Java Collection Clear clear(final Collection collection)

Description

clear

License

Open Source License

Declaration

public static void clear(final Collection<?> collection) 

Method Source Code

//package com.java2s;
/*// w w w.  j  a v  a2s.c o  m
 * Copyright (C) 2013 Marcius da Silva da Fonseca.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

import java.util.Collection;

import java.util.Map;

public class Main {
    public static void clear(final Collection<?> collection) {
        if (isNotEmpty(collection)) {
            collection.clear();
        }
    }

    public static void clear(final Map<?, ?> map) {
        if (isNotEmpty(map)) {
            map.clear();
        }
    }

    /**
     * Tells if a given collection is not null and has something.
     *
     * @param collection The collection to be evaluated.
     * @return {@code true} if the given map is not null and has something.
     */
    public static boolean isNotEmpty(final Collection<?> collection) {
        return !isEmptyOrNull(collection);
    }

    /**
     * Tells if a given map is not null and has something.
     *
     * @param map The map to be evaluated.
     * @return {@code true} if the given map is not null and has something.
     */
    public static boolean isNotEmpty(final Map<?, ?> map) {
        return !isEmptyOrNull(map);
    }

    /**
     * Tells if a given collection is null or empty.
     *
     * @param collection The collection to be evaluated.
     * @return {@code true} if the given collection is null or empty.
     */
    public static boolean isEmptyOrNull(final Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    /**
     * Tells if a given map is null or empty.
     *
     * @param map The map to be evaluated.
     * @return {@code true} if the given map is null or empty.
     */
    public static boolean isEmptyOrNull(final Map<?, ?> map) {
        return map == null || map.isEmpty();
    }
}

Related

1. cleanup(AnyCollection collection)
2. clear(Collection collection)
3. clear(Collection collection)
4. clear(Collection collection)
5. clearAndAddAll(final Collection where, final Collection fromWhere)
6. clearCollection(Collection collection)