| /* |
| * 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.jdbc.kernel.EagerFetchModes; |
| 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.ValueMapping; |
| import org.apache.openjpa.jdbc.schema.Column; |
| 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.Select; |
| import org.apache.openjpa.jdbc.sql.Union; |
| import org.apache.openjpa.kernel.OpenJPAStateManager; |
| import org.apache.openjpa.lib.util.Localizer; |
| import org.apache.openjpa.meta.JavaTypes; |
| import org.apache.openjpa.util.InternalException; |
| import org.apache.openjpa.util.MetaDataException; |
| import org.apache.openjpa.util.Proxy; |
| |
| /** |
| * Uses an inverse foreign key in the table of the map value to determine |
| * map values. Derives map keys from a field in each value. |
| * |
| * @author Abe White |
| */ |
| public class RelationMapInverseKeyFieldStrategy |
| extends RelationToManyInverseKeyFieldStrategy |
| implements LRSMapFieldStrategy { |
| |
| |
| private static final long serialVersionUID = 1L; |
| private static final Localizer _loc = Localizer.forPackage |
| (RelationMapInverseKeyFieldStrategy.class); |
| |
| @Override |
| public FieldMapping getFieldMapping() { |
| return field; |
| } |
| |
| @Override |
| public ClassMapping[] getIndependentKeyMappings(boolean traverse) { |
| return ClassMapping.EMPTY_MAPPINGS; |
| } |
| |
| @Override |
| public ClassMapping[] getIndependentValueMappings(boolean traverse) { |
| return getIndependentElementMappings(traverse); |
| } |
| |
| @Override |
| public Column[] getKeyColumns(ClassMapping cls) { |
| return cls.getFieldMapping(field.getKey(). |
| getValueMappedByMetaData().getIndex()).getColumns(); |
| } |
| |
| @Override |
| public Column[] getValueColumns(ClassMapping cls) { |
| return cls.getPrimaryKeyColumns(); |
| } |
| |
| @Override |
| public ForeignKey getJoinForeignKey(ClassMapping cls) { |
| return super.getJoinForeignKey(cls); |
| } |
| |
| @Override |
| public void selectKey(Select sel, ClassMapping key, OpenJPAStateManager sm, |
| JDBCStore store, JDBCFetchConfiguration fetch, Joins joins) { |
| ValueMapping vm = field.getKeyMapping(); |
| if (vm.isEmbedded()) |
| sel.select(key, field.getKeyMapping().getSelectSubclasses(), |
| store, fetch, EagerFetchModes.EAGER_NONE, joins); |
| else |
| throw new InternalException(); |
| } |
| |
| @Override |
| public Object loadKey(OpenJPAStateManager sm, JDBCStore store, |
| JDBCFetchConfiguration fetch, Result res, Joins joins) |
| throws SQLException { |
| ValueMapping vm = field.getKeyMapping(); |
| if (vm.isEmbedded()) |
| return vm.getValueMappedByMapping(). |
| loadProjection(store, fetch, res, joins); |
| else |
| throw new InternalException(); |
| } |
| |
| @Override |
| public Object deriveKey(JDBCStore store, Object value) { |
| OpenJPAStateManager sm = RelationStrategies.getStateManager(value, |
| store.getContext()); |
| return (sm == null) ? null : sm.fetchField(field.getKey(). |
| getValueMappedByMetaData().getIndex(), false); |
| } |
| |
| @Override |
| public Object deriveValue(JDBCStore store, Object key) { |
| return null; |
| } |
| |
| @Override |
| public void selectValue(Select sel, ClassMapping val, |
| OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, |
| Joins joins) { |
| selectElement(sel, val, store, fetch, EagerFetchModes.EAGER_NONE, |
| joins); |
| } |
| |
| @Override |
| public Object loadValue(OpenJPAStateManager sm, JDBCStore store, |
| JDBCFetchConfiguration fetch, Result res, Joins joins) |
| throws SQLException { |
| return loadElement(sm, store, fetch, res, joins); |
| } |
| |
| @Override |
| public Result[] getResults(final OpenJPAStateManager sm, |
| final JDBCStore store, final JDBCFetchConfiguration fetch, |
| final int eagerMode, final Joins[] joins, boolean lrs) |
| throws SQLException { |
| ValueMapping val = field.getElementMapping(); |
| final ClassMapping[] vals = val.getIndependentTypeMappings(); |
| Union union = store.getSQLFactory().newUnion(vals.length); |
| if (fetch.getSubclassFetchMode(val.getTypeMapping()) |
| != EagerFetchModes.EAGER_JOIN) |
| union.abortUnion(); |
| union.setLRS(lrs); |
| union.select(new Union.Selector() { |
| @Override |
| public void select(Select sel, int idx) { |
| joins[1] = selectAll(sel, vals[idx], sm, store, fetch, |
| eagerMode); |
| } |
| }); |
| Result res = union.execute(store, fetch); |
| return new Result[]{ res, res }; |
| } |
| |
| @Override |
| public Joins joinKeyRelation(Joins joins, ClassMapping key) { |
| return joins; |
| } |
| |
| @Override |
| public Joins joinKeyRelation(Joins joins, boolean forceOuter, |
| boolean traverse) { |
| ValueMapping key = field.getKeyMapping(); |
| if (key.isEmbedded()) |
| return joins; |
| |
| ClassMapping[] clss = key.getIndependentTypeMappings(); |
| if (clss.length != 1) { |
| if (traverse) |
| throw RelationStrategies.unjoinable(key); |
| return joins; |
| } |
| if (forceOuter) |
| return joins.outerJoinRelation(field.getName(), |
| key.getForeignKey(clss[0]), clss[0], key.getSelectSubclasses(), |
| false, false); |
| return joins.joinRelation(field.getName(), |
| key.getForeignKey(clss[0]), clss[0], key.getSelectSubclasses(), |
| false, false); |
| } |
| |
| @Override |
| public Joins joinValueRelation(Joins joins, ClassMapping val) { |
| return joinElementRelation(joins, val); |
| } |
| |
| @Override |
| protected Proxy newLRSProxy() { |
| return new LRSProxyMap(this); |
| } |
| |
| @Override |
| protected void add(JDBCStore store, Object coll, Object obj) { |
| if (obj != null) |
| ((Map) coll).put(deriveKey(store, obj), obj); |
| } |
| |
| @Override |
| protected Collection toCollection(Object val) { |
| return (val == null) ? null : ((Map) val).values(); |
| } |
| |
| @Override |
| 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("not-mapped-by-key", field)); |
| super.map(adapt); |
| } |
| |
| @Override |
| public Joins joinKey(Joins joins, boolean forceOuter) { |
| return joinRelation(join(joins, forceOuter), forceOuter, false); |
| } |
| } |