Mega Code Archive
Set of utilities used to manipulate arrays
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/*
* Copyright (C) Jakub Neubauer, 2007
*
* This file is part of TaskBlocks
*
* TaskBlocks is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* TaskBlocks 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//package taskblocks.utils;
import java.lang.reflect.Array;
/**
* Set of utilities used to manipulate arrays.
*
* @author j.neubauer
* @since 11.1.2007
*/
public class ArrayUtils {
/**
* Creates new array of the same type as given array and adds specified member
* to the end of new array.
*
* @param array
* @param member
* @return new array with member appened
*/
public static Object[] addToArray(Object[] array, Object member) {
Object[] newArray = (Object[])Array.newInstance(array.getClass().getComponentType(), array.length + 1);
System.arraycopy(array, 0, newArray, 0, array.length);
newArray[array.length] = member;
return newArray;
}
/**
* Finds member in array and if finds it, creates the same array without this member.
*
* @param array
* @param member
* @return new array without member or the old array if member wasn't found
*/
public static Object[] removeFromArray(Object[] array, Object member) {
int i;
for(i = 0; i<array.length;i++) {
if(array[i] == member) {
break;
}
}
// if we found the listener, construct new arrray without it.
if(i < array.length) {
Object[] newArray = (Object[])Array.newInstance(array.getClass().getComponentType(), array.length - 1);
System.arraycopy(array, 0, newArray, 0, i);
System.arraycopy(array, i+1, newArray, i, array.length-i-1);
return newArray;
}
return array;
}
public static Object[] removeFromArray(Object[] array, int i) {
if(i < 0 || i >= array.length) {
throw new IndexOutOfBoundsException();
}
Object[] newArray = (Object[])Array.newInstance(array.getClass().getComponentType(), array.length - 1);
System.arraycopy(array, 0, newArray, 0, i);
System.arraycopy(array, i+1, newArray, i, array.length-i-1);
return newArray;
}
}
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