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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.jdbc.meta.strats;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.openjpa.enhance.PersistenceCapable;
import org.apache.openjpa.enhance.ReflectingPersistenceCapable;
import org.apache.openjpa.jdbc.identifier.DBIdentifier;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.meta.Embeddable;
import org.apache.openjpa.jdbc.meta.FieldMapping;
import org.apache.openjpa.jdbc.meta.FieldStrategy;
import org.apache.openjpa.jdbc.meta.Joinable;
import org.apache.openjpa.jdbc.meta.MappingInfo;
import org.apache.openjpa.jdbc.meta.ValueMapping;
import org.apache.openjpa.jdbc.meta.ValueMappingImpl;
import org.apache.openjpa.jdbc.meta.ValueMappingInfo;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.schema.ColumnIO;
import org.apache.openjpa.jdbc.schema.ForeignKey;
import org.apache.openjpa.jdbc.schema.PrimaryKey;
import org.apache.openjpa.jdbc.schema.Table;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.jdbc.sql.Joins;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.Row;
import org.apache.openjpa.jdbc.sql.RowManager;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.jdbc.sql.SelectExecutor;
import org.apache.openjpa.jdbc.sql.Union;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.kernel.StateManagerImpl;
import org.apache.openjpa.lib.log.Log;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.meta.FieldMetaData;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.util.ApplicationIds;
import org.apache.openjpa.util.ImplHelper;
import org.apache.openjpa.util.InternalException;
import org.apache.openjpa.util.MetaDataException;
import org.apache.openjpa.util.ObjectId;
import org.apache.openjpa.util.OpenJPAId;
import org.apache.openjpa.util.UnsupportedException;
/**
* Mapping for a single-valued relation to another entity.
*
* @author Abe White
* @since 0.4.0
*/
public class RelationFieldStrategy
extends AbstractFieldStrategy
implements Joinable, Embeddable {
private static final Localizer _loc = Localizer.forPackage
(RelationFieldStrategy.class);
private Boolean _fkOid = null;
public void map(boolean adapt) {
if (field.getTypeCode() != JavaTypes.PC || field.isEmbeddedPC())
throw new MetaDataException(_loc.get("not-relation", field));
field.getKeyMapping().getValueInfo().assertNoSchemaComponents
(field.getKey(), !adapt);
if (!field.isNonDefaultMappingUsingJoinTableStrategy())
field.getElementMapping().getValueInfo().assertNoSchemaComponents
(field.getElement(), !adapt);
boolean criteria = field.getValueInfo().getUseClassCriteria();
// check for named inverse
FieldMapping mapped = field.getMappedByMapping();
if (mapped != null) {
field.getMappingInfo().assertNoSchemaComponents(field, !adapt);
field.getValueInfo().assertNoSchemaComponents(field, !adapt);
mapped.resolve(mapped.MODE_META | mapped.MODE_MAPPING);
if (!mapped.isMapped() || mapped.isSerialized())
throw new MetaDataException(_loc.get("mapped-by-unmapped",
field, mapped));
if (mapped.getTypeCode() == JavaTypes.PC) {
if (mapped.getJoinDirection() == mapped.JOIN_FORWARD) {
field.setJoinDirection(field.JOIN_INVERSE);
field.setColumns(mapped.getDefiningMapping().
getPrimaryKeyColumns());
} else if (isTypeUnjoinedSubclass(mapped))
throw new MetaDataException(_loc.get
("mapped-inverse-unjoined", field.getName(),
field.getDefiningMapping(), mapped));
field.setForeignKey(mapped.getForeignKey
(field.getDefiningMapping()));
} else if (mapped.getElement().getTypeCode() == JavaTypes.PC) {
if (isTypeUnjoinedSubclass(mapped.getElementMapping()))
throw new MetaDataException(_loc.get
("mapped-inverse-unjoined", field.getName(),
field.getDefiningMapping(), mapped));
// warn the user about making the collection side the owner
Log log = field.getRepository().getLog();
if (log.isInfoEnabled())
log.info(_loc.get("coll-owner", field, mapped));
field.setForeignKey(mapped.getElementMapping().
