Source Code Cross Referenced for ConsoleCommand.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » console » text » commands » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.console.text.commands 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Sequoia: Database clustering technology.
003:         * Copyright (C) 2002-2004 French National Institute For Research In Computer
004:         * Science And Control (INRIA).
005:         * Contact: sequoia@continuent.org
006:         * 
007:         * Licensed under the Apache License, Version 2.0 (the "License");
008:         * you may not use this file except in compliance with the License.
009:         * You may obtain a copy of the License at
010:         * 
011:         * http://www.apache.org/licenses/LICENSE-2.0
012:         * 
013:         * Unless required by applicable law or agreed to in writing, software
014:         * distributed under the License is distributed on an "AS IS" BASIS,
015:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016:         * See the License for the specific language governing permissions and
017:         * limitations under the License. 
018:         *
019:         * Initial developer(s): Nicolas Modrzyk.
020:         * Contributor(s): Mathieu Peltier.
021:         */package org.continuent.sequoia.console.text.commands;
022:
023:        import org.continuent.sequoia.common.i18n.ConsoleTranslate;
024:        import org.continuent.sequoia.console.jmx.RmiJmxClient;
025:        import org.continuent.sequoia.console.text.Console;
026:        import org.continuent.sequoia.console.text.ConsoleException;
027:        import org.continuent.sequoia.console.text.module.AbstractConsoleModule;
028:
029:        /**
030:         * This class defines a ConsoleCommand
031:         * 
032:         * @author <a href="mailto:Nicolas.Modrzyk@inria.fr">Nicolas Modrzyk </a>
033:         * @author <a href="mailto:Mathieu.Peltier@inrialpes.fr">Mathieu Peltier </a>
034:         * @version 1.0
035:         */
036:        public abstract class ConsoleCommand implements  Comparable {
037:            protected Console console;
038:            protected RmiJmxClient jmxClient;
039:            protected AbstractConsoleModule module;
040:
041:            /**
042:             * Creates a new <code>ConsoleCommand.java</code> object
043:             * 
044:             * @param module module that owns this commands
045:             */
046:            public ConsoleCommand(AbstractConsoleModule module) {
047:                this .console = module.getConsole();
048:                this .module = module;
049:                jmxClient = console.getJmxClient();
050:            }
051:
052:            /**
053:             * @see java.lang.Comparable#compareTo(java.lang.Object)
054:             */
055:            public int compareTo(Object o) {
056:                if (o instanceof  ConsoleCommand) {
057:                    ConsoleCommand c = (ConsoleCommand) o;
058:                    return getCommandName().compareTo(c.getCommandName());
059:                } else {
060:                    throw new IllegalArgumentException();
061:                }
062:            }
063:
064:            /**
065:             * Check that a JMX connection is established with a controller. If no
066:             * connection is available, a ConsoleException is thrown indicating that the
067:             * console must be connected to a controller in order to execute the command.
068:             * 
069:             * @throws ConsoleException if no JMX connection is available
070:             */
071:            protected void checkJmxConnectionToController()
072:                    throws ConsoleException {
073:                // Force a refresh of jmxClient in case we have reconnected to another
074:                // controller
075:                jmxClient = console.getJmxClient();
076:
077:                if (jmxClient == null)
078:                    throw new ConsoleException(ConsoleTranslate
079:                            .get("console.command.requires.connection")); //$NON-NLS-1$
080:            }
081:
082:            /**
083:             * Parse the text of the command
084:             * 
085:             * @param commandText the command text
086:             * @throws Exception if connection with the mbean server is lost or command
087:             *           does not have the proper format
088:             */
089:            public abstract void parse(String commandText) throws Exception;
090:
091:            /**
092:             * Check if the JMX connection is still valid. Otherwise reconnect.
093:             * 
094:             * @param commandText the parameters to execute the command with
095:             * @throws Exception if fails
096:             */
097:            public void execute(String commandText) throws Exception {
098:                parse(commandText);
099:            }
100:
101:            /**
102:             * Get the name of the command
103:             * 
104:             * @return <code>String</code> of the command name
105:             */
106:            public abstract String getCommandName();
107:
108:            /**
109:             * Return a <code>String</code> description of the parameters of this
110:             * command.
111:             * 
112:             * @return <code>String</code> like &lt;driverPathName&gt;
113:             */
114:            public String getCommandParameters() {
115:                return ""; //$NON-NLS-1$
116:            }
117:
118:            /**
119:             * Get the description of the command
120:             * 
121:             * @return <code>String</code> of the command description
122:             */
123:            public abstract String getCommandDescription();
124:
125:            /**
126:             * Get the usage of the command.
127:             * 
128:             * @return <code>String</code> of the command usage ()
129:             */
130:            public String getUsage() {
131:                String usage = ConsoleTranslate
132:                        .get(
133:                                "command.usage", new String[] { getCommandName(), getCommandParameters() }); //$NON-NLS-1$
134:                usage += "\n   " + getCommandDescription(); //$NON-NLS-1$
135:                return usage;
136:            }
137:        }
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