gt: 			if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
context: package pt.karambola.commons.util ;
  
  import java.lang.reflect.Array;
  import java.util.Arrays;
  
  /**
   * Miscellaneous object utility methods.
   *
   * <p>consider
   * <a href="http://jakarta.apache.org/commons/lang/">Jakarta's Commons Lang</a>
   * for a more comprehensive suite of object utilities.
   *
   * <p>Thanks to Alex Ruiz for contributing several enhancements to this class!
   *
   * @author Juergen Hoeller
   * @author Keith Donald
   * @author Rod Johnson
   * @author Rob Harrop
   * @author Chris Beams
   * @since 19.03.2004
   * @see org.apache.commons.lang.ObjectUtils
   */
  public
  abstract class
  ObjectUtils
  {
  	private static final int INITIAL_HASH = 7;
  	private static final int MULTIPLIER = 31;
  
  	private static final String EMPTY_STRING            = "" ;
  	private static final String NULL_STRING             = "null" ;
  	private static final String ARRAY_START             = "[" ;
  	private static final String ARRAY_END               = "]" ;
  	private static final String EMPTY_ARRAY             = ARRAY_START + ARRAY_END ;
  	private static final String ARRAY_ELEMENT_SEPARATOR = ", " ;
  
  
  	/**
  	 * Return whether the given throwable is a checked exception:
  	 * that is, neither a RuntimeException nor an Error.
  	 * @param ex the throwable to check
  	 * @return whether the throwable is a checked exception
  	 * @see java.lang.Exception
  	 * @see java.lang.RuntimeException
  	 * @see java.lang.Error
  	 */
  	public static boolean isCheckedException(Throwable ex) {
  		return !(ex instanceof RuntimeException || ex instanceof Error);
  	}
  
  	/**
  	 * Check whether the given exception is compatible with the exceptions
  	 * declared in a throws clause.
  	 * @param ex the exception to checked
  	 * @param declaredExceptions the exceptions declared in the throws clause
  	 * @return whether the given exception is compatible
  	 */
  	public static
  	boolean
  	isCompatibleWithThrowsClause(Throwable ex, Class[] declaredExceptions)
  	{
  		if (!isCheckedException(ex)) {
  			return true;
  		}
  		if (declaredExceptions != null) {
  			int i = 0;
  			while (i < declaredExceptions.length) {
  				if (declaredExceptions[i].isAssignableFrom(ex.getClass())) {
  					return true;
  				}
  				i++;
  			}
  		}
  		return false;
  	}
  
  	/**
  	 * Determine whether the given object is an array:
  	 * either an Object array or a primitive array.
  	 * @param obj the object to check
  	 */
  	public static boolean isArray(Object obj) {
  		return (obj != null && obj.getClass().isArray());
  	}
  
  	/**
  	 * Determine whether the given array is empty:
  	 * i.e. <code>null</code> or of zero length.
  	 * @param array the array to check
  	 */
  	public static boolean isEmpty(Object[] array) {
  		return (array == null || array.length == 0);
  	}
  
  	/**
  	 * Check whether the given array contains the given element.
  	 * @param array the array to check (may be <code>null</code>,
  	 * in which case the return value will always be <code>false</code>)
  	 * @param element the element to check for
  	 * @return whether the element has been found in the given array
  	 */
  	public static boolean containsElement(Object[] array, Object element) {
  		if (array == null) {
  			return false;
  		}
  		for (Object arrayEle : array) {
  			if (nullSafeEquals(arrayEle, element)) {
  				return true;
  			}
  		}
  		return false;
  	}
  
  	/**
  	 * Check whether the given array of enum constants contains a constant with the given name,
  	 * ignoring case when determining a match.
  	 * @param enumValues the enum values to check, typically the product of a call to MyEnum.values()
  	 * @param constant the constant name to find (must not be null or empty string)
  	 * @return whether the constant has been found in the given array
  	 */
  	public static boolean containsConstant(Enum<?>[] enumValues, String constant) {
  		return containsConstant(enumValues, constant, false);
  	}
  
  	/**
  	 * Check whether the given array of enum constants contains a constant with the given name.
  	 * @param enumValues the enum values to check, typically the product of a call to MyEnum.values()
  	 * @param constant the constant name to find (must not be null or empty string)
  	 * @param caseSensitive whether case is significant in determining a match
  	 * @return whether the constant has been found in the given array
  	 */
  	public static boolean containsConstant(Enum<?>[] enumValues, String constant, boolean caseSensitive) {
  		for (Enum<?> candidate : enumValues) {
  			if (caseSensitive ?
  					candidate.toString().equals(constant) :
  						candidate.toString().equalsIgnoreCase(constant)) {
  				return true;
  			}
  		}
  		return false;
  	}
  
