Java Collection Null nullSafe(Collection in)

Description

null Safe

License

Apache License

Declaration

@SuppressWarnings("unchecked")
    public static <T> Collection<T> nullSafe(Collection<T> in) 

Method Source Code

//package com.java2s;
/*//from  ww  w  .  j ava 2s. c om
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class Main {
    private static final List<Object> EMPTY_LIST = Collections.unmodifiableList(new ArrayList<Object>(0));

    @SuppressWarnings("unchecked")
    public static <T> Collection<T> nullSafe(Collection<T> in) {
        if (in == null) {
            return (Collection<T>) EMPTY_LIST;
        }
        return in;
    }
}

Related

1. isNull(Collection collection)
2. isNull(Collection collection)
3. isNull(Collection collection)
4. nullSafe(Collection collection)
5. nullSafe(Collection collection)
6. nullSafeCollection(Collection source)
7. nullSafeSize(Collection collection)
8. nullSafeSize(final Collection collection)
9. padWithNulls(final Collection s1, final Collection s2)