getForeignKey());
} else
throw new MetaDataException(_loc.get("not-inv-relation",
field, mapped));
field.setUseClassCriteria(criteria);
return;
}
// this is necessary to support openjpa 3 mappings, which didn't
// differentiate between secondary table joins and relations built
// around an inverse key: check to see if we're mapped as a secondary
// table join but we're in the table of the related type, and if so
// switch our join mapping info to our value mapping info
DBIdentifier tableName = field.getMappingInfo().getTableIdentifier();
Table table = field.getTypeMapping().getTable();
ValueMappingInfo vinfo = field.getValueInfo();
if (!DBIdentifier.isNull(tableName) && table != null
&& (tableName.equals(table.getIdentifier())
|| tableName.equals(table.getFullIdentifier()))) {
vinfo.setJoinDirection(MappingInfo.JOIN_INVERSE);
vinfo.setColumns(field.getMappingInfo().getColumns());
field.getMappingInfo().setTableIdentifier(DBIdentifier.NULL);
field.getMappingInfo().setColumns(null);
}
if (!field.isBiMTo1JT())
field.mapJoin(adapt, false);
if (field.getTypeMapping().isMapped()) {
if (field.getMappedByIdValue() != null)
setMappedByIdColumns();
if (!field.isBiMTo1JT()) {
ForeignKey fk = vinfo.getTypeJoin(field, field.getName(), true,
adapt);
field.setForeignKey(fk);
}
field.setColumnIO(vinfo.getColumnIO());
if (vinfo.getJoinDirection() == vinfo.JOIN_INVERSE)
field.setJoinDirection(field.JOIN_INVERSE);
} else
RelationStrategies.mapRelationToUnmappedPC(field, field.getName(),
adapt);
field.setUseClassCriteria(criteria);
field.mapPrimaryKey(adapt);
PrimaryKey pk = field.getTable().getPrimaryKey();
if (field.isPrimaryKey()) {
Column[] cols = field.getColumns();
if (pk != null && (adapt || pk.isLogical()))
for (int i = 0; i < cols.length; i++)
pk.addColumn(cols[i]);
for (int i = 0; i < cols.length; i++)
field.getDefiningMapping().setJoinable(cols[i], this);
}
// map constraints after pk so we don't re-index / re-unique pk col
field.mapConstraints(field.getName(), adapt);
}
/**
* When there is MappedById annotation, the owner of the one-to-one/
* many-to-one relationship will use its primary key to represent
* foreign key relation. No need to create a separate foreign key
* column.
*/
private void setMappedByIdColumns() {
ClassMetaData owner = field.getDefiningMetaData();
FieldMetaData[] pks = owner.getPrimaryKeyFields();
for (int i = 0; i < pks.length; i++) {
FieldMapping fm = (FieldMapping) pks[i];
ValueMappingImpl val = (ValueMappingImpl) field.getValue();
ValueMappingInfo info = val.getValueInfo();
if (info.getColumns().size() == 0)
info.setColumns(getMappedByIdColumns(fm));
}
}
private List getMappedByIdColumns(FieldMapping pk) {
ClassMetaData embeddedId = ((ValueMappingImpl)pk.getValue()).
getEmbeddedMetaData();
Column[] pkCols = null;
List cols = new ArrayList();
String mappedByIdValue = field.getMappedByIdValue();
if (embeddedId != null) {
FieldMetaData[] fmds = embeddedId.getFields();
for (int i = 0; i < fmds.length; i++) {
if ((fmds[i].getName().equals(mappedByIdValue)) ||
mappedByIdValue.length() == 0) {
if (fmds[i].getValue().getEmbeddedMetaData() != null) {
EmbedValueHandler.getEmbeddedIdCols(
(FieldMapping)fmds[i], cols);
} else
EmbedValueHandler.getIdColumns(
(FieldMapping)fmds[i], cols);
}
}
return cols;
} else { // primary key is single-value
Class pkType = pk.getDeclaredType();
FieldMetaData[] pks = field.getValue().getDeclaredTypeMetaData().
getPrimaryKeyFields();
if (pks.length != 1 || pks[0].getDeclaredType() != pkType)
return Collections.EMPTY_LIST;
pkCols = pk.getColumns();
for (int i = 0; i < pkCols.length; i++)
cols.add(pkCols[i]);
return cols;
}
}
/**
* Return whether our defining mapping is an unjoined subclass of
* the type of the given value.
