/*
    * Copyright 2002-2007 the original author or authors.
    *
    * 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 org.argeo.osgi.boot.internal.springutil;
  
  import java.lang.reflect.Array;
  import java.util.Arrays;
  
  /**
   * Miscellaneous object utility methods. Mainly for internal use within the
   * framework; consider Jakarta's Commons Lang for a more comprehensive suite
   * of object utilities.
   *
   * @author Juergen Hoeller
   * @author Keith Donald
   * @author Rod Johnson
   * @author Rob Harrop
   * @author Alex Ruiz
   * @since 19.03.2004
   */
  @SuppressWarnings({ "rawtypes", "unchecked" })
  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) {
  			for (int i = 0; i < declaredExceptions.length; i++) {
  				if (declaredExceptions[i].isAssignableFrom(ex.getClass())) {
  					return true;
  				}
  			}
  		}
  		return false;
  	}
  
  	/**
  	 * Return whether the given array is empty: that is, <code>null</code>
  	 * or of zero length.
  	 * @param array the array to check
  	 * @return whether the given array is empty
  	 */
  	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 (int i = 0; i < array.length; i++) {
 			if (nullSafeEquals(array[i], element)) {
 				return true;
 			}
 		}
 		return false;
 	}
 
 	/**
 	 * 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 Object[] addObjectToArray(Object[] array, Object 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);
 		Object[] newArr = (Object[]) 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);
 			}
 			if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
 				return Arrays.equals((boolean[]) o1, (boolean[]) o2);
 			}
 			if (o1 instanceof byte[] && o2 instanceof byte[]) {
 				return Arrays.equals((byte[]) o1, (byte[]) o2);
 			}
 			if (o1 instanceof char[] && o2 instanceof char[]) {
 				return Arrays.equals((char[]) o1, (char[]) o2);
 			}
 			if (o1 instanceof double[] && o2 instanceof double[]) {
 				return Arrays.equals((double[]) o1, (double[]) o2);
 			}
 			if (o1 instanceof float[] && o2 instanceof float[]) {
 				return Arrays.equals((float[]) o1, (float[]) o2);
 			}
 			if (o1 instanceof int[] && o2 instanceof int[]) {
 				return Arrays.equals((int[]) o1, (int[]) o2);
 			}
 			if (o1 instanceof long[] && o2 instanceof long[]) {
 				return Arrays.equals((long[]) o1, (long[]) o2);
 			}
 			if (o1 instanceof short[] && o2 instanceof short[]) {
 				return Arrays.equals((short[]) o1, (short[]) o2);
 			}
 		}
 		return false;
 	}
 
 	/**
 	 * Return as hash code for the given object; typically the value of
 	 * <code>{@link Object#hashCode()}</code>. If the object is an array,
 	 * this method will delegate to any of the <code>nullSafeHashCode</code>
 	 * methods for arrays in this class. If the object is <code>null</code>,
 	 * this method returns 0.
 	 * @see #nullSafeHashCode(Object[])
 	 * @see #nullSafeHashCode(boolean[])
 	 * @see #nullSafeHashCode(byte[])
 	 * @see #nullSafeHashCode(char[])
 	 * @see #nullSafeHashCode(double[])
 	 * @see #nullSafeHashCode(float[])
 	 * @see #nullSafeHashCode(int[])
 	 * @see #nullSafeHashCode(long[])
 	 * @see #nullSafeHashCode(short[])
 	 */
 	public static int nullSafeHashCode(Object obj) {
 		if (obj == null) {
 			return 0;
 		}
 		if (obj.getClass().isArray()) {
 			if (obj instanceof Object[]) {
 				return nullSafeHashCode((Object[]) obj);
 			}
 			if (obj instanceof boolean[]) {
 				return nullSafeHashCode((boolean[]) obj);
 			}
 			if (obj instanceof byte[]) {
 				return nullSafeHashCode((byte[]) obj);
 			}
 			if (obj instanceof char[]) {
 				return nullSafeHashCode((char[]) obj);
 			}
 			if (obj instanceof double[]) {
 				return nullSafeHashCode((double[]) obj);
 			}
 			if (obj instanceof float[]) {
 				return nullSafeHashCode((float[]) obj);
 			}
 			if (obj instanceof int[]) {
 				return nullSafeHashCode((int[]) obj);
 			}
 			if (obj instanceof long[]) {
 				return nullSafeHashCode((long[]) obj);
 			}
 			if (obj instanceof short[]) {
 				return nullSafeHashCode((short[]) obj);
 			}
 		}
 		return obj.hashCode();
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(Object[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + nullSafeHashCode(array[i]);
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(boolean[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + hashCode(array[i]);
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(byte[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + array[i];
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(char[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + array[i];
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(double[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + hashCode(array[i]);
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(float[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + hashCode(array[i]);
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(int[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + array[i];
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(long[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + hashCode(array[i]);
 		}
 		return hash;
 	}
 
 	/**
 	 * Return a hash code based on the contents of the specified array.
 	 * If <code>array</code> is <code>null</code>, this method returns 0.
 	 */
 	public static int nullSafeHashCode(short[] array) {
 		if (array == null) {
 			return 0;
 		}
 		int hash = INITIAL_HASH;
 		int arraySize = array.length;
 		for (int i = 0; i < arraySize; i++) {
 			hash = MULTIPLIER * hash + array[i];
 		}
 		return hash;
 	}
 
