org.supercsv.cellprocessor.FmtDate Maven / Gradle / Ivy
/*
* Copyright 2007 Kasper B. Graversen
*
* 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 org.supercsv.cellprocessor;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.supercsv.cellprocessor.ift.DateCellProcessor;
import org.supercsv.cellprocessor.ift.StringCellProcessor;
import org.supercsv.exception.SuperCsvCellProcessorException;
import org.supercsv.util.CsvContext;
/**
* Converts a date into a formatted string using the {@link SimpleDateFormat} class. If you want to convert from a
* String to a Date, use the {@link ParseDate} processor.
*
* Some example date formats you can use are:
* "dd/MM/yyyy" (formats a date as "25/12/2011")
* "dd-MMM-yy" (formats a date as "25-Dec-11")
* "yyyy.MM.dd.HH.mm.ss" (formats a date as "2011.12.25.08.36.33"
* "E, dd MMM yyyy HH:mm:ss Z" (formats a date as "Tue, 25 Dec 2011 08:36:33 -0500")
*
* @since 1.50
* @author Dominique De Vito
* @author James Bassett
*/
public class FmtDate extends CellProcessorAdaptor implements DateCellProcessor {
private final String dateFormat;
/**
* Constructs a new FmtDate processor, which converts a date into a formatted string using
* SimpleDateFormat.
*
* @param dateFormat
* the date format String (see {@link SimpleDateFormat})
* @throws NullPointerException
* if dateFormat is null
*/
public FmtDate(final String dateFormat) {
super();
checkPreconditions(dateFormat);
this.dateFormat = dateFormat;
}
/**
* Constructs a new FmtDate processor, which converts a date into a formatted string using
* SimpleDateFormat, then calls the next processor in the chain.
*
* @param dateFormat
* the date format String (see {@link SimpleDateFormat})
* @param next
* the next processor in the chain
* @throws NullPointerException
* if dateFormat or next is null
*/
public FmtDate(final String dateFormat, final StringCellProcessor next) {
super(next);
checkPreconditions(dateFormat);
this.dateFormat = dateFormat;
}
/**
* Checks the preconditions for creating a new FmtDate processor.
*
* @param dateFormat
* the date format String
* @throws NullPointerException
* if dateFormat is null
*/
private static void checkPreconditions(final String dateFormat) {
if( dateFormat == null ) {
throw new NullPointerException("dateFormat should not be null");
}
}
/**
* {@inheritDoc}
*
* @throws SuperCsvCellProcessorException
* if value is null or is not a Date, or if dateFormat is not a valid date format
*/
public Object execute(final Object value, final CsvContext context) {
validateInputNotNull(value, context);
if( !(value instanceof Date) ) {
throw new SuperCsvCellProcessorException(Date.class, value, context, this);
}
final SimpleDateFormat formatter;
try {
formatter = new SimpleDateFormat(dateFormat);
}
catch(IllegalArgumentException e) {
throw new SuperCsvCellProcessorException(String.format("'%s' is not a valid date format", dateFormat),
context, this, e);
}
String result = formatter.format((Date) value);
return next.execute(result, context);
}
}