/*
* 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.tuscany.das.rdb.impl;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.log4j.Logger;
import org.apache.tuscany.das.rdb.Command;
import org.apache.tuscany.das.rdb.config.Column;
import org.apache.tuscany.das.rdb.config.Relationship;
import org.apache.tuscany.das.rdb.config.Table;
import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;
import org.apache.tuscany.das.rdb.config.wrapper.RelationshipWrapper;
import org.apache.tuscany.das.rdb.config.wrapper.TableWrapper;
import org.apache.tuscany.das.rdb.util.CollectionsUtil;
import org.apache.tuscany.sdo.impl.ChangeSummaryImpl;
import commonj.sdo.ChangeSummary;
import commonj.sdo.DataObject;
import commonj.sdo.Property;
import commonj.sdo.Type;
public class ChangeSummarizer {
private final Logger logger = Logger.getLogger(ChangeSummarizer.class);
private Changes changes = new Changes();
private FactoryRegistry registry;
private MappingWrapper mapping = new MappingWrapper();
private ConnectionImpl connection;
private Map generatedKeys = new HashMap();
public ChangeSummarizer() {
// Empty Constructor
}
public Changes loadChanges(DataObject root) {
ChangeSummary changeSummary = root.getDataGraph().getChangeSummary();
if (changeSummary.isLogging()) {
((ChangeSummaryImpl) changeSummary).summarize();
}
List changedObjects = changeSummary.getChangedDataObjects();
if (this.logger.isDebugEnabled()) {
this.logger.debug("List of changed objects contains " + changedObjects.size() + " object(s)");
}
changes.setInsertOrder(mapping.getInsertOrder());
changes.setDeleteOrder(mapping.getDeleteOrder());
Iterator i = changedObjects.iterator();
while (i.hasNext()) {
DataObject o = (DataObject) i.next();
if (!(o.equals(root))) {
createChange(changeSummary, o);
}
}
return changes;
}
public void createChange(ChangeSummary changeSummary, DataObject changedObject) {
if (changeSummary.isCreated(changedObject)) {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Change is a create");
}
if (!changeSummary.isDeleted(changedObject)) {
ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
String propagatedID = (String) generatedKeys.get(changedObject.getType().getName());
changes.addInsert(factory.createInsertOperation(changedObject, propagatedID));
}
} else if (changeSummary.isDeleted(changedObject)) {
ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
if (this.logger.isDebugEnabled()) {
this.logger.debug("Change is a delete");
}
changes.addDelete(factory.createDeleteOperation(changedObject));
} else {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Change is a modify");
}
List attrList = changeSummary.getOldValues(changedObject);
if (hasAttributeChange(attrList)) {
ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
if (this.logger.isDebugEnabled()) {
this.logger.debug("Attribute Change for " + changedObject.getType().getName());
}
String propagatedID = (String) generatedKeys.get(changedObject.getType().getName());
changes.addUpdate(factory.createUpdateOperation(changedObject, propagatedID));
} else {
List values = changeSummary.getOldValues(changedObject);
Iterator i = values.iterator();
while (i.hasNext()) {
ChangeSummary.Setting setting = (ChangeSummary.Setting) i.next();
if (!setting.getProperty().getType().isDataType()) {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Reference change for " + changedObject.getType().getName());
}
Property ref = setting.getProperty();
if (this.logger.isDebugEnabled()) {
this.logger.debug(ref.getName());
}
if (hasState(ref, changedObject)) {
ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
changes.addUpdate(factory.createUpdateOperation(changedObject));
}
}
}
}
}
}
private boolean hasState(Property ref, DataObject changedObject) {
if (ref.getOpposite().isMany()) {
return true;
}
MappingWrapper mw = this.mapping;
if (mw.getConfig() == null) {
mw = registry.getFactory(changedObject.getType()).getConfig();
}
if (mw.getConfig() == null) {
return false;
}
Relationship rel = mw.getRelationshipByReference(ref);
if (!rel.isMany()) {
if (rel.isKeyRestricted()) {
throw new RuntimeException("Can not modify a one to one relationship that is key restricted");
}
// This is a one-one relationship
Table t = mapping.getTableByTypeName(changedObject.getType().getName());
TableWrapper tw = new TableWrapper(t);
RelationshipWrapper rw = new RelationshipWrapper(rel);
if ((rel.getForeignKeyTable().equals(t.getTableName()))
&& (CollectionsUtil.disjoint(tw.getPrimaryKeyProperties(), rw.getForeignKeys()))) {
return true;
}
}
return false;
}
private boolean hasAttributeChange(List theChanges) {
Iterator i = theChanges.iterator();
while (i.hasNext()) {
ChangeSummary.Setting setting = (ChangeSummary.Setting) i.next();
if (setting.getProperty().getType().isDataType()) {
return true;
}
}
return false;
}
public void addCreateCommand(Type type, Command cmd) {
ChangeFactory cf = getRegistry().getFactory(type);
cf.setCreateCommand((InsertCommandImpl) cmd);
((CommandImpl) cmd).setConnection(connection);
}
public void addUpdateCommand(Type type, Command cmd) {
ChangeFactory cf = getRegistry().getFactory(type);
cf.setUpdateCommand((UpdateCommandImpl) cmd);
((CommandImpl) cmd).setConnection(connection);
}
public void addDeleteCommand(Type type, Command cmd) {
ChangeFactory cf = getRegistry().getFactory(type);
cf.setDeleteCommand((DeleteCommandImpl) cmd);
((CommandImpl) cmd).setConnection(connection);
}
private FactoryRegistry getRegistry() {
if (this.registry == null) {
this.registry = new FactoryRegistry(mapping, connection);
}
return this.registry;
}
public void setConnection(ConnectionImpl connection) {
this.connection = connection;
}
public void setMapping(MappingWrapper map) {
this.mapping = map;
if (mapping.getConfig() == null) {
return;
}
Iterator i = mapping.getConfig().getTable().iterator();
while (i.hasNext()) {
Table t = (Table) i.next();
Iterator columns = t.getColumn().iterator();
while (columns.hasNext()) {
Column c = (Column) columns.next();
if (c.isPrimaryKey() && c.isGenerated()) {
if (this.logger.isDebugEnabled()) {
this.logger.debug("adding generated key " + t.getTableName() + "." + c.getColumnName());
}
generatedKeys.put(t.getTableName(), c.getColumnName());
}
}
}
}
public ConnectionImpl getConnection() {
return this.connection;
}
}