Java Collection Clear clearAndAddAll(final Collection where, final Collection fromWhere)

Description

clear And Add All

License

Apache License

Parameter

Parameter	Description
where	collection to clear and add to
fromWhere	what to add

Exception

Parameter	Description
NullPointerException	if <code>where</code> is empty

Declaration

public static <E> void clearAndAddAll(final Collection<? super E> where,
        final Collection<? extends E> fromWhere) throws NullPointerException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2015 xWic group (http://www.xwic.de)
 *
 * 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.//from w w w .  j a  v a 2 s.  c  o m
 *  
 *******************************************************************************/

import java.util.Collection;

import java.util.Map;

public class Main {
    /**
     * @param where collection to clear and add to
     * @param fromWhere what to add
     * @throws NullPointerException if <code>where</code> is empty
     */
    public static <E> void clearAndAddAll(final Collection<? super E> where,
            final Collection<? extends E> fromWhere) throws NullPointerException {
        if (where == fromWhere) {
            return;
        }
        where.clear();
        if (!isEmpty(fromWhere)) {
            where.addAll(fromWhere);
        }
    }

    /**
     * @param c
     * @return
     */
    public static boolean isEmpty(final Collection<?> c) {
        return c == null || c.isEmpty();
    }

    /**
     * @param c
     * @return
     */
    public static boolean isEmpty(final Map<?, ?> c) {
        return c == null || c.isEmpty();
    }
}

Related

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