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/*
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*
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*
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* and Distribution License("CDDL") (collectively, the "License"). You
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*/
package org.glassfish.admin.amx.util;
import java.lang.reflect.Array;
/**
Provides:
- utility to check for equality
*/
public final class ArrayUtil
{
private ArrayUtil()
{
// disallow instantiation
}
public static boolean arraysEqual(final Object array1, final Object array2)
{
boolean equal = array1 == array2;
if (equal)
{
// same object or both null
return (true);
}
else if (array1 == null || array2 == null)
{
return (false);
}
if (array1.getClass() == array2.getClass() &&
ClassUtil.objectIsArray(array1) &&
Array.getLength(array1) == Array.getLength(array2))
{
equal = true;
final int length = Array.getLength(array1);
for (int i = 0; i < length; ++i)
{
final Object a1 = Array.get(array1, i);
final Object a2 = Array.get(array2, i);
if (a1 != a2)
{
if (a1 == null || a2 == null)
{
equal = false;
}
else if (ClassUtil.objectIsArray(a1))
{
if (!arraysEqual(a1, a2))
{
equal = false;
}
}
}
if (!equal)
{
break;
}
}
}
return (equal);
}
public static boolean arrayContainsNulls(final Object[] array)
{
boolean containsNulls = false;
for (int i = 0; i < array.length; ++i)
{
if (array[i] == null)
{
containsNulls = true;
break;
}
}
return (containsNulls);
}
@SuppressWarnings("unchecked") // inherent/unavoidable for this method
public static T[] newArray(final Class theClass, int numItems)
{
return (T[]) (Array.newInstance(theClass, numItems));
}
/**
Create a new array from the original.
@param items the original array
@param startIndex index of the first item
@param numItems
@return an array of the same type, containing numItems items
*/
public static T[] newArray(
final T[] items,
final int startIndex,
final int numItems)
{
final Class theClass = TypeCast.asClass(items.getClass().getComponentType());
final T[] result = newArray(theClass, numItems);
System.arraycopy(items, startIndex, result, 0, numItems);
return (result);
}
/**
Create a new array consisting of originals and new.
@param items1 1st array
@param items2 2nd array
@return an array of the same type as items1, its elements first
*/
public static T[] newArray(
final T[] items1,
final T[] items2)
{
final Class class1 = TypeCast.asClass(items1.getClass().getComponentType());
final Class class2 = TypeCast.asClass(items2.getClass().getComponentType());
if (!class1.isAssignableFrom(class2))
{
throw new IllegalArgumentException();
}
final int length1 = Array.getLength(items1);
final int length2 = Array.getLength(items2);
final T[] result = newArray(class1, length1 + length2);
System.arraycopy(items1, 0, result, 0, length1);
System.arraycopy(items2, 0, result, length1, length2);
return (result);
}
/**
Create a new array consisting of an original array, and a single new item.
@param items an array
@param item an item to append
@return an array of the same type as items1, its elements first
*/
public static T[] newArray(
final T[] items,
final T item)
{
final Class theClass = TypeCast.asClass(items.getClass().getComponentType());
final T[] result = newArray(theClass, items.length + 1);
System.arraycopy(items, 0, result, 0, items.length);
result[result.length - 1] = item;
return (result);
}
}