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 */ 017package org.apache.wicket.util.convert.converter; 018 019import java.time.format.DateTimeFormatter; 020import java.time.format.DateTimeParseException; 021import java.time.temporal.Temporal; 022import java.time.temporal.TemporalAccessor; 023import java.util.Locale; 024 025import org.apache.wicket.util.string.Strings; 026 027/** 028 * A base class for all java.time.** related converters 029 * 030 * @param <T> 031 * the type of the Temporal that is supported by this converter 032 */ 033public abstract class AbstractJavaTimeConverter<T extends Temporal> extends AbstractConverter<T> 034{ 035 private static final long serialVersionUID = 1L; 036 037 /** 038 * Creates a new instance of D out of the passed date(time) as long 039 * @param temporalAccessor 040 * the date(time) in millis since Epoch 041 * @return a new instance of the specific type D 042 */ 043 protected abstract T createTemporal(TemporalAccessor temporalAccessor); 044 045 @Override 046 public T convertToObject(final String value, Locale locale) 047 { 048 if (Strings.isEmpty(value)) 049 { 050 return null; 051 } 052 053 DateTimeFormatter dateTimeFormatter = getDateTimeFormatter(locale); 054 055 TemporalAccessor temporalAccessor; 056 try { 057 temporalAccessor = dateTimeFormatter.parse(value); 058 } catch (DateTimeParseException ex) { 059 throw newConversionException("Cannot parse '" + value, value, locale); 060 } 061 062 return createTemporal(temporalAccessor); 063 } 064 065 @Override 066 public String convertToString(final T value, final Locale locale) 067 { 068 if (value == null) 069 { 070 return null; 071 } 072 073 final DateTimeFormatter dateTimeFormatter = getDateTimeFormatter(locale); 074 if (dateTimeFormatter != null) 075 { 076 return dateTimeFormatter.format(value); 077 } 078 return value.toString(); 079 } 080 081 /** 082 * @param locale 083 * @return Returns the date time format. 084 */ 085 public DateTimeFormatter getDateTimeFormatter(Locale locale) 086 { 087 if (locale == null) 088 { 089 locale = Locale.getDefault(); 090 } 091 092 return getDateTimeFormatter().withLocale(locale); 093 } 094 095 protected abstract DateTimeFormatter getDateTimeFormatter(); 096}