001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.csv;
019
020/**
021 * Determines how duplicate header fields should be handled
022 * if {@link CSVFormat.Builder#setHeader(Class)} is not null.
023 *
024 * @since 1.10.0
025 */
026public enum DuplicateHeaderMode {
027
028    /**
029     * Allows all duplicate headers.
030     */
031    ALLOW_ALL,
032
033    /**
034     * Allows duplicate headers only if they're empty, blank, or null strings.
035     */
036    ALLOW_EMPTY,
037
038    /**
039     * Disallows duplicate headers entirely.
040     */
041    DISALLOW
042}