001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau; 014 015import java.util.*; 016 017/** 018 * Identifies how to add elements to a list. 019 */ 020public enum AddFlag { 021 022 /** 023 * Any previous value(s) should be overwritten/replaced. 024 */ 025 APPEND, 026 027 /** 028 * Any previous value(s) should be overwritten/replaced. 029 */ 030 PREPEND, 031 032 /** 033 * Any previous value(s) should be overwritten/replaced. 034 */ 035 REPLACE, 036 037 /** 038 * Don't add the value if it's <jk>null</jk> or an empty string. 039 */ 040 SKIP_IF_EMPTY; 041 042 /** 043 * Default flags. 044 */ 045 public static final EnumSet<AddFlag> DEFAULT_FLAGS = EnumSet.of(APPEND); 046 047 /** 048 * Default skip-if-empty flags. 049 */ 050 public static final EnumSet<AddFlag> SKIP_IF_EMPTY_FLAGS = EnumSet.of(APPEND, SKIP_IF_EMPTY); 051 052 /** 053 * Returns {@link #DEFAULT_FLAGS} if the enum set is <jk>null</jk> or empty. 054 * 055 * @param s The set to check. 056 * @return Either the same set or {@link #DEFAULT_FLAGS}. Never <jk>null</jk>. 057 */ 058 public static EnumSet<AddFlag> orDefault(EnumSet<AddFlag> s) { 059 return s == null || s.isEmpty() ? DEFAULT_FLAGS : s; 060 } 061}