jmxsh.GetCmd.java Source code

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Here is the source code for jmxsh.GetCmd.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 org.apache.commons.cli.*;
//import org.apache.log4j.Logger;
import tcl.lang.*;

class GetCmd implements Command {

    private final static GetCmd instance = new GetCmd();
    //private final static Logger logger = Logger.getLogger(GetCmd.class);

    private String server;
    //private String domain;
    private String mbean;
    private String attrop;
    private Options opts;

    static GetCmd getInstance() {
        return instance;
    }

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

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

        this.opts.addOption(OptionBuilder.withLongOpt("mbean").withDescription("MBean containing attribute.")
                .withArgName("MBEAN").hasArg().create("m"));

        this.opts.addOption(OptionBuilder.withLongOpt("noconvert")
                .withDescription(
                        "Do not auto-convert the result to a Tcl string, instead create a java object reference.")
                .hasArg(false).create("n"));

        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 getDefaults(Interp interp) {
        this.server = null;
        //domain = null;
        this.mbean = null;
        this.attrop = null;

        try {
            this.server = interp.getVar("SERVER", TCL.GLOBAL_ONLY).toString();
            //domain = interp.getVar("DOMAIN", TCL.GLOBAL_ONLY).toString();
            this.mbean = interp.getVar("MBEAN", TCL.GLOBAL_ONLY).toString();
            this.attrop = interp.getVar("ATTROP", 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 attribute = null;

            if (cl.hasOption("help")) {
                new HelpFormatter().printHelp("jmx_get [-?] [-n] [-s server] [-m mbean] [ATTRIBUTE]",
                        "======================================================================", this.opts,
                        "======================================================================", false);
                System.out.println("jmx_get retrieves the current value of the given attribute.");
                System.out.println("If you do not specify server, mbean, or ATTRIBUTE, then the");
                System.out.println("values in the global variables SERVER, MBEAN, and ATTROP,");
                System.out.println("respectively, will be used.");
                System.out.println("");
                System.out.println("If you specify -n, then the return will be a Java/Tcl java");
                System.out.println("object reference.  See the Java/Tcl documentation on the");
                System.out.println("internet for more details.");
                return;
            }

            getDefaults(interp);

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

            if (args.length > 0) {
                attribute = args[0];
            } else {
                attribute = this.attrop;
            }

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

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

            if (attribute == null) {
                throw new TclException(interp,
                        "No attribute specified; please set ATTROP variable or add it to the command line.",
                        TCL.ERROR);
            }

            if (cl.hasOption("noconvert")) {
                String result = Utils.java2tcl(Jmx.getInstance().getAttribute(this.server, this.mbean, attribute));
                interp.setResult(result);
            } else {
                interp.setResult(Jmx.getInstance().getAttribute(this.server, this.mbean, attribute).toString());
            }
        } catch (ParseException e) {
            throw new TclException(interp, e.getMessage(), 1);
        } catch (RuntimeException e) {
            throw new TclException(interp, "Cannot convert result to a string.", 1);
        }
    }

}