001/*
002 * Copyright 2002-2019 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.format.datetime.standard;
018
019import java.text.ParseException;
020import java.time.Instant;
021import java.time.format.DateTimeFormatter;
022import java.util.Locale;
023
024import org.springframework.format.Formatter;
025
026/**
027 * {@link Formatter} implementation for a JSR-310 {@link java.time.Instant},
028 * following JSR-310's parsing rules for an Instant (that is, not using a
029 * configurable {@link java.time.format.DateTimeFormatter}): accepting the
030 * default {@code ISO_INSTANT} format as well as {@code RFC_1123_DATE_TIME}
031 * (which is commonly used for HTTP date header values), as of Spring 4.3.
032 *
033 * @author Juergen Hoeller
034 * @author Andrei Nevedomskii
035 * @since 4.0
036 * @see java.time.Instant#parse
037 * @see java.time.format.DateTimeFormatter#ISO_INSTANT
038 * @see java.time.format.DateTimeFormatter#RFC_1123_DATE_TIME
039 */
040public class InstantFormatter implements Formatter<Instant> {
041
042        @Override
043        public Instant parse(String text, Locale locale) throws ParseException {
044                if (text.length() > 0 && Character.isAlphabetic(text.charAt(0))) {
045                        // assuming RFC-1123 value a la "Tue, 3 Jun 2008 11:05:30 GMT"
046                        return Instant.from(DateTimeFormatter.RFC_1123_DATE_TIME.parse(text));
047                }
048                else {
049                        // assuming UTC instant a la "2007-12-03T10:15:30.00Z"
050                        return Instant.parse(text);
051                }
052        }
053
054        @Override
055        public String print(Instant object, Locale locale) {
056                return object.toString();
057        }
058
059}