession session) throws DescriptorException {
Platform platform = session.getDatasourcePlatform();
if ((getRelationTable() == null) || (getRelationTableName().length() == 0)) {
throw DescriptorException.noRelationTable(this);
}
if (platform.getTableQualifier().length() == 0) {
return;
}
if (getRelationTable().getTableQualifier().length() == 0) {
getRelationTable().setTableQualifier(platform.getTableQualifier());
}
}
/**
* INTERNAL:
* Selection criteria is created to read target records from the table.
*/
protected void initializeSelectionCriteria(AbstractSession session) {
DatabaseField relationKey;
DatabaseField sourceKey;
DatabaseField targetKey;
Expression exp1;
Expression exp2;
Expression expression;
Expression criteria;
Expression builder = new ExpressionBuilder();
Enumeration relationKeyEnum;
Enumeration sourceKeyEnum;
Enumeration targetKeyEnum;
Expression linkTable = null;
targetKeyEnum = getTargetKeyFields().elements();
relationKeyEnum = getTargetRelationKeyFields().elements();
for (; targetKeyEnum.hasMoreElements();) {
relationKey = (DatabaseField)relationKeyEnum.nextElement();
targetKey = (DatabaseField)targetKeyEnum.nextElement();
if (linkTable == null) {// We could just call getTable repeatedly, but it's a waste
linkTable = builder.getTable(relationKey.getTable());
}
exp1 = builder.getField(targetKey);
exp2 = linkTable.getField(relationKey);
expression = exp1.equal(exp2);
if ((criteria = getSelectionCriteria()) == null) {
criteria = expression;
} else {
criteria = expression.and(criteria);
}
setSelectionCriteria(criteria);
}
relationKeyEnum = getSourceRelationKeyFields().elements();
sourceKeyEnum = getSourceKeyFields().elements();
for (; relationKeyEnum.hasMoreElements();) {
relationKey = (DatabaseField)relationKeyEnum.nextElement();
sourceKey = (DatabaseField)sourceKeyEnum.nextElement();
exp1 = linkTable.getField(relationKey);
exp2 = builder.getParameter(sourceKey);
expression = exp1.equal(exp2);
if ((criteria = getSelectionCriteria()) == null) {
criteria = expression;
} else {
criteria = expression.and(criteria);
}
setSelectionCriteria(criteria);
}
}
/**
* INTERNAL:
* All the source key field names are converted to DatabaseField and stored.
*/
protected void initializeSourceKeys(AbstractSession session) {
for (Enumeration sourceEnum = getSourceKeyFields().elements();
sourceEnum.hasMoreElements();) {
getDescriptor().buildField((DatabaseField)sourceEnum.nextElement());
}
}
/**
* INTERNAL:
* If a user does not specify the source key then the primary keys of the source table are used.
*/
protected void initializeSourceKeysWithDefaults(AbstractSession session) {
List primaryKeyFields = getDescriptor().getPrimaryKeyFields();
for (int index = 0; index < primaryKeyFields.size(); index++) {
getSourceKeyFields().addElement(primaryKeyFields.get(index));
}
}
/**
* INTERNAL:
* All the source relation key field names are converted to DatabaseField and stored.
*/
protected void initializeSourceRelationKeys(AbstractSession session) throws DescriptorException {
if (getSourceRelationKeyFields().size() == 0) {
throw DescriptorException.noSourceRelationKeysSpecified(this);
}
for (Enumeration entry = getSourceRelationKeyFields().elements(); entry.hasMoreElements();) {
DatabaseField field = (DatabaseField)entry.nextElement();
if (field.hasTableName() && (!(field.getTableName().equals(getRelationTable().getName())))) {
throw DescriptorException.relationKeyFieldNotProperlySpecified(field, this);
}
field.setTable(getRelationTable());
}
}
/**
* INTERNAL:
* All the target key field names are converted to DatabaseField and stored.
*/
protected void initializeTargetKeys(AbstractSession session) {
for (Enumeration targetEnum = getTargetKeyFields().elements();
targetEnum.hasMoreElements();) {
getReferenceDescriptor().buildField((DatabaseField)targetEnum.nextElement());
}
}
/**
* INTERNAL:
* If a user does not specify the target key then the primary keys of the target table are used.
*/
protected void initializeTargetKeysWithDefaults(AbstractSession session) {
List primaryKeyFields = getReferenceDescriptor().getPrimaryKeyFields();
for (int index = 0; index < primaryKeyFields.size(); index++) {
getTargetKeyFields().addElement(primaryKeyFields.get(index));
}
}
/**
* INTERNAL:
* All the target relation key field names are converted to DatabaseField and stored.
