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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.tuscany.das.rdb.generator.impl;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import org.apache.log4j.Logger;
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.CollisionParameter;
import org.apache.tuscany.das.rdb.impl.ManagedParameterImpl;
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 commonj.sdo.ChangeSummary;
import commonj.sdo.DataObject;
import commonj.sdo.Property;
import commonj.sdo.Type;
import commonj.sdo.ChangeSummary.Setting;
public final class UpdateGenerator extends BaseGenerator {
public static final UpdateGenerator INSTANCE = new UpdateGenerator();
private final Logger logger = Logger.getLogger(UpdateGenerator.class);
private UpdateGenerator() {
super();
}
public UpdateCommandImpl getUpdateCommand(MappingWrapper mapping, DataObject changedObject, Table table) {
List parameters = new ArrayList();
Type type = changedObject.getType();
TableWrapper tableWrapper = new TableWrapper(table);
StringBuffer statement = new StringBuffer("update ");
//JIRA-952
if(mapping.getConfig().isDatabaseSchemaNameSupported()){
statement.append(table.getSchemaName()+"."+table.getTableName());
}
else{
statement.append(table.getTableName());
}
statement.append(" set ");
ChangeSummary summary = changedObject.getDataGraph().getChangeSummary();
HashSet changedFields = getChangedFields(mapping, summary, changedObject, tableWrapper);
Iterator i = changedFields.iterator();
int idx = 1;
while (i.hasNext()) {
Property property = (Property) i.next();
Column c = tableWrapper.getColumnByPropertyName(property.getName());
if ((c == null) || !c.isCollision() || !c.isPrimaryKey()) {
String columnName = c == null ? property.getName() : c.getColumnName();
appendFieldSet(statement, idx > 1, columnName);
parameters.add(createParameter(tableWrapper, property, idx++));
}
}
Column c = tableWrapper.getManagedColumn();
if (c != null) {
appendFieldSet(statement, idx > 1, c.getColumnName());
String propertyName = c.getPropertyName() == null ? c.getColumnName() : c.getPropertyName();
parameters.add(createManagedParameter(tableWrapper,
changedObject.getProperty(propertyName), idx++));
}
statement.append(" where ");
Iterator pkColumnNames = tableWrapper.getPrimaryKeyNames().iterator();
Iterator pkPropertyNames = tableWrapper.getPrimaryKeyProperties().iterator();
while (pkColumnNames.hasNext() && pkPropertyNames.hasNext()) {
String columnName = (String) pkColumnNames.next();
String propertyName = (String) pkPropertyNames.next();
statement.append(columnName);
statement.append(" = ?");
if (pkColumnNames.hasNext() && pkPropertyNames.hasNext()) {
statement.append(" and ");
}
parameters.add(createParameter(tableWrapper, type.getProperty(propertyName), idx++));
}
if (tableWrapper.getCollisionColumn() == null) {
Iterator iter = changedFields.iterator();
while (iter.hasNext()) {
statement.append(" and ");
Property changedProperty = (Property) iter.next();
Column column = tableWrapper.getColumnByPropertyName(changedProperty.getName());
statement.append(column == null ? changedProperty.getName() : column.getColumnName());
Object value;
Setting setting = summary.getOldValue(changedObject, changedProperty);
// Setting is null if this is a relationship change
if (setting == null) {
value = changedObject.get(changedProperty);
} else {
value = setting.getValue();
}
if (value == null) {
statement.append(" is null");
} else {
ParameterImpl param = createCollisionParameter(tableWrapper, changedProperty, idx++);
statement.append(" = ?");
param.setValue(value);
parameters.add(param);
}
}
} else {
statement.append(" and ");
statement.append(tableWrapper.getCollisionColumn().getColumnName());
statement.append(" = ?");
parameters.add(createParameter(tableWrapper,
type.getProperty(tableWrapper.getCollisionColumnPropertyName()), idx++));
}
UpdateCommandImpl updateCommand = new OptimisticWriteCommandImpl(statement.toString());
Iterator params = parameters.iterator();
while (params.hasNext()) {
updateCommand.addParameter((ParameterImpl) params.next());
}
if (this.logger.isDebugEnabled()) {
this.logger.debug(statement.toString());
}
return updateCommand;
}
private void appendFieldSet(StringBuffer statement, boolean appendComma, String columnName) {
if (appendComma) {
statement.append(", ");
}
statement.append(columnName);
statement.append(" = ?");
}
private HashSet getChangedFields(MappingWrapper config, ChangeSummary summary, DataObject obj, TableWrapper tw) {
HashSet changes = new HashSet();
Iterator i = summary.getOldValues(obj).iterator();
while (i.hasNext()) {
ChangeSummary.Setting setting = (ChangeSummary.Setting) i.next();
if (setting.getProperty().getType().isDataType()) {
if ( changes.add(setting.getProperty()) == false ) {
throw new RuntimeException("Foreign key properties should not be set when the corresponding relationship has changed");
}
} else {
Property ref = setting.getProperty();
if (!ref.isMany()) {
RelationshipWrapper r = new RelationshipWrapper(config.getRelationshipByReference(ref));
Iterator keys = r.getForeignKeys().iterator();
while (keys.hasNext()) {
String key = (String) keys.next();
String keyProperty = config.getColumnPropertyName(tw.getTableName(), key);
Property keyProp = obj.getType().getProperty(keyProperty);
if ( keyProp == null )
throw new RuntimeException("Invalid foreign key column: " + key);
if (changes.add(keyProp) == false) {
throw new RuntimeException("Foreign key properties should not be set when the corresponding relationship has changed");
}
}
}
}
}
return changes;
}
private ParameterImpl fillParameter(ParameterImpl param, TableWrapper table, Property property, int idx) {
param.setName(property.getName());
param.setType(property.getType());
param.setConverter(getConverter(table.getConverter(property.getName())));
if (idx != -1) {
param.setIndex(idx);
}
return param;
}
private ParameterImpl createCollisionParameter(TableWrapper tableWrapper, Property property, int i) {
ParameterImpl param = new CollisionParameter();
return fillParameter(param, tableWrapper, property, i);
}
private ParameterImpl createManagedParameter(TableWrapper table, Property property, int idx) {
ParameterImpl param = new ManagedParameterImpl();
return fillParameter(param, table, property, idx);
}
private ParameterImpl createParameter(TableWrapper table, Property property, int idx) {
ParameterImpl param = new ParameterImpl();
return fillParameter(param, table, property, idx);
}
}
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