  	/**
  	 * Case insensitive alternative to {@link Enum#valueOf(Class, String)}.
  	 * @param <E> the concrete Enum type
  	 * @param enumValues the array of all Enum constants in question, usually per Enum.values()
  	 * @param constant the constant to get the enum value of
  	 * @throws IllegalArgumentException if the given constant is not found in the given array
  	 * of enum values. Use {@link #containsConstant(Enum[], String)} as a guard to avoid this exception.
  	 */
  	public static <E extends Enum<?>> E caseInsensitiveValueOf(E[] enumValues, String constant) {
  		for (E candidate : enumValues) {
  			if(candidate.toString().equalsIgnoreCase(constant)) {
  				return candidate;
  			}
  		}
  		throw new IllegalArgumentException(
  				String.format("constant [%s] does not exist in enum type %s",
  						constant, enumValues.getClass().getComponentType().getName()));
  	}
  
  	/**
  	 * Append the given object to the given array, returning a new array
  	 * consisting of the input array contents plus the given object.
  	 * @param array the array to append to (can be <code>null</code>)
  	 * @param obj the object to append
  	 * @return the new array (of the same component type; never <code>null</code>)
  	 */
  	public static <A,O extends A> A[] addObjectToArray(A[] array, O obj) {
  		Class<?> compType = Object.class;
  		if (array != null) {
  			compType = array.getClass().getComponentType();
  		}
  		else if (obj != null) {
  			compType = obj.getClass();
  		}
  		int newArrLength = (array != null ? array.length + 1 : 1);
  		@SuppressWarnings("unchecked")
  		A[] newArr = (A[]) Array.newInstance(compType, newArrLength);
  		if (array != null) {
  			System.arraycopy(array, 0, newArr, 0, array.length);
  		}
  		newArr[newArr.length - 1] = obj;
  		return newArr;
  	}
  
  	/**
  	 * Convert the given array (which may be a primitive array) to an
  	 * object array (if necessary of primitive wrapper objects).
  	 * <p>A <code>null</code> source value will be converted to an
  	 * empty Object array.
  	 * @param source the (potentially primitive) array
  	 * @return the corresponding object array (never <code>null</code>)
  	 * @throws IllegalArgumentException if the parameter is not an array
  	 */
  	public static Object[] toObjectArray(Object source) {
  		if (source instanceof Object[]) {
  			return (Object[]) source;
  		}
  		if (source == null) {
  			return new Object[0];
  		}
  		if (!source.getClass().isArray()) {
  			throw new IllegalArgumentException("Source is not an array: " + source);
  		}
  		int length = Array.getLength(source);
  		if (length == 0) {
  			return new Object[0];
  		}
  		Class wrapperType = Array.get(source, 0).getClass();
  		Object[] newArray = (Object[]) Array.newInstance(wrapperType, length);
  		for (int i = 0; i < length; i++) {
  			newArray[i] = Array.get(source, i);
  		}
  		return newArray;
  	}
  
  
  	//---------------------------------------------------------------------
  	// Convenience methods for content-based equality/hash-code handling
  	//---------------------------------------------------------------------
  
  	/**
  	 * Determine if the given objects are equal, returning <code>true</code>
  	 * if both are <code>null</code> or <code>false</code> if only one is
  	 * <code>null</code>.
  	 * <p>Compares arrays with <code>Arrays.equals</code>, performing an equality
  	 * check based on the array elements rather than the array reference.
  	 * @param o1 first Object to compare
  	 * @param o2 second Object to compare
  	 * @return whether the given objects are equal
  	 * @see java.util.Arrays#equals
  	 */
  	public static boolean nullSafeEquals(Object o1, Object o2) {
  		if (o1 == o2) {
  			return true;
  		}
  		if (o1 == null || o2 == null) {
  			return false;
  		}
  		if (o1.equals(o2)) {
  			return true;
  		}
  		if (o1.getClass().isArray() && o2.getClass().isArray()) {
  			if (o1 instanceof Object[] && o2 instanceof Object[]) {
  				return Arrays.equals((Object[]) o1, (Object[]) o2);
  			}
  