Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2005-2014 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;
import java.util.Map;

public class Main {
    /**
     * This method joins two lists returning the a single list consisting of the first followed by the second.
     * 
     * @param first  first list. can be null.
     * @param second second list. can be null.
     * @return the concatenation of both lists. will not be null
     */
    public static <T> List<T> nullSafeAppend(List<T> first, List<T> second) {
        return nullSafeAppend(first, second, false);
    }

    /**
     * This method joins two lists returning the a single list consisting of the first followed by the second.
     * 
     * @param first  first list. can be null.
     * @param second second list. can be null.
     * @param emptyResultIsNull if the result is empty, should we return null?
     * @return the concatenation of both lists or null
     */
    public static <T> List<T> nullSafeAppend(List<T> first, List<T> second, boolean emptyResultIsNull) {
        List<T> result = new ArrayList<T>();

        if (first != null)
            result.addAll(first);
        if (second != null)
            result.addAll(second);

        if (result.isEmpty() && emptyResultIsNull) {
            result = null;
        }
        return result;
    }

    public static boolean isEmpty(Map<?, ?> map) {
        if (map == null) {
            return true;
        }
        return map.isEmpty();
    }

    public static boolean isEmpty(Collection<?> items) {
        if (items == null) {
            return true;
        }
        return items.isEmpty();
    }
}