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org.apache.openjpa.jdbc.meta.strats.HandlerHandlerMapTableFieldStrategy Maven / Gradle / Ivy
/*
* 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.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
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.ValueHandler;
import org.apache.openjpa.jdbc.meta.ValueMapping;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.schema.ColumnIO;
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.Select;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.util.ChangeTracker;
import org.apache.openjpa.util.MetaDataException;
import org.apache.openjpa.util.Proxies;
import org.apache.openjpa.util.Proxy;
/**
* Mapping for a map of keys and values both controlled by
* {@link ValueHandler}s.
*
* @author Abe White
* @since 0.4.0, 1.1.0
*/
public class HandlerHandlerMapTableFieldStrategy
extends MapTableFieldStrategy {
private static final long serialVersionUID = 1L;
private static final Localizer _loc = Localizer.forPackage
(HandlerHandlerMapTableFieldStrategy.class);
private Column[] _kcols = null;
private ColumnIO _kio = null;
private boolean _kload = false;
private Column[] _vcols = null;
private ColumnIO _vio = null;
private boolean _vload = false;
@Override
public Column[] getKeyColumns(ClassMapping cls) {
return _kcols;
}
@Override
public Column[] getValueColumns(ClassMapping cls) {
return _vcols;
}
@Override
public void selectKey(Select sel, ClassMapping cls, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch, Joins joins) {
sel.select(_kcols, joins);
}
@Override
public void selectValue(Select sel, ClassMapping cls,
OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch, Joins joins) {
sel.select(_vcols, joins);
}
@Override
public Result[] getResults(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, int eagerMode, Joins[] joins, boolean lrs)
throws SQLException {
Select sel = store.getSQLFactory().newSelect();
sel.setLRS(lrs);
sel.select(_kcols);
sel.select(_vcols);
sel.whereForeignKey(field.getJoinForeignKey(), sm.getObjectId(),
field.getDefiningMapping(), store);
Result res = sel.execute(store, fetch);
return new Result[]{ res, res };
}
@Override
public Object loadKey(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res, Joins joins)
throws SQLException {
return HandlerStrategies.loadObject(field.getKeyMapping(),
sm, store, fetch, res, joins, _kcols, _kload);
}
@Override
public Object loadValue(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res, Joins joins)
throws SQLException {
return HandlerStrategies.loadObject(field.getElementMapping(),
sm, store, fetch, res, joins, _vcols, _vload);
}
@Override
public void map(boolean adapt) {
super.map(adapt);
ValueMapping key = field.getKeyMapping();
if (key.getHandler() == null)
throw new MetaDataException(_loc.get("no-handler", key));
ValueMapping val = field.getElementMapping();
if (val.getHandler() == null)
throw new MetaDataException(_loc.get("no-handler", val));
assertNotMappedBy();
field.mapJoin(adapt, true);
_kio = new ColumnIO();
List columns = key.getValueInfo().getColumns();
DBDictionary dict = field.getMappingRepository().getDBDictionary();
DBIdentifier colName = dict.getValidColumnName(DBIdentifier.newColumn("key"), field.getTable());
_kcols = HandlerStrategies.map(key, colName.getName(), _kio, adapt);
_vio = new ColumnIO();
_vcols = HandlerStrategies.map(val, "value", _vio, adapt);
field.mapPrimaryKey(adapt);
}
@Override
public void initialize() {
_kload = field.getKeyMapping().getHandler().
objectValueRequiresLoad(field.getKeyMapping());
_vload = field.getElementMapping().getHandler().
objectValueRequiresLoad(field.getElementMapping());
}
@Override
public void insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
insert(sm, store, rm, (Map) sm.fetchObject(field.getIndex()));
}
private void insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm,
Map map)
throws SQLException {
if (map == null || map.isEmpty())
return;
Row row = rm.getSecondaryRow(field.getTable(), Row.ACTION_INSERT);
row.setForeignKey(field.getJoinForeignKey(), field.getJoinColumnIO(),
sm);
ValueMapping key = field.getKeyMapping();
ValueMapping val = field.getElementMapping();
Map.Entry entry;
for (Iterator itr = map.entrySet().iterator(); itr.hasNext();) {
entry = (Map.Entry) itr.next();
HandlerStrategies.set(key, entry.getKey(), store, row, _kcols,
_kio, true);
HandlerStrategies.set(val, entry.getValue(), store, row, _vcols,
_vio, true);
rm.flushSecondaryRow(row);
}
}
@Override
public void update(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
Map map = (Map) sm.fetchObject(field.getIndex());
ChangeTracker ct = null;
if (map instanceof Proxy) {
Proxy proxy = (Proxy) map;
if (Proxies.isOwner(proxy, sm, field.getIndex()))
ct = proxy.getChangeTracker();
}
// if no fine-grained change tracking then just delete and reinsert
if (ct == null || !ct.isTracking()) {
delete(sm, store, rm);
insert(sm, store, rm, map);
return;
}
// delete the removes
ValueMapping key = field.getKeyMapping();
Collection rem = ct.getRemoved();
if (!rem.isEmpty()) {
Row delRow = rm.getSecondaryRow(field.getTable(),
Row.ACTION_DELETE);
delRow.whereForeignKey(field.getJoinForeignKey(), sm);
for (Iterator itr = rem.iterator(); itr.hasNext();) {
HandlerStrategies.where(key, itr.next(), store, delRow,
_kcols);
rm.flushSecondaryRow(delRow);
}
}
// insert the adds
ValueMapping val = field.getElementMapping();
Collection add = ct.getAdded();
Object mkey;
if (!add.isEmpty()) {
Row addRow = rm.getSecondaryRow(field.getTable(),
Row.ACTION_INSERT);
addRow.setForeignKey(field.getJoinForeignKey(),
field.getJoinColumnIO(), sm);
for (Iterator itr = add.iterator(); itr.hasNext();) {
mkey = itr.next();
HandlerStrategies.set(key, mkey, store, addRow, _kcols,
_kio, true);
HandlerStrategies.set(val, map.get(mkey), store, addRow,
_vcols, _vio, true);
rm.flushSecondaryRow(addRow);
}
}
// update the changes
Collection change = ct.getChanged();
if (!change.isEmpty()) {
Row changeRow = rm.getSecondaryRow(field.getTable(),
Row.ACTION_UPDATE);
changeRow.whereForeignKey(field.getJoinForeignKey(), sm);
for (Iterator itr = change.iterator(); itr.hasNext();) {
mkey = itr.next();
HandlerStrategies.where(key, mkey, store, changeRow, _kcols);
HandlerStrategies.set(val, map.get(mkey), store, changeRow,
_vcols, _vio, true);
rm.flushSecondaryRow(changeRow);
}
}
}
@Override
public Object toDataStoreValue(Object val, JDBCStore store) {
return HandlerStrategies.toDataStoreValue(field.getElementMapping(),
val, _vcols, store);
}
@Override
public Object toKeyDataStoreValue(Object val, JDBCStore store) {
return HandlerStrategies.toDataStoreValue(field.getKeyMapping(), val,
_kcols, store);
}
@Override
public Joins joinRelation(Joins joins, boolean forceOuter,
boolean traverse) {
if (traverse)
HandlerStrategies.assertJoinable(field.getElementMapping());
return joins;
}
@Override
public Joins joinKeyRelation(Joins joins, boolean forceOuter,
boolean traverse) {
if (traverse)
HandlerStrategies.assertJoinable(field.getKeyMapping());
return joins;
}
}
