/*

 * 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

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 */

package jdk.management.jfr;

import java.lang.management.ManagementPermission;

import java.security.Permission;

import java.time.DateTimeException;

import java.time.Duration;

import java.time.Instant;

import java.time.format.DateTimeParseException;

import java.util.List;

import java.util.function.Function;

import java.util.stream.Collectors;

import javax.management.MalformedObjectNameException;

import javax.management.ObjectName;

import jdk.jfr.internal.management.ManagementSupport;

final class MBeanUtils {

    private static final Permission monitor = new ManagementPermission("monitor");

    private static final Permission control = new ManagementPermission("control");

    static ObjectName createObjectName() {

        try {

            return new ObjectName(FlightRecorderMXBean.MXBEAN_NAME);

        } catch (MalformedObjectNameException mne) {

            throw new Error("Can't happen", mne);

        }

    }

    static void checkControl() {

        SecurityManager secManager = System.getSecurityManager();

        if (secManager != null) {

            secManager.checkPermission(control);

        }

    }

    static void checkMonitor() {

        SecurityManager secManager = System.getSecurityManager();

        if (secManager != null) {

            secManager.checkPermission(monitor);

        }

    }

    static <T, R> List<R> transformList(List<T> source, Function<T, R> function) {

        return source.stream().map(function).collect(Collectors.toList());

    }

    static boolean booleanValue(String s) {

        if ("true".equals(s)) {

            return true;

        }

        if ("false".equals(s)) {

            return false;

        }

        throw new IllegalArgumentException("Value must be true or false.");

    }

    static Duration duration(String s) throws NumberFormatException {

        if (s == null) {

            return null;

        }

        long l = ManagementSupport.parseTimespan(s);

        if (l == 0) {

            return null;

        }

        return Duration.ofNanos(l);

    }

    public static Instant parseTimestamp(String s, Instant defaultValue) {

        if (s == null) {

            return defaultValue;

        }

        try {

            return Instant.parse(s);

        } catch(DateTimeParseException e ) {

            // OK, try with milliseconds since epoch

            // before giving up.

        }

        try {

            return Instant.ofEpochMilli(Long.parseLong(s));

        } catch (NumberFormatException | DateTimeException nfr) {

            throw new IllegalArgumentException("Not a valid timestamp " + s);

        }

    }

    static Long size(String s) throws NumberFormatException {

        long size = Long.parseLong(s);

        if (size < 0) {

            throw new IllegalArgumentException("Negative size not allowed");

        }

        return size;

    }

    public static int parseBlockSize(String string, int defaultSize) {

        if (string == null) {

            return defaultSize;

        }

        int size = Integer.parseInt(string);

        if (size <1)  {

            throw new IllegalArgumentException("Block size must be at least 1 byte");

        }

        return size;

    }

}