UtilUnsafe.java

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package com.cliffc.aa.util;
  
import java.lang.reflect.Field;
 
import sun.misc.Unsafe;
 
public class UtilUnsafe {
  private UtilUnsafe() { } // dummy private constructor
  static final Unsafe UNSAFE = getUnsafe();
  public static Unsafe getUnsafe() {
    // Not on bootclasspath
    if( UtilUnsafe.class.getClassLoader() == null )
      return Unsafe.getUnsafe();
    try {
      final Field fld = Unsafe.class.getDeclaredField("theUnsafe");
      fld.setAccessible(true);
      return (Unsafe) fld.get(UtilUnsafe.class);
    } catch (Exception e) {
      throw new RuntimeException("Could not obtain access to sun.misc.Unsafe", e);
    }
  }
 
  static final long fieldOffset( Class clz, String field ) {
    Field f = null;
    try { f = clz.getDeclaredField(field); }
    catch( java.lang.NoSuchFieldException e ) { throw new RuntimeException(e); }
    return UNSAFE.objectFieldOffset(f);
  }
}