infinispan.com.mchange.lang.ArrayUtils Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.7
*
* Copyright (C) 2014 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.lang;
/**
* @deprecated use com.mchange.v1.util.ArrayUtils
* @author swaldman
*
*/
public final class ArrayUtils
{
/**
* The array may contain nulls, but o
* must be non-null.
*/
public static int indexOf(Object[] array, Object o)
{
for (int i = 0, len = array.length; i < len; ++i)
if (o.equals(array[i])) return i;
return -1;
}
public static int identityIndexOf(Object[] array, Object o)
{
for (int i = 0, len = array.length; i < len; ++i)
if (o == array[i]) return i;
return -1;
}
/**
* finds a hash value which takes into account
* the value of all elements, such that two object
* arrays for which Arrays.equals(a1, a2) returns
* true will hashAll() to the same value
*/
public static int hashAll(Object[] array)
{
int out = 0;
for (int i = 0, len = array.length; i < len; ++i)
{
Object o = array[i];
if (o != null) out ^= o.hashCode();
}
return out;
}
public static int hashAll(int[] array)
{
int out = 0;
for (int i = 0, len = array.length; i < len; ++i)
out ^= array[i];
return out;
}
public static boolean startsWith( byte[] checkMe, byte[] maybePrefix )
{
int cm_len = checkMe.length;
int mp_len = maybePrefix.length;
if (cm_len < mp_len)
return false;
for (int i = 0; i < mp_len; ++i)
if (checkMe[i] != maybePrefix[i])
return false;
return true;
}
private ArrayUtils()
{}
}