1 /* 2 * ==================================================================== 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * ==================================================================== 20 * 21 * This software consists of voluntary contributions made by many 22 * individuals on behalf of the Apache Software Foundation. For more 23 * information on the Apache Software Foundation, please see 24 * <http://www.apache.org/>. 25 * 26 */ 27 package org.apache.hc.client5.http.impl.cache; 28 29 import java.time.Instant; 30 31 import org.apache.hc.client5.http.utils.DateUtils; 32 import org.apache.hc.core5.annotation.Internal; 33 import org.apache.hc.core5.http.Header; 34 import org.apache.hc.core5.http.MessageHeaders; 35 36 /** 37 * HTTP cache date support utilities. 38 * 39 * @since 5.2 40 */ 41 @Internal 42 public final class DateSupport { 43 44 /** 45 * Tests if the first message is after (newer) than second one 46 * using the given message header for comparison. 47 * 48 * @param message1 the first message 49 * @param message2 the second message 50 * @param headerName header name 51 * 52 * @return {@code true} if both messages contain a header with the given name 53 * and the value of the header from the first message is newer that of 54 * the second message. 55 * 56 * @since 5.0 57 */ 58 public static boolean isAfter( 59 final MessageHeaders message1, 60 final MessageHeaders message2, 61 final String headerName) { 62 if (message1 != null && message2 != null) { 63 final Header dateHeader1 = message1.getFirstHeader(headerName); 64 if (dateHeader1 != null) { 65 final Header dateHeader2 = message2.getFirstHeader(headerName); 66 if (dateHeader2 != null) { 67 final Instant date1 = DateUtils.parseStandardDate(dateHeader1.getValue()); 68 if (date1 != null) { 69 final Instant date2 = DateUtils.parseStandardDate(dateHeader2.getValue()); 70 if (date2 != null) { 71 return date1.isAfter(date2); 72 } 73 } 74 } 75 } 76 } 77 return false; 78 } 79 80 /** 81 * Tests if the first message is before (older) than the second one 82 * using the given message header for comparison. 83 * 84 * @param message1 the first message 85 * @param message2 the second message 86 * @param headerName header name 87 * 88 * @return {@code true} if both messages contain a header with the given name 89 * and the value of the header from the first message is older that of 90 * the second message. 91 * 92 * @since 5.0 93 */ 94 public static boolean isBefore( 95 final MessageHeaders message1, 96 final MessageHeaders message2, 97 final String headerName) { 98 if (message1 != null && message2 != null) { 99 final Header dateHeader1 = message1.getFirstHeader(headerName); 100 if (dateHeader1 != null) { 101 final Header dateHeader2 = message2.getFirstHeader(headerName); 102 if (dateHeader2 != null) { 103 final Instant date1 = DateUtils.parseStandardDate(dateHeader1.getValue()); 104 if (date1 != null) { 105 final Instant date2 = DateUtils.parseStandardDate(dateHeader2.getValue()); 106 if (date2 != null) { 107 return date1.isBefore(date2); 108 } 109 } 110 } 111 } 112 } 113 return false; 114 } 115 116 }