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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.impl;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import org.apache.tuscany.das.rdb.ApplyChangesCommand;
import org.apache.tuscany.das.rdb.Command;
import org.apache.tuscany.das.rdb.CommandGroup;
import org.apache.tuscany.das.rdb.config.Config;
import org.apache.tuscany.das.rdb.config.ConnectionProperties;
import org.apache.tuscany.das.rdb.config.impl.ConfigPackageImpl;
import commonj.sdo.helper.XMLHelper;
/**
* An ConfiguredCommandFactory produces instances of Command and
* ApplyChangesCommand. This factory is initialized with a configuration that
* defines the commands it produces.
*
* <p>
* TODO - This is still underdevelopment and is likely to replace CommandFactory
* as the preferred mechanism to set commands at runtime.
*
*
*/
public class CommandGroupImpl implements CommandGroup {
private Config config;
private Connection connection;
private Map commands = new HashMap();
public CommandGroupImpl(InputStream stream) {
super();
setConfig(stream);
initialize();
}
private void initialize() {
Iterator i = config.getCommand().iterator();
while (i.hasNext()) {
org.apache.tuscany.das.rdb.config.Command commandConfig = (org.apache.tuscany.das.rdb.config.Command) i
.next();
String kind = commandConfig.getKind();
if (kind.equalsIgnoreCase("select"))
commands.put(commandConfig.getName(), new ReadCommandImpl(commandConfig.getSQL(), config));
else if (kind.equalsIgnoreCase("update"))
commands.put(commandConfig.getName(), new UpdateCommandImpl(commandConfig.getSQL()));
else if (kind.equalsIgnoreCase("insert"))
commands.put(commandConfig.getName(), new InsertCommandImpl(commandConfig.getSQL()));
else if (kind.equalsIgnoreCase("delete"))
commands.put(commandConfig.getName(), new DeleteCommandImpl(commandConfig.getSQL()));
else
throw new Error("Invalid kind of command: " + kind);
}
}
/*
* (non-Javadoc)
*
* @see org.apache.tuscany.das.rdb.CommandGroup#getApplyChangesCommand()
*/
public ApplyChangesCommand getApplyChangesCommand() {
ApplyChangesCommand cmd = new ApplyChangesCommandImpl(config);
cmd.setConnection(getConnection());
return cmd;
}
/*
* (non-Javadoc)
*
* @see org.apache.tuscany.das.rdb.CommandGroup#getCommand(java.lang.String)
*/
public Command getCommand(String name) {
if (!commands.containsKey(name))
throw new RuntimeException("CommandGroup has no command named: " + name);
Command cmd = (Command) commands.get(name);
cmd.setConnection(getConnection());
return cmd;
}
// Private
private void setConfig(InputStream stream) {
XMLHelper helper = XMLHelper.INSTANCE;
ConfigPackageImpl impl = ConfigPackageImpl.eINSTANCE;
try {
config = (Config) helper.load(stream).getRootObject();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public void setConnection(Connection connection) {
this.connection = connection;
}
public Connection getConnection() {
if (connection == null)
initializeConnection();
return connection;
}
private void initializeConnection() {
ConnectionProperties cp = config.getConnectionProperties();
if (cp == null)
throw new Error(
"No connection properties have been configured and no connection has been provided");
if (cp.getDataSource() != null)
initViaDataSource(cp);
else
initViaDriverManager(cp);
}
private void initViaDriverManager(ConnectionProperties cp) {
Connection connection = null;
try {
Class.forName(cp.getDriverClassName());
if (cp.getDriverUserName() == null)
connection = DriverManager.getConnection(cp.getDriverURL());
else
connection = DriverManager.getConnection(cp.getDriverURL(), cp.getDriverUserName(), cp
.getDriverPassword());
connection.setAutoCommit(false);
setConnection(connection);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
//TODO - Refactor to eliminate common initialization code after connection is got
private void initViaDataSource(ConnectionProperties cp) {
Connection connection = null;
InitialContext ctx;
try {
ctx = new InitialContext();
} catch (NamingException e) {
throw new Error(e);
}
try {
//TODO - I think we should rename this getDataSourceURL?
DataSource ds = (DataSource) ctx.lookup(cp.getDataSource());
try {
connection = ds.getConnection();
connection.setAutoCommit(false);
setConnection(connection);
} catch (SQLException e) {
throw new Error (e);
}
} catch (NamingException e) {
throw new Error(e);
}
}
}
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