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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.impl;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Collections;
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.Command;
import org.apache.tuscany.das.rdb.DAS;
import org.apache.tuscany.das.rdb.config.Config;
import org.apache.tuscany.das.rdb.config.ConfigFactory;
import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;
import org.apache.tuscany.das.rdb.util.ConfigUtil;
import commonj.sdo.DataObject;
/**
* An ConfiguredCommandFactory produces instances of Command and ApplyChangesCommand. This
* factory is initialized with a configuration that defines
* the commands it produces.
*
*/
public class DASImpl implements DAS {
private MappingWrapper configWrapper;
private Connection connection;
private Map commands = new HashMap();
public DASImpl(InputStream stream) {
this(ConfigUtil.loadConfig(stream));
}
public DASImpl(Config inConfig) {
Config cfg = inConfig;
if (cfg == null) {
cfg = ConfigFactory.INSTANCE.createConfig();
}
this.configWrapper = new MappingWrapper(cfg);
Iterator i = configWrapper.getConfig().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(),
configWrapper, commandConfig.getResultDescriptor()));
} 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(), new String[0]));
} else if (kind.equalsIgnoreCase("delete")) {
commands.put(commandConfig.getName(), new DeleteCommandImpl(commandConfig.getSQL()));
} else if (kind.equalsIgnoreCase("procedure")) {
commands.put(commandConfig.getName(), new SPCommandImpl(commandConfig.getSQL(),
configWrapper, commandConfig.getParameter()));
} else {
throw new RuntimeException("Invalid kind of command: " + kind);
}
}
}
public DASImpl(Config inConfig, Connection inConnection) {
this(inConfig);
setConnection(inConnection);
}
public DASImpl(InputStream configStream, Connection inConnection) {
this(ConfigUtil.loadConfig(configStream), inConnection);
}
public DASImpl(Connection inConnection) {
this(ConfigFactory.INSTANCE.createConfig());
setConnection(inConnection);
}
/*
* (non-Javadoc)
*
* @see org.apache.tuscany.das.rdb.CommandGroup#getApplyChangesCommand()
*/
public ApplyChangesCommandImpl getApplyChangesCommand() {
ApplyChangesCommandImpl cmd = new ApplyChangesCommandImpl(configWrapper, connection);
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);
}
CommandImpl cmd = (CommandImpl) commands.get(name);
cmd.setConnection(getConnection(), configWrapper.getConfig());
return cmd;
}
public void setConnection(Connection connection) {
this.connection = connection;
}
public Connection getConnection() {
if (connection == null) {
initializeConnection();
}
return connection;
}
private void initializeConnection() {
Config config = configWrapper.getConfig();
if (config == null || config.getConnectionInfo() == null
|| config.getConnectionInfo().getDataSource() == null) {
throw new RuntimeException("No connection has been provided and no data source has been specified");
}
Connection connection = null;
InitialContext ctx;
try {
ctx = new InitialContext();
} catch (NamingException e) {
throw new RuntimeException(e);
}
try {
DataSource ds = (DataSource) ctx.lookup(configWrapper.getConfig().getConnectionInfo().getDataSource());
try {
connection = ds.getConnection();
if (connection == null) {
throw new RuntimeException("Could not obtain a Connection from DataSource");
}
connection.setAutoCommit(false);
setConnection(connection);
} catch (SQLException e) {
throw new RuntimeException(e);
}
} catch (NamingException e) {
throw new RuntimeException(e);
}
}
public void releaseResources() {
if (managingConnections()) {
closeConnection();
}
}
private void closeConnection() {
if (connection != null) {
try {
connection.close();
connection = null;
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
/**
* If the config has connection properties then we are "managing" the connection via DataSource
*/
private boolean managingConnections() {
if (configWrapper.getConfig().getConnectionInfo().getDataSource() == null) {
return false;
}
return true;
}
public Command createCommand(String sql) {
return baseCreateCommand(sql, this.configWrapper);
}
public Command createCommand(String sql, Config config) {
return baseCreateCommand(sql, new MappingWrapper(config));
}
private Command baseCreateCommand(String inSql, MappingWrapper config) {
CommandImpl returnCmd = null;
String sql = inSql.trim(); // Remove leading white space
char firstChar = Character.toUpperCase(sql.charAt(0));
switch (firstChar) {
case 'S':
returnCmd = new ReadCommandImpl(sql, config, null);
break;
case 'I':
returnCmd = new InsertCommandImpl(sql, new String[0]);
break;
case 'U':
returnCmd = new UpdateCommandImpl(sql);
break;
case 'D':
returnCmd = new DeleteCommandImpl(sql);
break;
case '{':
returnCmd = new SPCommandImpl(sql, config, Collections.EMPTY_LIST);
break;
default:
throw new RuntimeException("SQL => " + sql + " is not valid");
}
returnCmd.setConnection(getConnection(), config.getConfig());
return returnCmd;
}
public void applyChanges(DataObject root) {
getApplyChangesCommand().execute(root);
}
}
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