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org.apache.openjpa.jdbc.meta.strats.MapTableFieldStrategy 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.Map;
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.FieldMapping;
import org.apache.openjpa.jdbc.meta.FieldStrategy;
import org.apache.openjpa.jdbc.meta.Strategy;
import org.apache.openjpa.jdbc.meta.ValueMapping;
import org.apache.openjpa.jdbc.meta.ValueMappingInfo;
import org.apache.openjpa.jdbc.schema.ForeignKey;
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.RowImpl;
import org.apache.openjpa.jdbc.sql.RowManager;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.kernel.StoreContext;
import org.apache.openjpa.lib.log.Log;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.util.MetaDataException;
/**
* Base class for map mappings. Handles managing the secondary table
* used to hold map keys and values and loading. Subclasses must implement
* abstract methods and insert/update behavior as well as overriding
* {@link FieldStrategy#toDataStoreValue},
* {@link FieldStrategy#toKeyDataStoreValue},
* {@link FieldStrategy#joinRelation}, and
* {@link FieldStrategy#joinKeyRelation} if necessary.
*
* @author Abe White
*/
public abstract class MapTableFieldStrategy
extends ContainerFieldStrategy
implements LRSMapFieldStrategy {
private static final Localizer _loc = Localizer.forPackage
(MapTableFieldStrategy.class);
public FieldMapping getFieldMapping() {
return field;
}
public ClassMapping[] getIndependentKeyMappings(boolean traverse) {
return (traverse) ? field.getKeyMapping().getIndependentTypeMappings()
: ClassMapping.EMPTY_MAPPINGS;
}
public ClassMapping[] getIndependentValueMappings(boolean traverse) {
return (traverse) ? field.getElementMapping().
getIndependentTypeMappings() : ClassMapping.EMPTY_MAPPINGS;
}
public ForeignKey getJoinForeignKey(ClassMapping cls) {
return field.getJoinForeignKey();
}
public Object deriveKey(JDBCStore store, Object value) {
return null;
}
public Object deriveValue(JDBCStore store, Object key) {
return null;
}
/**
* Invokes {@link FieldStrategy#joinKeyRelation} by default.
*/
public Joins joinKeyRelation(Joins joins, ClassMapping key) {
return joinKeyRelation(joins, false, false);
}
/**
* Invokes {@link FieldStrategy#joinRelation} by default.
*/
public Joins joinValueRelation(Joins joins, ClassMapping val) {
return joinRelation(joins, false, false);
}
public void map(boolean adapt) {
if (field.getTypeCode() != JavaTypes.MAP)
throw new MetaDataException(_loc.get("not-map", field));
if (field.getKey().getValueMappedBy() != null)
throw new MetaDataException(_loc.get("mapped-by-key", field));
// Non-default mapping Uni-/OneToMany/ForeignKey allows schema components
if (field.isUni1ToMFK())
return;
if (field.isBiMTo1JT())
field.setBi1MJoinTableInfo();
field.getValueInfo().assertNoSchemaComponents(field, !adapt);
}
public void delete(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
Row row = rm.getAllRows(field.getTable(), Row.ACTION_DELETE);
row.whereForeignKey(field.getJoinForeignKey(), sm);
rm.flushAllRows(row);
}
public int supportsSelect(Select sel, int type, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch) {
return 0;
}
public void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch)
throws SQLException {
if (field.isLRS()) {
sm.storeObjectField(field.getIndex(), new LRSProxyMap(this));
return;
}
// select all and load into a normal proxy
Joins[] joins = new Joins[2];
Result[] res = getResults(sm, store, fetch,
JDBCFetchConfiguration.EAGER_PARALLEL, joins, false);
try {
Map map = (Map) sm.newProxy(field.getIndex());
Object key, val;
while (res[0].next()) {
if (res[1] != res[0] && !res[1].next())
break;
key = loadKey(sm, store, fetch, res[0], joins[0]);
val = loadValue(sm, store, fetch, res[1], joins[1]);
map.put(key, val);
}
sm.storeObject(field.getIndex(), map);
} finally {
res[0].close();
if (res[1] != res[0])
res[1].close();
}
}
public Object loadKeyProjection(JDBCStore store,
JDBCFetchConfiguration fetch, Result res, Joins joins)
throws SQLException {
return loadKey(null, store, fetch, res, joins);
}