*/
private boolean isTypeUnjoinedSubclass(ValueMapping mapped) {
ClassMapping def = field.getDefiningMapping();
for (; def != null; def = def.getJoinablePCSuperclassMapping())
if (def == mapped.getTypeMapping())
return false;
return true;
}
public void initialize() {
field.setUsesIntermediate(true);
ForeignKey fk = field.getForeignKey();
if (fk == null)
_fkOid = Boolean.TRUE;
else if (field.getJoinDirection() != FieldMapping.JOIN_INVERSE)
_fkOid = field.getTypeMapping().isForeignKeyObjectId(fk);
}
public void insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
if (field.getMappedBy() != null)
return;
Row row = null;
OpenJPAStateManager rel = RelationStrategies.getStateManager
(sm.fetchObjectField(field.getIndex()), store.getContext());
// Checks if the field being inserted is a MapsId field and
// the related object is using auto-assigned identity
// If the above conditions are satisfied and the related instance has
// already been inserted in the RowManger, then returns without further
// processing
if (sm instanceof StateManagerImpl) {
List mappedByIdFields = ((StateManagerImpl)sm).getMappedByIdFields();
if (rel != null && ((ClassMapping)rel.getMetaData()).getTable().getAutoAssignedColumns().length > 0
&& mappedByIdFields!= null && mappedByIdFields.contains(field)) {
row = rm.getRow(((ClassMapping)rel.getMetaData()).getTable(), Row.ACTION_INSERT, rel, false);
if (row != null) return;
}
}
if (field.getJoinDirection() == FieldMapping.JOIN_INVERSE)
updateInverse(sm, rel, store, rm);
else {
if (row == null) row = field.getRow(sm, store, rm, Row.ACTION_INSERT);
if (row != null && !field.isBiMTo1JT()) {
field.setForeignKey(row, rel);
// this is for bi-directional maps, the key and value of the
// map are stored in the table of the mapped-by entity
setMapKey(sm, rel, store, row);
}
}
}
private void setMapKey(OpenJPAStateManager sm, OpenJPAStateManager rel,
JDBCStore store, Row row) throws SQLException {
if (rel == null)
return;
ClassMetaData meta = rel.getMetaData();
FieldMapping mapField = getMapField(meta);
// there is no bi-directional map field
if (mapField == null)
return;
Map mapObj = (Map)rel.fetchObjectField(mapField.getIndex());
Object keyObj = getMapKeyObj(mapObj, sm.getPersistenceCapable());
ValueMapping key = mapField.getKeyMapping();
if (!key.isEmbedded()) {
if (keyObj instanceof PersistenceCapable) {
OpenJPAStateManager keySm = RelationStrategies.
getStateManager(keyObj, store.getContext());
// key is an entity
ForeignKey fk = mapField.getKeyMapping().
getForeignKey();
ColumnIO io = new ColumnIO();
row.setForeignKey(fk, io, keySm);
}
} else {
// key is an embeddable or basic type
FieldStrategy strategy = mapField.getStrategy();
if (strategy instanceof
HandlerRelationMapTableFieldStrategy) {
HandlerRelationMapTableFieldStrategy strat =
(HandlerRelationMapTableFieldStrategy) strategy;
Column[] kcols = strat.getKeyColumns((ClassMapping)meta);
ColumnIO kio = strat.getKeyColumnIO();
HandlerStrategies.set(key, keyObj, store, row, kcols,
kio, true);
}
}
}
private FieldMapping getMapField(ClassMetaData meta) {
FieldMapping[] fields = ((ClassMapping)meta).getFieldMappings();
for (int i = 0; i < fields.length; i++) {
FieldMetaData mappedBy = fields[i].getMappedByMetaData();
if (fields[i].getDeclaredTypeCode() == JavaTypes.MAP &&
mappedBy == field)
return fields[i];
}
return null;
}
private Object getMapKeyObj(Map mapObj, Object value) {
if (value instanceof ReflectingPersistenceCapable)
value = ((ReflectingPersistenceCapable)value).getManagedInstance();
Set entries = mapObj.entrySet();
for (Map.Entry entry : entries) {
if (entry.getValue() == value)
return entry.getKey();
}
return null;
}
public void update(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
if (field.getMappedBy() != null)
return;
OpenJPAStateManager rel = RelationStrategies.getStateManager
(sm.fetchObjectField(field.getIndex()), store.getContext());
if (field.getJoinDirection() == field.JOIN_INVERSE) {
nullInverse(sm, rm);
updateInverse(sm, rel, store, rm);
} else {
int action = (rel == null &&
field.isBidirectionalJoinTableMappingNonOwner()) ?
Row.ACTION_DELETE : Row.ACTION_UPDATE;
Row row = field.getRow(sm, store, rm, action);
if (row != null && !field.isBiMTo1JT()) {
field.setForeignKey(row, rel);
// this is for bi-directional maps, the key and value of the
// map are stored in the table of the mapped-by entity
setMapKey(sm, rel, store, row);
}
if (field.isBiMTo1JT()) { // also need to update the join table
PersistenceCapable invPC = (PersistenceCapable)sm.fetchObject(
field.getBi_1ToM_JTField().getIndex());
Row secondaryRow = null;
if (invPC != null) {
secondaryRow = rm.getSecondaryRow(field.getBi1ToMJoinFK().getTable(),
Row.ACTION_INSERT);
secondaryRow.setForeignKey(field.getBi1ToMElemFK(), null, sm);
secondaryRow.setForeignKey(field.getBi1ToMJoinFK(), null,
RelationStrategies.getStateManager(invPC,
store.getContext()));
rm.flushSecondaryRow(secondaryRow);
}
}
}
}
public void delete(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
if (field.getMappedBy() != null)
return;
if (field.getJoinDirection() == field.JOIN_INVERSE) {
if (sm.getLoaded().get(field.getIndex())) {
OpenJPAStateManager rel = RelationStrategies.getStateManager(sm.