 	/**
 	 * Return the same value as <code>{@link Boolean#hashCode()}</code>.
 	 * @see Boolean#hashCode()
 	 */
 	public static int hashCode(boolean bool) {
 		return bool ? 1231 : 1237;
 	}
 
 	/**
 	 * Return the same value as <code>{@link Double#hashCode()}</code>.
 	 * @see Double#hashCode()
 	 */
 	public static int hashCode(double dbl) {
 		long bits = Double.doubleToLongBits(dbl);
 		return hashCode(bits);
 	}
 
 	/**
 	 * Return the same value as <code>{@link Float#hashCode()}</code>.
 	 * @see Float#hashCode()
 	 */
 	public static int hashCode(float flt) {
 		return Float.floatToIntBits(flt);
 	}
 
 	/**
 	 * Return the same value as <code>{@link Long#hashCode()}</code>.
 	 * @see Long#hashCode()
 	 */
 	public static int hashCode(long lng) {
 		return (int) (lng ^ (lng >>> 32));
 	}
 
 
 	//---------------------------------------------------------------------
 	// Convenience methods for toString output
 	//---------------------------------------------------------------------
 
 	/**
 	 * Return a String representation of an object's overall identity.
 	 * @param obj the object (may be <code>null</code>)
 	 * @return the object's identity as String representation,
 	 * or an empty String if the object was <code>null</code>
 	 */
 	public static String identityToString(Object obj) {
 		if (obj == null) {
 			return EMPTY_STRING;
 		}
 		return obj.getClass().getName() + "@" + getIdentityHexString(obj);
 	}
 
 	/**
 	 * Return a hex String form of an object's identity hash code.
 	 * @param obj the object
 	 * @return the object's identity code in hex notation
 	 */
 	public static String getIdentityHexString(Object obj) {
 		return Integer.toHexString(System.identityHashCode(obj));
 	}
 
 	/**
 	 * Return a content-based String representation if <code>obj</code> is
 	 * not <code>null</code>; otherwise returns an empty String.
 	 * <p>Differs from {@link #nullSafeToString(Object)} in that it returns
 	 * an empty String rather than "null" for a <code>null</code> value.
 	 * @param obj the object to build a display String for
 	 * @return a display String representation of <code>obj</code>
 	 * @see #nullSafeToString(Object)
 	 */
 	public static String getDisplayString(Object obj) {
 		if (obj == null) {
 			return EMPTY_STRING;
 		}
 		return nullSafeToString(obj);
 	}
 
 	/**
 	 * Determine the class name for the given object.
 	 * <p>Returns <code>"null"</code> if <code>obj</code> is <code>null</code>.
 	 * @param obj the object to introspect (may be <code>null</code>)
 	 * @return the corresponding class name
 	 */
 	public static String nullSafeClassName(Object obj) {
 		return (obj != null ? obj.getClass().getName() : NULL_STRING);
 	}
 
 	/**
 	 * Return a String representation of the specified Object.
 	 * <p>Builds a String representation of the contents in case of an array.
 	 * Returns <code>"null"</code> if <code>obj</code> is <code>null</code>.
 	 * @param obj the object to build a String representation for
 	 * @return a String representation of <code>obj</code>
 	 */
 	public static String nullSafeToString(Object obj) {
 		if (obj == null) {
 			return NULL_STRING;
 		}
 		if (obj instanceof String) {
 			return (String) obj;
 		}
 		if (obj instanceof Object[]) {
 			return nullSafeToString((Object[]) obj);
 		}
 		if (obj instanceof boolean[]) {
 			return nullSafeToString((boolean[]) obj);
 		}
 		if (obj instanceof byte[]) {
 			return nullSafeToString((byte[]) obj);
 		}
 		if (obj instanceof char[]) {
 			return nullSafeToString((char[]) obj);
 		}
 		if (obj instanceof double[]) {
 			return nullSafeToString((double[]) obj);
 		}
 		if (obj instanceof float[]) {
 			return nullSafeToString((float[]) obj);
 		}
 		if (obj instanceof int[]) {
 			return nullSafeToString((int[]) obj);
 		}
 		if (obj instanceof long[]) {
 			return nullSafeToString((long[]) obj);
 		}
 		if (obj instanceof short[]) {
 			return nullSafeToString((short[]) obj);
 		}
 		String str = obj.toString();
 		return (str != null ? str : EMPTY_STRING);
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(Object[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 			buffer.append(String.valueOf(array[i]));
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(boolean[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 
 			buffer.append(array[i]);
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(byte[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 			buffer.append(array[i]);
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(char[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 			buffer.append("'").append(array[i]).append("'");
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(double[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 
 			buffer.append(array[i]);
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(float[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 
 			buffer.append(array[i]);
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(int[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 			buffer.append(array[i]);
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(long[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 			buffer.append(array[i]);
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 	/**
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
 	 * by the characters <code>", "</code> (a comma followed by a space). Returns
 	 * <code>"null"</code> if <code>array</code> is <code>null</code>.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of <code>array</code>
 	 */
 	public static String nullSafeToString(short[] array) {
 		if (array == null) {
 			return NULL_STRING;
 		}
 		int length = array.length;
 		if (length == 0) {
 			return EMPTY_ARRAY;
 		}
 		StringBuffer buffer = new StringBuffer();
 		for (int i = 0; i < length; i++) {
 			if (i == 0) {
 				buffer.append(ARRAY_START);
 			}
 			else {
 				buffer.append(ARRAY_ELEMENT_SEPARATOR);
 			}
 			buffer.append(array[i]);
 		}
 		buffer.append(ARRAY_END);
 		return buffer.toString();
 	}
 
 }