Java Collection Empty nullToEmpty(Collection coll)

License

Return

Declaration

public static <U> Collection<U> nullToEmpty(Collection<U> coll) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2007, 2014 Bruno Medeiros and other Contributors.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:/* w ww  .  j  a  v  a2s .com*/
 *     Bruno Medeiros - initial implementation
 *******************************************************************************/

import java.util.Collection;
import java.util.Collections;

public class Main {
    /** @return given coll if it's not null, or an empty immutable {@link Collection} otherwise. */
    public static <U> Collection<U> nullToEmpty(Collection<U> coll) {
        return coll == null ? Collections.EMPTY_LIST : coll;
    }

    /** @return given coll if it's not null, or an empty immutable {@link Iterable} otherwise. */
    public static <E> Iterable<E> nullToEmpty(Iterable<E> coll) {
        return coll == null ? Collections.EMPTY_LIST : coll;
    }
}

Related

1. nullOrEmpty(Collection tested)
2. nullOrEmpty(Collection c)
3. nullOrEmpty(final Collection in)
4. nullOrEmptyToDefault(final Collection collection, final Collection defaultValue)
5. nullToEmpty(Collection c)
6. orEmpty(T collection)
7. removeEmptyStrings(Collection data)
8. safeIsEmpty(Collection collection)