fetchObjectField(field.getIndex()), store.getContext());
updateInverse(sm, rel, store, rm);
} else
nullInverse(sm, rm);
} else {
field.deleteRow(sm, store, rm);
// if our foreign key has a delete action, we need to set the
// related object so constraints can be evaluated
Object lastRelPc = sm.fetchObjectField(field.getIndex());
if( lastRelPc == null) {
lastRelPc = sm.fetchInitialField(field.getIndex());
}
OpenJPAStateManager rel = RelationStrategies.getStateManager
(lastRelPc, store.getContext());
if (rel != null) {
ForeignKey fk = field.getForeignKey((ClassMapping)
rel.getMetaData());
if (fk.getDeleteAction() == ForeignKey.ACTION_RESTRICT ||
fk.getDeleteAction() == ForeignKey.ACTION_CASCADE) {
Row row = field.getRow(sm, store, rm, Row.ACTION_DELETE);
row.setForeignKey(fk, null, rel);
// this is for bi-directional maps, the key and value of the
// map are stored in the table of the mapped-by entity
setMapKey(sm, rel, store, row);
}
}
}
}
/**
* Null inverse relations that reference the given object.
*/
private void nullInverse(OpenJPAStateManager sm, RowManager rm)
throws SQLException {
if (field.getUseClassCriteria())
return;
ForeignKey fk = field.getForeignKey();
ColumnIO io = field.getColumnIO();
if (!io.isAnyUpdatable(fk, true))
return;
// null inverse if not already enforced by fk
if (field.getIndependentTypeMappings().length != 1)
throw RelationStrategies.uninversable(field);
Row row = rm.getAllRows(fk.getTable(), Row.ACTION_UPDATE);
row.setForeignKey(fk, io, null);
row.whereForeignKey(fk, sm);
rm.flushAllRows(row);
}
/**
* This method updates the inverse columns of our relation
* with the given object.
*/
private void updateInverse(OpenJPAStateManager sm, OpenJPAStateManager rel,
JDBCStore store, RowManager rm)
throws SQLException {
if (rel == null)
return;
ForeignKey fk = field.getForeignKey();
ColumnIO io = field.getColumnIO();
int action;
if (rel.isNew() && !rel.isFlushed()) {
if (sm.isDeleted() || !io.isAnyInsertable(fk, false))
return;
action = Row.ACTION_INSERT;
} else if (rel.isDeleted()) {
if (rel.isFlushed() || !sm.isDeleted())
return;
action = Row.ACTION_DELETE;
} else {
if (sm.isDeleted())
sm = null;
if (!io.isAnyUpdatable(fk, sm == null))
return;
action = Row.ACTION_UPDATE;
}
if (field.getIndependentTypeMappings().length != 1)
throw RelationStrategies.uninversable(field);
// get the row for the inverse object; the row might be in a secondary
// table if there is a field controlling the foreign key
Row row = null;
FieldMapping[] invs = field.getInverseMappings();
for (int i = 0; i < invs.length; i++) {
if (invs[i].getMappedByMetaData() == field
&& invs[i].getTypeCode() == JavaTypes.PC) {
row = invs[i].getRow(rel, store, rm, action);
break;
}
}
ClassMapping relMapping = field.getTypeMapping();
if (row == null)
row = rm.getRow(relMapping.getTable(), action, rel, true);
// if this is an update, this might be the only mod to the row, so
// make sure the where condition is set
if (action == Row.ACTION_UPDATE
&& row.getTable() == relMapping.getTable())
row.wherePrimaryKey(rel);
// update the inverse pointer with our oid value
row.setForeignKey(fk, io, sm);
}
public int supportsSelect(Select sel, int type, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch) {
if (type == Select.TYPE_JOINLESS)
return (field.getJoinDirection() != field.JOIN_INVERSE
&& sel.isSelected(field.getTable())) ? 1 : 0;
if (type == Select.TYPE_TWO_PART)
return 1;
// already cached?
if (sm != null) {
Object oid = sm.getIntermediate(field.getIndex());
if (store.getContext().findCached(oid, null) != null)
return 0;
}
ClassMapping[] clss = field.getIndependentTypeMappings();
switch (type) {
case Select.EAGER_PARALLEL:
return clss.length;
case Select.EAGER_OUTER:
return (clss.length == 1 && store.getDBDictionary().canOuterJoin
(sel.getJoinSyntax(), field.getForeignKey(clss[0]))) ? 1 :
0;
case Select.EAGER_INNER:
return (clss.length == 1) ? 1 : 0;
default:
return 0;
}
}
public void selectEagerParallel(SelectExecutor sel,
final OpenJPAStateManager sm, final JDBCStore store,
final JDBCFetchConfiguration fetch, final int eagerMode) {
final ClassMapping[] clss = field.getIndependentTypeMappings();
if (!(sel instanceof Union))
selectEagerParallel((Select) sel, clss[0], store, fetch, eagerMode);
else {
Union union = (Union) sel;
if (fetch.getSubclassFetchMode (field.getTypeMapping())
!= JDBCFetchConfiguration.EAGER_JOIN)
union.abortUnion();
union.select(new Union.Selector() {
public void select(Select sel, int idx) {
selectEagerParallel(sel, clss[idx], store, fetch,
eagerMode);
}
});
}
}
/**
* Perform an eager parallel select.
