/**
 * L2FProd.com Common Components 7.3 License.
 *
 * Copyright 2005-2007 L2FProd.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.l2fprod.common.util;

/**
 * Deals with the different version of the Java Virtual Machine. <br>
 */
public class JVM {

  public final static int JDK1_0 = 10;
  public final static int JDK1_1 = 11;
  public final static int JDK1_2 = 12;
  public final static int JDK1_3 = 13;
  public final static int JDK1_4 = 14;
  public final static int JDK1_5 = 15;
  public final static int JDK1_6 = 16;

  private static JVM current;
  static {
    current = new JVM();
  }

  /**
   * @return the current JVM object
   */
  public static JVM current() {
    return current;
  }

  private int jdkVersion;

  /**
   * Creates a new JVM data from the <code>java.version</code>
   * System property
   *  
   */
  public JVM() {
    this(System.getProperty("java.version"));
  }

  /**
   * Constructor for the OS object
   */
  public JVM(String p_JavaVersion) {
    if (p_JavaVersion.startsWith("1.6.")) {
      jdkVersion = JDK1_6;
    } else if (p_JavaVersion.startsWith("1.5.")) {
      jdkVersion = JDK1_5;
    } else if (p_JavaVersion.startsWith("1.4.")) {
      jdkVersion = JDK1_4;
    } else if (p_JavaVersion.startsWith("1.3.")) {
      jdkVersion = JDK1_3;
    } else if (p_JavaVersion.startsWith("1.2.")) {
      jdkVersion = JDK1_2;
    } else if (p_JavaVersion.startsWith("1.1.")) {
      jdkVersion = JDK1_1;
    } else if (p_JavaVersion.startsWith("1.0.")) {
      jdkVersion = JDK1_0;
    } else {
      // unknown version, assume 1.3
      jdkVersion = JDK1_3;
    }
  }

  public boolean isOrLater(int p_Version) {
    return jdkVersion >= p_Version;
  }

  public boolean isOneDotOne() {
    return jdkVersion == JDK1_1;
  }

  public boolean isOneDotTwo() {
    return jdkVersion == JDK1_2;
  }

  public boolean isOneDotThree() {
    return jdkVersion == JDK1_3;
  }

  public boolean isOneDotFour() {
    return jdkVersion == JDK1_4;
  }

  public boolean isOneDotFive() {
    return jdkVersion == JDK1_5;
  }

  public boolean isOneDotSix() {
    return jdkVersion == JDK1_6;
  }

}