*/
protected void initializeTargetRelationKeys(AbstractSession session) {
if (getTargetRelationKeyFields().size() == 0) {
throw DescriptorException.noTargetRelationKeysSpecified(this);
}
for (Enumeration targetEnum = getTargetRelationKeyFields().elements();
targetEnum.hasMoreElements();) {
DatabaseField field = (DatabaseField)targetEnum.nextElement();
if (field.hasTableName() && (!(field.getTableName().equals(getRelationTable().getName())))) {
throw DescriptorException.relationKeyFieldNotProperlySpecified(field, this);
}
field.setTable(getRelationTable());
}
}
/**
* INTERNAL:
* An object was added to the collection during an update, insert it.
*/
protected void insertAddedObjectEntry(ObjectLevelModifyQuery query, Object objectAdded) throws DatabaseException, OptimisticLockException {
//cr 3819 added the line below to fix the translationtable to ensure that it
// contains the required values
prepareTranslationRow(query.getTranslationRow(), query.getObject(), query.getSession());
AbstractRecord databaseRow = new DatabaseRecord();
// Extract primary key and value from the source.
for (int index = 0; index < getSourceRelationKeyFields().size(); index++) {
DatabaseField sourceRelationKey = (DatabaseField)getSourceRelationKeyFields().elementAt(index);
DatabaseField sourceKey = (DatabaseField)getSourceKeyFields().elementAt(index);
Object sourceKeyValue = query.getTranslationRow().get(sourceKey);
databaseRow.put(sourceRelationKey, sourceKeyValue);
}
// Extract target field and its value. Construct insert statement and execute it
for (int index = 0; index < getTargetRelationKeyFields().size(); index++) {
DatabaseField targetRelationKey = (DatabaseField)getTargetRelationKeyFields().elementAt(index);
DatabaseField targetKey = (DatabaseField)getTargetKeyFields().elementAt(index);
Object targetKeyValue = getReferenceDescriptor().getObjectBuilder().extractValueFromObjectForField(objectAdded, targetKey, query.getSession());
databaseRow.put(targetRelationKey, targetKeyValue);
}
query.getSession().executeQuery(getInsertQuery(), databaseRow);
}
/**
* INTERNAL:
* Insert into relation table. This follows following steps.
* - Extract primary key and its value from the source object.
*
- Extract target key and its value from the target object.
*
- Construct a insert statement with above fields and values for relation table.
*
- execute the statement.
*
- Repeat above three statements until all the target objects are done.
*/
public void insertIntoRelationTable(WriteObjectQuery query) throws DatabaseException {
if (isReadOnly()) {
return;
}
ContainerPolicy cp = getContainerPolicy();
Object objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
if (cp.isEmpty(objects)) {
return;
}
prepareTranslationRow(query.getTranslationRow(), query.getObject(), query.getSession());
AbstractRecord databaseRow = new DatabaseRecord();
// Extract primary key and value from the source.
for (int index = 0; index < getSourceRelationKeyFields().size(); index++) {
DatabaseField sourceRelationKey = (DatabaseField)getSourceRelationKeyFields().elementAt(index);
DatabaseField sourceKey = (DatabaseField)getSourceKeyFields().elementAt(index);
Object sourceKeyValue = query.getTranslationRow().get(sourceKey);
databaseRow.put(sourceRelationKey, sourceKeyValue);
}
// Extract target field and its value. Construct insert statement and execute it
for (Object iter = cp.iteratorFor(objects); cp.hasNext(iter);) {
Object object = cp.next(iter, query.getSession());
for (int index = 0; index < getTargetRelationKeyFields().size(); index++) {
DatabaseField targetRelationKey = (DatabaseField)getTargetRelationKeyFields().elementAt(index);
DatabaseField targetKey = (DatabaseField)getTargetKeyFields().elementAt(index);
Object targetKeyValue = getReferenceDescriptor().getObjectBuilder().extractValueFromObjectForField(object, targetKey, query.getSession());
databaseRow.put(targetRelationKey, targetKeyValue);
}
query.getSession().executeQuery(getInsertQuery(), databaseRow);
}
}
/**
* INTERNAL:
* Write the target objects if the cascade policy requires them to be written first.
* They must be written within a unit of work to ensure that they exist.
