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Java example source code file (InputArguments.java)

This example Java source code file (InputArguments.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

inputarguments, list, management, runtimemxbean, string, util

The InputArguments.java Java example source code

/*
 * Copyright (c) 2013, 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.
 */

package com.oracle.java.testlibrary;

import java.lang.management.RuntimeMXBean;
import java.lang.management.ManagementFactory;
import java.util.List;

/**
 * This class provides access to the input arguments to the VM.
 */
public class InputArguments {
    private static final List<String> args;

    static {
        RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
        args = runtimeMxBean.getInputArguments();
    }

    /**
     * Returns true if {@code arg} is an input argument to the VM.
     *
     * This is useful for checking boolean flags such as -XX:+UseSerialGC or
     * -XX:-UsePerfData.
     *
     * @param arg The name of the argument.
     * @return {@code true} if the given argument is an input argument,
     *         otherwise {@code false}.
     */
    public static boolean contains(String arg) {
        return args.contains(arg);
    }

    /**
     * Returns true if {@code prefix} is the start of an input argument to the
     * VM.
     *
     * This is useful for checking if flags describing a quantity, such as
     * -XX:+MaxMetaspaceSize=100m, is set without having to know the quantity.
     * To check if the flag -XX:MaxMetaspaceSize is set, use
     * {@code InputArguments.containsPrefix("-XX:MaxMetaspaceSize")}.
     *
     * @param prefix The start of the argument.
     * @return {@code true} if the given argument is the start of an input
     *         argument, otherwise {@code false}.
     */
    public static boolean containsPrefix(String prefix) {
        for (String arg : args) {
            if (arg.startsWith(prefix)) {
                return true;
            }
        }
        return false;
    }
}

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