Examples of henplus.Command

henplus.Command
Interface to be implemented for user level commands.
The CommandDispatcher and the HelpCommand operate on this interface. This interface needs to be implemented by your own Commands or Plugins that should be supported by HenPlus. If the documenation given here is not enough (though I hope it is), just read some of the implementations given in henplus.commands.

If you are writing Plugins, consider extending the {@link AbstractCommand} as it provides a default implementation and you areimmune to NoSuchMethodErrors if this interface changes but not yet your plugin...

This interface is defined as an abstract class so we can define static methods.
@version $Revision: 1.11 $ @author Henner Zeller

        final Iterator<String> it = disp.getRegisteredCommandNames(lastWord);
        return new SortedMatchIterator(lastWord, it) {


            @Override
            protected boolean exclude(final String cmdName) {
                final Command cmd = disp.getCommandFrom(cmdName);
                return cmd.getLongDescription(cmdName) == null;
            }
        };
    }

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         * nothing given: provide generic help.
         */
        if (param == null) {
            final Iterator<Command> it = HenPlus.getInstance().getDispatcher().getRegisteredCommands();
            while (it.hasNext()) {
                final Command cmd = it.next();
                final String description = cmd.getShortDescription();
                if (description == null) {
                    continue;
                }


                final StringBuilder cmdPrint = new StringBuilder(" ");
                final String[] cmds = cmd.getCommandList();
                final String firstSynopsis = cmd.getSynopsis(cmds[0]);
                /*
                 * either print a list of known commands or the complete
                 * synopsis, if there is only one command.
                 */
                if (cmds.length > 1 || firstSynopsis == null) {
                    for (int i = 0; i < cmds.length; ++i) {
                        if (i != 0) {
                            cmdPrint.append(" | ");
                        }
                        cmdPrint.append(cmds[i]);
                    }
                } else {
                    cmdPrint.append(firstSynopsis.length() < INDENT ? firstSynopsis : cmds[0]);
                }
                HenPlus.msg().print(cmdPrint.toString());
                for (int i = cmdPrint.length(); i < INDENT; ++i) {
                    HenPlus.msg().print(" ");
                }
                HenPlus.msg().print(": ");
                HenPlus.msg().println(description);
            }
            HenPlus.msg().println("Full documentation at http://henplus.sf.net/");
            HenPlus.msg().println("config read from [" + HenPlus.getInstance().getConfigurationDirectoryInfo() + "]");
        } else {
            final CommandDispatcher disp = HenPlus.getInstance().getDispatcher();
            final String cmdString = disp.getCommandNameFrom(param);
            final Command c = disp.getCommandFrom(param);
            if (c == null) {
                HenPlus.msg().println("Help: unknown command '" + param + "'");
                return EXEC_FAILED;
            }
            printDescription(cmdString, c);

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         * ok, someone tries to complete something that is a command. try to
         * find the actual command and ask that command to do the completion.
         */
        final String toExecute = _aliases.get(cmd);
        if (toExecute != null) {
            final Command c = disp.getCommandFrom(toExecute);
            if (c != null) {
                int i = 0;
                final String param = partialCommand;
                while (param.length() < i && Character.isWhitespace(param.charAt(i))) {
                    ++i;
                }
                while (param.length() < i && !Character.isWhitespace(param.charAt(i))) {
                    ++i;
                }
                return c.complete(disp, toExecute + param.substring(i), lastWord);
            }
        }


        return null;
    }

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                String actualCmdStr = _aliases.get(cmd);
                if (actualCmdStr != null) {
                    final StringTokenizer st = new StringTokenizer(actualCmdStr);
                    actualCmdStr = st.nextToken();
                    final Command c = _dispatcher.getCommandFrom(actualCmdStr);
                    String longDesc = null;
                    if (c != null && (longDesc = c.getLongDescription(actualCmdStr)) != null) {
                        dsc += "\n\n\t..the following description could be determined for this";
                        dsc += "\n\t------- [" + actualCmdStr + "] ---\n";
                        dsc += longDesc;
                    }
                    _currentExecutedAliases.clear();

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                while ((line = in.readLine()) != null) {
                    line = line.trim();
                    if (line.length() == 0) {
                        continue;
                    }
                    Command plugin = null;
                    try {
                        plugin = loadPlugin(line);
                    } catch (final Exception e) {
                        HenPlus.msg().println("couldn't load plugin '" + line + "' " + e.getMessage());
                    }

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    /**
     * load a plugin and register it at HenPlus.
     */
    private Command loadPlugin(final String className) throws ClassNotFoundException, ClassCastException, InstantiationException,
            IllegalAccessException {
        Command plugin = null;
        final Class<?> pluginClass = Class.forName(className);
        plugin = (Command) pluginClass.newInstance();
        _henplus.getDispatcher().register(plugin);
        return plugin;
    }

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            DRV_META[0].resetWidth();
            DRV_META[1].resetWidth();
            final TableRenderer table = new TableRenderer(DRV_META, HenPlus.out());
            for (Entry<String,Command> entry : _plugins.entrySet()) {
                final Column[] row = new Column[2];
                final Command c = entry.getValue();
                final String clsName = entry.getKey();
                row[0] = new Column((c != null ? "* " : "  ") + clsName);
                if (c != null) {
                    final StringBuilder cmds = new StringBuilder();
                    final String[] cmdList = c.getCommandList();
                    for (int i = 0; i < cmdList.length; ++i) {
                        cmds.append(cmdList[i]).append("\n");
                    }
                    row[1] = new Column(cmds.toString().trim());
                } else {
                    row[1] = new Column(null);
                }
                table.addRow(row);
            }
            table.closeTable();
            return SUCCESS;
        } else if ("plug-in".equals(cmd)) {
            if (argc != 1) {
                return SYNTAX_ERROR;
            }
            final String pluginClass = (String) st.nextElement();
            if (_plugins.containsKey(pluginClass)) {
                HenPlus.msg().println("plugin '" + pluginClass + "' already loaded");
                return EXEC_FAILED;
            }
            Command plugin = null;
            try {
                plugin = loadPlugin(pluginClass);
            } catch (final Exception e) {
                HenPlus.msg().println("couldn't load plugin: " + e.getMessage());
                return EXEC_FAILED;
            }
            if (plugin != null) {
                _plugins.put(pluginClass, plugin);
                final String[] cmds = plugin.getCommandList();
                HenPlus.out().print("adding commands: ");
                for (int i = 0; i < cmds.length; ++i) {
                    if (i != 0) {
                        HenPlus.out().print(", ");
                    }
                    HenPlus.out().print(cmds[i]);
                }
                HenPlus.out().println();
            }
        } else if ("plug-out".equals(cmd)) {
            if (argc != 1) {
                return SYNTAX_ERROR;
            }
            final String pluginClass = (String) st.nextElement();
            if (!_plugins.containsKey(pluginClass)) {
                HenPlus.msg().println("unknown plugin '" + pluginClass + "'");
                return EXEC_FAILED;
            } else {
                final Command c = _plugins.remove(pluginClass);
                _henplus.getDispatcher().unregister(c);
            }
        }
        return SUCCESS;
    }

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Related Classes of henplus.Command

henplus.commands.AliasCommand

henplus.commands.HelpCommand

henplus.commands.PluginCommand

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