src/jdk.jfr/share/classes/jdk/jfr/internal/cmd/Execute.java

/*
 * Copyright (c) 2016, 2018, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

package jdk.jfr.internal.cmd;

import java.util.Arrays;
import java.util.Deque;
import java.util.LinkedList;

/**
 * Launcher class for JFR tools
 *
 */
public final class Execute {

    public static void main(String... args) {
        Deque<String> argList = new LinkedList<>(Arrays.asList(args));
        if (argList.isEmpty()) {
            System.out.println();
            Command.displayHelp();
            return;
        }
        String command = argList.remove();
        for (Command c : Command.getCommands()) {
            if (c.getName().equals(command)) {
                try {
                    c.execute(argList);
                } catch (IllegalArgumentException iae) {
                    return; // already handled by command
                } catch (Throwable e) {
                    System.out.println();
                    System.out.println(e.getMessage());
                    System.out.println();
                }
                return;
            }
        }
        System.out.println();
        System.out.println("Unknown command " + command + ".");
        System.out.println();
        Command.displayHelp();
    }
}