diff options
Diffstat (limited to 'sca-java-1.x/tags/java-stable-20060304/das/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/CommandGroupImpl.java')
| -rw-r--r-- | sca-java-1.x/tags/java-stable-20060304/das/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/CommandGroupImpl.java | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-stable-20060304/das/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/CommandGroupImpl.java b/sca-java-1.x/tags/java-stable-20060304/das/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/CommandGroupImpl.java new file mode 100644 index 0000000000..35f77fb934 --- /dev/null +++ b/sca-java-1.x/tags/java-stable-20060304/das/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/CommandGroupImpl.java @@ -0,0 +1,195 @@ +/** + * + * 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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