DcmdUtil.java

/*
 * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

import sun.management.ManagementFactoryHelper;

import com.sun.management.DiagnosticCommandMBean;

public class DcmdUtil
{
    public static String executeDcmd(String cmd, String ... args) {
        DiagnosticCommandMBean dcmd = ManagementFactoryHelper.getDiagnosticCommandMBean();
        Object[] dcmdArgs = {args};
        String[] signature = {String[].class.getName()};

        try {
            System.out.print("> " + cmd + " ");
            for (String s : args) {
                System.out.print(s + " ");
            }
            System.out.println(":");
            String result = (String) dcmd.invoke(transform(cmd), dcmdArgs, signature);
            System.out.println(result);
            return result;
        } catch(Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    private static String transform(String name) {
        StringBuilder sb = new StringBuilder();
        boolean toLower = true;
        boolean toUpper = false;
        for (int i = 0; i < name.length(); i++) {
            char c = name.charAt(i);
            if (c == '.' || c == '_') {
                toLower = false;
                toUpper = true;
            } else {
                if (toUpper) {
                    toUpper = false;
                    sb.append(Character.toUpperCase(c));
                } else if(toLower) {
                    sb.append(Character.toLowerCase(c));
                } else {
                    sb.append(c);
                }
            }
        }
        return sb.toString();
    }

}