public Object loadProjection(JDBCStore store, JDBCFetchConfiguration fetch,
Result res, Joins joins)
throws SQLException {
return loadValue(null, store, fetch, res, joins);
}
public Joins join(Joins joins, boolean forceOuter) {
return field.join(joins, forceOuter, true);
}
public Joins joinKey(Joins joins, boolean forceOuter) {
return field.join(joins, forceOuter, true);
}
public ForeignKey getJoinForeignKey() {
return field.getJoinForeignKey();
}
protected ClassMapping[] getIndependentElementMappings(boolean traverse) {
return ClassMapping.EMPTY_MAPPINGS;
}
protected void handleMappedByForeignKey(boolean adapt){
boolean criteria = field.getValueInfo().getUseClassCriteria();
// check for named inverse
FieldMapping mapped = field.getMappedByMapping();
if (mapped != null) {
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));
ForeignKey fk = mapped.getForeignKey(
field.getDefiningMapping());
field.setForeignKey(fk);
field.setJoinForeignKey(fk);
} 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));
ValueMapping elem = mapped.getElementMapping();
ForeignKey fk = elem.getForeignKey();
field.setJoinForeignKey(fk);
field.getElementMapping().setForeignKey(
mapped.getJoinForeignKey());
} else
throw new MetaDataException(_loc.get("not-inv-relation",
field, mapped));
field.setUseClassCriteria(criteria);
return;
} else {
// Uni-/OneToMany/ForeingKey
ValueMapping val = field.getElementMapping();
val.getValueInfo().setColumns(field.getValueInfo().getColumns());
if (val.getTypeMapping().isMapped()) {
ValueMappingInfo vinfo = val.getValueInfo();
ForeignKey fk = vinfo.getTypeJoin(val, DBIdentifier.NULL, false, adapt);
val.setForeignKey(fk);
val.setColumnIO(vinfo.getColumnIO());
} else
RelationStrategies.mapRelationToUnmappedPC(val, "value", adapt);
val.mapConstraints("value", adapt);
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
String tableName = field.getMappingInfo().getTableName();
Table table = field.getTypeMapping().getTable();
ValueMappingInfo vinfo = field.getValueInfo();
if (tableName != null && table != null
&& (tableName.equalsIgnoreCase(table.getName())
|| tableName.equalsIgnoreCase(table.getFullName()))) {
vinfo.setJoinDirection(MappingInfo.JOIN_INVERSE);
vinfo.setColumns(field.getMappingInfo().getColumns());
field.getMappingInfo().setTableName(null);
field.getMappingInfo().setColumns(null);
}
*/
}
protected boolean isTypeUnjoinedSubclass(ValueMapping mapped) {
ClassMapping def = field.getDefiningMapping();
for (; def != null; def = def.getJoinablePCSuperclassMapping())
if (def == mapped.getTypeMapping())
return false;
return true;
}
protected boolean populateKey(Row row, OpenJPAStateManager valsm,
Object obj, StoreContext ctx, RowManager rm, JDBCStore store)
throws SQLException {
ClassMapping meta = (ClassMapping)valsm.getMetaData();
FieldMapping fm = getFieldMapping(meta);
if (fm == null)
return false;
Map mapObj = (Map)valsm.fetchObject(fm.getIndex());
Collection entrySets = mapObj.entrySet();
boolean found = false;
for (Map.Entry entry : entrySets) {
Object value = entry.getValue();
if (obj instanceof ReflectingPersistenceCapable)
obj = ((ReflectingPersistenceCapable)obj).getManagedInstance();
if (value == obj) {
Row newRow = (Row) ((RowImpl)row).clone();
Object keyObj = entry.getKey();
Strategy strat = fm.getStrategy();
if (strat instanceof HandlerRelationMapTableFieldStrategy) {
HandlerRelationMapTableFieldStrategy hrStrat =
(HandlerRelationMapTableFieldStrategy) strat;
hrStrat.setKey(keyObj, store, newRow);
} else if (keyObj instanceof PersistenceCapable) {
OpenJPAStateManager keysm =
RelationStrategies.getStateManager(entry.getKey(), ctx);
ValueMapping key = fm.getKeyMapping();
if (keysm != null)
key.setForeignKey(newRow, keysm);
else
key.setForeignKey(newRow, null);
}
rm.flushSecondaryRow(newRow);
found = true;
}
}
if (found)
return true;
return false;
}
private FieldMapping getFieldMapping(ClassMapping meta) {
FieldMapping[] fields = meta.getFieldMappings();
for (int i = 0; i < fields.length; i++) {
ValueMapping val = fields[i].getValueMapping();
if (fields[i].getMappedByMetaData() == field &&
val.getDeclaredTypeCode() == JavaTypes.MAP)
return fields[i];
}
return null;
}
}