*/
public void insertTargetObjects(WriteObjectQuery query) throws DatabaseException, OptimisticLockException {
if (!shouldObjectModifyCascadeToParts(query)) {
return;
}
// Only cascade dependents writes in uow.
if (query.shouldCascadeOnlyDependentParts()) {
return;
}
Object objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
ContainerPolicy cp = getContainerPolicy();
if (cp.isEmpty(objects)) {
return;
}
// Write each of the target objects
for (Object objectsIterator = cp.iteratorFor(objects); cp.hasNext(objectsIterator);) {
Object object = cp.next(objectsIterator, query.getSession());
if (isPrivateOwned()) {
// no need to set changeset as insert is a straight copy anyway
InsertObjectQuery insertQuery = new InsertObjectQuery();
insertQuery.setObject(object);
insertQuery.setCascadePolicy(query.getCascadePolicy());
query.getSession().executeQuery(insertQuery);
} else {
ObjectChangeSet changeSet = null;
UnitOfWorkChangeSet uowChangeSet = null;
if (query.getSession().isUnitOfWork() && (((UnitOfWorkImpl)query.getSession()).getUnitOfWorkChangeSet() != null)) {
uowChangeSet = (UnitOfWorkChangeSet)((UnitOfWorkImpl)query.getSession()).getUnitOfWorkChangeSet();
changeSet = (ObjectChangeSet)uowChangeSet.getObjectChangeSetForClone(object);
}
WriteObjectQuery writeQuery = new WriteObjectQuery();
writeQuery.setObject(object);
writeQuery.setObjectChangeSet(changeSet);
writeQuery.setCascadePolicy(query.getCascadePolicy());
query.getSession().executeQuery(writeQuery);
}
}
}
/**
* INTERNAL:
* Return if this mapping support joining.
*/
public boolean isJoiningSupported() {
return true;
}
/**
* INTERNAL:
*/
public boolean isManyToManyMapping() {
return true;
}
/**
* INTERNAL:
* Checks if a single source key was specified.
*/
protected boolean isSingleSourceRelationKeySpecified() {
return getSourceKeyFields().isEmpty();
}
/**
* INTERNAL:
* Checks if a single target key was specified.
*/
protected boolean isSingleTargetRelationKeySpecified() {
return getTargetKeyFields().isEmpty();
}
/**
* INTERNAL:
* An object was added to the collection during an update, insert it if private.
*/
protected void objectAddedDuringUpdate(ObjectLevelModifyQuery query, Object objectAdded, ObjectChangeSet changeSet) throws DatabaseException, OptimisticLockException {
// First insert/update object.
super.objectAddedDuringUpdate(query, objectAdded, changeSet);
// In the uow data queries are cached until the end of the commit.
if (query.shouldCascadeOnlyDependentParts()) {
// Hey I might actually want to use an inner class here... ok array for now.
Object[] event = new Object[3];
event[0] = ObjectAdded;
event[1] = query;
event[2] = objectAdded;
query.getSession().getCommitManager().addDataModificationEvent(this, event);
} else {
insertAddedObjectEntry(query, objectAdded);
}
}
/**
* INTERNAL:
* An object was removed to the collection during an update, delete it if private.
*/
protected void objectRemovedDuringUpdate(ObjectLevelModifyQuery query, Object objectDeleted) throws DatabaseException, OptimisticLockException {
AbstractRecord databaseRow = new DatabaseRecord();
// Extract primary key and value from the source.
for (int index = 0; index < getSourceRelationKeyFields().size(); index++) {
DatabaseField sourceRelationKey = (DatabaseField)getSourceRelationKeyFields().elementAt(index);
DatabaseField sourceKey = (DatabaseField)getSourceKeyFields().elementAt(index);
Object sourceKeyValue = query.getTranslationRow().get(sourceKey);
databaseRow.put(sourceRelationKey, sourceKeyValue);
}
// Extract target field and its value. Construct insert statement and execute it
for (int index = 0; index < getTargetRelationKeyFields().size(); index++) {
DatabaseField targetRelationKey = (DatabaseField)getTargetRelationKeyFields().elementAt(index);
DatabaseField targetKey = (DatabaseField)getTargetKeyFields().elementAt(index);
Object targetKeyValue = getReferenceDescriptor().getObjectBuilder().extractValueFromObjectForField(objectDeleted, targetKey, query.getSession());
databaseRow.put(targetRelationKey, targetKeyValue);
}
// In the uow data queries are cached until the end of the commit.
if (query.shouldCascadeOnlyDependentParts()) {
// Hey I might actually want to use an inner class here... ok array for now.
