com.univocity.parsers.conversions.CalendarConversion Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright 2014 uniVocity Software Pty Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.univocity.parsers.conversions;
import java.util.*;
import com.univocity.parsers.common.*;
/**
* Converts Strings to instances of {@link java.util.Calendar} and vice versa.
*
* This class supports multiple date formats. For example, you can define conversions from dates represented by different Strings such as "2001/05/02 and Dec/2013".
*
*
The reverse conversion from a Calendar to String (in {@link CalendarConversion#revert(Calendar)} will return a formatted String using the date pattern provided in this class constructor
*
The date patterns must follows the pattern rules of {@link java.text.SimpleDateFormat}
*
* @see java.text.SimpleDateFormat
*
* @author uniVocity Software Pty Ltd - [email protected]
*
*/
public class CalendarConversion extends ObjectConversion {
private final DateConversion dateConversion;
/**
* Defines a conversion from String to {@link java.util.Calendar} using a sequence of acceptable date patterns.
* This constructor assumes the output of a conversion should be null when input is null
* @param valueIfStringIsNull default Calendar value to be returned when the input String is null. Used when {@link ObjectConversion#execute(String)} is invoked.
* @param valueIfObjectIsNull default String value to be returned when a Calendar input is null. Used when {@link CalendarConversion#revert(Calendar)} is invoked.
* @param dateFormats list of acceptable date patterns The first pattern in this sequence will be used to convert a Calendar into a String in {@link CalendarConversion#revert(Calendar)}.
*/
public CalendarConversion(Calendar valueIfStringIsNull, String valueIfObjectIsNull, String... dateFormats) {
super(valueIfStringIsNull, valueIfObjectIsNull);
ArgumentUtils.noNulls("Date formats", dateFormats);
dateConversion = new DateConversion(dateFormats);
}
/**
* Defines a conversion from String to {@link java.util.Calendar} using a sequence of acceptable date patterns.
* This constructor assumes the output of a conversion should be null when input is null
* @param dateFormats list of acceptable date patterns The first pattern in this sequence will be used to convert a Calendar into a String in {@link CalendarConversion#revert(Calendar)}.
*/
public CalendarConversion(String... dateFormats) {
this(null, null, dateFormats);
}
/**
* Converts Calendar to a formatted date String.
* The pattern used to generate the formatted date is the first date pattern provided in the constructor of this class
* @param input the Calendar to be converted to a String
* @return a formatted date String representing the date provided by the given Calendar, or the value of {@link CalendarConversion#getValueIfObjectIsNull()} if the Calendar parameter is null.
*/
@Override
public String revert(Calendar input) {
if (input == null) {
return super.revert(input);
}
return dateConversion.revert(input.getTime());
}
/**
* Converts a formatted date String to an instance of Calendar.
*
The pattern in the formatted date must match one of the date patterns provided in the constructor of this class.
* @param input the String containing a formatted date which must be converted to a Calendar
* @return the Calendar instance containing the date information represented by the given String, or the value of {@link CalendarConversion#getValueIfStringIsNull()} if the String input is null.
*/
@Override
protected Calendar fromString(String input) {
Date date = dateConversion.execute(input);
Calendar out = Calendar.getInstance();
out.setTime(date);
return out;
}
}