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* 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.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.facets.collections.modify.CollectionFacet;
import org.apache.isis.core.metamodel.facets.typeof.TypeOfFacet;
import org.apache.isis.core.metamodel.spec.ObjectSpecification;
import org.apache.isis.core.metamodel.spec.feature.ObjectAssociation;
import org.apache.isis.runtimes.dflt.objectstores.sql.AbstractMapper;
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.IdMapping;
import org.apache.isis.runtimes.dflt.objectstores.sql.Results;
import org.apache.isis.runtimes.dflt.objectstores.sql.Sql;
import org.apache.isis.runtimes.dflt.objectstores.sql.jdbc.JdbcObjectReferenceMapping;
import org.apache.isis.runtimes.dflt.objectstores.sql.mapping.ObjectReferenceMapping;
import org.apache.isis.runtimes.dflt.runtime.persistence.PersistorUtil;
public class AutoCollectionMapper extends AbstractMapper implements CollectionMapper {
private static final Logger LOG = Logger.getLogger(AutoCollectionMapper.class);
private String tableName;
private final ObjectAssociation field;
private final ObjectReferenceMapping elementMapping;
private final IdMapping idMapping;
public AutoCollectionMapper(final ObjectSpecification specification, final ObjectAssociation field, final FieldMappingLookup lookup) {
this.field = field;
final ObjectSpecification spec = field.getFacet(TypeOfFacet.class).valueSpec();
idMapping = lookup.createIdMapping();
elementMapping = lookup.createMapping(spec);
final String className = specification.getShortIdentifier();
final String columnName = field.getId();
tableName = Sql.sqlName(className) + "_" + asSqlName(columnName);
tableName = Sql.identifier(tableName);
}
@Override
public void createTables(final DatabaseConnector connector) {
if (!connector.hasTable(tableName)) {
final StringBuffer sql = new StringBuffer();
sql.append("create table ");
sql.append(tableName);
sql.append(" (");
idMapping.appendColumnDefinitions(sql);
sql.append(", ");
elementMapping.appendColumnDefinitions(sql);
sql.append(")");
connector.update(sql.toString());
}
}
@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);
collection.changeState(ResolveState.RESOLVING);
final StringBuffer sql = new StringBuffer();
sql.append("select ");
idMapping.appendColumnNames(sql);
sql.append(", ");
elementMapping.appendColumnNames(sql);
sql.append(" from ");
sql.append(tableName);
final Results rs = connector.select(sql.toString());
final List<ObjectAdapter> list = new ArrayList<ObjectAdapter>();
while (rs.next()) {
final ObjectAdapter element = ((JdbcObjectReferenceMapping) elementMapping).initializeField(rs);
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();
if (makeResolved) {
PersistorUtil.end(collection);
}
}
}
@Override
public boolean needsTables(final DatabaseConnector connector) {
return !connector.hasTable(tableName);
}
@Override
public void saveInternalCollection(final DatabaseConnector connector, final ObjectAdapter parent) {
final ObjectAdapter collection = field.get(parent);
LOG.debug("saving internal collection " + collection);
StringBuffer sql = new StringBuffer();
sql.append("delete from ");
sql.append(tableName);
sql.append(" where ");
idMapping.appendWhereClause(connector, sql, parent.getOid());
connector.update(sql.toString());
sql = new StringBuffer();
sql.append("insert into ");
sql.append(tableName);
sql.append(" (");
idMapping.appendColumnNames(sql);
sql.append(", ");
elementMapping.appendColumnNames(sql);
sql.append(" ) values (");
idMapping.appendInsertValues(connector, sql, parent);
sql.append(", ");
final CollectionFacet collectionFacet = collection.getSpecification().getFacet(CollectionFacet.class);
for (final ObjectAdapter element : collectionFacet.iterable(collection)) {
final StringBuffer values = new StringBuffer();
elementMapping.appendInsertValues(connector, values, element);
connector.update(sql.toString() + values + ")");
}
}
@Override
public void debugData(final DebugBuilder debug) {
debug.appendln(field.getName(), "collection");
debug.indent();
debug.appendln("Table", tableName);
debug.appendln("ID mapping", idMapping);
debug.appendln("Element mapping", elementMapping);
debug.unindent();
}
}