*/
private void selectEagerParallel(Select sel, ClassMapping cls,
JDBCStore store, JDBCFetchConfiguration fetch, int eagerMode) {
if (field.isBiMTo1JT())
return;
sel.selectPrimaryKey(field.getDefiningMapping());
// set a variable name that does not conflict with any in the query;
// using a variable guarantees that the selected data will use different
// aliases and joins than any existing WHERE conditions on this field
// that might otherwise limit the relations that match
Joins joins = sel.newJoins().setVariable("*");
eagerJoin(joins, cls, true);
sel.select(cls, field.getSelectSubclasses(), store, fetch, eagerMode,
joins);
}
public void selectEagerJoin(Select sel, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch, int eagerMode) {
if (field.isBiMTo1JT())
return;
// limit the eager mode to single on recursive eager fetching b/c
// at this point the select has been modified and an attempt to
// clone it for a to-many eager select can result in a clone that
// produces invalid SQL
ClassMapping cls = field.getIndependentTypeMappings()[0];
boolean forceInner = fetch.hasFetchInnerJoin(field.getFullName(false)) ?
true : false;
sel.select(cls, field.getSelectSubclasses(), store, fetch,
JDBCFetchConfiguration.EAGER_JOIN,
eagerJoin(sel.newJoins(), cls, forceInner));
}
/**
* Add the joins needed to select/load eager data.
*/
private Joins eagerJoin(Joins joins, ClassMapping cls, boolean forceInner) {
boolean inverse = field.getJoinDirection() == field.JOIN_INVERSE;
if (!inverse) {
joins = join(joins, false);
joins = setEmbeddedVariable(joins);
}
// and join into relation
ForeignKey fk = field.getForeignKey(cls);
if (!forceInner && field.getNullValue() != FieldMapping.NULL_EXCEPTION)
return joins.outerJoinRelation(field.getName(), fk, field.
getTypeMapping(), field.getSelectSubclasses(), inverse, false);
return joins.joinRelation(field.getName(), fk, field.getTypeMapping(),
field.getSelectSubclasses(), inverse, false);
}
/**
* If joining from an embedded owner, use variable to create a unique
* alias in case owner contains other same-typed embedded relations.
*/
private Joins setEmbeddedVariable(Joins joins) {
if (field.getDefiningMetaData().getEmbeddingMetaData() == null)
return joins;
return joins.setVariable(field.getDefiningMetaData().
getEmbeddingMetaData().getFieldMetaData().getName());
}
public int select(Select sel, OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, int eagerMode) {
if (field.getJoinDirection() == field.JOIN_INVERSE)
return -1;
// already cached oid?
if (sm != null && sm.getIntermediate(field.getIndex()) != null)
return -1;
if (!Boolean.TRUE.equals(_fkOid))
return -1;
sel.select(field.getColumns(), field.join(sel));
return 0;
}
public Object loadEagerParallel(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Object res)
throws SQLException {
// process batched results if we haven't already
Map rels;
if (res instanceof Result)
rels = processEagerParallelResult(sm, store, fetch, (Result) res);
else
rels = (Map) res;
// store object for this oid in instance
sm.storeObject(field.getIndex(), rels.remove(sm.getObjectId()));
return rels;
}
/**
* Process the given batched result.
*/
private Map processEagerParallelResult(OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch, Result res)
throws SQLException {
// do same joins as for load
//### cheat: we know typical result joins only care about the relation
//### path; thus we can ignore different mappings
ClassMapping[] clss = field.getIndependentTypeMappings();
Joins joins = res.newJoins().setVariable("*");
eagerJoin(joins, clss[0], true);
Map rels = new HashMap();
ClassMapping owner = field.getDefiningMapping();
ClassMapping cls;
Object oid;
while (res.next()) {
cls = res.getBaseMapping();
if (cls == null)
cls = clss[0];
oid = owner.getObjectId(store, res, null, true, null);
rels.put(oid, res.load(cls, store, fetch, joins));
}
res.close();
return rels;
}
public void loadEagerJoin(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res)
throws SQLException {
if (field.isBiMTo1JT())
return;
ClassMapping cls = field.getIndependentTypeMappings()[0];
// for inverseEager field
FieldMapping mappedByFieldMapping = field.getMappedByMapping();
PersistenceCapable mappedByValue = null;
if (mappedByFieldMapping != null) {
ValueMapping val = mappedByFieldMapping.getValueMapping();
ClassMetaData decMeta = val.getTypeMetaData();
// eager loading a child from its toOne parent and
// the parent has @OneToOne(mappedBy="parent") child relation.
