ObjectUtils.java

/*
 * This file is part of FTB Launcher.
 *
 * Copyright © 2012-2016, FTB Launcher Contributors <https://github.com/Slowpoke101/FTBLaunch/>
 * FTB Launcher is licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.ftb.util;

import java.util.Arrays;

import lombok.NonNull;

public class ObjectUtils
{

	/**
	 *
	 * @param s - string to check
	 * @param backup -if string is null or empty this will be returned
	 * @return NonNull string
	 */
	public static String preventNullString (String s, @NonNull String backup)
	{
		if (s == null || s.isEmpty())
		{
			return backup;
		}
		return s;
	}

	/**
	 * @param first - First array
	 * @param rest - Rest of the arrays
	 * @return - Outputs concatenated arrays
	 */
	public static <T> T[] concatenateArrays (T[] first, T[]... rest)
	{
		int totalLength = first.length;
		for(T[] array : rest)
		{
			totalLength += array.length;
		}
		T[] result = Arrays.copyOf(first, totalLength);
		int offset = first.length;
		for(T[] array : rest)
		{
			System.arraycopy(array, 0, result, offset, array.length);
			offset += array.length;
		}
		return result;
	}
}