jena-db/jena-tdb2/src/main/java/org/apache/jena/tdb2/sys/Util.java

/*
 * 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.
 */

package org.apache.jena.tdb2.sys;

import java.util.List;
import java.util.NoSuchElementException;

/** Utility code that should go somewhere */
public class Util {

    /** Get the last element of a list, or throw NoSuchElementException
     * @param list
     * @return T
     * @throws NoSuchElementException
     */
    public static <T> T xgetLast(List<T> list) {
        T elt = getLastOrNull(list);
        if ( elt == null )
            throw new NoSuchElementException();
        return elt;
    }

    /**
     * Get the last element of a list, or return null.
     * @param list
     * @return T
     */
    public static <T> T getLastOrNull(List<T> list) {
        if ( list.isEmpty() )
            return null;
        return list.get(list.size()-1);
    }
}