// By saving the mapped-by info in 'res' is to
// avoid unneeded SQL pushdown that would otherwise gets
// generated.
if (decMeta != null && !sm.isEmbedded()) {
mappedByValue = sm.getPersistenceCapable();
res.setMappedByFieldMapping(mappedByFieldMapping);
res.setMappedByValue(mappedByValue);
}
}
boolean isLocked = res.isLocking();
try {
if (store.getLockManager() != null)
res.setLocking(store.getLockManager().skipRelationFieldLock());
sm.storeObject(field.getIndex(), res.load(cls, store, fetch,
eagerJoin(res.newJoins(), cls, false)));
} finally {
res.setLocking(isLocked);
}
// reset mapped by is needed for OneToOne bidirectional relations
// having a mapped-by parent to correctly set the parent-child
// relation.
res.setMappedByFieldMapping(null);
res.setMappedByValue(null);
}
public void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res)
throws SQLException {
if (field.getJoinDirection() == field.JOIN_INVERSE)
return;
// cached oid?
if (sm != null && sm.getIntermediate(field.getIndex()) != null)
return;
if (!Boolean.TRUE.equals(_fkOid))
return;
if (!res.containsAll(field.getColumns()))
return;
// get the related object's oid
ClassMapping relMapping = field.getTypeMapping();
Object oid = null;
if (relMapping.isMapped() && !field.isBiMTo1JT()) {
oid = relMapping.getObjectId(store, res, field.getForeignKey(),
field.getPolymorphic() != ValueMapping.POLY_FALSE, null);
} else {
Column[] cols = field.getColumns();
if (relMapping.getIdentityType() == ClassMapping.ID_DATASTORE) {
long id = res.getLong(cols[0]);
if (!res.wasNull())
oid = store.newDataStoreId(id, relMapping, true);
} else {
// application id
if (cols.length == 1) {
Object val = res.getObject(cols[0], null, null);
if (val != null)
oid = ApplicationIds.fromPKValues(new Object[]{ val },
relMapping);
} else {
Object[] vals = new Object[cols.length];
for (int i = 0; i < cols.length; i++) {
vals[i] = res.getObject(cols[i], null, null);
if (vals[i] == null)
break;
if (i == cols.length - 1)
oid = ApplicationIds.fromPKValues(vals, relMapping);
}
}
}
}
if (oid == null)
sm.storeObject(field.getIndex(), null);
else
sm.setIntermediate(field.getIndex(), oid);
}
public void load(final OpenJPAStateManager sm, final JDBCStore store,
final JDBCFetchConfiguration fetch)
throws SQLException {
// check for cached oid value, or load oid if no way to join
if (Boolean.TRUE.equals(_fkOid)) {
Object oid = sm.getIntermediate(field.getIndex());
if (oid != null) {
Object val = store.find(oid, field, fetch);
sm.storeObject(field.getIndex(), val);
return;
}
}
final ClassMapping[] rels = field.getIndependentTypeMappings();
final int subs = field.getSelectSubclasses();
final Joins[] resJoins = new Joins[rels.length];
// select related mapping columns; joining from the related type
// back to our fk table if not an inverse mapping (in which case we
// can just make sure the inverse cols == our pk values)
Union union = store.getSQLFactory().newUnion(rels.length);
union.setExpectedResultCount(1, false);
if (fetch.getSubclassFetchMode(field.getTypeMapping())
!= JDBCFetchConfiguration.EAGER_JOIN)
union.abortUnion();
union.select(new Union.Selector() {
public void select(Select sel, int idx) {
if (field.getJoinDirection() == field.JOIN_INVERSE)
sel.whereForeignKey(field.getForeignKey(rels[idx]),
sm.getObjectId(), field.getDefiningMapping(), store);
else {
if (!field.isBiMTo1JT()) {
resJoins[idx] = sel.newJoins().joinRelation(field.getName(),
field.getForeignKey(rels[idx]), rels[idx],
field.getSelectSubclasses(), false, false);
field.wherePrimaryKey(sel, sm, store);
} else {
resJoins[idx] = sel.newJoins().joinRelation(null,
field.getBi1ToMJoinFK(), rels[idx],
field.getSelectSubclasses(), false, false);
sel.whereForeignKey(field.getBi1ToMElemFK(), sm.getObjectId(),
field.getDefiningMapping(), store);
}
}
sel.select(rels[idx], subs, store, fetch, fetch.EAGER_JOIN,
resJoins[idx]);
}
});
Result res = union.execute(store, fetch);
try {
Object val = null;
if (res.next())
val = res.load(rels[res.indexOf()], store, fetch,
resJoins[res.indexOf()]);
sm.storeObject(field.getIndex(), val);
} finally {
res.close();
}
}
public Object toDataStoreValue(Object val, JDBCStore store) {
return RelationStrategies.toDataStoreValue(field, val, store);
}
public void appendIsNull(SQLBuffer sql, Select sel, Joins joins) {
// if no inverse, just join to mapping's table (usually a no-op
// because it'll be in the primary table) and see if fk cols are null;
// if inverse, then we have to do a sub-select to see if any inverse
// objects point back to this field's owner
if (field.getJoinDirection() != field.JOIN_INVERSE) {
//### probably need some sort of subselect here on fk constants
joins = join(joins, false);
Column[] cols = field.getColumns();
if (cols.length == 0)
sql.append("1 <> 1");
else
sql.append(sel.getColumnAlias(cols[0], joins)).
