Initializer.java

/* Copyright 2002-2026 CS GROUP
 * Licensed to CS GROUP (CS) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * CS 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.
 */
package org.orekit.files.ccsds.utils;

import java.util.Collections;
import java.util.List;

/**
 * Utility class used to initialize static fields.
 * @since 14.0
 */
public final class Initializer {

    private Initializer() {
    }

    /**
     * Return an empty list if the input is null.
     * @param input input list
     * @param <T> type of the list
     * @return an empty list if the input is null, the input otherwise
     */
    public static <T> List<T> emptyListIfNull(final List<T> input) {
        return input == null ? Collections.emptyList() : input;
    }
}