Object[] event = new Object[3];
event[0] = ObjectRemoved;
event[1] = getDeleteQuery();
event[2] = databaseRow;
query.getSession().getCommitManager().addDataModificationEvent(this, event);
} else {
query.getSession().executeQuery(getDeleteQuery(), databaseRow);
}
// Delete object after join entry is delete if private.
super.objectRemovedDuringUpdate(query, objectDeleted);
}
/**
* INTERNAL:
* Perform the commit event.
* This is used in the uow to delay data modifications.
*/
public void performDataModificationEvent(Object[] event, AbstractSession session) throws DatabaseException, DescriptorException {
// Hey I might actually want to use an inner class here... ok array for now.
if (event[0] == PostInsert) {
insertIntoRelationTable((WriteObjectQuery)event[1]);
} else if (event[0] == ObjectRemoved) {
session.executeQuery((DataModifyQuery)event[1], (AbstractRecord)event[(2)]);
} else if (event[0] == ObjectAdded) {
insertAddedObjectEntry((WriteObjectQuery)event[1], event[2]);
} else {
throw DescriptorException.invalidDataModificationEventCode(event[0], this);
}
}
/**
* INTERNAL:
* Insert into relation table. This follows following steps.
*
- Extract primary key and its value from the source object.
*
- Extract target key and its value from the target object.
*
- Construct a insert statement with above fields and values for relation table.
*
- execute the statement.
*
- Repeat above three statements until all the target objects are done.
*/
public void postInsert(WriteObjectQuery query) throws DatabaseException {
insertTargetObjects(query);
// Batch data modification in the uow
if (query.shouldCascadeOnlyDependentParts()) {
// Hey I might actually want to use an inner class here... ok array for now.
Object[] event = new Object[2];
event[0] = PostInsert;
event[1] = query;
query.getSession().getCommitManager().addDataModificationEvent(this, event);
} else {
insertIntoRelationTable(query);
}
}
/**
* INTERNAL:
* Update the relation table with the entries related to this mapping.
* Delete entries removed, insert entries added.
* If private also insert/delete/update target objects.
*/
public void postUpdate(WriteObjectQuery query) throws DatabaseException {
if (isReadOnly()) {
return;
}
// If objects are not instantiated that means they are not changed.
if (!isAttributeValueInstantiated(query.getObject())) {
return;
}
Object objectsInMemoryModel = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
// This accesses the backup in uow otherwise goes to database (may be better of to delete all in non uow case).
Object currentObjectsInDB = readPrivateOwnedForObject(query);
if (currentObjectsInDB == null) {
currentObjectsInDB = getContainerPolicy().containerInstance(1);
}
compareObjectsAndWrite(currentObjectsInDB, objectsInMemoryModel, query);
}
/**
* INTERNAL:
* Delete entries related to this mapping from the relation table.
*/
public void preDelete(WriteObjectQuery query) throws DatabaseException {
Object objectsIterator = null;
ContainerPolicy containerPolicy = getContainerPolicy();
Object objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
if (shouldObjectModifyCascadeToPartsForPreDelete(query)) {
//this must be done up here because the select must be done before the entry in the relation table is deleted.
objectsIterator = containerPolicy.iteratorFor(objects);
}
if (!isReadOnly()) {
prepareTranslationRow(query.getTranslationRow(), query.getObject(), query.getSession());
query.getSession().executeQuery(getDeleteAllQuery(), query.getTranslationRow());
}
// If privately owned delete the objects, this does not handle removed objects (i.e. verify delete, not req in uow).
// Does not try to optimize delete all like 1-m, (rarely used and hard to do).
if (shouldObjectModifyCascadeToPartsForPreDelete(query)) {
if (objects != null) {
//objectsIterator will not be null because cascade check will still return true.
while (containerPolicy.hasNext(objectsIterator)) {
Object object = containerPolicy.next(objectsIterator, query.getSession());
// Do not cascade to objects that are currently being processed
if (!query.getSession().getCommitManager().isCommitInPreModify(object) &&
shouldObjectDeleteCascadeToPart(query, object)) {
DeleteObjectQuery deleteQuery = new DeleteObjectQuery();
deleteQuery.setObject(object);
deleteQuery.setCascadePolicy(query.getCascadePolicy());
query.getSession().executeQuery(deleteQuery);
}
}
}
}
}
/**
* INTERNAL:
* The translation row may require additional fields than the primary key if the mapping in not on the primary key.
