Java Collection First firstNonEmpty(Collection... collections)

Description

first Non Empty

License

Apache License

Declaration

public static <T> Collection<T> firstNonEmpty(Collection<T>... collections) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (C) 2014 The Calrissian Authors
 *
 * 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. ja  v a  2s .  co m*/
 *******************************************************************************/

import java.util.Collection;
import static java.util.Collections.emptySet;

public class Main {
    public static <T> Collection<T> firstNonEmpty(Collection<T>... collections) {
        for (Collection<T> collection : collections)
            if (!isEmpty(collection))
                return collection;

        return emptySet();
    }

    public static <T> boolean isEmpty(T[] items) {
        return items == null || items.length == 0;
    }

    public static <T> boolean isEmpty(Collection<T> items) {
        return items == null || items.isEmpty();
    }

    public static boolean isEmpty(String value) {
        return value == null || value.isEmpty();
    }
}

Related

1. firstElement(Collection c)
2. firstElementOf(final Collection collection)
3. firstElementOf(final Collection items)
4. firstFrom(Collection collection)
5. firstFrom(Collection coll)
6. firstNonNull(Collection collection)
7. firstOrThat(Collection collection, T that)
8. firstValue(Class type, Collection values)
9. GET_FIRST_ELEMENT(Collection coll)