append(" IS ").appendValue(null, cols[0]);
} else
testInverseNull(sql, sel, joins, true);
}
public void appendIsNotNull(SQLBuffer sql, Select sel, Joins joins) {
// if no inverse, just join to mapping's table (usually a no-op
// because it'll be in the primary table) and see if fk cols aren't
// null; if inverse, then we have to do a sub-select to see if any
// inverse objects point back to this field's owner
if (field.getJoinDirection() != field.JOIN_INVERSE) {
//### probably need some sort of subselect here on fk constants
joins = join(joins, false);
Column[] cols = field.getColumns();
if (cols.length == 0)
sql.append("1 = 1");
else
sql.append(sel.getColumnAlias(cols[0], joins)).
append(" IS NOT ").appendValue(null, cols[0]);
} else
testInverseNull(sql, sel, joins, false);
}
/**
* Append SQL for a sub-select testing whether an inverse object exists
* for this relation.
*/
private void testInverseNull(SQLBuffer sql, Select sel, Joins joins,
boolean empty) {
DBDictionary dict = field.getMappingRepository().getDBDictionary();
dict.assertSupport(dict.supportsSubselect, "SupportsSubselect");
if (field.getIndependentTypeMappings().length != 1)
throw RelationStrategies.uninversable(field);
if (empty)
sql.append("0 = ");
else
sql.append("0 < ");
ForeignKey fk = field.getForeignKey();
ContainerFieldStrategy.appendJoinCount(sql, sel, joins, dict, field,
fk);
}
public Joins join(Joins joins, boolean forceOuter) {
// if we're not in an inverse object table join normally, otherwise
// already traversed the relation; just join back to owner table
if (field.getJoinDirection() != field.JOIN_INVERSE)
return field.join(joins, forceOuter, false);
ClassMapping[] clss = field.getIndependentTypeMappings();
if (clss.length != 1)
throw RelationStrategies.uninversable(field);
if (forceOuter)
return joins.outerJoinRelation(field.getName(),
field.getForeignKey(), clss[0], field.getSelectSubclasses(),
true, false);
return joins.joinRelation(field.getName(), field.getForeignKey(),
clss[0], field.getSelectSubclasses(), true, false);
}
public Joins joinRelation(Joins joins, boolean forceOuter,
boolean traverse) {
// if this is an inverse mapping it's already joined to the relation
if (field.getJoinDirection() == field.JOIN_INVERSE)
return joins;
ClassMapping[] clss = field.getIndependentTypeMappings();
if (clss.length != 1) {
if (traverse)
throw RelationStrategies.unjoinable(field);
return joins;
}
joins = setEmbeddedVariable(joins);
if (forceOuter)
return joins.outerJoinRelation(field.getName(),
field.getForeignKey(clss[0]), clss[0],
field.getSelectSubclasses(), false, false);
return joins.joinRelation(field.getName(), field.getForeignKey(clss[0]),
clss[0], field.getSelectSubclasses(), false, false);
}
///////////////////////////
// Joinable implementation
///////////////////////////
public int getFieldIndex() {
return field.getIndex();
}
public Object getPrimaryKeyValue(Result res, Column[] cols, ForeignKey fk,
JDBCStore store, Joins joins)
throws SQLException {
ClassMapping relmapping = field.getTypeMapping();
if (relmapping.getIdentityType() == ClassMapping.ID_DATASTORE) {
Column col = cols[0];
if (fk != null)
col = fk.getColumn(col);
long id = res.getLong(col, joins);
if (field.getObjectIdFieldTypeCode() == JavaTypes.LONG)
return id;
return store.newDataStoreId(id, relmapping, field.getPolymorphic()
!= ValueMapping.POLY_FALSE);
}
if (relmapping.isOpenJPAIdentity())
return ((Joinable) relmapping.getPrimaryKeyFieldMappings()[0].
getStrategy()).getPrimaryKeyValue(res, cols, fk, store, joins);
if (cols == getColumns() && fk == null)
fk = field.getForeignKey();
else
fk = createTranslatingForeignKey(relmapping, cols, fk);
return relmapping.getObjectId(store, res, fk,
field.getPolymorphic() != ValueMapping.POLY_FALSE, joins);
}
/**
* Create a faux foreign key that translates between the columns to pull
* the data from and our related type's primary key columns.