*/
protected void prepareTranslationRow(AbstractRecord translationRow, Object object, AbstractSession session) {
// Make sure that each source key field is in the translation row.
for (Enumeration sourceFieldsEnum = getSourceKeyFields().elements();
sourceFieldsEnum.hasMoreElements();) {
DatabaseField sourceKey = (DatabaseField)sourceFieldsEnum.nextElement();
if (!translationRow.containsKey(sourceKey)) {
Object value = getDescriptor().getObjectBuilder().extractValueFromObjectForField(object, sourceKey, session);
translationRow.put(sourceKey, value);
}
}
}
/**
* PUBLIC:
* The default delete query for mapping can be overridden by specifying the new query.
* This query must delete the row from the M-M join table.
*/
public void setCustomDeleteQuery(DataModifyQuery query) {
setDeleteQuery(query);
setHasCustomDeleteQuery(true);
}
/**
* PUBLIC:
* The default insert query for mapping can be overridden by specifying the new query.
* This query must insert the row into the M-M join table.
*/
public void setCustomInsertQuery(DataModifyQuery query) {
setInsertQuery(query);
setHasCustomInsertQuery(true);
}
protected void setDeleteQuery(DataModifyQuery deleteQuery) {
this.deleteQuery = deleteQuery;
}
/**
* PUBLIC:
* Set the receiver's delete SQL string. This allows the user to override the SQL
* generated by TOPLink, with there own SQL or procedure call. The arguments are
* translated from the fields of the source row, through replacing the field names
* marked by '#' with the values for those fields.
* This is used to delete a single entry from the M-M join table.
* Example, 'delete from PROJ_EMP where PROJ_ID = #PROJ_ID AND EMP_ID = #EMP_ID'.
*/
public void setDeleteSQLString(String sqlString) {
DataModifyQuery query = new DataModifyQuery();
query.setSQLString(sqlString);
setCustomDeleteQuery(query);
}
/**
* PUBLIC:
* Set the receiver's delete Call. This allows the user to override the SQL
* generated by TOPLink, with there own SQL or procedure call. The arguments are
* translated from the fields of the source row.
* This is used to delete a single entry from the M-M join table.
* Example, 'new SQLCall("delete from PROJ_EMP where PROJ_ID = #PROJ_ID AND EMP_ID = #EMP_ID")'.
*/
public void setDeleteCall(Call call) {
DataModifyQuery query = new DataModifyQuery();
query.setCall(call);
setCustomDeleteQuery(query);
}
protected void setHasCustomDeleteQuery(boolean hasCustomDeleteQuery) {
this.hasCustomDeleteQuery = hasCustomDeleteQuery;
}
protected void setHasCustomInsertQuery(boolean bool) {
hasCustomInsertQuery = bool;
}
protected void setInsertQuery(DataModifyQuery insertQuery) {
this.insertQuery = insertQuery;
}
/**
* PUBLIC:
* Set the receiver's insert SQL string. This allows the user to override the SQL
* generated by TOPLink, with there own SQL or procedure call. The arguments are
* translated from the fields of the source row, through replacing the field names
* marked by '#' with the values for those fields.
* This is used to insert an entry into the M-M join table.
* Example, 'insert into PROJ_EMP (EMP_ID, PROJ_ID) values (#EMP_ID, #PROJ_ID)'.
*/
public void setInsertSQLString(String sqlString) {
DataModifyQuery query = new DataModifyQuery();
query.setSQLString(sqlString);
setCustomInsertQuery(query);
}
/**
* PUBLIC:
* Set the receiver's insert Call. This allows the user to override the SQL
* generated by TOPLink, with there own SQL or procedure call. The arguments are
* translated from the fields of the source row.
* This is used to insert an entry into the M-M join table.
* Example, 'new SQLCall("insert into PROJ_EMP (EMP_ID, PROJ_ID) values (#EMP_ID, #PROJ_ID)")'.
*/
public void setInsertCall(Call call) {
DataModifyQuery query = new DataModifyQuery();
query.setCall(call);
setCustomInsertQuery(query);
}
/**
* PUBLIC:
* Set the relational table.
* This is the join table that store both the source and target primary keys.
*/
public void setRelationTable(DatabaseTable relationTable) {
this.relationTable = relationTable;
}
/**
* PUBLIC:
* Set the name of the relational table.
* This is the join table that store both the source and target primary keys.
*/
public void setRelationTableName(String tableName) {
relationTable = new DatabaseTable(tableName);
}
/**
* PUBLIC:
* Set the name of the session to execute the mapping's queries under.
