| /* |
| * 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.kernel.exps; |
| |
| import java.sql.SQLException; |
| |
| import org.apache.openjpa.jdbc.meta.ClassMapping; |
| import org.apache.openjpa.jdbc.meta.Joinable; |
| import org.apache.openjpa.jdbc.schema.Column; |
| import org.apache.openjpa.jdbc.sql.Result; |
| import org.apache.openjpa.jdbc.sql.SQLBuffer; |
| import org.apache.openjpa.jdbc.sql.Select; |
| import org.apache.openjpa.kernel.Filters; |
| import org.apache.openjpa.kernel.exps.ExpressionVisitor; |
| import org.apache.openjpa.lib.util.Localizer; |
| import org.apache.openjpa.meta.ClassMetaData; |
| import org.apache.openjpa.util.ApplicationIds; |
| import org.apache.openjpa.util.Id; |
| import org.apache.openjpa.util.OpenJPAId; |
| import org.apache.openjpa.util.UserException; |
| import serp.util.Numbers; |
| |
| /** |
| * Select the oid value of an object; typically used in projections. |
| * |
| * @author Abe White |
| */ |
| class GetObjectId |
| extends AbstractVal { |
| |
| private static final Localizer _loc = Localizer.forPackage |
| (GetObjectId.class); |
| |
| private final PCPath _path; |
| private ClassMetaData _meta = null; |
| |
| /** |
| * Constructor. Provide the value whose oid to extract. |
| */ |
| public GetObjectId(PCPath path) { |
| _path = path; |
| } |
| |
| /** |
| * Return the oid columns. |
| */ |
| public Column[] getColumns(ExpState state) { |
| return _path.getClassMapping(state).getPrimaryKeyColumns(); |
| } |
| |
| public ClassMetaData getMetaData() { |
| return _meta; |
| } |
| |
| public void setMetaData(ClassMetaData meta) { |
| _meta = meta; |
| } |
| |
| public Class getType() { |
| return Object.class; |
| } |
| |
| public void setImplicitType(Class type) { |
| } |
| |
| public ExpState initialize(Select sel, ExpContext ctx, int flags) { |
| ExpState state = _path.initialize(sel, ctx, JOIN_REL); |
| |
| // it's difficult to get calls on non-pc fields to always return null |
| // without screwing up the SQL, to just don't let users call it on |
| // non-pc fields at all |
| ClassMapping cls = _path.getClassMapping(state); |
| if (cls == null || cls.getEmbeddingMapping() != null) |
| throw new UserException(_loc.get("bad-getobjectid", |
| _path.getFieldMapping(state))); |
| return state; |
| } |
| |
| public Object toDataStoreValue(Select sel, ExpContext ctx, ExpState state, |
| Object val) { |
| // if datastore identity, try to convert to a long value |
| ClassMapping mapping = _path.getClassMapping(state); |
| if (mapping.getIdentityType() == mapping.ID_DATASTORE) { |
| if (val instanceof Id) |
| return Numbers.valueOf(((Id) val).getId()); |
| return Filters.convert(val, long.class); |
| } |
| |
| // if unknown identity, can't do much |
| if (mapping.getIdentityType() == mapping.ID_UNKNOWN) |
| return (val instanceof OpenJPAId) ? |
| ((OpenJPAId) val).getIdObject() : val; |
| |
| // application identity; convert to pk values in the same order as |
| // the mapping's primary key columns will be returned |
| Object[] pks = ApplicationIds.toPKValues(val, mapping); |
| if (pks.length == 1) |
| return pks[0]; |
| if (val == null) |
| return pks; |
| while (!mapping.isPrimaryKeyObjectId(false)) |
| mapping = mapping.getJoinablePCSuperclassMapping(); |
| |
| Column[] cols = mapping.getPrimaryKeyColumns(); |
| Object[] vals = new Object[cols.length]; |
| Joinable join; |
| for (int i = 0; i < cols.length; i++) { |
| join = mapping.assertJoinable(cols[i]); |
| vals[i] = pks[mapping.getField(join.getFieldIndex()). |
| getPrimaryKeyIndex()]; |
| vals[i] = join.getJoinValue(vals[i], cols[i], ctx.store); |
| } |
| return vals; |
| } |
| |
| public void select(Select sel, ExpContext ctx, ExpState state, |
| boolean pks) { |
| selectColumns(sel, ctx, state, true); |
| } |
| |
| public void selectColumns(Select sel, ExpContext ctx, ExpState state, |
| boolean pks) { |
| _path.selectColumns(sel, ctx, state, true); |
| } |
| |
| public void groupBy(Select sel, ExpContext ctx, ExpState state) { |
| _path.groupBy(sel, ctx, state); |
| } |
| |
| public void orderBy(Select sel, ExpContext ctx, ExpState state, |
| boolean asc) { |
| _path.orderBy(sel, ctx, state, asc); |
| } |
| |
| public Object load(ExpContext ctx, ExpState state, Result res) |
| throws SQLException { |
| return _path.load(ctx, state, res, true); |
| } |
| |
| public void calculateValue(Select sel, ExpContext ctx, ExpState state, |
| Val other, ExpState otherState) { |
| _path.calculateValue(sel, ctx, state, null, null); |
| } |
| |
| public int length(Select sel, ExpContext ctx, ExpState state) { |
| return _path.length(sel, ctx, state); |
| } |
| |
| public void appendTo(Select sel, ExpContext ctx, ExpState state, |
| SQLBuffer sql, int index) { |
| _path.appendTo(sel, ctx, state, sql, index); |
| } |
| |
| public void acceptVisit(ExpressionVisitor visitor) { |
| visitor.enter(this); |
| _path.acceptVisit(visitor); |
| visitor.exit(this); |
| } |
| } |
| |