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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */
package com.sun.grizzly.util;

/**
 *
 * @since 1.9.59
 */
public class JdkVersion implements Comparable {
    private static final boolean IS_UNSAFE_SUPPORTED;
    
    static {
        
        boolean isUnsafeFound;
        
        try {
            isUnsafeFound = Class.forName("sun.misc.Unsafe") != null;
        } catch (Throwable t) {
            isUnsafeFound = false;
        }
        
        IS_UNSAFE_SUPPORTED = isUnsafeFound;        
    }    

    private static final JdkVersion UNKNOWN_VERSION = new JdkVersion(-1, -1, -1, -1);
    private static final JdkVersion JDK_VERSION = parseVersion(System.getProperty("java.version"));

    private final int major;
    private final int minor;
    private final int maintenance;
    private final int update;

    // ------------------------------------------------------------ Constructors

    private JdkVersion(final int major,
                       final int minor,
                       final int maintenance,
                       final int update) {
        this.major = major;
        this.minor = minor;
        this.maintenance = maintenance;
        this.update = update;
    }

    // ---------------------------------------------------------- Public Methods

    public static JdkVersion parseVersion(String versionString) {
        try {
            int dashIdx = versionString.indexOf('-');
            if (dashIdx != -1) {
                versionString = versionString.substring(0, dashIdx);
            }
            String[] parts = versionString.split("\\.|_");
            if (parts.length == 3) {
                return new JdkVersion(Integer.parseInt(parts[0]),
                        Integer.parseInt(parts[1]),
                        Integer.parseInt(parts[2]),
                        0);
            } else {
                return new JdkVersion(Integer.parseInt(parts[0]),
                        Integer.parseInt(parts[1]),
                        Integer.parseInt(parts[2]),
                        Integer.parseInt(parts[3]));
            }
        } catch (Exception e) {
            return UNKNOWN_VERSION;
        }
    }

    public static JdkVersion getJdkVersion() {
        return JDK_VERSION;
    }

    @SuppressWarnings("UnusedDeclaration")
    public int getMajor() {
        return major;
    }

    @SuppressWarnings("UnusedDeclaration")
    public int getMinor() {
        return minor;
    }

    @SuppressWarnings("UnusedDeclaration")
    public int getMaintenance() {
        return maintenance;
    }

    @SuppressWarnings("UnusedDeclaration")
    public int getUpdate() {
        return update;
    }

    /**
     * Returns true if sun.misc.Unsafe is present in the
     * current JDK version, or false otherwise.
     * 
     * @since 1.9.59
     */
    public boolean isUnsafeSupported() {
        return IS_UNSAFE_SUPPORTED;
    }
    
    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append("JdkVersion");
        sb.append("{major=").append(major);
        sb.append(", minor=").append(minor);
        sb.append(", maintenance=").append(maintenance);
        sb.append(", update=").append(update);
        sb.append('}');
        return sb.toString();
    }

    // ------------------------------------------------- Methods from Comparable

    public int compareTo(String versionString) {
        return compareTo(JdkVersion.parseVersion(versionString));
    }

    @Override
    public int compareTo(JdkVersion otherVersion) {
        if (major < otherVersion.major) {
            return -1;
        }
        if (major > otherVersion.major) {
            return 1;
        }
        if (minor < otherVersion.minor) {
            return -1;
        }
        if (minor > otherVersion.minor) {
            return 1;
        }
        if (maintenance < otherVersion.maintenance) {
            return -1;
        }
        if (maintenance > otherVersion.maintenance) {
            return 1;
        }
        if (update < otherVersion.update) {
            return -1;
        }
        if (update > otherVersion.update) {
            return 1;
        }
        return 0;
    }

    public static void main(String[] args) {
        JdkVersion jdkVersion = JdkVersion.parseVersion("1.6.0");
        JdkVersion minimumVersion = JdkVersion.parseVersion("1.7.0");
        System.out.println(minimumVersion.compareTo(jdkVersion));
    }
}