jmxsh.ListCmd.java Source code

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Here is the source code for jmxsh.ListCmd.java

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/*
 * $URL$
 * 
 * $Revision$ 
 * 
 * $LastChangedDate$
 *
 * $LastChangedBy$
 *
 * 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 jmxsh;

import java.util.*;
import org.apache.commons.cli.*;
import tcl.lang.*;

class ListCmd implements Command {

    private final static ListCmd instance = new ListCmd();

    private String server;
    private Options opts;

    static ListCmd getInstance() {
        return instance;
    }

    private ListCmd() {
        this.opts = new Options();

        this.opts.addOption(OptionBuilder.withLongOpt("server").withDescription("Server containing mbean.")
                .withArgName("SERVER").hasArg().create("s"));

        this.opts.addOption(
                OptionBuilder.withLongOpt("help").withDescription("Display usage help.").hasArg(false).create("?"));
    }

    private CommandLine parseCommandLine(TclObject argv[]) throws ParseException {

        String[] args = new String[argv.length - 1];

        for (int i = 0; i < argv.length - 1; i++)
            args[i] = argv[i + 1].toString();

        CommandLine cl = (new PosixParser()).parse(this.opts, args);
        return cl;
    }

    private void listDefaults(Interp interp) {
        this.server = null;

        try {
            this.server = interp.getVar("SERVER", TCL.GLOBAL_ONLY).toString();
        } catch (TclException e) {
            /* If one doesn't exist, it will just be null. */
        }

    }

    public void cmdProc(Interp interp, TclObject argv[]) throws TclException {

        try {
            CommandLine cl = parseCommandLine(argv);
            String args[] = cl.getArgs();
            String[] expressions = null;

            if (cl.hasOption("help")) {
                new HelpFormatter().printHelp("jmx_list [-?] [-s server] domain_regex:mbean_regex",
                        "======================================================================", this.opts,
                        "======================================================================", false);
                System.out.println("jmx_list retrieves the list of known mbeans for the given");
                System.out.println("server.  It takes a pair of regex expressions separated by");
                System.out.println("colon.  The first is an expression for the domain, the");
                System.out.println("second is an expression for the mbean.");
                System.out.println("");
                System.out.println("It will return a list of tcl strings.");
                return;
            }

            listDefaults(interp);

            this.server = cl.getOptionValue("server", this.server);

            if (args.length > 0) {
                expressions = args[0].split(":");
            }

            if (this.server == null) {
                throw new TclException(interp, "No server specified; please set SERVER variable or use -s option.",
                        TCL.ERROR);
            }

            String domain_regex = (expressions != null && expressions.length > 0) ? expressions[0] : "";
            String mbean_regex = (expressions != null && expressions.length > 1) ? expressions[1] : "";

            String[] domains = Jmx.getInstance().getDomains(this.server, domain_regex);
            Vector<String> beans = new Vector<String>();
            for (String domain : domains) {
                List<String> list = Arrays.asList(Jmx.getInstance().getMBeans(this.server, domain, mbean_regex));
                beans.addAll(list);
            }

            String[] emptyStringArray = new String[0];
            TclObject result = Utils.array2list(beans.toArray(emptyStringArray));
            interp.setResult(result);
        } catch (ParseException e) {
            throw new TclException(interp, e.getMessage(), 1);
        } catch (RuntimeException e) {
            throw new TclException(interp, "Cannot convert result to a string.", 1);
        }
    }

}