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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed 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.generator.impl;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.tuscany.das.rdb.Converter;
import org.apache.tuscany.das.rdb.Parameter;
import org.apache.tuscany.das.rdb.config.Column;
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.impl.OptimisticWriteCommandImpl;
import org.apache.tuscany.das.rdb.impl.ParameterImpl;
import org.apache.tuscany.das.rdb.impl.UpdateCommandImpl;
import org.apache.tuscany.das.rdb.util.DebugUtil;
import commonj.sdo.ChangeSummary;
import commonj.sdo.DataObject;
import commonj.sdo.Property;
import commonj.sdo.Type;
public class UpdateGenerator {
private boolean debug = false;
public static UpdateGenerator instance = new UpdateGenerator();
public UpdateGenerator() {
super();
}
public UpdateCommandImpl getUpdateCommand(MappingWrapper mapping, DataObject changedObject, Table table) {
ArrayList parameters = new ArrayList();
Type type = changedObject.getType();
TableWrapper t = new TableWrapper(table);
StringBuffer statement = new StringBuffer("update ");
statement.append(table.getName());
statement.append(" set ");
ChangeSummary summary = changedObject.getDataGraph().getChangeSummary();
Iterator i = getChangedFields(mapping, summary, changedObject).iterator();
while (i.hasNext()) {
Property attr = (Property) i.next();
Column c = t.getColumnByPropertyName(attr.getName());
if ((c != null) && (c.isCollision() || c.isPrimaryKey())) {
// get rid of comma if OCC or PK is last field
if (!i.hasNext()) {
statement
.delete(statement.length() - 2, statement.length());
}
} else {
parameters.add(attr);
statement.append(c == null ? attr.getName() : c.getName());
statement.append(" = ?");
if (i.hasNext())
statement.append(", ");
}
}
statement.append(" where ");
Iterator names = t.getPrimaryKeyNames().iterator();
Iterator properties = t.getPrimaryKeyProperties().iterator();
while (names.hasNext() && properties.hasNext()) {
String name = (String) names.next();
String property = (String) properties.next();
statement.append(name);
statement.append(" = ?");
if (names.hasNext() && properties.hasNext())
statement.append(" and ");
parameters.add(type.getProperty(property));
}
if (t.getCollisionColumn() != null) {
statement.append(" and ");
statement.append(t.getCollisionColumn().getName());
statement.append(" = ?");
parameters.add(type.getProperty(t.getCollisionColumnPropertyName()));
}
UpdateCommandImpl updateCommand;
if ( t.getCollisionColumn() != null )
updateCommand = new OptimisticWriteCommandImpl(statement.toString());
else
updateCommand = new UpdateCommandImpl(statement.toString());
Iterator params = parameters.iterator();
for (int idx = 1; params.hasNext(); idx++ ) {
Property p = (Property)params.next();
Parameter param = new ParameterImpl();
param.setName(p.getName());
param.setType(p.getType());
param.setConverter(getConverter(t, p.getName()));
param.setIndex(idx);
updateCommand.addParameter(param);
}
DebugUtil.debugln(getClass(), debug, statement.toString());
return updateCommand;
}
private List getAttributeProperties(DataObject obj) {
ArrayList fields = new ArrayList();
Iterator i = obj.getType().getProperties().iterator();
while ( i.hasNext() ) {
Property p = (Property) i.next();
if ( p.getType().isDataType())
fields.add(p);
}
return fields;
}
private List getChangedFields(MappingWrapper mapping, ChangeSummary summary, DataObject obj) {
ArrayList changes = new ArrayList();
Iterator i = summary.getOldValues(obj).iterator();
while (i.hasNext()) {
ChangeSummary.Setting setting = (ChangeSummary.Setting) i.next();
if (setting.getProperty().getType().isDataType()) {
changes.add(setting.getProperty());
} else {
Property ref = setting.getProperty();
if ( !ref.isMany() ) {
RelationshipWrapper r = new RelationshipWrapper(mapping.getRelationshipByReference(ref));
Iterator keys = r.getForeignKeys().iterator();
while ( keys.hasNext()) {
String key = (String) keys.next();
Property p = obj.getType().getProperty(key);
changes.add(p);
}
}
}
}
return changes;
}
private Converter getConverter(TableWrapper tw, String name) {
String converter = tw.getConverter(name);
if ( converter != null ) {
try {
return (Converter) Class.forName(converter).newInstance();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
return null;
}
public Collection getUpdateParameters(DataObject changedObject, Table table) {
Type type = changedObject.getType();
TableWrapper wrapper = new TableWrapper(table);
Collection pkNames = wrapper.getPrimaryKeyProperties();
ArrayList parameters = new ArrayList();
ArrayList pkParams = new ArrayList();
Iterator i = getAttributeProperties(changedObject).iterator();
while (i.hasNext()) {
Property attr = (Property) i.next();
String field = attr.getName();
Parameter p = getParameter(wrapper, type.getProperty(field));
if (pkNames.contains(field)) {
pkParams.add(p);
} else {
parameters.add(p);
}
}
parameters.addAll(pkParams);
return parameters;
}
private Parameter getParameter(TableWrapper wrapper, Property property) {
Parameter param = new ParameterImpl();
param.setName(property.getName());
param.setType(property.getType());
param.setConverter(getConverter(wrapper, property.getName()));
return param;
}
}
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