/*
* 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.isis.runtimes.dflt.objectstores.sql.auto;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.isis.core.commons.debug.DebugBuilder;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.metamodel.adapter.ResolveState;
import org.apache.isis.core.metamodel.adapter.oid.Oid;
import org.apache.isis.core.metamodel.adapter.version.SerialNumberVersion;
import org.apache.isis.core.metamodel.facets.collections.modify.CollectionFacet;
import org.apache.isis.core.metamodel.spec.feature.ObjectAssociation;
import org.apache.isis.runtimes.dflt.objectstores.sql.CollectionMapper;
import org.apache.isis.runtimes.dflt.objectstores.sql.DatabaseConnector;
import org.apache.isis.runtimes.dflt.objectstores.sql.FieldMappingLookup;
import org.apache.isis.runtimes.dflt.objectstores.sql.ObjectMappingLookup;
import org.apache.isis.runtimes.dflt.objectstores.sql.Results;
import org.apache.isis.runtimes.dflt.objectstores.sql.VersionMapping;
import org.apache.isis.runtimes.dflt.objectstores.sql.mapping.FieldMapping;
import org.apache.isis.runtimes.dflt.objectstores.sql.mapping.ObjectReferenceMapping;
import org.apache.isis.runtimes.dflt.runtime.persistence.PersistorUtil;
/**
* used where there is a one to many association, and the elements are only
* known to parent
*/
public class ReversedAutoAssociationMapper extends AbstractAutoMapper implements CollectionMapper {
private static final Logger LOG = Logger.getLogger(ReversedAutoAssociationMapper.class);
private final ObjectAssociation field;
private final ObjectReferenceMapping idMapping;
private final VersionMapping versionMapping;
public ReversedAutoAssociationMapper(final String elemenType, final ObjectAssociation field, final String parameterBase, final FieldMappingLookup lookup, final ObjectMappingLookup objectLookup) {
super(elemenType, parameterBase, lookup, objectLookup);
this.field = field;
idMapping = lookup.createMapping(field.getSpecification());
versionMapping = lookup.createVersionMapping();
setUpFieldMappers();
}
@Override
public void createTables(final DatabaseConnector connection) {
if (!connection.hasTable(table)) {
final StringBuffer sql = new StringBuffer();
sql.append("create table ");
sql.append(table);
sql.append(" (");
idMapping.appendColumnDefinitions(sql);
sql.append(", ");
for (final FieldMapping mapping : fieldMappings) {
mapping.appendColumnDefinitions(sql);
sql.append(",");
}
sql.append(versionMapping.appendColumnDefinitions());
sql.append(")");
connection.update(sql.toString());
}
for (int i = 0; collectionMappers != null && i < collectionMappers.length; i++) {
if (collectionMappers[i].needsTables(connection)) {
collectionMappers[i].createTables(connection);
}
}
}
@Override
public void loadInternalCollection(final DatabaseConnector connector, final ObjectAdapter parent, final boolean makeResolved) {
final ObjectAdapter collection = field.get(parent);
if (collection.getResolveState().canChangeTo(ResolveState.RESOLVING)) {
LOG.debug("loading internal collection " + field);
final StringBuffer sql = new StringBuffer();
sql.append("select ");
idMapping.appendColumnNames(sql);
sql.append(", ");
sql.append(columnList(fieldMappings));
sql.append(" from ");
sql.append(table);
sql.append(" where ");
idMapping.appendUpdateValues(connector, sql, parent);
final Results rs = connector.select(sql.toString());
final List<ObjectAdapter> list = new ArrayList<ObjectAdapter>();
while (rs.next()) {
final Oid oid = idMapping.recreateOid(rs, specification);
final ObjectAdapter element = getAdapter(specification, oid);
loadFields(element, rs, makeResolved);
LOG.debug(" element " + element.getOid());
list.add(element);
}
final CollectionFacet collectionFacet = collection.getSpecification().getFacet(CollectionFacet.class);
collectionFacet.init(collection, list.toArray(new ObjectAdapter[list.size()]));
rs.close();
PersistorUtil.end(collection);
}
}
protected void loadFields(final ObjectAdapter object, final Results rs, final boolean makeResolved) {
PersistorUtil.start(object, ResolveState.RESOLVING);
for (final FieldMapping mapping : fieldMappings) {
mapping.initializeField(object, rs);
}
/*
* for (int i = 0; i < oneToManyProperties.length; i++) { /* Need to set
* up collection to be a ghost before we access as below
*/
// CollectionAdapter collection = (CollectionAdapter)
/*
* oneToManyProperties[i].get(object); }
*/
object.setOptimisticLock(versionMapping.getLock(rs));
if (makeResolved) {
PersistorUtil.end(object);
}
}
@Override
public void saveInternalCollection(final DatabaseConnector connector, final ObjectAdapter parent) {
final ObjectAdapter collection = field.get(parent);
LOG.debug("Saving internal collection " + collection);
deleteAllElments(connector, parent);
reinsertElements(connector, parent, collection);
}
private void reinsertElements(final DatabaseConnector connector, final ObjectAdapter parent, final ObjectAdapter collection) {
final StringBuffer sql = new StringBuffer();
sql.append("insert into " + table + " (");
idMapping.appendColumnNames(sql);
sql.append(", ");
final String columnList = columnList(fieldMappings);
if (columnList.length() > 0) {
sql.append(columnList);
sql.append(", ");
}
sql.append(versionMapping.insertColumns());
sql.append(") values (");
idMapping.appendInsertValues(connector, sql, parent);
sql.append(", ");
final CollectionFacet collectionFacet = field.getFacet(CollectionFacet.class);
for (final ObjectAdapter element : collectionFacet.iterable(collection)) {
final StringBuffer insert = new StringBuffer(sql);
insert.append(values(connector, element));
final SerialNumberVersion version = new SerialNumberVersion(0, "", new Date());
insert.append(versionMapping.insertValues(connector, version));
insert.append(") ");
connector.insert(insert.toString());
element.setOptimisticLock(version);
}
}
private void deleteAllElments(final DatabaseConnector connector, final ObjectAdapter parent) {
final StringBuffer sql = new StringBuffer();
sql.append("delete from ");
sql.append(table);
sql.append(" where ");
idMapping.appendUpdateValues(connector, sql, parent);
connector.update(sql.toString());
}
@Override
public void debugData(final DebugBuilder debug) {
debug.appendln(field.getName(), "collection");
debug.indent();
debug.appendln("ID mapping", idMapping);
debug.appendln("Version mapping", versionMapping);
debug.unindent();
}
}