com.google.appengine.repackaged.org.eclispe.jetty.util.ArrayUtil Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Utility methods for Array manipulation
*/
public class ArrayUtil
implements Cloneable, Serializable
{
public static T[] removeFromArray(T[] array, Object item)
{
if (item == null || array == null)
return array;
for (int i = array.length; i-- > 0; )
{
if (item.equals(array[i]))
{
Class c = array == null ? item.getClass() : array.getClass().getComponentType();
@SuppressWarnings("unchecked")
T[] na = (T[])Array.newInstance(c, Array.getLength(array) - 1);
if (i > 0)
System.arraycopy(array, 0, na, 0, i);
if (i + 1 < array.length)
System.arraycopy(array, i + 1, na, i, array.length - (i + 1));
return na;
}
}
return array;
}
/**
* Add arrays
*
* @param array1 An array to add to (or null)
* @param array2 An array to add to (or null)
* @param the array entry type
* @return new array with contents of both arrays, or null if both arrays are null
*/
public static T[] add(T[] array1, T[] array2)
{
if (array1 == null || array1.length == 0)
return array2;
if (array2 == null || array2.length == 0)
return array1;
T[] na = Arrays.copyOf(array1, array1.length + array2.length);
System.arraycopy(array2, 0, na, array1.length, array2.length);
return na;
}
/**
* Add element to an array
*
* @param array The array to add to (or null)
* @param item The item to add
* @param type The type of the array (in case of null array)
* @param the array entry type
* @return new array with contents of array plus item
*/
public static T[] addToArray(T[] array, T item, Class type)
{
if (array == null)
{
if (type == null && item != null)
type = item.getClass();
@SuppressWarnings("unchecked")
T[] na = (T[])Array.newInstance(type, 1);
na[0] = item;
return na;
}
else
{
T[] na = Arrays.copyOf(array, array.length + 1);
na[array.length] = item;
return na;
}
}
/**
* Add element to the start of an array
*
* @param array The array to add to (or null)
* @param item The item to add
* @param type The type of the array (in case of null array)
* @param the array entry type
* @return new array with contents of array plus item
*/
public static T[] prependToArray(T item, T[] array, Class type)
{
if (array == null)
{
if (type == null && item != null)
type = item.getClass();
@SuppressWarnings("unchecked")
T[] na = (T[])Array.newInstance(type, 1);
na[0] = item;
return na;
}
else
{
Class c = array.getClass().getComponentType();
@SuppressWarnings("unchecked")
T[] na = (T[])Array.newInstance(c, Array.getLength(array) + 1);
System.arraycopy(array, 0, na, 1, array.length);
na[0] = item;
return na;
}
}
/**
* @param array Any array of object
* @param the array entry type
* @return A new modifiable list initialised with the elements from array.
*/
public static List asMutableList(E[] array)
{
if (array == null || array.length == 0)
return new ArrayList();
return new ArrayList(Arrays.asList(array));
}
public static T[] removeNulls(T[] array)
{
for (T t : array)
{
if (t == null)
{
List list = new ArrayList<>();
for (T t2 : array)
{
if (t2 != null)
list.add(t2);
}
return list.toArray(Arrays.copyOf(array, list.size()));
}
}
return array;
}
}