*/
private ForeignKey createTranslatingForeignKey(ClassMapping relmapping,
Column[] gcols, ForeignKey gfk) {
ForeignKey fk = field.getForeignKey();
Column[] cols = fk.getColumns();
ForeignKey tfk = null;
Column tcol;
for (int i = 0; i < gcols.length; i++) {
tcol = gcols[i];
if (gfk != null)
tcol = gfk.getColumn(tcol);
if (tfk == null)
tfk = new ForeignKey(DBIdentifier.NULL, tcol.getTable());
tfk.join(tcol, fk.getPrimaryKeyColumn(cols[i]));
}
return tfk;
}
public Object getJoinValue(Object fieldVal, Column col, JDBCStore store) {
Object o = field.getForeignKey().getConstant(col);
if (o != null)
return o;
col = field.getForeignKey().getPrimaryKeyColumn(col);
if (col == null)
throw new InternalException();
Object savedFieldVal = fieldVal;
ClassMapping relmapping = field.getTypeMapping();
Joinable j = field.getTypeMapping().assertJoinable(col);
if (ImplHelper.isManageable(fieldVal) && !field.getDefiningMetaData().useIdClassFromParent())
fieldVal = store.getContext().getObjectId(fieldVal);
if (fieldVal instanceof OpenJPAId)
fieldVal = ((OpenJPAId) fieldVal).getIdObject();
if (relmapping.getObjectIdType() != null
&& relmapping.getObjectIdType().isInstance(fieldVal)) {
Object[] pks = ApplicationIds.toPKValues(fieldVal, relmapping);
fieldVal = pks[relmapping.getField(j.getFieldIndex()).
getPrimaryKeyIndex()];
} else if (relmapping.getObjectIdType() == ObjectId.class &&
relmapping.getPrimaryKeyFieldMappings()[0].getValueMapping().isEmbedded()) {
if (fieldVal == null)
return j.getJoinValue(savedFieldVal, col, store);
return j.getJoinValue(fieldVal, col, store);
}
return j.getJoinValue(fieldVal, col, store);
}
public Object getJoinValue(OpenJPAStateManager sm, Column col,
JDBCStore store) {
return getJoinValue(sm.fetch(field.getIndex()), col, store);
}
public void setAutoAssignedValue(OpenJPAStateManager sm, JDBCStore store,
Column col, Object autoInc) {
throw new UnsupportedException();
}
/////////////////////////////
// Embeddable implementation
/////////////////////////////
public Column[] getColumns() {
return field.getColumns();
}
public ColumnIO getColumnIO() {
return field.getColumnIO();
}
public Object[] getResultArguments() {
return null;
}
public Object toEmbeddedDataStoreValue(Object val, JDBCStore store) {
return toDataStoreValue(val, store);
}
public Object toEmbeddedObjectValue(Object val) {
return UNSUPPORTED;
}
public void loadEmbedded(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Object val)
throws SQLException {
ClassMapping relMapping = field.getTypeMapping();
Object oid;
if (val == null)
oid = null;
else if (relMapping.getIdentityType() == ClassMapping.ID_DATASTORE)
oid = store.newDataStoreId(((Number) val).longValue(), relMapping,
field.getPolymorphic() != ValueMapping.POLY_FALSE);
else {
Object[] pks = (getColumns().length == 1) ? new Object[]{ val }
: (Object[]) val;
boolean nulls = true;
for (int i = 0; nulls && i < pks.length; i++)
nulls = pks[i] == null;
if (nulls)
oid = null;
else {
oid = ApplicationIds.fromPKValues(pks, relMapping);
if (field.getPolymorphic() == ValueMapping.POLY_FALSE
&& oid instanceof OpenJPAId) {
((OpenJPAId) oid).setManagedInstanceType(relMapping.
getDescribedType());
}
}
}
if (oid == null)
sm.storeObject(field.getIndex(), null);
else {
if (JavaTypes.maybePC(field.getValue()) &&
field.getElement().getEmbeddedMetaData() == null) {
Object obj = store.find(oid, field, fetch);
sm.storeObject(field.getIndex(), obj);
} else
sm.setIntermediate(field.getIndex(), oid);
}
}
}