* This can be used by the session broker to override the default session
* to be used for the target class.
*/
public void setSessionName(String name) {
super.setSessionName(name);
getInsertQuery().setSessionName(name);
getDeleteQuery().setSessionName(name);
}
/**
* PUBLIC:
* Set the source key field names associated with the mapping.
* These must be in-order with the sourceRelationKeyFieldNames.
*/
public void setSourceKeyFieldNames(Vector fieldNames) {
Vector fields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldNames.size());
for (Enumeration fieldNamesEnum = fieldNames.elements(); fieldNamesEnum.hasMoreElements();) {
fields.addElement(new DatabaseField((String)fieldNamesEnum.nextElement()));
}
setSourceKeyFields(fields);
}
/**
* INTERNAL:
* Set the source fields.
*/
public void setSourceKeyFields(Vector sourceKeyFields) {
this.sourceKeyFields = sourceKeyFields;
}
/**
* PUBLIC:
* Set the source key field in the relation table.
* This is the name of the foreign key in the relation table to the source's primary key field.
* This method is used if the source primary key is a singleton only.
*/
public void setSourceRelationKeyFieldName(String sourceRelationKeyFieldName) {
getSourceRelationKeyFields().addElement(new DatabaseField(sourceRelationKeyFieldName));
}
/**
* PUBLIC:
* Set the source relation key field names associated with the mapping.
* These must be in-order with the sourceKeyFieldNames.
*/
public void setSourceRelationKeyFieldNames(Vector fieldNames) {
Vector fields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldNames.size());
for (Enumeration fieldNamesEnum = fieldNames.elements(); fieldNamesEnum.hasMoreElements();) {
fields.addElement(new DatabaseField((String)fieldNamesEnum.nextElement()));
}
setSourceRelationKeyFields(fields);
}
/**
* INTERNAL:
* Set the source fields.
*/
public void setSourceRelationKeyFields(Vector sourceRelationKeyFields) {
this.sourceRelationKeyFields = sourceRelationKeyFields;
}
/**
* INTERNAL:
* Set the target key field names associated with the mapping.
* These must be in-order with the targetRelationKeyFieldNames.
*/
public void setTargetKeyFieldNames(Vector fieldNames) {
Vector fields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldNames.size());
for (Enumeration fieldNamesEnum = fieldNames.elements(); fieldNamesEnum.hasMoreElements();) {
fields.addElement(new DatabaseField((String)fieldNamesEnum.nextElement()));
}
setTargetKeyFields(fields);
}
/**
* INTERNAL:
* Set the target fields.
*/
public void setTargetKeyFields(Vector targetKeyFields) {
this.targetKeyFields = targetKeyFields;
}
/**
* PUBLIC:
* Set the target key field in the relation table.
* This is the name of the foreign key in the relation table to the target's primary key field.
* This method is used if the target's primary key is a singleton only.
*/
public void setTargetRelationKeyFieldName(String targetRelationKeyFieldName) {
getTargetRelationKeyFields().addElement(new DatabaseField(targetRelationKeyFieldName));
}
/**
* INTERNAL:
* Set the target relation key field names associated with the mapping.
* These must be in-order with the targetKeyFieldNames.
*/
public void setTargetRelationKeyFieldNames(Vector fieldNames) {
Vector fields = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldNames.size());
for (Enumeration fieldNamesEnum = fieldNames.elements(); fieldNamesEnum.hasMoreElements();) {
fields.addElement(new DatabaseField((String)fieldNamesEnum.nextElement()));
}
setTargetRelationKeyFields(fields);
}
/**
* INTERNAL:
* Set the target fields.
*/
public void setTargetRelationKeyFields(Vector targetRelationKeyFields) {
this.targetRelationKeyFields = targetRelationKeyFields;
}
/**
* Return whether any process leading to object deletion should also affect its parts.
* Used in preDelete. Note that dependencies are reversed for deletes:
* Join table entries must be removed before the related objects can be deleted.
* So the owning side must be deleted before the non-owning side is processed.
*/
protected boolean shouldObjectModifyCascadeToPartsForPreDelete(ObjectLevelModifyQuery query) {
// Always cascade for privately-owned parts
if (isPrivateOwned()) {
return true;
}
// The non-owning side is read-only for join table mappings.
if (query.shouldCascadeOnlyDependentParts()) {
return isReadOnly();
}
return query.shouldCascadeAllParts();
}
}