com.calitha.util
Class Util

java.lang.Object
  com.calitha.util.Util

public final class Util
extends Object

The Util class provides several convenience methods making application development easier.

Author:

Robert van Loenhout

Constructor Summary

Util()

Method Summary

static <T> void	addArrayToCollection(Collection<T> collection, T[] array) Adds all elements of an array to a collection
static <T> T[]	appendArrays(T[] array1, T[] array2, Class<T> cls) Appends two arrays together.
static Boolean	equalsNoState(Object first, Object second) Determines if two objects are equal.
static <T> T[]	listToArray(List<T> list, Class<T> cls) Copies a list to an Object array.
static void	printArray(PrintStream stream, Object[] array) Copies an array to a print stream.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Util

public Util()

Method Detail

printArray

public static void printArray(PrintStream stream,
                              Object[] array)

Copies an array to a print stream.

Parameters:

stream - stream

array - array

Throws:

IllegalArgumentException - if an argument is null

appendArrays

public static <T> T[] appendArrays(T[] array1,
                                   T[] array2,
                                   Class<T> cls)

Appends two arrays together.

Parameters:

array1 - first array

array2 - second array

cls - class of the objects in the array

Returns:

new array

Throws:

IllegalArgumentException - if an argument is null

addArrayToCollection

public static <T> void addArrayToCollection(Collection<T> collection,
                                            T[] array)

Adds all elements of an array to a collection

Parameters:

collection - collection

array - array

Throws:

IllegalArgumentException - if an argument is null

listToArray

public static <T> T[] listToArray(List<T> list,
                                  Class<T> cls)

Copies a list to an Object array.

Parameters:

list - list that is used as input

cls - class of the objects in the list

Returns:

new object array

Throws:

IllegalArgumentException - if an argument is null

equalsNoState

public static Boolean equalsNoState(Object first,
                                    Object second)

Determines if two objects are equal.

The state is not taken into account if two objects are equal, and therefore this method can return null to signal that the internal state must be compared too before it can be determined if the objects are equal.

This method is useful as the first step in the equals method of objects.

Parameters:

first - first object

second - second object

Returns:

true if it is equal, false if is unequal, null if more tests are needed.